Patients who survived pediatric-onset cancer are at increased risk for developing or experiencing endocrine abnormalities.

Risk was significantly higher in survivors who underwent high-risk therapeutic exposures compared with survivors not so exposed. Moreover, the incidence and prevalence of endocrine abnormalities increased across the lifespan of survivors, reported Sogol Mostoufi-Moab, MD, of University of Pennsylvania, Philadelphia, and his associates (J Clin Oncol. 2016 Jul. doi: 10.1200/JCO.2016.66.6545).

A total of 14,290 patients met the study’s eligibility requirements, which included a diagnosis of cancer before age 21 years and 5-year survival following diagnosis. Cancer diagnoses included leukemia, Hodgkin and non-Hodgkin lymphoma, Wilms tumor, neuroblastoma, sarcoma, bone malignancy, and central nervous system malignancy. Baseline and follow-up questionnaires collected endocrine-related outcomes of interest, demographic information, and medical histories for both cancer survivors and their siblings (n = 4,031). For survivors, median age at diagnosis was 6 years and median age at last follow-up was 32 years. For siblings, median age at last follow-up was 34 years.

Overall 44% of cancer survivors had at least one endocrinopathy, 16.7% had at least two, and 6.6% had three or more. Survivors of Hodgkin lymphoma had the highest frequency of endocrine abnormality (60.1%) followed by survivors of CNS malignancy (54%), leukemia (45.6%), sarcoma (41.3%), non-Hodgkin lymphoma (39.7%), and neuroblastoma (31.9%).

Specifically, thyroid disorders were more frequent among cancer survivors than among their siblings: underactive thyroid (hazard ratio, 2.2; 95% confidence interval, 1.8-2.7), overactive thyroid (HR, 2.4; 95% CI, 1.7-3.3), thyroid nodules (HR, 3.9; 95% CI, 2.9-5.4), and thyroid cancer (HR 2.5; 95% CI, 1.2-5.3).

Compared to their siblings, cancer survivors showed increased risk of developing diabetes (RR, 1.8; 95% CI, 1.4-2.3).

Among survivors, those exposed to high-risk therapies (defined by the Children’s Oncology Group’s Long-Term Follow-Up Guidelinesfor Survivors of Childhood, Adolescent, and Young Adult Cancers) were at a greater risk of developing primary hypothyroidism (HR, 6.6; 95% CI, 5.6-7.8) central hypothyroidism (HR, 3.9; 95% CI, 2.9-5.2), an overactive thyroid (HR, 1.8; 95% CI, 1.2-2.8), thyroid nodules (HR, 6.3; 95% CI, 5.2-7.5), and thyroid cancer (HR, 9.2; 95% CI, 6.2-13.7) compared with survivors not so exposed.

The National Cancer Institute, the Cancer Center Support Grant, and the American Lebanese Syrian Associated Charities of St. Jude Children’s Research Hospital funded the study. Dr. Mostoufi-Moab and nine other investigators had no disclosures to report. Two investigators reported receiving financial compensation or honoraria from Merck or Sandoz.

[email protected]

On Twitter @jessnicolecraig

Patients who survived pediatric-onset cancer are at increased risk for developing or experiencing endocrine abnormalities.

Risk was significantly higher in survivors who underwent high-risk therapeutic exposures compared with survivors not so exposed. Moreover, the incidence and prevalence of endocrine abnormalities increased across the lifespan of survivors, reported Sogol Mostoufi-Moab, MD, of University of Pennsylvania, Philadelphia, and his associates (J Clin Oncol. 2016 Jul. doi: 10.1200/JCO.2016.66.6545).

A total of 14,290 patients met the study’s eligibility requirements, which included a diagnosis of cancer before age 21 years and 5-year survival following diagnosis. Cancer diagnoses included leukemia, Hodgkin and non-Hodgkin lymphoma, Wilms tumor, neuroblastoma, sarcoma, bone malignancy, and central nervous system malignancy. Baseline and follow-up questionnaires collected endocrine-related outcomes of interest, demographic information, and medical histories for both cancer survivors and their siblings (n = 4,031). For survivors, median age at diagnosis was 6 years and median age at last follow-up was 32 years. For siblings, median age at last follow-up was 34 years.

Overall 44% of cancer survivors had at least one endocrinopathy, 16.7% had at least two, and 6.6% had three or more. Survivors of Hodgkin lymphoma had the highest frequency of endocrine abnormality (60.1%) followed by survivors of CNS malignancy (54%), leukemia (45.6%), sarcoma (41.3%), non-Hodgkin lymphoma (39.7%), and neuroblastoma (31.9%).

Specifically, thyroid disorders were more frequent among cancer survivors than among their siblings: underactive thyroid (hazard ratio, 2.2; 95% confidence interval, 1.8-2.7), overactive thyroid (HR, 2.4; 95% CI, 1.7-3.3), thyroid nodules (HR, 3.9; 95% CI, 2.9-5.4), and thyroid cancer (HR 2.5; 95% CI, 1.2-5.3).

Compared to their siblings, cancer survivors showed increased risk of developing diabetes (RR, 1.8; 95% CI, 1.4-2.3).

Among survivors, those exposed to high-risk therapies (defined by the Children’s Oncology Group’s Long-Term Follow-Up Guidelinesfor Survivors of Childhood, Adolescent, and Young Adult Cancers) were at a greater risk of developing primary hypothyroidism (HR, 6.6; 95% CI, 5.6-7.8) central hypothyroidism (HR, 3.9; 95% CI, 2.9-5.2), an overactive thyroid (HR, 1.8; 95% CI, 1.2-2.8), thyroid nodules (HR, 6.3; 95% CI, 5.2-7.5), and thyroid cancer (HR, 9.2; 95% CI, 6.2-13.7) compared with survivors not so exposed.

The National Cancer Institute, the Cancer Center Support Grant, and the American Lebanese Syrian Associated Charities of St. Jude Children’s Research Hospital funded the study. Dr. Mostoufi-Moab and nine other investigators had no disclosures to report. Two investigators reported receiving financial compensation or honoraria from Merck or Sandoz.

[email protected]

On Twitter @jessnicolecraig

Patients who survived pediatric-onset cancer are at increased risk for developing or experiencing endocrine abnormalities.

Risk was significantly higher in survivors who underwent high-risk therapeutic exposures compared with survivors not so exposed. Moreover, the incidence and prevalence of endocrine abnormalities increased across the lifespan of survivors, reported Sogol Mostoufi-Moab, MD, of University of Pennsylvania, Philadelphia, and his associates (J Clin Oncol. 2016 Jul. doi: 10.1200/JCO.2016.66.6545).

A total of 14,290 patients met the study’s eligibility requirements, which included a diagnosis of cancer before age 21 years and 5-year survival following diagnosis. Cancer diagnoses included leukemia, Hodgkin and non-Hodgkin lymphoma, Wilms tumor, neuroblastoma, sarcoma, bone malignancy, and central nervous system malignancy. Baseline and follow-up questionnaires collected endocrine-related outcomes of interest, demographic information, and medical histories for both cancer survivors and their siblings (n = 4,031). For survivors, median age at diagnosis was 6 years and median age at last follow-up was 32 years. For siblings, median age at last follow-up was 34 years.

Overall 44% of cancer survivors had at least one endocrinopathy, 16.7% had at least two, and 6.6% had three or more. Survivors of Hodgkin lymphoma had the highest frequency of endocrine abnormality (60.1%) followed by survivors of CNS malignancy (54%), leukemia (45.6%), sarcoma (41.3%), non-Hodgkin lymphoma (39.7%), and neuroblastoma (31.9%).

Specifically, thyroid disorders were more frequent among cancer survivors than among their siblings: underactive thyroid (hazard ratio, 2.2; 95% confidence interval, 1.8-2.7), overactive thyroid (HR, 2.4; 95% CI, 1.7-3.3), thyroid nodules (HR, 3.9; 95% CI, 2.9-5.4), and thyroid cancer (HR 2.5; 95% CI, 1.2-5.3).

Compared to their siblings, cancer survivors showed increased risk of developing diabetes (RR, 1.8; 95% CI, 1.4-2.3).

Among survivors, those exposed to high-risk therapies (defined by the Children’s Oncology Group’s Long-Term Follow-Up Guidelinesfor Survivors of Childhood, Adolescent, and Young Adult Cancers) were at a greater risk of developing primary hypothyroidism (HR, 6.6; 95% CI, 5.6-7.8) central hypothyroidism (HR, 3.9; 95% CI, 2.9-5.2), an overactive thyroid (HR, 1.8; 95% CI, 1.2-2.8), thyroid nodules (HR, 6.3; 95% CI, 5.2-7.5), and thyroid cancer (HR, 9.2; 95% CI, 6.2-13.7) compared with survivors not so exposed.

The National Cancer Institute, the Cancer Center Support Grant, and the American Lebanese Syrian Associated Charities of St. Jude Children’s Research Hospital funded the study. Dr. Mostoufi-Moab and nine other investigators had no disclosures to report. Two investigators reported receiving financial compensation or honoraria from Merck or Sandoz.

[email protected]

On Twitter @jessnicolecraig

Emergency physicians (EPs) have traditionally used the landmark technique to block the radial, ulnar, and median nerves at the wrist (Figure 1). Many times, however, there is a need to perform the block more proximally. Performing these blocks with real-time ultrasound guidance allows the clinician to visually target the nerve, requires less anesthetic agent, and helps to avoid vascular structures. As with any procedure, employing the appropriate technique, along with practice, increases the success of the block.

Patient Selection

Before performing a nerve block, the EP must first determine if the patient is an appropriate candidate. The EP should be cautious in performing a nerve block on any patient who has paresthesias, tingling, or weakness, as the block will complicate further examinations. Likewise, a nerve block may be contraindicated in a patient in whom compartment syndrome is a concern, since the analgesic effect will inhibit the patient’s ability to sense increasing pain or worsening paresthesias.

Equipment and Preprocedure Care

An ultrasound-guided nerve block is performed using the linear high-frequency probe. Prior to the procedure, standard infection-control measures should be taken—ie, thoroughly cleaning the preinjection site and using a transducer-probe cover. Regarding the choice of anesthetic, either bupivacaine or lidocaine is appropriate; however, bupivacaine will provide a longer duration of analgesia. To administer the anesthetic, we typically use a regular cutting needle or a spinal needle. A review of the literature typically suggests either noncutting needle tips or tips with short bevels. There is a paucity of data on needle tip selection. The use of noncutting needle tips or tips with short bevels may be a better choice than a regular cutting needle or a spinal needle because they may decrease the chance of intraneural injection and consequent nerve injury.

Single- Versus Two-Person Technique

Peripheral nerve blocks can be performed using either a single- or two-person technique. In the one-person technique, the operator manipulates both the probe and the syringe. The two-person technique, however, requires the addition of tubing between the needle and the syringe. This can be done with the addition of a small section of intravenous (IV) tubing or by connecting two pieces of tubing together (the type traditionally placed on IV catheters). The operator holds the needle and the probe while the syringe and injection are controlled by the second person. Then, with the ultrasound machine set at the nerve or soft-tissue presetting, the scan begins by placing the probe in a transverse orientation.

Nerve Location and Identification

As previously noted, the ulnar, median, and radial nerves have traditionally been identified through use of the landmark technique just proximal to the wrist. The nerves can be located initially at these sites and then traced proximally.

Ulnar Nerve

The ulnar nerve is located on the ulnar side of the forearm, just proximal to the wrist. (Figure 2a and 2b). The clinician should begin by fanning the probe at the wrist to find the ulnar artery and locate the nerve bundle. The ulnar nerve is also located on the ulnar side of the ulnar artery. The nerve will diverge from the path of the artery as it is traced proximally. To decrease the chance of an arterial injection/injury, the clinician should administer a nerve block after separating these two structures.

Median Nerve

The clinician can employ the landmark approach to help find the nerve; then the scan should begin at the carpal tunnel. On ultrasound, the tendons in the carpal tunnel will appear similar to nerves (ie, round and hyperechoic) compared to surrounding muscle. As one continues to slide the probe up the forearm, the tendons will become muscles and a single hyperechoic structure will remain—the median nerve running in between the flexor digitorum superificialis and the flexor digitorum profundus (Figure 3a and 3b). Since there is no artery alongside the median nerve, it can be traced proximally; therefore, the procedure can be performed in any convenient location.

Radial Nerve

Of the three nerves, the radial nerve is the most challenging to visualize on ultrasound. There are two approaches to performing a radial nerve block. In the first approach, the radial nerve can be found just proximal to the wrist crease on the radial side of the radial artery (Figure 4a and 4b). This nerve is typically much smaller and harder to visualize at this level; it can be traced proximally and the block performed at this location. In the second approach, the radial nerve can be located 3 to 4 cm proximal to the elbow with the probe located anterolaterally (Figure 5a and 5b). In this location, the radial nerve lies between the brachialis and the brachioradialis muscles. In this approach, the nerve is much larger and easier to visualize.

Performing the Block

Prior to performing an anesthetic block at the ulnar, median, or radial nerve at the wrist, the clinician should first place the patient in a sitting or supine position with the appropriate elbow extended. When performing the block at the radial nerve above the elbow, the hand is typically placed in a resting position on the patient’s abdomen. When localizing the nerve, the angle of the transducer can vary the appearance of the nerve dramatically. To ensure the best possible view, the clinician should slowly “rock” the probe back and forth 10° to 20° in plane with the long axis of the arm, making sure the probe is placed as perpendicular as possible to the nerve. Once the nerve is identified, the clinician can follow it up and down the forearm with the probe to identify the best site to perform the block. In the optimal location, there should be a clear path that is as superficial as possible and avoids any vascular structures. We prefer using an in-plane technique to perform the nerve block to visualize the entire needle as it approaches the nerve. Once the site has been determined, the clinician should slowly inject 4 to 5 cc of anesthetic around the nerve, with the objective to partially surround the nerve. There is no need to completely surround the nerve, as doing so is not necessary to achieve a successful block. The clinician should stop immediately if the patient reports pain or if there is increased resistance, because this could indicate an intraneural injection.

Summary

Ultrasound-guided peripheral nerve blocks are an excellent option for providing regional anesthesia to lacerations and wounds that are too large for a local anesthetic. This technique can provide better analgesic relief, enhancing patient care.

Emergency physicians (EPs) have traditionally used the landmark technique to block the radial, ulnar, and median nerves at the wrist (Figure 1). Many times, however, there is a need to perform the block more proximally. Performing these blocks with real-time ultrasound guidance allows the clinician to visually target the nerve, requires less anesthetic agent, and helps to avoid vascular structures. As with any procedure, employing the appropriate technique, along with practice, increases the success of the block.

Patient Selection

Before performing a nerve block, the EP must first determine if the patient is an appropriate candidate. The EP should be cautious in performing a nerve block on any patient who has paresthesias, tingling, or weakness, as the block will complicate further examinations. Likewise, a nerve block may be contraindicated in a patient in whom compartment syndrome is a concern, since the analgesic effect will inhibit the patient’s ability to sense increasing pain or worsening paresthesias.

Equipment and Preprocedure Care

An ultrasound-guided nerve block is performed using the linear high-frequency probe. Prior to the procedure, standard infection-control measures should be taken—ie, thoroughly cleaning the preinjection site and using a transducer-probe cover. Regarding the choice of anesthetic, either bupivacaine or lidocaine is appropriate; however, bupivacaine will provide a longer duration of analgesia. To administer the anesthetic, we typically use a regular cutting needle or a spinal needle. A review of the literature typically suggests either noncutting needle tips or tips with short bevels. There is a paucity of data on needle tip selection. The use of noncutting needle tips or tips with short bevels may be a better choice than a regular cutting needle or a spinal needle because they may decrease the chance of intraneural injection and consequent nerve injury.

Single- Versus Two-Person Technique

Peripheral nerve blocks can be performed using either a single- or two-person technique. In the one-person technique, the operator manipulates both the probe and the syringe. The two-person technique, however, requires the addition of tubing between the needle and the syringe. This can be done with the addition of a small section of intravenous (IV) tubing or by connecting two pieces of tubing together (the type traditionally placed on IV catheters). The operator holds the needle and the probe while the syringe and injection are controlled by the second person. Then, with the ultrasound machine set at the nerve or soft-tissue presetting, the scan begins by placing the probe in a transverse orientation.

Nerve Location and Identification

As previously noted, the ulnar, median, and radial nerves have traditionally been identified through use of the landmark technique just proximal to the wrist. The nerves can be located initially at these sites and then traced proximally.

Ulnar Nerve

The ulnar nerve is located on the ulnar side of the forearm, just proximal to the wrist. (Figure 2a and 2b). The clinician should begin by fanning the probe at the wrist to find the ulnar artery and locate the nerve bundle. The ulnar nerve is also located on the ulnar side of the ulnar artery. The nerve will diverge from the path of the artery as it is traced proximally. To decrease the chance of an arterial injection/injury, the clinician should administer a nerve block after separating these two structures.

Median Nerve

The clinician can employ the landmark approach to help find the nerve; then the scan should begin at the carpal tunnel. On ultrasound, the tendons in the carpal tunnel will appear similar to nerves (ie, round and hyperechoic) compared to surrounding muscle. As one continues to slide the probe up the forearm, the tendons will become muscles and a single hyperechoic structure will remain—the median nerve running in between the flexor digitorum superificialis and the flexor digitorum profundus (Figure 3a and 3b). Since there is no artery alongside the median nerve, it can be traced proximally; therefore, the procedure can be performed in any convenient location.

Radial Nerve

Of the three nerves, the radial nerve is the most challenging to visualize on ultrasound. There are two approaches to performing a radial nerve block. In the first approach, the radial nerve can be found just proximal to the wrist crease on the radial side of the radial artery (Figure 4a and 4b). This nerve is typically much smaller and harder to visualize at this level; it can be traced proximally and the block performed at this location. In the second approach, the radial nerve can be located 3 to 4 cm proximal to the elbow with the probe located anterolaterally (Figure 5a and 5b). In this location, the radial nerve lies between the brachialis and the brachioradialis muscles. In this approach, the nerve is much larger and easier to visualize.

Performing the Block

Prior to performing an anesthetic block at the ulnar, median, or radial nerve at the wrist, the clinician should first place the patient in a sitting or supine position with the appropriate elbow extended. When performing the block at the radial nerve above the elbow, the hand is typically placed in a resting position on the patient’s abdomen. When localizing the nerve, the angle of the transducer can vary the appearance of the nerve dramatically. To ensure the best possible view, the clinician should slowly “rock” the probe back and forth 10° to 20° in plane with the long axis of the arm, making sure the probe is placed as perpendicular as possible to the nerve. Once the nerve is identified, the clinician can follow it up and down the forearm with the probe to identify the best site to perform the block. In the optimal location, there should be a clear path that is as superficial as possible and avoids any vascular structures. We prefer using an in-plane technique to perform the nerve block to visualize the entire needle as it approaches the nerve. Once the site has been determined, the clinician should slowly inject 4 to 5 cc of anesthetic around the nerve, with the objective to partially surround the nerve. There is no need to completely surround the nerve, as doing so is not necessary to achieve a successful block. The clinician should stop immediately if the patient reports pain or if there is increased resistance, because this could indicate an intraneural injection.

Summary

Ultrasound-guided peripheral nerve blocks are an excellent option for providing regional anesthesia to lacerations and wounds that are too large for a local anesthetic. This technique can provide better analgesic relief, enhancing patient care.

Emergency physicians (EPs) have traditionally used the landmark technique to block the radial, ulnar, and median nerves at the wrist (Figure 1). Many times, however, there is a need to perform the block more proximally. Performing these blocks with real-time ultrasound guidance allows the clinician to visually target the nerve, requires less anesthetic agent, and helps to avoid vascular structures. As with any procedure, employing the appropriate technique, along with practice, increases the success of the block.

Patient Selection

Before performing a nerve block, the EP must first determine if the patient is an appropriate candidate. The EP should be cautious in performing a nerve block on any patient who has paresthesias, tingling, or weakness, as the block will complicate further examinations. Likewise, a nerve block may be contraindicated in a patient in whom compartment syndrome is a concern, since the analgesic effect will inhibit the patient’s ability to sense increasing pain or worsening paresthesias.

Equipment and Preprocedure Care

An ultrasound-guided nerve block is performed using the linear high-frequency probe. Prior to the procedure, standard infection-control measures should be taken—ie, thoroughly cleaning the preinjection site and using a transducer-probe cover. Regarding the choice of anesthetic, either bupivacaine or lidocaine is appropriate; however, bupivacaine will provide a longer duration of analgesia. To administer the anesthetic, we typically use a regular cutting needle or a spinal needle. A review of the literature typically suggests either noncutting needle tips or tips with short bevels. There is a paucity of data on needle tip selection. The use of noncutting needle tips or tips with short bevels may be a better choice than a regular cutting needle or a spinal needle because they may decrease the chance of intraneural injection and consequent nerve injury.

Single- Versus Two-Person Technique

Peripheral nerve blocks can be performed using either a single- or two-person technique. In the one-person technique, the operator manipulates both the probe and the syringe. The two-person technique, however, requires the addition of tubing between the needle and the syringe. This can be done with the addition of a small section of intravenous (IV) tubing or by connecting two pieces of tubing together (the type traditionally placed on IV catheters). The operator holds the needle and the probe while the syringe and injection are controlled by the second person. Then, with the ultrasound machine set at the nerve or soft-tissue presetting, the scan begins by placing the probe in a transverse orientation.

Nerve Location and Identification

As previously noted, the ulnar, median, and radial nerves have traditionally been identified through use of the landmark technique just proximal to the wrist. The nerves can be located initially at these sites and then traced proximally.

Ulnar Nerve

The ulnar nerve is located on the ulnar side of the forearm, just proximal to the wrist. (Figure 2a and 2b). The clinician should begin by fanning the probe at the wrist to find the ulnar artery and locate the nerve bundle. The ulnar nerve is also located on the ulnar side of the ulnar artery. The nerve will diverge from the path of the artery as it is traced proximally. To decrease the chance of an arterial injection/injury, the clinician should administer a nerve block after separating these two structures.

Median Nerve

The clinician can employ the landmark approach to help find the nerve; then the scan should begin at the carpal tunnel. On ultrasound, the tendons in the carpal tunnel will appear similar to nerves (ie, round and hyperechoic) compared to surrounding muscle. As one continues to slide the probe up the forearm, the tendons will become muscles and a single hyperechoic structure will remain—the median nerve running in between the flexor digitorum superificialis and the flexor digitorum profundus (Figure 3a and 3b). Since there is no artery alongside the median nerve, it can be traced proximally; therefore, the procedure can be performed in any convenient location.

Radial Nerve

Of the three nerves, the radial nerve is the most challenging to visualize on ultrasound. There are two approaches to performing a radial nerve block. In the first approach, the radial nerve can be found just proximal to the wrist crease on the radial side of the radial artery (Figure 4a and 4b). This nerve is typically much smaller and harder to visualize at this level; it can be traced proximally and the block performed at this location. In the second approach, the radial nerve can be located 3 to 4 cm proximal to the elbow with the probe located anterolaterally (Figure 5a and 5b). In this location, the radial nerve lies between the brachialis and the brachioradialis muscles. In this approach, the nerve is much larger and easier to visualize.

Performing the Block

Prior to performing an anesthetic block at the ulnar, median, or radial nerve at the wrist, the clinician should first place the patient in a sitting or supine position with the appropriate elbow extended. When performing the block at the radial nerve above the elbow, the hand is typically placed in a resting position on the patient’s abdomen. When localizing the nerve, the angle of the transducer can vary the appearance of the nerve dramatically. To ensure the best possible view, the clinician should slowly “rock” the probe back and forth 10° to 20° in plane with the long axis of the arm, making sure the probe is placed as perpendicular as possible to the nerve. Once the nerve is identified, the clinician can follow it up and down the forearm with the probe to identify the best site to perform the block. In the optimal location, there should be a clear path that is as superficial as possible and avoids any vascular structures. We prefer using an in-plane technique to perform the nerve block to visualize the entire needle as it approaches the nerve. Once the site has been determined, the clinician should slowly inject 4 to 5 cc of anesthetic around the nerve, with the objective to partially surround the nerve. There is no need to completely surround the nerve, as doing so is not necessary to achieve a successful block. The clinician should stop immediately if the patient reports pain or if there is increased resistance, because this could indicate an intraneural injection.

Summary

Ultrasound-guided peripheral nerve blocks are an excellent option for providing regional anesthesia to lacerations and wounds that are too large for a local anesthetic. This technique can provide better analgesic relief, enhancing patient care.

Case Scenarios

Case 1

While working abroad in a resource-limited environment, a patient was brought in after falling and hitting his head. Initially, the patient was awake and alert, but he gradually became minimally responsive, with a Glasgow Coma Scale score of 9. Your facility did not have computed tomography (CT) or magnetic resonance imaging (MRI), but did have a point-of-care ultrasound (US) machine. You measured the patient’s optic nerve sheath diameter (ONSD) with the US and found a diameter of 4.5 mm in each eye. With this clinical change, you wondered if repeat US scans to detect increasing intracranial pressure (ICP) would represent changes in the patient’s condition.

Case 2

A patient who presented with an intracranial hemorrhage was treated with hypertonic saline and was awaiting neurosurgical placement of an extraventicular drain. During this time, a resident who was on a US rotation asked you if she would be able to detect changes in the patient’s ICP using US rather than placing an invasive device. How do you respond?

In adults, ICP is normally 10 to 15 mm Hg. It may be pathologically increased in several life-threatening conditions, including traumatic brain injury (TBI), subarachnoid hemorrhage, central venous thrombosis, brain tumor, and abscess. It is also increased by nonacute pathology, such as idiopathic intracranial hypertension (IIH), which also is known as pseudotumor cerebri. In patients with acute pathology, ICP above 20 mm Hg is generally considered an indication for treatment.¹ Indications for ICP monitoring in TBI include positive CT findings, patient age greater than 40 years, systemic hypotension, or abnormal flexion/extension in response to pain.² Other reasons to monitor ICP include the management of pseudotumor cerebri or after ventriculoperitoneal shunt surgery.³

Unfortunately, current methods of ICP monitoring have significant drawbacks and limitations. The gold standard of ICP monitoring—measurement using an intraventricular catheter—increases the risks of infection and hemorrhage, requires the skill of a neurosurgeon, and may be contraindicated due to coagulopathy or thrombocytopenia. It also cannot be done in a prehospital setting and only to a limited extent in the ED.⁴

Computed tomography scans and MRI can assess elevated ICP, but these tests are expensive, may increase patient radiation exposure, require patient transport, and may not always detect raised ICP. In the appropriate clinical context, signs present on physical examination, such as decorticate/decerebrate posturing, papilledema, or fixed/dilated pupils, may be highly suggestive of an increased ICP, but sensitivity and specificity are inadequate. Delay in diagnosis is also a drawback of imaging and physical examination, as findings may not present until ICP has been persistently elevated.

Given the disadvantages of current means of assessing elevated ICP, several noninvasive methods of measuring ICP are being investigated. These include such techniques as transcranial Doppler, electroencephalogram, pupillometry, and ONSD measurements.⁵ This article reviews current applications of ultrasonography measurements of the ONSD in assessing elevations in ICP.

ONSD US

Assessment of ICP via measurement of the ONSD has attracted increasing attention, particularly in emergency medicine. Measurements of the ONSD are possible with CT, MRI, and US. Of these modalities, ONSD US has attracted the most interest, due to its low cost, wide availability, and rapidity. It does not require patient transport, and does not expose a patient to additional radiation. In addition, ONSD US has been utilized in low-resource settings, and may be particularly useful in prehospital and mass-casualty situations.⁶

The underlying relationship between ONSD and ICP is a result of the enclosure of the subarachnoid space by the ONS. Increased ICP leads to expansion of the ONS, particularly at 3 mm behind the globe, in the retrobulbar compartment (Figures 1 and 2).⁷

Unfortunately, it is not possible to precisely determine ICP from an ONSD measurement, because baseline ONSD values and elasticity vary significantly within the population.^4,8 As a result, ONSD US has been investigated mostly for its ability to detect qualitative changes—particularly as a screen for elevated ICP. Optic nerve sheath diameter has high discriminative value in its ability to distinguish normal from elevated ICP. In a meta-analysis, Dubourg et al⁹ showed that the technique had an area under the summary receiver-operating curve of 0.94, signifying excellent test accuracy to diagnose elevated ICPs.

Researchers have attempted to determine a threshold value of ONSD that would serve as a clinically useful predictor of elevated ICP. Currently, this value ranges from 4.8 to 5.9 mm, depending on the study⁹; 5 mm is commonly used clinically as a threshold.¹⁰

Using ONSD US to Monitor Rapid Changes in ICP

While the use of the ONSD technique to screen for elevated ICP is relatively well established, the use of ONSD US to track acute changes in ICP is not as well studied. Serial tracking of acute changes could be useful in a patient at risk for intracranial hypertension secondary to trauma, to monitor the results of treating a patient with IIH, or after ventriculoperitoneal shunt placement.³

In Vivo Data

In 1993, Tamburrelli et al¹¹ performed the first ONSD intrathecal infusion study, using A-scan sonography, and concluded that there was a “direct, biphasic, positive relation between diastolic intracranial pressure and optic nerve diameters” and that the data showed “rapid changes of optic nerve diameters in response to variation of intracranial pressure.”

In 1997, Hansen and Helmke¹² recorded ONSD versus ICP data in the first intrathecal infusion test to use B-scan mode sonography. Ultrasonography was performed at 2- to 4-minute intervals. Their data demonstrated a linear relationship between ICP and ONSD over a particular cerebrospinal fluid pressure interval. They noted that “this interval differed between patients: ONS dilation commenced at pressure thresholds between 15 mm Hg and 30 mm Hg and in some patients saturation of the response (constant ONSD) occurred between 30 mm Hg and 40 mm Hg.”

The slope of ONSD versus ICP curve varied considerably by patient, making it impossible to infer an absolute ICP value from an ONSD without prior knowledge of the patient’s ratio. Similar to the data from Tamburrelli et al,¹¹ Hansen and Helmke¹² also found that there was no lag in ONSD response to ICP: “Within this interval, no temporal delay of the ONS response was noted.”

The only study comparing real-time ONSD data to gold-standard measurements of rapidly changing ICP in humans was performed by Maissan et al¹³ in 2015. This study involved a cohort of 18 patients who had suffered TBI and had intraparenchymal probes inserted. Because ICP rises transiently during endotracheal tube suctioning due to irritation of the trachea, the increase and subsequent decrease after suctioning was an ideal time to perform ONSD measurements and compare them to simultaneous gold-standard ICP measurements. The ONSD US measurements were performed 30 to 60 seconds prior to suctioning, during suctioning, and 30 to 60 seconds after suctioning.

Even during this very rapid time course, a strong correlation between ICP and ONSD measurements was demonstrated. The R2 value was 0.80. There was no perceptible “lag” in ONSD change; changes in ICP were immediately reflected in ONSD. Notably, an absolute change of less than 8 to 10 mm Hg in ICP did not affect ONSD, which is consistent with data collected by Hansen and Helmke.¹²

Therapeutic Lumbar Puncture for IIH

There are two case reports of ONSD US measurements being taken pre- and postlumbar puncture (LP) in patients with IIH. In the first, in 1989 Galetta et al¹⁴ used A-scan US to measure pre- and post-LP ONSD in a woman with papilledema secondary to IIH. They found a significant reduction in ONSD bilaterally “within minutes” of performing the LP.¹⁴

The second case report was published in 2015 by Singleton et al.¹⁵ They recorded ONSD measurements 30 minutes pre- and post-LP in a woman who presented to the ED with symptoms from elevated ICP. After reduction of pressure via LP, they recorded a significant reduction in ONSD bilaterally.¹⁵

Cadaver Data

Hansen et al¹⁶ evaluated the distensibility and elasticity of the ONS using postmortem optic nerve preparations. The ONSD was recorded 200 seconds after each pressure increase, which was long enough to achieve stable diameters. They found a linear correlation between pressure increases of 5 to 45 mm Hg and ONSD. This would suggest a potential positively correlated change in ONSD with in vivo changes in ICP. However, this still needs further clinical study to better assess measurable changes in living patients.

Conclusion

Published data have consistently demonstrated that changes in ICP are rapidly transmitted to the optic nerve sheath and that there does not appear to be a temporal lag in the ONSD. Based on in vivo data, the relationship between ICP and ONSD appears to be linear only over a range of moderately elevated ICP. According to Hansen and Helmke,¹² this range starts at approximately 18 to 30 mm Hg, and ends at approximately 40 to 45 mm Hg. Maissan et al¹³ observed similar findings: “At low levels, ICP changes (8-10 mm Hg) do not affect the ONSD.”

There is still need for additional research to validate and refine these findings. Only one study has compared gold-standard ICP measurements with ONSD US measurements in real time,¹³ and the literature on ONSD US in tracking ICP after therapeutic LP in IIH consists of only two case reports.

Thus, with some caveats, ONSD US appears to permit qualitative tracking of ICP in real time. This supports its use in situations where a patient may have rapidly changing ICP, such as close monitoring of patients at risk for elevated ICP in a critical care setting, and response to treatment in patients with IIH.

Case Scenarios

Case 1

While working abroad in a resource-limited environment, a patient was brought in after falling and hitting his head. Initially, the patient was awake and alert, but he gradually became minimally responsive, with a Glasgow Coma Scale score of 9. Your facility did not have computed tomography (CT) or magnetic resonance imaging (MRI), but did have a point-of-care ultrasound (US) machine. You measured the patient’s optic nerve sheath diameter (ONSD) with the US and found a diameter of 4.5 mm in each eye. With this clinical change, you wondered if repeat US scans to detect increasing intracranial pressure (ICP) would represent changes in the patient’s condition.

Case 2

A patient who presented with an intracranial hemorrhage was treated with hypertonic saline and was awaiting neurosurgical placement of an extraventicular drain. During this time, a resident who was on a US rotation asked you if she would be able to detect changes in the patient’s ICP using US rather than placing an invasive device. How do you respond?

In adults, ICP is normally 10 to 15 mm Hg. It may be pathologically increased in several life-threatening conditions, including traumatic brain injury (TBI), subarachnoid hemorrhage, central venous thrombosis, brain tumor, and abscess. It is also increased by nonacute pathology, such as idiopathic intracranial hypertension (IIH), which also is known as pseudotumor cerebri. In patients with acute pathology, ICP above 20 mm Hg is generally considered an indication for treatment.¹ Indications for ICP monitoring in TBI include positive CT findings, patient age greater than 40 years, systemic hypotension, or abnormal flexion/extension in response to pain.² Other reasons to monitor ICP include the management of pseudotumor cerebri or after ventriculoperitoneal shunt surgery.³

Unfortunately, current methods of ICP monitoring have significant drawbacks and limitations. The gold standard of ICP monitoring—measurement using an intraventricular catheter—increases the risks of infection and hemorrhage, requires the skill of a neurosurgeon, and may be contraindicated due to coagulopathy or thrombocytopenia. It also cannot be done in a prehospital setting and only to a limited extent in the ED.⁴

Computed tomography scans and MRI can assess elevated ICP, but these tests are expensive, may increase patient radiation exposure, require patient transport, and may not always detect raised ICP. In the appropriate clinical context, signs present on physical examination, such as decorticate/decerebrate posturing, papilledema, or fixed/dilated pupils, may be highly suggestive of an increased ICP, but sensitivity and specificity are inadequate. Delay in diagnosis is also a drawback of imaging and physical examination, as findings may not present until ICP has been persistently elevated.

Given the disadvantages of current means of assessing elevated ICP, several noninvasive methods of measuring ICP are being investigated. These include such techniques as transcranial Doppler, electroencephalogram, pupillometry, and ONSD measurements.⁵ This article reviews current applications of ultrasonography measurements of the ONSD in assessing elevations in ICP.

ONSD US

Assessment of ICP via measurement of the ONSD has attracted increasing attention, particularly in emergency medicine. Measurements of the ONSD are possible with CT, MRI, and US. Of these modalities, ONSD US has attracted the most interest, due to its low cost, wide availability, and rapidity. It does not require patient transport, and does not expose a patient to additional radiation. In addition, ONSD US has been utilized in low-resource settings, and may be particularly useful in prehospital and mass-casualty situations.⁶

The underlying relationship between ONSD and ICP is a result of the enclosure of the subarachnoid space by the ONS. Increased ICP leads to expansion of the ONS, particularly at 3 mm behind the globe, in the retrobulbar compartment (Figures 1 and 2).⁷

Unfortunately, it is not possible to precisely determine ICP from an ONSD measurement, because baseline ONSD values and elasticity vary significantly within the population.^4,8 As a result, ONSD US has been investigated mostly for its ability to detect qualitative changes—particularly as a screen for elevated ICP. Optic nerve sheath diameter has high discriminative value in its ability to distinguish normal from elevated ICP. In a meta-analysis, Dubourg et al⁹ showed that the technique had an area under the summary receiver-operating curve of 0.94, signifying excellent test accuracy to diagnose elevated ICPs.

Researchers have attempted to determine a threshold value of ONSD that would serve as a clinically useful predictor of elevated ICP. Currently, this value ranges from 4.8 to 5.9 mm, depending on the study⁹; 5 mm is commonly used clinically as a threshold.¹⁰

Using ONSD US to Monitor Rapid Changes in ICP

While the use of the ONSD technique to screen for elevated ICP is relatively well established, the use of ONSD US to track acute changes in ICP is not as well studied. Serial tracking of acute changes could be useful in a patient at risk for intracranial hypertension secondary to trauma, to monitor the results of treating a patient with IIH, or after ventriculoperitoneal shunt placement.³

In Vivo Data

In 1993, Tamburrelli et al¹¹ performed the first ONSD intrathecal infusion study, using A-scan sonography, and concluded that there was a “direct, biphasic, positive relation between diastolic intracranial pressure and optic nerve diameters” and that the data showed “rapid changes of optic nerve diameters in response to variation of intracranial pressure.”

In 1997, Hansen and Helmke¹² recorded ONSD versus ICP data in the first intrathecal infusion test to use B-scan mode sonography. Ultrasonography was performed at 2- to 4-minute intervals. Their data demonstrated a linear relationship between ICP and ONSD over a particular cerebrospinal fluid pressure interval. They noted that “this interval differed between patients: ONS dilation commenced at pressure thresholds between 15 mm Hg and 30 mm Hg and in some patients saturation of the response (constant ONSD) occurred between 30 mm Hg and 40 mm Hg.”

The slope of ONSD versus ICP curve varied considerably by patient, making it impossible to infer an absolute ICP value from an ONSD without prior knowledge of the patient’s ratio. Similar to the data from Tamburrelli et al,¹¹ Hansen and Helmke¹² also found that there was no lag in ONSD response to ICP: “Within this interval, no temporal delay of the ONS response was noted.”

The only study comparing real-time ONSD data to gold-standard measurements of rapidly changing ICP in humans was performed by Maissan et al¹³ in 2015. This study involved a cohort of 18 patients who had suffered TBI and had intraparenchymal probes inserted. Because ICP rises transiently during endotracheal tube suctioning due to irritation of the trachea, the increase and subsequent decrease after suctioning was an ideal time to perform ONSD measurements and compare them to simultaneous gold-standard ICP measurements. The ONSD US measurements were performed 30 to 60 seconds prior to suctioning, during suctioning, and 30 to 60 seconds after suctioning.

Even during this very rapid time course, a strong correlation between ICP and ONSD measurements was demonstrated. The R2 value was 0.80. There was no perceptible “lag” in ONSD change; changes in ICP were immediately reflected in ONSD. Notably, an absolute change of less than 8 to 10 mm Hg in ICP did not affect ONSD, which is consistent with data collected by Hansen and Helmke.¹²

Therapeutic Lumbar Puncture for IIH

There are two case reports of ONSD US measurements being taken pre- and postlumbar puncture (LP) in patients with IIH. In the first, in 1989 Galetta et al¹⁴ used A-scan US to measure pre- and post-LP ONSD in a woman with papilledema secondary to IIH. They found a significant reduction in ONSD bilaterally “within minutes” of performing the LP.¹⁴

The second case report was published in 2015 by Singleton et al.¹⁵ They recorded ONSD measurements 30 minutes pre- and post-LP in a woman who presented to the ED with symptoms from elevated ICP. After reduction of pressure via LP, they recorded a significant reduction in ONSD bilaterally.¹⁵

Cadaver Data

Hansen et al¹⁶ evaluated the distensibility and elasticity of the ONS using postmortem optic nerve preparations. The ONSD was recorded 200 seconds after each pressure increase, which was long enough to achieve stable diameters. They found a linear correlation between pressure increases of 5 to 45 mm Hg and ONSD. This would suggest a potential positively correlated change in ONSD with in vivo changes in ICP. However, this still needs further clinical study to better assess measurable changes in living patients.

Conclusion

Published data have consistently demonstrated that changes in ICP are rapidly transmitted to the optic nerve sheath and that there does not appear to be a temporal lag in the ONSD. Based on in vivo data, the relationship between ICP and ONSD appears to be linear only over a range of moderately elevated ICP. According to Hansen and Helmke,¹² this range starts at approximately 18 to 30 mm Hg, and ends at approximately 40 to 45 mm Hg. Maissan et al¹³ observed similar findings: “At low levels, ICP changes (8-10 mm Hg) do not affect the ONSD.”

There is still need for additional research to validate and refine these findings. Only one study has compared gold-standard ICP measurements with ONSD US measurements in real time,¹³ and the literature on ONSD US in tracking ICP after therapeutic LP in IIH consists of only two case reports.

Thus, with some caveats, ONSD US appears to permit qualitative tracking of ICP in real time. This supports its use in situations where a patient may have rapidly changing ICP, such as close monitoring of patients at risk for elevated ICP in a critical care setting, and response to treatment in patients with IIH.

Case Scenarios

Case 1

While working abroad in a resource-limited environment, a patient was brought in after falling and hitting his head. Initially, the patient was awake and alert, but he gradually became minimally responsive, with a Glasgow Coma Scale score of 9. Your facility did not have computed tomography (CT) or magnetic resonance imaging (MRI), but did have a point-of-care ultrasound (US) machine. You measured the patient’s optic nerve sheath diameter (ONSD) with the US and found a diameter of 4.5 mm in each eye. With this clinical change, you wondered if repeat US scans to detect increasing intracranial pressure (ICP) would represent changes in the patient’s condition.

Case 2

A patient who presented with an intracranial hemorrhage was treated with hypertonic saline and was awaiting neurosurgical placement of an extraventicular drain. During this time, a resident who was on a US rotation asked you if she would be able to detect changes in the patient’s ICP using US rather than placing an invasive device. How do you respond?

In adults, ICP is normally 10 to 15 mm Hg. It may be pathologically increased in several life-threatening conditions, including traumatic brain injury (TBI), subarachnoid hemorrhage, central venous thrombosis, brain tumor, and abscess. It is also increased by nonacute pathology, such as idiopathic intracranial hypertension (IIH), which also is known as pseudotumor cerebri. In patients with acute pathology, ICP above 20 mm Hg is generally considered an indication for treatment.¹ Indications for ICP monitoring in TBI include positive CT findings, patient age greater than 40 years, systemic hypotension, or abnormal flexion/extension in response to pain.² Other reasons to monitor ICP include the management of pseudotumor cerebri or after ventriculoperitoneal shunt surgery.³

Unfortunately, current methods of ICP monitoring have significant drawbacks and limitations. The gold standard of ICP monitoring—measurement using an intraventricular catheter—increases the risks of infection and hemorrhage, requires the skill of a neurosurgeon, and may be contraindicated due to coagulopathy or thrombocytopenia. It also cannot be done in a prehospital setting and only to a limited extent in the ED.⁴

Computed tomography scans and MRI can assess elevated ICP, but these tests are expensive, may increase patient radiation exposure, require patient transport, and may not always detect raised ICP. In the appropriate clinical context, signs present on physical examination, such as decorticate/decerebrate posturing, papilledema, or fixed/dilated pupils, may be highly suggestive of an increased ICP, but sensitivity and specificity are inadequate. Delay in diagnosis is also a drawback of imaging and physical examination, as findings may not present until ICP has been persistently elevated.

Given the disadvantages of current means of assessing elevated ICP, several noninvasive methods of measuring ICP are being investigated. These include such techniques as transcranial Doppler, electroencephalogram, pupillometry, and ONSD measurements.⁵ This article reviews current applications of ultrasonography measurements of the ONSD in assessing elevations in ICP.

ONSD US

Assessment of ICP via measurement of the ONSD has attracted increasing attention, particularly in emergency medicine. Measurements of the ONSD are possible with CT, MRI, and US. Of these modalities, ONSD US has attracted the most interest, due to its low cost, wide availability, and rapidity. It does not require patient transport, and does not expose a patient to additional radiation. In addition, ONSD US has been utilized in low-resource settings, and may be particularly useful in prehospital and mass-casualty situations.⁶

The underlying relationship between ONSD and ICP is a result of the enclosure of the subarachnoid space by the ONS. Increased ICP leads to expansion of the ONS, particularly at 3 mm behind the globe, in the retrobulbar compartment (Figures 1 and 2).⁷

Unfortunately, it is not possible to precisely determine ICP from an ONSD measurement, because baseline ONSD values and elasticity vary significantly within the population.^4,8 As a result, ONSD US has been investigated mostly for its ability to detect qualitative changes—particularly as a screen for elevated ICP. Optic nerve sheath diameter has high discriminative value in its ability to distinguish normal from elevated ICP. In a meta-analysis, Dubourg et al⁹ showed that the technique had an area under the summary receiver-operating curve of 0.94, signifying excellent test accuracy to diagnose elevated ICPs.

Researchers have attempted to determine a threshold value of ONSD that would serve as a clinically useful predictor of elevated ICP. Currently, this value ranges from 4.8 to 5.9 mm, depending on the study⁹; 5 mm is commonly used clinically as a threshold.¹⁰

Using ONSD US to Monitor Rapid Changes in ICP

While the use of the ONSD technique to screen for elevated ICP is relatively well established, the use of ONSD US to track acute changes in ICP is not as well studied. Serial tracking of acute changes could be useful in a patient at risk for intracranial hypertension secondary to trauma, to monitor the results of treating a patient with IIH, or after ventriculoperitoneal shunt placement.³

In Vivo Data

In 1993, Tamburrelli et al¹¹ performed the first ONSD intrathecal infusion study, using A-scan sonography, and concluded that there was a “direct, biphasic, positive relation between diastolic intracranial pressure and optic nerve diameters” and that the data showed “rapid changes of optic nerve diameters in response to variation of intracranial pressure.”

In 1997, Hansen and Helmke¹² recorded ONSD versus ICP data in the first intrathecal infusion test to use B-scan mode sonography. Ultrasonography was performed at 2- to 4-minute intervals. Their data demonstrated a linear relationship between ICP and ONSD over a particular cerebrospinal fluid pressure interval. They noted that “this interval differed between patients: ONS dilation commenced at pressure thresholds between 15 mm Hg and 30 mm Hg and in some patients saturation of the response (constant ONSD) occurred between 30 mm Hg and 40 mm Hg.”

The slope of ONSD versus ICP curve varied considerably by patient, making it impossible to infer an absolute ICP value from an ONSD without prior knowledge of the patient’s ratio. Similar to the data from Tamburrelli et al,¹¹ Hansen and Helmke¹² also found that there was no lag in ONSD response to ICP: “Within this interval, no temporal delay of the ONS response was noted.”

The only study comparing real-time ONSD data to gold-standard measurements of rapidly changing ICP in humans was performed by Maissan et al¹³ in 2015. This study involved a cohort of 18 patients who had suffered TBI and had intraparenchymal probes inserted. Because ICP rises transiently during endotracheal tube suctioning due to irritation of the trachea, the increase and subsequent decrease after suctioning was an ideal time to perform ONSD measurements and compare them to simultaneous gold-standard ICP measurements. The ONSD US measurements were performed 30 to 60 seconds prior to suctioning, during suctioning, and 30 to 60 seconds after suctioning.

Even during this very rapid time course, a strong correlation between ICP and ONSD measurements was demonstrated. The R2 value was 0.80. There was no perceptible “lag” in ONSD change; changes in ICP were immediately reflected in ONSD. Notably, an absolute change of less than 8 to 10 mm Hg in ICP did not affect ONSD, which is consistent with data collected by Hansen and Helmke.¹²

Therapeutic Lumbar Puncture for IIH

There are two case reports of ONSD US measurements being taken pre- and postlumbar puncture (LP) in patients with IIH. In the first, in 1989 Galetta et al¹⁴ used A-scan US to measure pre- and post-LP ONSD in a woman with papilledema secondary to IIH. They found a significant reduction in ONSD bilaterally “within minutes” of performing the LP.¹⁴

The second case report was published in 2015 by Singleton et al.¹⁵ They recorded ONSD measurements 30 minutes pre- and post-LP in a woman who presented to the ED with symptoms from elevated ICP. After reduction of pressure via LP, they recorded a significant reduction in ONSD bilaterally.¹⁵

Cadaver Data

Hansen et al¹⁶ evaluated the distensibility and elasticity of the ONS using postmortem optic nerve preparations. The ONSD was recorded 200 seconds after each pressure increase, which was long enough to achieve stable diameters. They found a linear correlation between pressure increases of 5 to 45 mm Hg and ONSD. This would suggest a potential positively correlated change in ONSD with in vivo changes in ICP. However, this still needs further clinical study to better assess measurable changes in living patients.

Conclusion

Published data have consistently demonstrated that changes in ICP are rapidly transmitted to the optic nerve sheath and that there does not appear to be a temporal lag in the ONSD. Based on in vivo data, the relationship between ICP and ONSD appears to be linear only over a range of moderately elevated ICP. According to Hansen and Helmke,¹² this range starts at approximately 18 to 30 mm Hg, and ends at approximately 40 to 45 mm Hg. Maissan et al¹³ observed similar findings: “At low levels, ICP changes (8-10 mm Hg) do not affect the ONSD.”

There is still need for additional research to validate and refine these findings. Only one study has compared gold-standard ICP measurements with ONSD US measurements in real time,¹³ and the literature on ONSD US in tracking ICP after therapeutic LP in IIH consists of only two case reports.

Thus, with some caveats, ONSD US appears to permit qualitative tracking of ICP in real time. This supports its use in situations where a patient may have rapidly changing ICP, such as close monitoring of patients at risk for elevated ICP in a critical care setting, and response to treatment in patients with IIH.

The management of a febrile infant is complex and requires obtaining a detailed history of all possible exposures. Published guidelines alone are not always completely accurate for diagnosing or excluding serious illness, and are not a substitute for a thorough examination and history.

Case

The parents of a 45-day-old girl were referred to our regional pediatric hospital by a local community hospital for emergent evaluation of their infant. The day prior, they had taken the infant to the referring ED because of persistent fussiness and subjective fever. They were neither sure of the tests that were obtained during that visit nor why they were instructed to take their daughter to our pediatric facility. They did, however, recall that during the visit to the community ED, the patient had a rectal temperature of 102.7°F, was given an antibiotic injection, and was well appearing and acting normally. Also, at discharge, the infant’s parents were instructed to follow up with the patient’s pediatrician within 24 hours.

Since their daughter’s discharge from the community ED, both parents noted that she seemed more irritable, felt warm, and had not been feeding well. They confirmed that she was an otherwise healthy infant who had been born full term via normal vaginal delivery and without complications.

On initial assessment at our ED, the patient was fussy and had mottled extremities and dusky nail beds. Her vital signs at presentation were: heart rate, 223 beats/minute; respiratory rate, 36 breaths/minute; and rectal temperature, 103.6°F. Oxygen saturation was 96% on room air. The infant was resuscitated with 20 mL/kg of intravenous (IV) normal saline and given oral acetaminophen. Laboratory studies were obtained, and a lumbar puncture (LP) was performed.

She was treated with IV acyclovir, ceftriaxone, and vancomycin. Her complete blood count (CBC) was notable for a white blood cell count (WBC) of 22.60 x 10⁹/L; cerebrospinal fluid (CSF) analysis revealed a WBC of 4.52 x 10⁹/L with 75% neutrophils, and serum glucose of 63 mg/dL.

Since the patient’s parents did not have any paperwork or information from the prior ED visit, our ED contacted the community ED by phone, and a representative provided the following information: the patient had appeared well but was febrile at presentation; laboratory evaluation was obtained, but no LP was performed; she was treated with intramuscular (IM) ceftriaxone and acetaminophen; and she was discharged home in the care of her parents. Regarding laboratory studies performed at the community ED, the only test result made available by phone was the preliminary blood culture report that revealed growth of gram-negative rods with speciation pending, which prompted the referral to our facility.

Based on the information provided by the community ED and our evaluation and work-up, the patient was admitted to the pediatric intensive care unit. Magnetic resonance imaging (MRI) of the brain was performed, which showed debris in the lateral ventricles consistent with ventriculitis—likely secondary to meningitis. The blood, urine, and cerebrospinal fluid (CSF) cultures collected during our evaluation produced no growth; however, blood cultures from the rural ED eventually grew Salmonella.

A further detailed history revealed that the infant and her parents had been living with a family friend who owned an iguana. According to reports, the iguana had free run of the home and often crawled around and across the infant while she was lying on a blanket on the floor. The patient’s parents were not aware of the diseases associated with reptile contact. Due to concerns over the social situation, the patient was kept in the hospital for the entire recommended 21-day course of antibiotic therapy, during which time the parents received assistance finding alternate living arrangements.

Discussion

Current Practice Guidelines for Managing Febrile Infants

Current guidelines from the American Academy of Pediatrics (AAP) and the American College of Emergency Physicians (ACEP) recommend a full sepsis work-up for all neonates (ie, ages 0 to 28 days) who present with a fever (defined as a rectal temperature ≥100.4°F).^1,2 The probability of a serious bacterial infection (SBI) in patients in this age group who present with fever is approximately 12%.³ A full sepsis work-up generally includes a CBC, blood cultures, urinalysis with culture, CSF analysis with culture, and stool cultures if diarrhea is present.

Current guidelines for infants 29 to 90 days of age who present with fever differ between professional associations. The AAP and the American Academy of Family Physicians recommend the following for children in this age range: laboratory evaluation with CBC, blood cultures, CSF analysis, urinalysis, and culture. If laboratory evaluation reveals a WBC of less than 15 x 10⁹/L with an absolute neutrophil count of less than 10 x 10⁹/L, along with a normal CSF and urinalysis, the patient can be given IM ceftriaxone and follow-up arranged in 24 hours. This approach is recommended for patients who are otherwise healthy, nontoxic at presentation, and under the care of a responsible adult.^4,5 By comparison, the Philadelphia protocol, though suggesting an identical work-up, recommends against the use of antibiotics in infants deemed at low risk for SBI.⁶

The ACEP does not specifically endorse a management strategy for febrile infants in the 29- to 90-day age group, but instead acknowledges that no age cut-off within this group can be considered absolute when determining management strategy, and suggests that children up to 60 days old should be managed in a manner similar to neonates.² The published guidelines do not include consideration of specific history exposure in the management recommendations.

Typhoidal Serotypes

Salmonella can be divided into typhoidal (including S typhi and S paratyphi) and nontyphoidal serotypes (NTS), with the two groups manifesting as very different diseases.⁷ Typhoidal serotypes lead to the disease process known as typhoid, which typically presents with fever, chills, abdominal pain, nonbloody diarrhea or constipation, nausea, anorexia, headache, hepatosplenomegaly, and rose spots.⁸ These symptoms typically present after a 14-day incubation period and persist for 21 days.⁹ Humans are the only known infected source of these species, which are spread via the fecal-oral route.¹⁰

In contrast, disease from NTS manifests within 12 hours of exposure with watery diarrhea, nausea, vomiting, and fever, with symptoms lasting up to 10 days.¹¹ Both groups cause disease by invading the intestinal epithelium¹²; however, typhoidal species induce less intestinal inflammation, facilitating bacterial invasion and making systemic disease more likely.¹³

Transmission

Many animals are known to carry NTS, including reptiles, where Salmonella occurs naturally in their gastrointestinal tract.¹⁴ Twenty-five percent of Salmonella infections in children younger than age 5 years have been attributed to contact with a pet,¹⁵ with small turtles (shell diameter <4 inches) accounting for 42% of all pet-related Salmonella infections.

Though gastroenteritis is the most common clinical manifestation of infection with NTS, approximately 5% of patients will develop invasive disease, including bacteremia, meningitis, septic arthritis, or osteomyelitis.¹⁶ Children with invasive disease are more likely to have been exposed to an iguana, snake, or bearded dragon than to a turtle. If the pet is kept indoors, the risk of invasive disease is more likely. The average age of patients with invasive disease is 62 days, versus 2 years for noninvasive disease.¹⁷

Diagnosis

Growth of Salmonella on cultures of stool, blood, urine, or CSF dishes is the mainstay of diagnosis of typhoid and nontyphoidal disease, but bacterial concentrations are higher in bone marrow aspirate, making it superior to blood cultures.¹⁸ Biopsy of the rose spots of typhoid may also provide the diagnosis.

Management

Since Salmonella gastroenteritis is usually a self-limited disease, current recommendations reserve treatment with antibiotics for patients with severe disease or who are immunocompromised. When necessary, treatment consists of 7 to 10 days of a fluoroquinolone or third-generation cephalosporin, which is the same regimen suggested for typhoid. Treatment of central nervous system (CNS) salmonellosis consists of at least 3 weeks of a third-generation cephalosporin; the AAP recommends at least 4 weeks of treatment.¹⁹

Case Conclusion

Prior to the patient’s transfer to our facility, she was treated empirically with ceftriaxone without prior CSF analysis—an approach that does not follow any current guidelines for the treatment of a febrile infant. Though an LP was not performed until approximately 24 hours after the initial antibiotic was given, the patient demonstrated CSF pleocytosis with no organisms on gram stain and no growth on culture. Given this pleocytosis and Salmonella bacteremia in the context of prior antibiotic treatment, and MRI consistent with CNS involvement, the patient was treated for 21 days for presumed Salmonella meningitis. A CSF analysis performed on her initial visit could have more accurately directed the type and duration of treatment if the findings on subsequent imaging studies and CSF analysis were ambiguous.

Summary

Emergency physicians may underestimate the likelihood of SBI in otherwise well-appearing febrile infants. While certain aspects of the history and physical examination in a febrile, well-appearing infant have been shown to correlate with an increased risk of SBI, no single finding can definitively rule in or rule out the disease.²⁰ Opinions differ as to optimal management strategies for febrile, well-appearing infants outside the neonatal period. However, an appropriate level of clinical suspicion, within the context of a thorough investigation into the infant’s health history and social situation, can aid the clinician and guide treatment and disposition.

The management of a febrile infant is complex and requires obtaining a detailed history of all possible exposures. Published guidelines alone are not always completely accurate for diagnosing or excluding serious illness, and are not a substitute for a thorough examination and history.

Case

The parents of a 45-day-old girl were referred to our regional pediatric hospital by a local community hospital for emergent evaluation of their infant. The day prior, they had taken the infant to the referring ED because of persistent fussiness and subjective fever. They were neither sure of the tests that were obtained during that visit nor why they were instructed to take their daughter to our pediatric facility. They did, however, recall that during the visit to the community ED, the patient had a rectal temperature of 102.7°F, was given an antibiotic injection, and was well appearing and acting normally. Also, at discharge, the infant’s parents were instructed to follow up with the patient’s pediatrician within 24 hours.

Since their daughter’s discharge from the community ED, both parents noted that she seemed more irritable, felt warm, and had not been feeding well. They confirmed that she was an otherwise healthy infant who had been born full term via normal vaginal delivery and without complications.

On initial assessment at our ED, the patient was fussy and had mottled extremities and dusky nail beds. Her vital signs at presentation were: heart rate, 223 beats/minute; respiratory rate, 36 breaths/minute; and rectal temperature, 103.6°F. Oxygen saturation was 96% on room air. The infant was resuscitated with 20 mL/kg of intravenous (IV) normal saline and given oral acetaminophen. Laboratory studies were obtained, and a lumbar puncture (LP) was performed.

She was treated with IV acyclovir, ceftriaxone, and vancomycin. Her complete blood count (CBC) was notable for a white blood cell count (WBC) of 22.60 x 10⁹/L; cerebrospinal fluid (CSF) analysis revealed a WBC of 4.52 x 10⁹/L with 75% neutrophils, and serum glucose of 63 mg/dL.

Since the patient’s parents did not have any paperwork or information from the prior ED visit, our ED contacted the community ED by phone, and a representative provided the following information: the patient had appeared well but was febrile at presentation; laboratory evaluation was obtained, but no LP was performed; she was treated with intramuscular (IM) ceftriaxone and acetaminophen; and she was discharged home in the care of her parents. Regarding laboratory studies performed at the community ED, the only test result made available by phone was the preliminary blood culture report that revealed growth of gram-negative rods with speciation pending, which prompted the referral to our facility.

Based on the information provided by the community ED and our evaluation and work-up, the patient was admitted to the pediatric intensive care unit. Magnetic resonance imaging (MRI) of the brain was performed, which showed debris in the lateral ventricles consistent with ventriculitis—likely secondary to meningitis. The blood, urine, and cerebrospinal fluid (CSF) cultures collected during our evaluation produced no growth; however, blood cultures from the rural ED eventually grew Salmonella.

A further detailed history revealed that the infant and her parents had been living with a family friend who owned an iguana. According to reports, the iguana had free run of the home and often crawled around and across the infant while she was lying on a blanket on the floor. The patient’s parents were not aware of the diseases associated with reptile contact. Due to concerns over the social situation, the patient was kept in the hospital for the entire recommended 21-day course of antibiotic therapy, during which time the parents received assistance finding alternate living arrangements.

Discussion

Current Practice Guidelines for Managing Febrile Infants

Current guidelines from the American Academy of Pediatrics (AAP) and the American College of Emergency Physicians (ACEP) recommend a full sepsis work-up for all neonates (ie, ages 0 to 28 days) who present with a fever (defined as a rectal temperature ≥100.4°F).^1,2 The probability of a serious bacterial infection (SBI) in patients in this age group who present with fever is approximately 12%.³ A full sepsis work-up generally includes a CBC, blood cultures, urinalysis with culture, CSF analysis with culture, and stool cultures if diarrhea is present.

Current guidelines for infants 29 to 90 days of age who present with fever differ between professional associations. The AAP and the American Academy of Family Physicians recommend the following for children in this age range: laboratory evaluation with CBC, blood cultures, CSF analysis, urinalysis, and culture. If laboratory evaluation reveals a WBC of less than 15 x 10⁹/L with an absolute neutrophil count of less than 10 x 10⁹/L, along with a normal CSF and urinalysis, the patient can be given IM ceftriaxone and follow-up arranged in 24 hours. This approach is recommended for patients who are otherwise healthy, nontoxic at presentation, and under the care of a responsible adult.^4,5 By comparison, the Philadelphia protocol, though suggesting an identical work-up, recommends against the use of antibiotics in infants deemed at low risk for SBI.⁶

The ACEP does not specifically endorse a management strategy for febrile infants in the 29- to 90-day age group, but instead acknowledges that no age cut-off within this group can be considered absolute when determining management strategy, and suggests that children up to 60 days old should be managed in a manner similar to neonates.² The published guidelines do not include consideration of specific history exposure in the management recommendations.

Typhoidal Serotypes

Salmonella can be divided into typhoidal (including S typhi and S paratyphi) and nontyphoidal serotypes (NTS), with the two groups manifesting as very different diseases.⁷ Typhoidal serotypes lead to the disease process known as typhoid, which typically presents with fever, chills, abdominal pain, nonbloody diarrhea or constipation, nausea, anorexia, headache, hepatosplenomegaly, and rose spots.⁸ These symptoms typically present after a 14-day incubation period and persist for 21 days.⁹ Humans are the only known infected source of these species, which are spread via the fecal-oral route.¹⁰

In contrast, disease from NTS manifests within 12 hours of exposure with watery diarrhea, nausea, vomiting, and fever, with symptoms lasting up to 10 days.¹¹ Both groups cause disease by invading the intestinal epithelium¹²; however, typhoidal species induce less intestinal inflammation, facilitating bacterial invasion and making systemic disease more likely.¹³

Transmission

Many animals are known to carry NTS, including reptiles, where Salmonella occurs naturally in their gastrointestinal tract.¹⁴ Twenty-five percent of Salmonella infections in children younger than age 5 years have been attributed to contact with a pet,¹⁵ with small turtles (shell diameter <4 inches) accounting for 42% of all pet-related Salmonella infections.

Though gastroenteritis is the most common clinical manifestation of infection with NTS, approximately 5% of patients will develop invasive disease, including bacteremia, meningitis, septic arthritis, or osteomyelitis.¹⁶ Children with invasive disease are more likely to have been exposed to an iguana, snake, or bearded dragon than to a turtle. If the pet is kept indoors, the risk of invasive disease is more likely. The average age of patients with invasive disease is 62 days, versus 2 years for noninvasive disease.¹⁷

Diagnosis

Growth of Salmonella on cultures of stool, blood, urine, or CSF dishes is the mainstay of diagnosis of typhoid and nontyphoidal disease, but bacterial concentrations are higher in bone marrow aspirate, making it superior to blood cultures.¹⁸ Biopsy of the rose spots of typhoid may also provide the diagnosis.

Management

Since Salmonella gastroenteritis is usually a self-limited disease, current recommendations reserve treatment with antibiotics for patients with severe disease or who are immunocompromised. When necessary, treatment consists of 7 to 10 days of a fluoroquinolone or third-generation cephalosporin, which is the same regimen suggested for typhoid. Treatment of central nervous system (CNS) salmonellosis consists of at least 3 weeks of a third-generation cephalosporin; the AAP recommends at least 4 weeks of treatment.¹⁹

Case Conclusion

Prior to the patient’s transfer to our facility, she was treated empirically with ceftriaxone without prior CSF analysis—an approach that does not follow any current guidelines for the treatment of a febrile infant. Though an LP was not performed until approximately 24 hours after the initial antibiotic was given, the patient demonstrated CSF pleocytosis with no organisms on gram stain and no growth on culture. Given this pleocytosis and Salmonella bacteremia in the context of prior antibiotic treatment, and MRI consistent with CNS involvement, the patient was treated for 21 days for presumed Salmonella meningitis. A CSF analysis performed on her initial visit could have more accurately directed the type and duration of treatment if the findings on subsequent imaging studies and CSF analysis were ambiguous.

Summary

Emergency physicians may underestimate the likelihood of SBI in otherwise well-appearing febrile infants. While certain aspects of the history and physical examination in a febrile, well-appearing infant have been shown to correlate with an increased risk of SBI, no single finding can definitively rule in or rule out the disease.²⁰ Opinions differ as to optimal management strategies for febrile, well-appearing infants outside the neonatal period. However, an appropriate level of clinical suspicion, within the context of a thorough investigation into the infant’s health history and social situation, can aid the clinician and guide treatment and disposition.

The management of a febrile infant is complex and requires obtaining a detailed history of all possible exposures. Published guidelines alone are not always completely accurate for diagnosing or excluding serious illness, and are not a substitute for a thorough examination and history.

Case

The parents of a 45-day-old girl were referred to our regional pediatric hospital by a local community hospital for emergent evaluation of their infant. The day prior, they had taken the infant to the referring ED because of persistent fussiness and subjective fever. They were neither sure of the tests that were obtained during that visit nor why they were instructed to take their daughter to our pediatric facility. They did, however, recall that during the visit to the community ED, the patient had a rectal temperature of 102.7°F, was given an antibiotic injection, and was well appearing and acting normally. Also, at discharge, the infant’s parents were instructed to follow up with the patient’s pediatrician within 24 hours.

Since their daughter’s discharge from the community ED, both parents noted that she seemed more irritable, felt warm, and had not been feeding well. They confirmed that she was an otherwise healthy infant who had been born full term via normal vaginal delivery and without complications.

On initial assessment at our ED, the patient was fussy and had mottled extremities and dusky nail beds. Her vital signs at presentation were: heart rate, 223 beats/minute; respiratory rate, 36 breaths/minute; and rectal temperature, 103.6°F. Oxygen saturation was 96% on room air. The infant was resuscitated with 20 mL/kg of intravenous (IV) normal saline and given oral acetaminophen. Laboratory studies were obtained, and a lumbar puncture (LP) was performed.

She was treated with IV acyclovir, ceftriaxone, and vancomycin. Her complete blood count (CBC) was notable for a white blood cell count (WBC) of 22.60 x 10⁹/L; cerebrospinal fluid (CSF) analysis revealed a WBC of 4.52 x 10⁹/L with 75% neutrophils, and serum glucose of 63 mg/dL.

Since the patient’s parents did not have any paperwork or information from the prior ED visit, our ED contacted the community ED by phone, and a representative provided the following information: the patient had appeared well but was febrile at presentation; laboratory evaluation was obtained, but no LP was performed; she was treated with intramuscular (IM) ceftriaxone and acetaminophen; and she was discharged home in the care of her parents. Regarding laboratory studies performed at the community ED, the only test result made available by phone was the preliminary blood culture report that revealed growth of gram-negative rods with speciation pending, which prompted the referral to our facility.

Based on the information provided by the community ED and our evaluation and work-up, the patient was admitted to the pediatric intensive care unit. Magnetic resonance imaging (MRI) of the brain was performed, which showed debris in the lateral ventricles consistent with ventriculitis—likely secondary to meningitis. The blood, urine, and cerebrospinal fluid (CSF) cultures collected during our evaluation produced no growth; however, blood cultures from the rural ED eventually grew Salmonella.

A further detailed history revealed that the infant and her parents had been living with a family friend who owned an iguana. According to reports, the iguana had free run of the home and often crawled around and across the infant while she was lying on a blanket on the floor. The patient’s parents were not aware of the diseases associated with reptile contact. Due to concerns over the social situation, the patient was kept in the hospital for the entire recommended 21-day course of antibiotic therapy, during which time the parents received assistance finding alternate living arrangements.

Discussion

Current Practice Guidelines for Managing Febrile Infants

Current guidelines from the American Academy of Pediatrics (AAP) and the American College of Emergency Physicians (ACEP) recommend a full sepsis work-up for all neonates (ie, ages 0 to 28 days) who present with a fever (defined as a rectal temperature ≥100.4°F).^1,2 The probability of a serious bacterial infection (SBI) in patients in this age group who present with fever is approximately 12%.³ A full sepsis work-up generally includes a CBC, blood cultures, urinalysis with culture, CSF analysis with culture, and stool cultures if diarrhea is present.

Current guidelines for infants 29 to 90 days of age who present with fever differ between professional associations. The AAP and the American Academy of Family Physicians recommend the following for children in this age range: laboratory evaluation with CBC, blood cultures, CSF analysis, urinalysis, and culture. If laboratory evaluation reveals a WBC of less than 15 x 10⁹/L with an absolute neutrophil count of less than 10 x 10⁹/L, along with a normal CSF and urinalysis, the patient can be given IM ceftriaxone and follow-up arranged in 24 hours. This approach is recommended for patients who are otherwise healthy, nontoxic at presentation, and under the care of a responsible adult.^4,5 By comparison, the Philadelphia protocol, though suggesting an identical work-up, recommends against the use of antibiotics in infants deemed at low risk for SBI.⁶

The ACEP does not specifically endorse a management strategy for febrile infants in the 29- to 90-day age group, but instead acknowledges that no age cut-off within this group can be considered absolute when determining management strategy, and suggests that children up to 60 days old should be managed in a manner similar to neonates.² The published guidelines do not include consideration of specific history exposure in the management recommendations.

Typhoidal Serotypes

Salmonella can be divided into typhoidal (including S typhi and S paratyphi) and nontyphoidal serotypes (NTS), with the two groups manifesting as very different diseases.⁷ Typhoidal serotypes lead to the disease process known as typhoid, which typically presents with fever, chills, abdominal pain, nonbloody diarrhea or constipation, nausea, anorexia, headache, hepatosplenomegaly, and rose spots.⁸ These symptoms typically present after a 14-day incubation period and persist for 21 days.⁹ Humans are the only known infected source of these species, which are spread via the fecal-oral route.¹⁰

In contrast, disease from NTS manifests within 12 hours of exposure with watery diarrhea, nausea, vomiting, and fever, with symptoms lasting up to 10 days.¹¹ Both groups cause disease by invading the intestinal epithelium¹²; however, typhoidal species induce less intestinal inflammation, facilitating bacterial invasion and making systemic disease more likely.¹³

Transmission

Many animals are known to carry NTS, including reptiles, where Salmonella occurs naturally in their gastrointestinal tract.¹⁴ Twenty-five percent of Salmonella infections in children younger than age 5 years have been attributed to contact with a pet,¹⁵ with small turtles (shell diameter <4 inches) accounting for 42% of all pet-related Salmonella infections.

Though gastroenteritis is the most common clinical manifestation of infection with NTS, approximately 5% of patients will develop invasive disease, including bacteremia, meningitis, septic arthritis, or osteomyelitis.¹⁶ Children with invasive disease are more likely to have been exposed to an iguana, snake, or bearded dragon than to a turtle. If the pet is kept indoors, the risk of invasive disease is more likely. The average age of patients with invasive disease is 62 days, versus 2 years for noninvasive disease.¹⁷

Diagnosis

Growth of Salmonella on cultures of stool, blood, urine, or CSF dishes is the mainstay of diagnosis of typhoid and nontyphoidal disease, but bacterial concentrations are higher in bone marrow aspirate, making it superior to blood cultures.¹⁸ Biopsy of the rose spots of typhoid may also provide the diagnosis.

Management

Since Salmonella gastroenteritis is usually a self-limited disease, current recommendations reserve treatment with antibiotics for patients with severe disease or who are immunocompromised. When necessary, treatment consists of 7 to 10 days of a fluoroquinolone or third-generation cephalosporin, which is the same regimen suggested for typhoid. Treatment of central nervous system (CNS) salmonellosis consists of at least 3 weeks of a third-generation cephalosporin; the AAP recommends at least 4 weeks of treatment.¹⁹

Case Conclusion

Prior to the patient’s transfer to our facility, she was treated empirically with ceftriaxone without prior CSF analysis—an approach that does not follow any current guidelines for the treatment of a febrile infant. Though an LP was not performed until approximately 24 hours after the initial antibiotic was given, the patient demonstrated CSF pleocytosis with no organisms on gram stain and no growth on culture. Given this pleocytosis and Salmonella bacteremia in the context of prior antibiotic treatment, and MRI consistent with CNS involvement, the patient was treated for 21 days for presumed Salmonella meningitis. A CSF analysis performed on her initial visit could have more accurately directed the type and duration of treatment if the findings on subsequent imaging studies and CSF analysis were ambiguous.

Summary

Emergency physicians may underestimate the likelihood of SBI in otherwise well-appearing febrile infants. While certain aspects of the history and physical examination in a febrile, well-appearing infant have been shown to correlate with an increased risk of SBI, no single finding can definitively rule in or rule out the disease.²⁰ Opinions differ as to optimal management strategies for febrile, well-appearing infants outside the neonatal period. However, an appropriate level of clinical suspicion, within the context of a thorough investigation into the infant’s health history and social situation, can aid the clinician and guide treatment and disposition.

Most emergency physicians (EPs) encounter several patients a year with hemorrhages due to factor Xa (FXa) inhibitors. Such bleeding may occur in patterns not previously recognized with traditional anticoagulant therapy. Retrobulbar hemorrhage is typically associated with significant facial or orbital trauma, and spontaneous hemorrhage is a very rare cause of orbital compartment syndrome.¹ Retrobulbar hemorrhage can lead to orbital compartment syndrome due to increased orbital pressure within a closed space. Because orbital compartment syndrome can compromise blood flow to the optic nerve or central retinal artery, it is extremely important to decrease orbital pressure as quickly as possible in affected patients. Therefore, canthotomy/cantholysis should be performed sooner rather than later, as 90 minutes of elevated intraocular pressure (IOP) can lead to permanent vision loss.²

Rivaroxaban, one of the relatively new oral anticoagulant agents that inhibit FXa, is used as an alternative therapy to vitamin K antagonists. The FXa agents have been approved to reduce the risk of stroke in patients with nonvalvular atrial fibrillation (AF).³ According to a meta-analysis of rivaroxaban and bleeding risk, rivaroxaban was shown to have no increased risk of major or clinically relevant nonmajor bleeding compared to vitamin K antagonists. Rivaroxaban was also associated with a significant decrease in fatal bleeding (relative risk, 0.48, 95%; confidence interval, 0.31 to 0.74).⁴

Case Report

A 79-year-old man with a medical history of hypertension, transient ischemic attacks (TIAs), and AF, for which he was taking rivaroxaban, was referred to our ED by a local rural ED for further evaluation and treatment of a retrobulbar hemorrhage. (The patient’s family refused emergency medical services transport from the rural ED.) The patient stated that upon awakening earlier that morning, he felt “pressure” in his right eye and experienced periorbital swelling that continued to worsen throughout the day. He denied any trauma, falls, or strikes to the face or head. The patient’s account and history were confirmed by the family members with whom he resided.

During the patient’s evaluation at the rural ED, a computed tomography (CT) scan of the head was performed, which demonstrated a retrobulbar hematoma on the right side (See the Figure for an example of a CT scan illustrating a retrobulbar hematoma with proptosis). Since the patient’s initial right IOP was 32 mm Hg (normal range, 12-22 mm Hg), ophthalmology services at this institution performed a lateral canthotomy. The patient’s right IOP postsurgery decreased but remained elevated at 27 mm Hg. In addition to surgical intervention, he was given oral acetazolamide and timolol. Then, because the patient was hemodynamically stable, he was referred to our institution for further evaluation.

Upon arrival at our ED, the patient reported slow bleeding from the canthotomy site. He denied any chest pain, shortness of breath, light-headedness, dizziness, or visual changes. Additional history revealed that in addition to taking rivaroxaban, the patient was also on a daily 81-mg aspirin regimen. His vital signs at presentation were: blood pressure (BP), 130/68 mm Hg; heart rate, 75 beats/minute; and respiratory rate, 16 breaths/minute; and temperature, afebrile. Oxygen saturation was 99% on room air.

Physical examination revealed blood oozing from the right eye at the canthotomy site. There was no other evidence of trauma to the eye or head, and IOP of the right eye was normal at 14 mm Hg. Laboratory studies revealed a hemoglobin value of 16.8 g/dL, a hematocrit of 48%, and a white blood cell (WBC) count of 8.8 x 10⁹/L. The basic metabolic profile, including creatinine, was unremarkable. A type and screen blood pretransfusion compatibility test was also ordered.

Since the patient’s ocular hemorrhaging persisted, ophthalmology services were consulted. The ophthalmology examination measured a right IOP of 14 mm Hg and a visual acuity of 20/200. The patient’s pupils were equal, round, and reactive to light, and a subconjunctival hematoma was noted. The ophthalmologist recommended no further surgical interventions at that time.

Due to the continued ocular bleeding, hematology services were also consulted. The hematologist recommended 50 U/kg of intravenous (IV) prothrombin complex concentrate (PCC) to reverse the anticoagulatory effects of rivaroxaban. The patient was given one dose of PCC in the ED. Throughout his ED course, the patient did not experience any deterioration of visual acuity. However, during repeated IOP checks, he experienced one episode of vasovagal syncope with a systolic BP in the 70s. The syncope resolved promptly after the patient was placed in a supine position and was given an IV bolus of normal saline fluid. The patient still had oozing at the incision site, and was admitted to the general medicine floor. 

During his inpatient stay, the patient remained hemodynamically stable and did not require transfusion of blood or platelet products. All home anticoagulant medications were discontinued. The patient continued to have some oozing the following morning, and was given an additional dose of IV PCC (50 U/kg), which resolved the bleeding. He remained hemostatic and, based on his history of AF, he was discharged home on warfarin without bridge therapy. Both rivaroxaban and daily aspirin therapy were discontinued. The lateral canthotomy and cantholysis healed without need for surgical intervention. An ophthalmology follow-up clinic visit 1 week after discharge from the hospital revealed an already self-healed incision without ectropion or retraction and with only mild laxity. Given the patient’s history of AF with TIAs while off anticoagulants, the ophthalmologist did not recommend any other surgical intervention that would have required discontinuing the warfarin.

Discussion

With any retrobulbar hematoma, one must be concerned for orbital compartment syndrome. Orbital hemorrhage is the most common cause of orbital compartment syndrome, usually occurring secondary to trauma, surgery, or retrobulbar injection. In this case, spontaneous hemorrhage due to anticoagulation was believed to be the cause—albeit a rare one—of orbital compartment syndrome. Because the orbital space is enclosed and cannot expand, it is vulnerable to compartment syndrome, and subsequent ischemia can lead to permanent vision impairment or complete loss of vision.⁵ Early recognition and treatment is imperative to preserve vision as an elevated intraorbital pressure for 60 to 100 minutes can lead to permanent visual sequelae.

Management

Treatment of retrobulbar hemorrhage includes lateral canthotomy and cantholysis, which have been shown to reduce IOP an average of 14.2 mm Hg.⁶ In our patient, IOP in the affected eye was reduced by 18 mm Hg.  In addition to the patient’s high IOP at presentation, another concern was the continued hemorrhaging from both the incision site and its potential to exacerbate the underlying retrobulbar hematoma. Management of this condition posed a challenge because this patient was taking a newer anticoagulant, for which there is currently no specific reversal agent. After consultation with hematology services, the patient was given PCC because small studies have suggested that PCC may reverse rivaroxaban-induced anticoagulation.⁷ While more expensive than fresh frozen plasma, PCC has a high safety profile and should be considered in cases of life-threatening bleeding—especially in patients who have renal failure, as rivaroxaban is renally excreted. The half-life of rivaroxaban is 5 to 9 hours and its effects may last up to 12 hours. An IV dose of 50 U/kg PCC can be effective in reversing rivaroxaban; this dose can be repeated every 12 hours until hemorrhaging abates or until rivaroxaban is cleared. 

Potential Factor Xa Reversal Agent

Phase IV trials are underway in the ANNEX-A (Andexanet Alfa a Novel Antidote to the Anticoagulant Effects of FXa inhibitors – Apixaban) and ANNEX-R (Andexanet Alfa a Novel Antidote to the Anticoagulant Effects of FXa inhibitors – Rivaroxaban) studies assessing andexanet alpha, an FXa inhibitor reversal agent and potential FXa inhibitor antidote. Andexanet alpha is a decoy protein that binds to FXa inhibitors in the active site, restoring endogenous FXa and reducing anticoagulant activity.⁸ This serves as another promising reversal agent for apixaban, edoxaban, and rivaroxaban. With the development of these new FXa reversal agents, EPs will have more options for reversal of anticoagulation in patients with unique hemorrhagic presentations.

Conclusion

Rivaroxaban has the potential to replace warfarin as a “novel” oral anticoagulant of choice for multiple indications, especially as more insurance companies cover the use of the FXa inhibitors. As a result of their increased use, the EP is likely to see an increasing number of patients who present with hemorrhagic consequences of the FXa inhibitors, and in turn must be familiar with the properties of this class of anticoagulants—including potential reversal strategies.

Our case of spontaneous retrobulbar hemorrhage may be one of these new patterns of bleeding to be expected from a novel FXa inhibitor. Therefore, it is imperative that EPs consider retrobulbar hemorrhage and other possible bleeding locations in patients on an FXa inhibitor.

Most emergency physicians (EPs) encounter several patients a year with hemorrhages due to factor Xa (FXa) inhibitors. Such bleeding may occur in patterns not previously recognized with traditional anticoagulant therapy. Retrobulbar hemorrhage is typically associated with significant facial or orbital trauma, and spontaneous hemorrhage is a very rare cause of orbital compartment syndrome.¹ Retrobulbar hemorrhage can lead to orbital compartment syndrome due to increased orbital pressure within a closed space. Because orbital compartment syndrome can compromise blood flow to the optic nerve or central retinal artery, it is extremely important to decrease orbital pressure as quickly as possible in affected patients. Therefore, canthotomy/cantholysis should be performed sooner rather than later, as 90 minutes of elevated intraocular pressure (IOP) can lead to permanent vision loss.²

Rivaroxaban, one of the relatively new oral anticoagulant agents that inhibit FXa, is used as an alternative therapy to vitamin K antagonists. The FXa agents have been approved to reduce the risk of stroke in patients with nonvalvular atrial fibrillation (AF).³ According to a meta-analysis of rivaroxaban and bleeding risk, rivaroxaban was shown to have no increased risk of major or clinically relevant nonmajor bleeding compared to vitamin K antagonists. Rivaroxaban was also associated with a significant decrease in fatal bleeding (relative risk, 0.48, 95%; confidence interval, 0.31 to 0.74).⁴

Case Report

A 79-year-old man with a medical history of hypertension, transient ischemic attacks (TIAs), and AF, for which he was taking rivaroxaban, was referred to our ED by a local rural ED for further evaluation and treatment of a retrobulbar hemorrhage. (The patient’s family refused emergency medical services transport from the rural ED.) The patient stated that upon awakening earlier that morning, he felt “pressure” in his right eye and experienced periorbital swelling that continued to worsen throughout the day. He denied any trauma, falls, or strikes to the face or head. The patient’s account and history were confirmed by the family members with whom he resided.

During the patient’s evaluation at the rural ED, a computed tomography (CT) scan of the head was performed, which demonstrated a retrobulbar hematoma on the right side (See the Figure for an example of a CT scan illustrating a retrobulbar hematoma with proptosis). Since the patient’s initial right IOP was 32 mm Hg (normal range, 12-22 mm Hg), ophthalmology services at this institution performed a lateral canthotomy. The patient’s right IOP postsurgery decreased but remained elevated at 27 mm Hg. In addition to surgical intervention, he was given oral acetazolamide and timolol. Then, because the patient was hemodynamically stable, he was referred to our institution for further evaluation.

Upon arrival at our ED, the patient reported slow bleeding from the canthotomy site. He denied any chest pain, shortness of breath, light-headedness, dizziness, or visual changes. Additional history revealed that in addition to taking rivaroxaban, the patient was also on a daily 81-mg aspirin regimen. His vital signs at presentation were: blood pressure (BP), 130/68 mm Hg; heart rate, 75 beats/minute; and respiratory rate, 16 breaths/minute; and temperature, afebrile. Oxygen saturation was 99% on room air.

Physical examination revealed blood oozing from the right eye at the canthotomy site. There was no other evidence of trauma to the eye or head, and IOP of the right eye was normal at 14 mm Hg. Laboratory studies revealed a hemoglobin value of 16.8 g/dL, a hematocrit of 48%, and a white blood cell (WBC) count of 8.8 x 10⁹/L. The basic metabolic profile, including creatinine, was unremarkable. A type and screen blood pretransfusion compatibility test was also ordered.

Since the patient’s ocular hemorrhaging persisted, ophthalmology services were consulted. The ophthalmology examination measured a right IOP of 14 mm Hg and a visual acuity of 20/200. The patient’s pupils were equal, round, and reactive to light, and a subconjunctival hematoma was noted. The ophthalmologist recommended no further surgical interventions at that time.

Due to the continued ocular bleeding, hematology services were also consulted. The hematologist recommended 50 U/kg of intravenous (IV) prothrombin complex concentrate (PCC) to reverse the anticoagulatory effects of rivaroxaban. The patient was given one dose of PCC in the ED. Throughout his ED course, the patient did not experience any deterioration of visual acuity. However, during repeated IOP checks, he experienced one episode of vasovagal syncope with a systolic BP in the 70s. The syncope resolved promptly after the patient was placed in a supine position and was given an IV bolus of normal saline fluid. The patient still had oozing at the incision site, and was admitted to the general medicine floor. 

During his inpatient stay, the patient remained hemodynamically stable and did not require transfusion of blood or platelet products. All home anticoagulant medications were discontinued. The patient continued to have some oozing the following morning, and was given an additional dose of IV PCC (50 U/kg), which resolved the bleeding. He remained hemostatic and, based on his history of AF, he was discharged home on warfarin without bridge therapy. Both rivaroxaban and daily aspirin therapy were discontinued. The lateral canthotomy and cantholysis healed without need for surgical intervention. An ophthalmology follow-up clinic visit 1 week after discharge from the hospital revealed an already self-healed incision without ectropion or retraction and with only mild laxity. Given the patient’s history of AF with TIAs while off anticoagulants, the ophthalmologist did not recommend any other surgical intervention that would have required discontinuing the warfarin.

Discussion

With any retrobulbar hematoma, one must be concerned for orbital compartment syndrome. Orbital hemorrhage is the most common cause of orbital compartment syndrome, usually occurring secondary to trauma, surgery, or retrobulbar injection. In this case, spontaneous hemorrhage due to anticoagulation was believed to be the cause—albeit a rare one—of orbital compartment syndrome. Because the orbital space is enclosed and cannot expand, it is vulnerable to compartment syndrome, and subsequent ischemia can lead to permanent vision impairment or complete loss of vision.⁵ Early recognition and treatment is imperative to preserve vision as an elevated intraorbital pressure for 60 to 100 minutes can lead to permanent visual sequelae.

Management

Treatment of retrobulbar hemorrhage includes lateral canthotomy and cantholysis, which have been shown to reduce IOP an average of 14.2 mm Hg.⁶ In our patient, IOP in the affected eye was reduced by 18 mm Hg.  In addition to the patient’s high IOP at presentation, another concern was the continued hemorrhaging from both the incision site and its potential to exacerbate the underlying retrobulbar hematoma. Management of this condition posed a challenge because this patient was taking a newer anticoagulant, for which there is currently no specific reversal agent. After consultation with hematology services, the patient was given PCC because small studies have suggested that PCC may reverse rivaroxaban-induced anticoagulation.⁷ While more expensive than fresh frozen plasma, PCC has a high safety profile and should be considered in cases of life-threatening bleeding—especially in patients who have renal failure, as rivaroxaban is renally excreted. The half-life of rivaroxaban is 5 to 9 hours and its effects may last up to 12 hours. An IV dose of 50 U/kg PCC can be effective in reversing rivaroxaban; this dose can be repeated every 12 hours until hemorrhaging abates or until rivaroxaban is cleared. 

Potential Factor Xa Reversal Agent

Phase IV trials are underway in the ANNEX-A (Andexanet Alfa a Novel Antidote to the Anticoagulant Effects of FXa inhibitors – Apixaban) and ANNEX-R (Andexanet Alfa a Novel Antidote to the Anticoagulant Effects of FXa inhibitors – Rivaroxaban) studies assessing andexanet alpha, an FXa inhibitor reversal agent and potential FXa inhibitor antidote. Andexanet alpha is a decoy protein that binds to FXa inhibitors in the active site, restoring endogenous FXa and reducing anticoagulant activity.⁸ This serves as another promising reversal agent for apixaban, edoxaban, and rivaroxaban. With the development of these new FXa reversal agents, EPs will have more options for reversal of anticoagulation in patients with unique hemorrhagic presentations.

Conclusion

Rivaroxaban has the potential to replace warfarin as a “novel” oral anticoagulant of choice for multiple indications, especially as more insurance companies cover the use of the FXa inhibitors. As a result of their increased use, the EP is likely to see an increasing number of patients who present with hemorrhagic consequences of the FXa inhibitors, and in turn must be familiar with the properties of this class of anticoagulants—including potential reversal strategies.

Our case of spontaneous retrobulbar hemorrhage may be one of these new patterns of bleeding to be expected from a novel FXa inhibitor. Therefore, it is imperative that EPs consider retrobulbar hemorrhage and other possible bleeding locations in patients on an FXa inhibitor.

Most emergency physicians (EPs) encounter several patients a year with hemorrhages due to factor Xa (FXa) inhibitors. Such bleeding may occur in patterns not previously recognized with traditional anticoagulant therapy. Retrobulbar hemorrhage is typically associated with significant facial or orbital trauma, and spontaneous hemorrhage is a very rare cause of orbital compartment syndrome.¹ Retrobulbar hemorrhage can lead to orbital compartment syndrome due to increased orbital pressure within a closed space. Because orbital compartment syndrome can compromise blood flow to the optic nerve or central retinal artery, it is extremely important to decrease orbital pressure as quickly as possible in affected patients. Therefore, canthotomy/cantholysis should be performed sooner rather than later, as 90 minutes of elevated intraocular pressure (IOP) can lead to permanent vision loss.²

Rivaroxaban, one of the relatively new oral anticoagulant agents that inhibit FXa, is used as an alternative therapy to vitamin K antagonists. The FXa agents have been approved to reduce the risk of stroke in patients with nonvalvular atrial fibrillation (AF).³ According to a meta-analysis of rivaroxaban and bleeding risk, rivaroxaban was shown to have no increased risk of major or clinically relevant nonmajor bleeding compared to vitamin K antagonists. Rivaroxaban was also associated with a significant decrease in fatal bleeding (relative risk, 0.48, 95%; confidence interval, 0.31 to 0.74).⁴

Case Report

A 79-year-old man with a medical history of hypertension, transient ischemic attacks (TIAs), and AF, for which he was taking rivaroxaban, was referred to our ED by a local rural ED for further evaluation and treatment of a retrobulbar hemorrhage. (The patient’s family refused emergency medical services transport from the rural ED.) The patient stated that upon awakening earlier that morning, he felt “pressure” in his right eye and experienced periorbital swelling that continued to worsen throughout the day. He denied any trauma, falls, or strikes to the face or head. The patient’s account and history were confirmed by the family members with whom he resided.

During the patient’s evaluation at the rural ED, a computed tomography (CT) scan of the head was performed, which demonstrated a retrobulbar hematoma on the right side (See the Figure for an example of a CT scan illustrating a retrobulbar hematoma with proptosis). Since the patient’s initial right IOP was 32 mm Hg (normal range, 12-22 mm Hg), ophthalmology services at this institution performed a lateral canthotomy. The patient’s right IOP postsurgery decreased but remained elevated at 27 mm Hg. In addition to surgical intervention, he was given oral acetazolamide and timolol. Then, because the patient was hemodynamically stable, he was referred to our institution for further evaluation.

Upon arrival at our ED, the patient reported slow bleeding from the canthotomy site. He denied any chest pain, shortness of breath, light-headedness, dizziness, or visual changes. Additional history revealed that in addition to taking rivaroxaban, the patient was also on a daily 81-mg aspirin regimen. His vital signs at presentation were: blood pressure (BP), 130/68 mm Hg; heart rate, 75 beats/minute; and respiratory rate, 16 breaths/minute; and temperature, afebrile. Oxygen saturation was 99% on room air.

Physical examination revealed blood oozing from the right eye at the canthotomy site. There was no other evidence of trauma to the eye or head, and IOP of the right eye was normal at 14 mm Hg. Laboratory studies revealed a hemoglobin value of 16.8 g/dL, a hematocrit of 48%, and a white blood cell (WBC) count of 8.8 x 10⁹/L. The basic metabolic profile, including creatinine, was unremarkable. A type and screen blood pretransfusion compatibility test was also ordered.

Since the patient’s ocular hemorrhaging persisted, ophthalmology services were consulted. The ophthalmology examination measured a right IOP of 14 mm Hg and a visual acuity of 20/200. The patient’s pupils were equal, round, and reactive to light, and a subconjunctival hematoma was noted. The ophthalmologist recommended no further surgical interventions at that time.

Due to the continued ocular bleeding, hematology services were also consulted. The hematologist recommended 50 U/kg of intravenous (IV) prothrombin complex concentrate (PCC) to reverse the anticoagulatory effects of rivaroxaban. The patient was given one dose of PCC in the ED. Throughout his ED course, the patient did not experience any deterioration of visual acuity. However, during repeated IOP checks, he experienced one episode of vasovagal syncope with a systolic BP in the 70s. The syncope resolved promptly after the patient was placed in a supine position and was given an IV bolus of normal saline fluid. The patient still had oozing at the incision site, and was admitted to the general medicine floor. 

During his inpatient stay, the patient remained hemodynamically stable and did not require transfusion of blood or platelet products. All home anticoagulant medications were discontinued. The patient continued to have some oozing the following morning, and was given an additional dose of IV PCC (50 U/kg), which resolved the bleeding. He remained hemostatic and, based on his history of AF, he was discharged home on warfarin without bridge therapy. Both rivaroxaban and daily aspirin therapy were discontinued. The lateral canthotomy and cantholysis healed without need for surgical intervention. An ophthalmology follow-up clinic visit 1 week after discharge from the hospital revealed an already self-healed incision without ectropion or retraction and with only mild laxity. Given the patient’s history of AF with TIAs while off anticoagulants, the ophthalmologist did not recommend any other surgical intervention that would have required discontinuing the warfarin.

Discussion

With any retrobulbar hematoma, one must be concerned for orbital compartment syndrome. Orbital hemorrhage is the most common cause of orbital compartment syndrome, usually occurring secondary to trauma, surgery, or retrobulbar injection. In this case, spontaneous hemorrhage due to anticoagulation was believed to be the cause—albeit a rare one—of orbital compartment syndrome. Because the orbital space is enclosed and cannot expand, it is vulnerable to compartment syndrome, and subsequent ischemia can lead to permanent vision impairment or complete loss of vision.⁵ Early recognition and treatment is imperative to preserve vision as an elevated intraorbital pressure for 60 to 100 minutes can lead to permanent visual sequelae.

Management

Treatment of retrobulbar hemorrhage includes lateral canthotomy and cantholysis, which have been shown to reduce IOP an average of 14.2 mm Hg.⁶ In our patient, IOP in the affected eye was reduced by 18 mm Hg.  In addition to the patient’s high IOP at presentation, another concern was the continued hemorrhaging from both the incision site and its potential to exacerbate the underlying retrobulbar hematoma. Management of this condition posed a challenge because this patient was taking a newer anticoagulant, for which there is currently no specific reversal agent. After consultation with hematology services, the patient was given PCC because small studies have suggested that PCC may reverse rivaroxaban-induced anticoagulation.⁷ While more expensive than fresh frozen plasma, PCC has a high safety profile and should be considered in cases of life-threatening bleeding—especially in patients who have renal failure, as rivaroxaban is renally excreted. The half-life of rivaroxaban is 5 to 9 hours and its effects may last up to 12 hours. An IV dose of 50 U/kg PCC can be effective in reversing rivaroxaban; this dose can be repeated every 12 hours until hemorrhaging abates or until rivaroxaban is cleared. 

Potential Factor Xa Reversal Agent

Phase IV trials are underway in the ANNEX-A (Andexanet Alfa a Novel Antidote to the Anticoagulant Effects of FXa inhibitors – Apixaban) and ANNEX-R (Andexanet Alfa a Novel Antidote to the Anticoagulant Effects of FXa inhibitors – Rivaroxaban) studies assessing andexanet alpha, an FXa inhibitor reversal agent and potential FXa inhibitor antidote. Andexanet alpha is a decoy protein that binds to FXa inhibitors in the active site, restoring endogenous FXa and reducing anticoagulant activity.⁸ This serves as another promising reversal agent for apixaban, edoxaban, and rivaroxaban. With the development of these new FXa reversal agents, EPs will have more options for reversal of anticoagulation in patients with unique hemorrhagic presentations.

Conclusion

Rivaroxaban has the potential to replace warfarin as a “novel” oral anticoagulant of choice for multiple indications, especially as more insurance companies cover the use of the FXa inhibitors. As a result of their increased use, the EP is likely to see an increasing number of patients who present with hemorrhagic consequences of the FXa inhibitors, and in turn must be familiar with the properties of this class of anticoagulants—including potential reversal strategies.

Our case of spontaneous retrobulbar hemorrhage may be one of these new patterns of bleeding to be expected from a novel FXa inhibitor. Therefore, it is imperative that EPs consider retrobulbar hemorrhage and other possible bleeding locations in patients on an FXa inhibitor.

A 23-year-old woman presents to dermatology with an itchy rash she has had for several months. Although it manifested on her wrists and finger, the rash moves around and causes itching on her legs, trunk, and arms at various times. It has not affected her breasts or axillae.

The patient has been seen in primary care several times and received the usual topical steroids, antihistamines, and at least three courses of prednisone—none affording much relief.

She denies that anyone else in her household is itching. During her last visit to primary care, they treated her with topical permethrin cream, which was to be left on overnight then washed off. No relief was forthcoming.

EXAMINATION
Scattered areas of faint eczematoid rashes can be seen across her thighs and arms. There are two or three tiny excoriated papules on both volar wrists, but no intact vesicles are observed.

A closer inspection of her palms reveals one tiny linear vesicle on the mid right palm. Vigorous scraping with a #10 blade produces material, which is placed on a slide, covered, filled with potassium hydroxide 10%, and examined under a microscope.

What is the diagnosis?

DISCUSSION
Microscopic evaluation revealed a scabies adult, still moving among the dead cells. The paucity of organisms was probably a result of the prior treatment with permethrin, which confused the issue. When scabies is suspected, there’s only one way to confirm it: Perform a KOH prep. Otherwise, it’s just guesswork.

This particular patient was under the (faulty) impression that because her permethrin treatment failed, she didn’t have scabies. But a single treatment with topical antiscabetic cream is rarely curative. It must be done twice, seven to 10 days apart, to kill organisms newly hatched from eggs lain in the skin. In many cases, oral ivermectin is needed as well.

The itching experienced with scabies is due to an allergic response to scabetic material (droppings, tissue juice). The resultant eczematous rash can be very challenging to deal with.

Three other people live in the patient’s house, and it’s likely that these family members have been infested over several months’ time. They need treatment as well and will require two applications of cream.

Thought should also be given to how the patient acquired the infestation, lest she get it again. This may result in the need to avoid contact with certain people or confront them about their possible role as the source.

TAKE-HOME LEARNING POINTS
• The itching and rash of scabies result from an allergic reaction to the scabetic elements deposited in the skin. This reaction can closely resemble eczema.
• A single treatment of permethrin cream is unlikely to clear scabies. In order to have an effect on the eggs lain in the skin (which hatch in seven to 10 days), two treatments are necessary.
• Many cases of scabies will survive permethrin treatment, so consider adding ivermectin (oral antiscabetic medication) to the regimen.
• All family members living in the same house must be treated at the same time, lest they re-infest one another.
• KOH prep is the gold standard for diagnosing scabies.

A 23-year-old woman presents to dermatology with an itchy rash she has had for several months. Although it manifested on her wrists and finger, the rash moves around and causes itching on her legs, trunk, and arms at various times. It has not affected her breasts or axillae.

The patient has been seen in primary care several times and received the usual topical steroids, antihistamines, and at least three courses of prednisone—none affording much relief.

She denies that anyone else in her household is itching. During her last visit to primary care, they treated her with topical permethrin cream, which was to be left on overnight then washed off. No relief was forthcoming.

EXAMINATION
Scattered areas of faint eczematoid rashes can be seen across her thighs and arms. There are two or three tiny excoriated papules on both volar wrists, but no intact vesicles are observed.

A closer inspection of her palms reveals one tiny linear vesicle on the mid right palm. Vigorous scraping with a #10 blade produces material, which is placed on a slide, covered, filled with potassium hydroxide 10%, and examined under a microscope.

What is the diagnosis?

DISCUSSION
Microscopic evaluation revealed a scabies adult, still moving among the dead cells. The paucity of organisms was probably a result of the prior treatment with permethrin, which confused the issue. When scabies is suspected, there’s only one way to confirm it: Perform a KOH prep. Otherwise, it’s just guesswork.

This particular patient was under the (faulty) impression that because her permethrin treatment failed, she didn’t have scabies. But a single treatment with topical antiscabetic cream is rarely curative. It must be done twice, seven to 10 days apart, to kill organisms newly hatched from eggs lain in the skin. In many cases, oral ivermectin is needed as well.

The itching experienced with scabies is due to an allergic response to scabetic material (droppings, tissue juice). The resultant eczematous rash can be very challenging to deal with.

Three other people live in the patient’s house, and it’s likely that these family members have been infested over several months’ time. They need treatment as well and will require two applications of cream.

Thought should also be given to how the patient acquired the infestation, lest she get it again. This may result in the need to avoid contact with certain people or confront them about their possible role as the source.

TAKE-HOME LEARNING POINTS
• The itching and rash of scabies result from an allergic reaction to the scabetic elements deposited in the skin. This reaction can closely resemble eczema.
• A single treatment of permethrin cream is unlikely to clear scabies. In order to have an effect on the eggs lain in the skin (which hatch in seven to 10 days), two treatments are necessary.
• Many cases of scabies will survive permethrin treatment, so consider adding ivermectin (oral antiscabetic medication) to the regimen.
• All family members living in the same house must be treated at the same time, lest they re-infest one another.
• KOH prep is the gold standard for diagnosing scabies.

A 23-year-old woman presents to dermatology with an itchy rash she has had for several months. Although it manifested on her wrists and finger, the rash moves around and causes itching on her legs, trunk, and arms at various times. It has not affected her breasts or axillae.

The patient has been seen in primary care several times and received the usual topical steroids, antihistamines, and at least three courses of prednisone—none affording much relief.

She denies that anyone else in her household is itching. During her last visit to primary care, they treated her with topical permethrin cream, which was to be left on overnight then washed off. No relief was forthcoming.

EXAMINATION
Scattered areas of faint eczematoid rashes can be seen across her thighs and arms. There are two or three tiny excoriated papules on both volar wrists, but no intact vesicles are observed.

A closer inspection of her palms reveals one tiny linear vesicle on the mid right palm. Vigorous scraping with a #10 blade produces material, which is placed on a slide, covered, filled with potassium hydroxide 10%, and examined under a microscope.

What is the diagnosis?

DISCUSSION
Microscopic evaluation revealed a scabies adult, still moving among the dead cells. The paucity of organisms was probably a result of the prior treatment with permethrin, which confused the issue. When scabies is suspected, there’s only one way to confirm it: Perform a KOH prep. Otherwise, it’s just guesswork.

This particular patient was under the (faulty) impression that because her permethrin treatment failed, she didn’t have scabies. But a single treatment with topical antiscabetic cream is rarely curative. It must be done twice, seven to 10 days apart, to kill organisms newly hatched from eggs lain in the skin. In many cases, oral ivermectin is needed as well.

The itching experienced with scabies is due to an allergic response to scabetic material (droppings, tissue juice). The resultant eczematous rash can be very challenging to deal with.

Three other people live in the patient’s house, and it’s likely that these family members have been infested over several months’ time. They need treatment as well and will require two applications of cream.

Thought should also be given to how the patient acquired the infestation, lest she get it again. This may result in the need to avoid contact with certain people or confront them about their possible role as the source.

TAKE-HOME LEARNING POINTS
• The itching and rash of scabies result from an allergic reaction to the scabetic elements deposited in the skin. This reaction can closely resemble eczema.
• A single treatment of permethrin cream is unlikely to clear scabies. In order to have an effect on the eggs lain in the skin (which hatch in seven to 10 days), two treatments are necessary.
• Many cases of scabies will survive permethrin treatment, so consider adding ivermectin (oral antiscabetic medication) to the regimen.
• All family members living in the same house must be treated at the same time, lest they re-infest one another.
• KOH prep is the gold standard for diagnosing scabies.

A 61-year-old woman without any known medical history presented with a chief complaint of right arm numbness and right-sided scalp numbness that had started 2 days earlier. She described a “pins and needles” sensation in her right upper extremity and right scalp, and said the numbness in her scalp was especially noticeable when she combed her hair. The patient denied any chest pain, shortness of breath, weakness in her arms or legs, headache, or blurred vision.

She said that 1 day prior to the onset of the paresthesias, she woke up fatigued and vomited once. Throughout that day, she had symptoms of nausea and fatigue, and sought treatment at an urgent care center that afternoon. At the urgent care center, she was diagnosed with a “stomach virus” and was given an antiemetic. The next day, her nausea improved, but the paresthesias began in her right hand and scalp. On the third day, the patient went to work, but the persistent paresthesias caused her to visit her primary care physician, who sent her to our ED for further work-up.

The patient said she had been in good health until 3 days ago. She reported no medical problems and was taking no medications. The patient denied smoking or using alcohol; her family history was significant only in that her father had a myocardial infarction (MI) while in his 50s.

On physical examination, the patient was alert, oriented, and in no apparent distress. Her body mass index was 28.3 kg/m². Vital signs were: temperature, 99.2°F; blood pressure, 113/73 mm Hg; heart rate, 93 beats/minute; and respiratory rate, 18 breaths/minute. Oxygen saturation was 95% on room air.

Her head was normocephalic and atraumatic, and her eyes, ears, nose, and throat were normal. Her neck was supple and without jugular vein distension. The cardiac examination revealed normal heart sounds without murmurs, rubs, or gallops. Her lungs were clear without rales, wheezes, or rhonchi. Her abdomen was soft, without tenderness, guarding, or rebound, and she had normal bowel sounds.

Her musculoskeletal examination was normal, with +5/5 strength bilaterally in her upper and lower extremities. The patient’s skin examination also was normal. On neurological examination, her right upper extremity and right side of her face were noted to have decreased sensation via pinprick compared to the left side, but the examination was otherwise normal. The National Institutes of Health Stroke Scale score was 1.

The patient’s electrocardiogram (ECG) showed a normal sinus rhythm (rate, 90 beats/min), a lateral infarct of undetermined age, and a left atrial abnormality. Laboratory evaluation was significant only for a brain natriuretic peptide level of 334 pg/mL, a creatine phosphokinase (CPK) level of 782 IU/L, and a troponin I level of >50 ng/mL (Table). Serial cardiac enzyme levels were obtained and showed a decline of CPK from 782 IU/L to 331 IU/L over the following 36 hours. However, the troponin I levels remained >50 ng/mL for 5 days and then declined to 31.6 ng/mL.

A computed  tomography (CT) scan of the brain without contrast revealed an acute to subacute infarct in the left occipital and left thalamic regions (Figure). A stat transthoracic echocardiogram (ECHO) performed in the ED revealed a dilated left ventricle with an ejection fraction of 20% to 25%, along with a hypokinetic anterolateral wall and an akinetic inferolateral wall. No atrial thrombus was visible on the ECHO. Doppler studies of the patient’s lower extremities were negative for deep vein thrombosis. Magnetic resonance imaging of her brain showed an infarct in the posterior circulation distribution involving the left occipital lobes and small areas in the left thalamic and right parietal-occipital regions. Hemorrhagic conversion of the left occipital infarct without mass effect was also noted. The patient was admitted to the neurological intensive care unit for frequent neurological examinations and close monitoring for worsening cerebral hemorrhage.

When the patient had still been in the ED, cardiology services were consulted; the cardiologist initiated a heparin drip with close monitoring of the coagulation studies. Cardiac catheterization was not done immediately because the ECG did not show acute ST elevations. The day after her presentation to the ED, the patient underwent a primary percutaneous coronary catheterization and was found to have a small rudimentary left anterior descending artery, with only small branches supplying the septal region. The right circumflex artery was very large and was supplying the lateral wall. No stents were placed during this procedure. A transesophageal ECHO (TEE) showed no evidence of a left atrial appendage thrombus.

The patient experienced an episode of coffee ground emesis while undergoing the TEE. Her hemoglobin declined from 11.9 g/dL to 7.9 g/dL, which led to a transfusion of 2 U  of packed red blood cells and platelets. Heparin was discontinued and a proton pump inhibitor was started; however, no endoscopy was done at that time.

Throughout her stay, the patient was continuously monitored, but no evidence of arrhythmia or atrial fibrillation was found. Upon discharge, the neurologist recommended the patient receive clopidogrel and aspirin therapy for 3 months with subsequent aspirin monotherapy afterward. The patient was discharged after 10 days in the hospital.

Discussion

Although she had an MI, the patient presented here did not experience any chest pain. Her chief complaint in the ED was paresthesias related to her concomitant stroke, and only on further probing did she describe the additional symptoms of fatigability and vomiting.

Since heart disease and stroke share common risk factors and pathophysiology, acute cerebral ischemic events may happen concurrently with MIs. In a review of studies that included approximately 2,900 patients who had an acute stroke, Kerr et al¹ found that 20% had elevated troponin levels within 7 days of the stroke. In 2013, the American Heart Association and American Stroke Association published guidelines advising that all patients who present with acute cerebral ischemia have an emergent ECG and baseline troponin level.² This was in response to evidence that even low positive troponin levels have been associated with an increased risk of mortality.³ Positive troponin levels are especially important because fatal and nonfatal stroke post-MI events have been found to be increasing in frequency for women, even though there has been a significant overall reduction in post-MI mortality.⁴ Patients who have an ischemic stroke concurrently with an acute MI or soon after have an overall poorer clinical prognosis.⁵

For emergency physicians (EPs),  this is a “chicken or the egg” scenario. It is difficult to determine which came first: the MI or the cerebral ischemia. Similar risk factors can result in an acute embolic event from revascularization, atrial fibrillation without proper anticoagulation, or a poorly functioning left ventricle.⁶ It is important to remember that regardless of the order of occurrence, the incidence of ischemic stroke is markedly increased in conjunction with an acute MI.⁷ Several theories have been advanced regarding the relationship between ischemic stroke and acute MI. One theory proposes that elevated troponin levels could be related to a large catecholamine release after a cerebral ischemic stroke, resulting in subsequent myocardial injury or cardiomyopathy.⁷ However, this theory remains controversial.

Management

The major consideration for the EP is whether or not to give thrombolytics to a patient who presents with concomitant acute MI and ischemic stroke. An acute MI within the 3 months preceding an acute stroke is considered a relative contraindication for intravenous tissue plasminogen activator (tPA).⁸ It has also been found, albeit rarely, that there is an increased risk of cardiac rupture or tamponade due to the breakdown of the fibrin clot within the necrotic cardiac tissue.⁸

How should patients with stroke complicated by acute cardiac compromise be managed in the ED? One acute vascular event cannot be ignored while addressing the other. There are no evidence-based guidelines for the management of patients who present with this picture.⁸ In addition, no published clinical studies have focused on the decision-making process for these patients.⁸

Immediate percutaneous coronary intervention for the MI performed on such patients would prevent the use of tPA for the acute stroke. Though any anticoagulation increases the risk for postischemic cerebral hemorrhage, heparin is necessary to prevent the formation of a left ventricle thrombus.⁷ Alternately, mechanical thrombectomy and cardiac catheterization may be combined as emergent treatments for these patients, but performing these two procedures simultaneously is not widely available.

For a patient who presents to the ED within both the cardiac and stroke treatment windows, tPA might be a viable option, and the only one readily valuable.⁸ However, the EP must be mindful of the varying dosages of tPA and means of administration for different thrombosis sites. Also, care must be taken when treating a patient with dual or triple antiplatelet therapy because of the increased risk of hemorrhage.⁹ Currently, no safe standardized regimens have been established, and further trials need to be performed.¹⁰

If the patient in this case report had presented at our ED with only signs and symptoms of an MI, typically she would have been treated with heparin, aspirin, and an urgent cardiac catheterization. If she had presented with only signs and symptoms of a stroke, she would have been treated with full-dose aspirin and worked up from a neurological perspective. Because she had signs and symptoms of both, she presented a dilemma. She was initially treated with heparin to prevent a thrombus formation, but then later changed to only clopidogrel and aspirin to prevent further episodes of coffee ground emesis or worsening hemorrhagic conversion.

Conclusion

Common risk factors for cardiac and cerebral ischemic events may result in a patient presenting with both acute MI and an acute cerebral ischemic event. There have not been sufficient clinical studies to determine the best decision-making process for these patients. Therefore, patients with this complicated presentation must be assessed on an individual basis. Current treatment options are varied and are based according to history of the present illness, time of presentation to the ED, and the available resources within the hospital.

A 61-year-old woman without any known medical history presented with a chief complaint of right arm numbness and right-sided scalp numbness that had started 2 days earlier. She described a “pins and needles” sensation in her right upper extremity and right scalp, and said the numbness in her scalp was especially noticeable when she combed her hair. The patient denied any chest pain, shortness of breath, weakness in her arms or legs, headache, or blurred vision.

She said that 1 day prior to the onset of the paresthesias, she woke up fatigued and vomited once. Throughout that day, she had symptoms of nausea and fatigue, and sought treatment at an urgent care center that afternoon. At the urgent care center, she was diagnosed with a “stomach virus” and was given an antiemetic. The next day, her nausea improved, but the paresthesias began in her right hand and scalp. On the third day, the patient went to work, but the persistent paresthesias caused her to visit her primary care physician, who sent her to our ED for further work-up.

The patient said she had been in good health until 3 days ago. She reported no medical problems and was taking no medications. The patient denied smoking or using alcohol; her family history was significant only in that her father had a myocardial infarction (MI) while in his 50s.

On physical examination, the patient was alert, oriented, and in no apparent distress. Her body mass index was 28.3 kg/m². Vital signs were: temperature, 99.2°F; blood pressure, 113/73 mm Hg; heart rate, 93 beats/minute; and respiratory rate, 18 breaths/minute. Oxygen saturation was 95% on room air.

Her head was normocephalic and atraumatic, and her eyes, ears, nose, and throat were normal. Her neck was supple and without jugular vein distension. The cardiac examination revealed normal heart sounds without murmurs, rubs, or gallops. Her lungs were clear without rales, wheezes, or rhonchi. Her abdomen was soft, without tenderness, guarding, or rebound, and she had normal bowel sounds.

Her musculoskeletal examination was normal, with +5/5 strength bilaterally in her upper and lower extremities. The patient’s skin examination also was normal. On neurological examination, her right upper extremity and right side of her face were noted to have decreased sensation via pinprick compared to the left side, but the examination was otherwise normal. The National Institutes of Health Stroke Scale score was 1.

The patient’s electrocardiogram (ECG) showed a normal sinus rhythm (rate, 90 beats/min), a lateral infarct of undetermined age, and a left atrial abnormality. Laboratory evaluation was significant only for a brain natriuretic peptide level of 334 pg/mL, a creatine phosphokinase (CPK) level of 782 IU/L, and a troponin I level of >50 ng/mL (Table). Serial cardiac enzyme levels were obtained and showed a decline of CPK from 782 IU/L to 331 IU/L over the following 36 hours. However, the troponin I levels remained >50 ng/mL for 5 days and then declined to 31.6 ng/mL.

A computed  tomography (CT) scan of the brain without contrast revealed an acute to subacute infarct in the left occipital and left thalamic regions (Figure). A stat transthoracic echocardiogram (ECHO) performed in the ED revealed a dilated left ventricle with an ejection fraction of 20% to 25%, along with a hypokinetic anterolateral wall and an akinetic inferolateral wall. No atrial thrombus was visible on the ECHO. Doppler studies of the patient’s lower extremities were negative for deep vein thrombosis. Magnetic resonance imaging of her brain showed an infarct in the posterior circulation distribution involving the left occipital lobes and small areas in the left thalamic and right parietal-occipital regions. Hemorrhagic conversion of the left occipital infarct without mass effect was also noted. The patient was admitted to the neurological intensive care unit for frequent neurological examinations and close monitoring for worsening cerebral hemorrhage.

When the patient had still been in the ED, cardiology services were consulted; the cardiologist initiated a heparin drip with close monitoring of the coagulation studies. Cardiac catheterization was not done immediately because the ECG did not show acute ST elevations. The day after her presentation to the ED, the patient underwent a primary percutaneous coronary catheterization and was found to have a small rudimentary left anterior descending artery, with only small branches supplying the septal region. The right circumflex artery was very large and was supplying the lateral wall. No stents were placed during this procedure. A transesophageal ECHO (TEE) showed no evidence of a left atrial appendage thrombus.

The patient experienced an episode of coffee ground emesis while undergoing the TEE. Her hemoglobin declined from 11.9 g/dL to 7.9 g/dL, which led to a transfusion of 2 U  of packed red blood cells and platelets. Heparin was discontinued and a proton pump inhibitor was started; however, no endoscopy was done at that time.

Throughout her stay, the patient was continuously monitored, but no evidence of arrhythmia or atrial fibrillation was found. Upon discharge, the neurologist recommended the patient receive clopidogrel and aspirin therapy for 3 months with subsequent aspirin monotherapy afterward. The patient was discharged after 10 days in the hospital.

Discussion

Although she had an MI, the patient presented here did not experience any chest pain. Her chief complaint in the ED was paresthesias related to her concomitant stroke, and only on further probing did she describe the additional symptoms of fatigability and vomiting.

Since heart disease and stroke share common risk factors and pathophysiology, acute cerebral ischemic events may happen concurrently with MIs. In a review of studies that included approximately 2,900 patients who had an acute stroke, Kerr et al¹ found that 20% had elevated troponin levels within 7 days of the stroke. In 2013, the American Heart Association and American Stroke Association published guidelines advising that all patients who present with acute cerebral ischemia have an emergent ECG and baseline troponin level.² This was in response to evidence that even low positive troponin levels have been associated with an increased risk of mortality.³ Positive troponin levels are especially important because fatal and nonfatal stroke post-MI events have been found to be increasing in frequency for women, even though there has been a significant overall reduction in post-MI mortality.⁴ Patients who have an ischemic stroke concurrently with an acute MI or soon after have an overall poorer clinical prognosis.⁵

For emergency physicians (EPs),  this is a “chicken or the egg” scenario. It is difficult to determine which came first: the MI or the cerebral ischemia. Similar risk factors can result in an acute embolic event from revascularization, atrial fibrillation without proper anticoagulation, or a poorly functioning left ventricle.⁶ It is important to remember that regardless of the order of occurrence, the incidence of ischemic stroke is markedly increased in conjunction with an acute MI.⁷ Several theories have been advanced regarding the relationship between ischemic stroke and acute MI. One theory proposes that elevated troponin levels could be related to a large catecholamine release after a cerebral ischemic stroke, resulting in subsequent myocardial injury or cardiomyopathy.⁷ However, this theory remains controversial.

Management

The major consideration for the EP is whether or not to give thrombolytics to a patient who presents with concomitant acute MI and ischemic stroke. An acute MI within the 3 months preceding an acute stroke is considered a relative contraindication for intravenous tissue plasminogen activator (tPA).⁸ It has also been found, albeit rarely, that there is an increased risk of cardiac rupture or tamponade due to the breakdown of the fibrin clot within the necrotic cardiac tissue.⁸

How should patients with stroke complicated by acute cardiac compromise be managed in the ED? One acute vascular event cannot be ignored while addressing the other. There are no evidence-based guidelines for the management of patients who present with this picture.⁸ In addition, no published clinical studies have focused on the decision-making process for these patients.⁸

Immediate percutaneous coronary intervention for the MI performed on such patients would prevent the use of tPA for the acute stroke. Though any anticoagulation increases the risk for postischemic cerebral hemorrhage, heparin is necessary to prevent the formation of a left ventricle thrombus.⁷ Alternately, mechanical thrombectomy and cardiac catheterization may be combined as emergent treatments for these patients, but performing these two procedures simultaneously is not widely available.

For a patient who presents to the ED within both the cardiac and stroke treatment windows, tPA might be a viable option, and the only one readily valuable.⁸ However, the EP must be mindful of the varying dosages of tPA and means of administration for different thrombosis sites. Also, care must be taken when treating a patient with dual or triple antiplatelet therapy because of the increased risk of hemorrhage.⁹ Currently, no safe standardized regimens have been established, and further trials need to be performed.¹⁰

If the patient in this case report had presented at our ED with only signs and symptoms of an MI, typically she would have been treated with heparin, aspirin, and an urgent cardiac catheterization. If she had presented with only signs and symptoms of a stroke, she would have been treated with full-dose aspirin and worked up from a neurological perspective. Because she had signs and symptoms of both, she presented a dilemma. She was initially treated with heparin to prevent a thrombus formation, but then later changed to only clopidogrel and aspirin to prevent further episodes of coffee ground emesis or worsening hemorrhagic conversion.

Conclusion

Common risk factors for cardiac and cerebral ischemic events may result in a patient presenting with both acute MI and an acute cerebral ischemic event. There have not been sufficient clinical studies to determine the best decision-making process for these patients. Therefore, patients with this complicated presentation must be assessed on an individual basis. Current treatment options are varied and are based according to history of the present illness, time of presentation to the ED, and the available resources within the hospital.

A 61-year-old woman without any known medical history presented with a chief complaint of right arm numbness and right-sided scalp numbness that had started 2 days earlier. She described a “pins and needles” sensation in her right upper extremity and right scalp, and said the numbness in her scalp was especially noticeable when she combed her hair. The patient denied any chest pain, shortness of breath, weakness in her arms or legs, headache, or blurred vision.

She said that 1 day prior to the onset of the paresthesias, she woke up fatigued and vomited once. Throughout that day, she had symptoms of nausea and fatigue, and sought treatment at an urgent care center that afternoon. At the urgent care center, she was diagnosed with a “stomach virus” and was given an antiemetic. The next day, her nausea improved, but the paresthesias began in her right hand and scalp. On the third day, the patient went to work, but the persistent paresthesias caused her to visit her primary care physician, who sent her to our ED for further work-up.

The patient said she had been in good health until 3 days ago. She reported no medical problems and was taking no medications. The patient denied smoking or using alcohol; her family history was significant only in that her father had a myocardial infarction (MI) while in his 50s.

On physical examination, the patient was alert, oriented, and in no apparent distress. Her body mass index was 28.3 kg/m². Vital signs were: temperature, 99.2°F; blood pressure, 113/73 mm Hg; heart rate, 93 beats/minute; and respiratory rate, 18 breaths/minute. Oxygen saturation was 95% on room air.

Her head was normocephalic and atraumatic, and her eyes, ears, nose, and throat were normal. Her neck was supple and without jugular vein distension. The cardiac examination revealed normal heart sounds without murmurs, rubs, or gallops. Her lungs were clear without rales, wheezes, or rhonchi. Her abdomen was soft, without tenderness, guarding, or rebound, and she had normal bowel sounds.

Her musculoskeletal examination was normal, with +5/5 strength bilaterally in her upper and lower extremities. The patient’s skin examination also was normal. On neurological examination, her right upper extremity and right side of her face were noted to have decreased sensation via pinprick compared to the left side, but the examination was otherwise normal. The National Institutes of Health Stroke Scale score was 1.

The patient’s electrocardiogram (ECG) showed a normal sinus rhythm (rate, 90 beats/min), a lateral infarct of undetermined age, and a left atrial abnormality. Laboratory evaluation was significant only for a brain natriuretic peptide level of 334 pg/mL, a creatine phosphokinase (CPK) level of 782 IU/L, and a troponin I level of >50 ng/mL (Table). Serial cardiac enzyme levels were obtained and showed a decline of CPK from 782 IU/L to 331 IU/L over the following 36 hours. However, the troponin I levels remained >50 ng/mL for 5 days and then declined to 31.6 ng/mL.

A computed  tomography (CT) scan of the brain without contrast revealed an acute to subacute infarct in the left occipital and left thalamic regions (Figure). A stat transthoracic echocardiogram (ECHO) performed in the ED revealed a dilated left ventricle with an ejection fraction of 20% to 25%, along with a hypokinetic anterolateral wall and an akinetic inferolateral wall. No atrial thrombus was visible on the ECHO. Doppler studies of the patient’s lower extremities were negative for deep vein thrombosis. Magnetic resonance imaging of her brain showed an infarct in the posterior circulation distribution involving the left occipital lobes and small areas in the left thalamic and right parietal-occipital regions. Hemorrhagic conversion of the left occipital infarct without mass effect was also noted. The patient was admitted to the neurological intensive care unit for frequent neurological examinations and close monitoring for worsening cerebral hemorrhage.

When the patient had still been in the ED, cardiology services were consulted; the cardiologist initiated a heparin drip with close monitoring of the coagulation studies. Cardiac catheterization was not done immediately because the ECG did not show acute ST elevations. The day after her presentation to the ED, the patient underwent a primary percutaneous coronary catheterization and was found to have a small rudimentary left anterior descending artery, with only small branches supplying the septal region. The right circumflex artery was very large and was supplying the lateral wall. No stents were placed during this procedure. A transesophageal ECHO (TEE) showed no evidence of a left atrial appendage thrombus.

The patient experienced an episode of coffee ground emesis while undergoing the TEE. Her hemoglobin declined from 11.9 g/dL to 7.9 g/dL, which led to a transfusion of 2 U  of packed red blood cells and platelets. Heparin was discontinued and a proton pump inhibitor was started; however, no endoscopy was done at that time.

Throughout her stay, the patient was continuously monitored, but no evidence of arrhythmia or atrial fibrillation was found. Upon discharge, the neurologist recommended the patient receive clopidogrel and aspirin therapy for 3 months with subsequent aspirin monotherapy afterward. The patient was discharged after 10 days in the hospital.

Discussion

Although she had an MI, the patient presented here did not experience any chest pain. Her chief complaint in the ED was paresthesias related to her concomitant stroke, and only on further probing did she describe the additional symptoms of fatigability and vomiting.

Since heart disease and stroke share common risk factors and pathophysiology, acute cerebral ischemic events may happen concurrently with MIs. In a review of studies that included approximately 2,900 patients who had an acute stroke, Kerr et al¹ found that 20% had elevated troponin levels within 7 days of the stroke. In 2013, the American Heart Association and American Stroke Association published guidelines advising that all patients who present with acute cerebral ischemia have an emergent ECG and baseline troponin level.² This was in response to evidence that even low positive troponin levels have been associated with an increased risk of mortality.³ Positive troponin levels are especially important because fatal and nonfatal stroke post-MI events have been found to be increasing in frequency for women, even though there has been a significant overall reduction in post-MI mortality.⁴ Patients who have an ischemic stroke concurrently with an acute MI or soon after have an overall poorer clinical prognosis.⁵

For emergency physicians (EPs),  this is a “chicken or the egg” scenario. It is difficult to determine which came first: the MI or the cerebral ischemia. Similar risk factors can result in an acute embolic event from revascularization, atrial fibrillation without proper anticoagulation, or a poorly functioning left ventricle.⁶ It is important to remember that regardless of the order of occurrence, the incidence of ischemic stroke is markedly increased in conjunction with an acute MI.⁷ Several theories have been advanced regarding the relationship between ischemic stroke and acute MI. One theory proposes that elevated troponin levels could be related to a large catecholamine release after a cerebral ischemic stroke, resulting in subsequent myocardial injury or cardiomyopathy.⁷ However, this theory remains controversial.

Management

The major consideration for the EP is whether or not to give thrombolytics to a patient who presents with concomitant acute MI and ischemic stroke. An acute MI within the 3 months preceding an acute stroke is considered a relative contraindication for intravenous tissue plasminogen activator (tPA).⁸ It has also been found, albeit rarely, that there is an increased risk of cardiac rupture or tamponade due to the breakdown of the fibrin clot within the necrotic cardiac tissue.⁸

How should patients with stroke complicated by acute cardiac compromise be managed in the ED? One acute vascular event cannot be ignored while addressing the other. There are no evidence-based guidelines for the management of patients who present with this picture.⁸ In addition, no published clinical studies have focused on the decision-making process for these patients.⁸

Immediate percutaneous coronary intervention for the MI performed on such patients would prevent the use of tPA for the acute stroke. Though any anticoagulation increases the risk for postischemic cerebral hemorrhage, heparin is necessary to prevent the formation of a left ventricle thrombus.⁷ Alternately, mechanical thrombectomy and cardiac catheterization may be combined as emergent treatments for these patients, but performing these two procedures simultaneously is not widely available.

For a patient who presents to the ED within both the cardiac and stroke treatment windows, tPA might be a viable option, and the only one readily valuable.⁸ However, the EP must be mindful of the varying dosages of tPA and means of administration for different thrombosis sites. Also, care must be taken when treating a patient with dual or triple antiplatelet therapy because of the increased risk of hemorrhage.⁹ Currently, no safe standardized regimens have been established, and further trials need to be performed.¹⁰

If the patient in this case report had presented at our ED with only signs and symptoms of an MI, typically she would have been treated with heparin, aspirin, and an urgent cardiac catheterization. If she had presented with only signs and symptoms of a stroke, she would have been treated with full-dose aspirin and worked up from a neurological perspective. Because she had signs and symptoms of both, she presented a dilemma. She was initially treated with heparin to prevent a thrombus formation, but then later changed to only clopidogrel and aspirin to prevent further episodes of coffee ground emesis or worsening hemorrhagic conversion.

Conclusion

Common risk factors for cardiac and cerebral ischemic events may result in a patient presenting with both acute MI and an acute cerebral ischemic event. There have not been sufficient clinical studies to determine the best decision-making process for these patients. Therefore, patients with this complicated presentation must be assessed on an individual basis. Current treatment options are varied and are based according to history of the present illness, time of presentation to the ED, and the available resources within the hospital.

Internal carotid artery dissection (ICAD) is an uncommon cause of stroke that typically occurs in the setting of (often minor) trauma but can also occur spontaneously. Patients with ICAD typically present with ipsilateral head, face, or neck pain. In approximately half of ICAD cases, an acute partial, painful Horner syndrome is present on examination. Although computed tomography angiography (CTA) is currently the imaging study of choice, magnetic resonance imaging/magnetic resonance angiography (MRI/MRA) and Doppler ultrasound can also be used. Management options include thrombolysis, antiplatelet or anticoagulation therapy, and endovascular or surgical intervention.

Case

A 56-year-old man with a history of migraines presented to the ED with a chief complaint of a 4-day history of right-sided headache. He stated that the pain felt different from his usual migraines and was located behind his right eye. Prior to presentation at the ED, the patient had initially visited an urgent care facility for evaluation. The physician who evaluated the patient at the urgent care facility noted the patient’s left eye appeared dilated and referred him to the ED for evaluation.

The patient further stated that the day prior to presentation, one of his friends had also remarked that the patient’s left eye appeared to be enlarged. The patient denied any visual disturbances, focal weakness, nausea, vomiting, neck pain, or stiffness. His medical history was significant for paroxysmal atrial flutter and hypertension. Regarding medications, the patient was taking dronedarone, clonazepam, omeprazole, and metoprolol.

On physical examination, the patient’s vital signs were: blood pressure, 162/109 mm Hg; heart rate, 85 beats/minute and regular; respiratory rate, 18 breaths/minute; and temperature, 98.6°F. Oxygen saturation was 98% on room air. The patient appeared to be in no acute distress. Ocular examination revealed a dilated left pupil of approximately 5 to 6 mm, and a right pupil measuring approximately 3 mm. Both pupils reacted to light, and the extraocular muscles were intact. The patient’s face appeared symmetrical and had intact sensation. He had normal speech, midline tongue, and good bilateral shoulder shrug. The neck examination revealed normal range of motion with full flexion, without jugular vein distention, lymphadenopathy, or palpable thyroid. The cardiovascular, lung, and abdominal examinations were all normal. The neurological examination showed the patient to be awake, alert, and oriented to person, place, and time. He exhibited 5/5 motor strength in all four extremities, normal gait, and normal finger-to-nose performance; his reflexes were 2+ and symmetrical.

The emergency physician (EP) ordered a stat noncontrast CT scan of the head, complete blood count (CBC), and basic metabolic panel (BMP). The CT scan of the head was interpreted by the radiologist as “no acute intracranial abnormality,” and the CBC and the BMP were normal. Since the EP was concerned about a carotid artery aneurysm or dissection, he ordered a CTA of the head and neck (Figures 1 and 2). The CTA was read as:

Long segment dissection of postbulbar cervical segment of right internal carotid artery, very likely extending into the intracranial segment with critical stenosis at the junction of the high cervical segment and proximal petrous segment. Preserved runoff circulation to the anterior and middle cerebral arteries with robust capacity for collateral support in the context of patent anterior and posterior communicating arteries.

Based on the radiology report, the EP consulted with vascular surgery services, and ordered a Doppler study of the ICAs. The Doppler study demonstrated “arterial thrombus in the right distal extracranial internal carotid artery with hemodynamics suggestive of a distal occlusion/significant obstruction.” The patient was started on an intravenous (IV) heparin drip and admitted to the hospital. Three days later he experienced sudden onset of left arm weakness. An emergent CTA of the head and neck revealed an embolic occlusion of mid-to-distal M1 segment of the right middle cerebral artery. The patient was immediately evaluated by interventional radiology for possible clot removal; however, based on his rapid neurological improvement, he was instead treated medically with aspirin and clopidogrel and continued to show significant neurological improvement. He was discharged home on hospital day 8 on both antiplatelet agents with minimal neurological deficit.

Discussion

Even though ICAD accounts for only 1% to 2% of all strokes, it is responsible for 10% to 25% of strokes in young and middle-aged adults.^1-3 The peak incidence for ICAD is in the fifth decade, and it affects men and women equally.⁴ The extracranial portion of the ICA is the most commonly affected vessel (>90%); dissections of the intracranial portion are associated with greater neurological deficits and have a poorer prognosis.^2,5 Cerebral ischemia resulting from a dissection of the extracranial ICA may occur days to weeks after the onset of local symptoms such as head or neck pain, Horner syndrome, or tinnitus.⁵

In ICAD, a tear in the artery wall causes blood to enter the tunica media of the vessel, forming an intramural hematoma.^2,6 This may result in either stenosis of the lumen of the vessel from the enlarging hematoma or an outward aneurysmal dilatation of the vessel that compresses surrounding structures.^2,6 Subsequent cerebral ischemia is the result of either arterial embolism or hemodynamic compromise from vessel stenosis.^2,3

Causes

Dissections often occur secondary to trauma, though the severity of the trauma may be quite minor.^2,6 Seemingly trivial mechanisms that have been associated with dissections include nose blowing, coughing, sudden neck turning, and prolonged telephone conversations. Other known causes are motor vehicle accidents and chiropractic maneuvers. Inherited connective tissue disorders, including Ehlers-Danlos syndrome, Marfan syndrome, fibromuscular dysplasia, and osteogenesis imperfecta, are associated with spontaneous ICAD.^2,6

Symptoms

The most common presenting symptom of carotid dissection in approximately two-thirds of patients is ipsilateral head, face, or neck pain,^2,6 typically described as sharp, constant, and nonthrobbing. Patients report a subjective bruit in 21% to 39% of cases.⁷ An acute partial painful Horner syndrome is strongly associated with ICAD, but is present in fewer than half of such patients.⁶ It is characterized by miosis and ptosis and is the result of compression of the ascending sympathetic fibers that travel alongside the ICA within the carotid sheath. Anhidrosis is not present because the fibers for sweat function in the face travel along the external carotid artery.²

Differential Diagnosis

While there is overlap between strokes caused by ICAD versus plaque, some features can help guide the clinician. Symptomatic carotid disease will frequently present with a history of one or more transient ischemic attacks characterized by focal neurological dysfunction or transient monocular blindness—typically within the previous 6 months.⁸ This history is not usually present in patients with ICAD. Secondly, pain is a much more prominent symptom in ICAD compared to patients with severe carotid atherosclerosis. The history of trauma, even minor, should make dissection higher on the differential diagnosis. Fortunately, the imaging studies to evaluate for these two diseases are the same.

Assessing Pupillary Asymmetry and Ptosis

Careful attention must be paid to assessing a patient for pupillary asymmetry. In a patient with anisocoria, determining the abnormal pupil may require examination of the patient in both bright and dark lighting conditions. The first step is to examine the patient’s pupils under normal lighting conditions. The next step is to assess each pupil’s response to shining a bright light in each eye. The abnormal pupil is the pupil that does not respond well or at all to bright light shone directly in the eye. If the anisocoria is greatest in bright light, the larger pupil is the abnormal pupil. When the anisocoria is greater in dark conditions, the smaller pupil is the abnormal pupil. In this case, the patient’s abnormal pupil was incorrectly diagnosed as the contralateral larger pupil (ie, left)—highlighting the importance of performing a complete pupillary examination in all patients presenting with neurological symptoms.⁹

Furthermore, as demonstrated in this case, ptosis in a patient with Horner syndrome caused by an ICAD can be subtle. The ptosis is the result of paralysis of Müeller’s muscle, which is innervated by the sympathetic pathway. The levator palpebrae superioris, which causes the more profound ptosis seen in third nerve palsies, is unaffected.¹⁰

Imaging Studies

Once the diagnosis of ICAD is suspected, appropriate vascular imaging must be obtained. Digital subtraction angiography has historically been the gold standard for vascular imaging of the neck vessels, but it has largely been replaced by less invasive and more readily available imaging modalities such as CTA and MRI/MRA.¹¹

Computed Tomography Angiography. This is a widely available, rapid imaging choice and has a sensitivity of 80% to 95% in the detection of ICAD.⁷ It has a greater ability than MRI to identify dissection features such as intimal flaps, pseudoaneurysms, and high-grade stenosis versus occlusion. One of its disadvantages is the need for iodinated contrast, which can limit the ability to obtain the test in those with renal disease or patients with true allergies to IV contrast material. In addition, a mural hematoma can be mistaken for a noncalcified atherosclerotic plaque in the vessel lumen.⁶

Magnetic Resonance Imaging and Magnetic Resonance Angiography. Both MRI and MRA are also frequently used to diagnose ICAD. The intramural hematoma displays a hyperdense signal on T1-weighted images and has a characteristic crescent shape adjacent to the lumen.¹¹ Magnetic resonance imaging studies are also sensitive in detecting cerebral ischemia resulting from the dissection. However, the sensitivity of MRI/MRA is highest 2 days after the dissection has occurred.²

Doppler Ultrasound. This is another imaging modality used to detect ICAD—one that is noninvasive, less expensive, requires no contrast material, and is widely available. Limitations of Doppler ultrasound include the inability to scan the distal ICA and a lower sensitivity in detecting dissections that cause low-grade stenosis.² It is more commonly used for follow-up monitoring of dissections.

Management

There are several options for managing ICAD. In patients with unstable lesions, progressing neurological deficit, or further strokes, endovascular stenting has been shown to have a technical success rate of 99% and a procedural complication rate of 1.3%.¹² Similarly, if the patient exhibits symptoms of cerebral ischemia, severe narrowing of the arterial lumen, or an unstable plaque, IV heparin is frequently used, followed by warfarin.¹³ However, since the majority of carotid and vertebral artery dissections heal spontaneously,¹⁴ antithrombotic therapies, including aspirin, clopidogrel or warfarin, are often prescribed to prevent thromboembolic complications.

Conclusion

Diagnosing ICAD requires knowledge of the typical history and presenting features of the disease. Careful attention to the ocular examination must be undertaken in any patient presenting with headache or face or neck pain, because the findings can be subtle. In a patient in whom ICAD is suspected, imaging with CTA or MRI/MRA should be performed. Early consultation with vascular surgery services  can help determine the most appropriate treatment strategy.

Internal carotid artery dissection (ICAD) is an uncommon cause of stroke that typically occurs in the setting of (often minor) trauma but can also occur spontaneously. Patients with ICAD typically present with ipsilateral head, face, or neck pain. In approximately half of ICAD cases, an acute partial, painful Horner syndrome is present on examination. Although computed tomography angiography (CTA) is currently the imaging study of choice, magnetic resonance imaging/magnetic resonance angiography (MRI/MRA) and Doppler ultrasound can also be used. Management options include thrombolysis, antiplatelet or anticoagulation therapy, and endovascular or surgical intervention.

Case

A 56-year-old man with a history of migraines presented to the ED with a chief complaint of a 4-day history of right-sided headache. He stated that the pain felt different from his usual migraines and was located behind his right eye. Prior to presentation at the ED, the patient had initially visited an urgent care facility for evaluation. The physician who evaluated the patient at the urgent care facility noted the patient’s left eye appeared dilated and referred him to the ED for evaluation.

The patient further stated that the day prior to presentation, one of his friends had also remarked that the patient’s left eye appeared to be enlarged. The patient denied any visual disturbances, focal weakness, nausea, vomiting, neck pain, or stiffness. His medical history was significant for paroxysmal atrial flutter and hypertension. Regarding medications, the patient was taking dronedarone, clonazepam, omeprazole, and metoprolol.

On physical examination, the patient’s vital signs were: blood pressure, 162/109 mm Hg; heart rate, 85 beats/minute and regular; respiratory rate, 18 breaths/minute; and temperature, 98.6°F. Oxygen saturation was 98% on room air. The patient appeared to be in no acute distress. Ocular examination revealed a dilated left pupil of approximately 5 to 6 mm, and a right pupil measuring approximately 3 mm. Both pupils reacted to light, and the extraocular muscles were intact. The patient’s face appeared symmetrical and had intact sensation. He had normal speech, midline tongue, and good bilateral shoulder shrug. The neck examination revealed normal range of motion with full flexion, without jugular vein distention, lymphadenopathy, or palpable thyroid. The cardiovascular, lung, and abdominal examinations were all normal. The neurological examination showed the patient to be awake, alert, and oriented to person, place, and time. He exhibited 5/5 motor strength in all four extremities, normal gait, and normal finger-to-nose performance; his reflexes were 2+ and symmetrical.

The emergency physician (EP) ordered a stat noncontrast CT scan of the head, complete blood count (CBC), and basic metabolic panel (BMP). The CT scan of the head was interpreted by the radiologist as “no acute intracranial abnormality,” and the CBC and the BMP were normal. Since the EP was concerned about a carotid artery aneurysm or dissection, he ordered a CTA of the head and neck (Figures 1 and 2). The CTA was read as:

Long segment dissection of postbulbar cervical segment of right internal carotid artery, very likely extending into the intracranial segment with critical stenosis at the junction of the high cervical segment and proximal petrous segment. Preserved runoff circulation to the anterior and middle cerebral arteries with robust capacity for collateral support in the context of patent anterior and posterior communicating arteries.

Based on the radiology report, the EP consulted with vascular surgery services, and ordered a Doppler study of the ICAs. The Doppler study demonstrated “arterial thrombus in the right distal extracranial internal carotid artery with hemodynamics suggestive of a distal occlusion/significant obstruction.” The patient was started on an intravenous (IV) heparin drip and admitted to the hospital. Three days later he experienced sudden onset of left arm weakness. An emergent CTA of the head and neck revealed an embolic occlusion of mid-to-distal M1 segment of the right middle cerebral artery. The patient was immediately evaluated by interventional radiology for possible clot removal; however, based on his rapid neurological improvement, he was instead treated medically with aspirin and clopidogrel and continued to show significant neurological improvement. He was discharged home on hospital day 8 on both antiplatelet agents with minimal neurological deficit.

Discussion

Even though ICAD accounts for only 1% to 2% of all strokes, it is responsible for 10% to 25% of strokes in young and middle-aged adults.^1-3 The peak incidence for ICAD is in the fifth decade, and it affects men and women equally.⁴ The extracranial portion of the ICA is the most commonly affected vessel (>90%); dissections of the intracranial portion are associated with greater neurological deficits and have a poorer prognosis.^2,5 Cerebral ischemia resulting from a dissection of the extracranial ICA may occur days to weeks after the onset of local symptoms such as head or neck pain, Horner syndrome, or tinnitus.⁵

In ICAD, a tear in the artery wall causes blood to enter the tunica media of the vessel, forming an intramural hematoma.^2,6 This may result in either stenosis of the lumen of the vessel from the enlarging hematoma or an outward aneurysmal dilatation of the vessel that compresses surrounding structures.^2,6 Subsequent cerebral ischemia is the result of either arterial embolism or hemodynamic compromise from vessel stenosis.^2,3

Causes

Dissections often occur secondary to trauma, though the severity of the trauma may be quite minor.^2,6 Seemingly trivial mechanisms that have been associated with dissections include nose blowing, coughing, sudden neck turning, and prolonged telephone conversations. Other known causes are motor vehicle accidents and chiropractic maneuvers. Inherited connective tissue disorders, including Ehlers-Danlos syndrome, Marfan syndrome, fibromuscular dysplasia, and osteogenesis imperfecta, are associated with spontaneous ICAD.^2,6

Symptoms

The most common presenting symptom of carotid dissection in approximately two-thirds of patients is ipsilateral head, face, or neck pain,^2,6 typically described as sharp, constant, and nonthrobbing. Patients report a subjective bruit in 21% to 39% of cases.⁷ An acute partial painful Horner syndrome is strongly associated with ICAD, but is present in fewer than half of such patients.⁶ It is characterized by miosis and ptosis and is the result of compression of the ascending sympathetic fibers that travel alongside the ICA within the carotid sheath. Anhidrosis is not present because the fibers for sweat function in the face travel along the external carotid artery.²

Differential Diagnosis

While there is overlap between strokes caused by ICAD versus plaque, some features can help guide the clinician. Symptomatic carotid disease will frequently present with a history of one or more transient ischemic attacks characterized by focal neurological dysfunction or transient monocular blindness—typically within the previous 6 months.⁸ This history is not usually present in patients with ICAD. Secondly, pain is a much more prominent symptom in ICAD compared to patients with severe carotid atherosclerosis. The history of trauma, even minor, should make dissection higher on the differential diagnosis. Fortunately, the imaging studies to evaluate for these two diseases are the same.

Assessing Pupillary Asymmetry and Ptosis

Careful attention must be paid to assessing a patient for pupillary asymmetry. In a patient with anisocoria, determining the abnormal pupil may require examination of the patient in both bright and dark lighting conditions. The first step is to examine the patient’s pupils under normal lighting conditions. The next step is to assess each pupil’s response to shining a bright light in each eye. The abnormal pupil is the pupil that does not respond well or at all to bright light shone directly in the eye. If the anisocoria is greatest in bright light, the larger pupil is the abnormal pupil. When the anisocoria is greater in dark conditions, the smaller pupil is the abnormal pupil. In this case, the patient’s abnormal pupil was incorrectly diagnosed as the contralateral larger pupil (ie, left)—highlighting the importance of performing a complete pupillary examination in all patients presenting with neurological symptoms.⁹

Furthermore, as demonstrated in this case, ptosis in a patient with Horner syndrome caused by an ICAD can be subtle. The ptosis is the result of paralysis of Müeller’s muscle, which is innervated by the sympathetic pathway. The levator palpebrae superioris, which causes the more profound ptosis seen in third nerve palsies, is unaffected.¹⁰

Imaging Studies

Once the diagnosis of ICAD is suspected, appropriate vascular imaging must be obtained. Digital subtraction angiography has historically been the gold standard for vascular imaging of the neck vessels, but it has largely been replaced by less invasive and more readily available imaging modalities such as CTA and MRI/MRA.¹¹

Computed Tomography Angiography. This is a widely available, rapid imaging choice and has a sensitivity of 80% to 95% in the detection of ICAD.⁷ It has a greater ability than MRI to identify dissection features such as intimal flaps, pseudoaneurysms, and high-grade stenosis versus occlusion. One of its disadvantages is the need for iodinated contrast, which can limit the ability to obtain the test in those with renal disease or patients with true allergies to IV contrast material. In addition, a mural hematoma can be mistaken for a noncalcified atherosclerotic plaque in the vessel lumen.⁶

Magnetic Resonance Imaging and Magnetic Resonance Angiography. Both MRI and MRA are also frequently used to diagnose ICAD. The intramural hematoma displays a hyperdense signal on T1-weighted images and has a characteristic crescent shape adjacent to the lumen.¹¹ Magnetic resonance imaging studies are also sensitive in detecting cerebral ischemia resulting from the dissection. However, the sensitivity of MRI/MRA is highest 2 days after the dissection has occurred.²

Doppler Ultrasound. This is another imaging modality used to detect ICAD—one that is noninvasive, less expensive, requires no contrast material, and is widely available. Limitations of Doppler ultrasound include the inability to scan the distal ICA and a lower sensitivity in detecting dissections that cause low-grade stenosis.² It is more commonly used for follow-up monitoring of dissections.

Management

There are several options for managing ICAD. In patients with unstable lesions, progressing neurological deficit, or further strokes, endovascular stenting has been shown to have a technical success rate of 99% and a procedural complication rate of 1.3%.¹² Similarly, if the patient exhibits symptoms of cerebral ischemia, severe narrowing of the arterial lumen, or an unstable plaque, IV heparin is frequently used, followed by warfarin.¹³ However, since the majority of carotid and vertebral artery dissections heal spontaneously,¹⁴ antithrombotic therapies, including aspirin, clopidogrel or warfarin, are often prescribed to prevent thromboembolic complications.

Conclusion

Diagnosing ICAD requires knowledge of the typical history and presenting features of the disease. Careful attention to the ocular examination must be undertaken in any patient presenting with headache or face or neck pain, because the findings can be subtle. In a patient in whom ICAD is suspected, imaging with CTA or MRI/MRA should be performed. Early consultation with vascular surgery services  can help determine the most appropriate treatment strategy.

Internal carotid artery dissection (ICAD) is an uncommon cause of stroke that typically occurs in the setting of (often minor) trauma but can also occur spontaneously. Patients with ICAD typically present with ipsilateral head, face, or neck pain. In approximately half of ICAD cases, an acute partial, painful Horner syndrome is present on examination. Although computed tomography angiography (CTA) is currently the imaging study of choice, magnetic resonance imaging/magnetic resonance angiography (MRI/MRA) and Doppler ultrasound can also be used. Management options include thrombolysis, antiplatelet or anticoagulation therapy, and endovascular or surgical intervention.

Case

A 56-year-old man with a history of migraines presented to the ED with a chief complaint of a 4-day history of right-sided headache. He stated that the pain felt different from his usual migraines and was located behind his right eye. Prior to presentation at the ED, the patient had initially visited an urgent care facility for evaluation. The physician who evaluated the patient at the urgent care facility noted the patient’s left eye appeared dilated and referred him to the ED for evaluation.

The patient further stated that the day prior to presentation, one of his friends had also remarked that the patient’s left eye appeared to be enlarged. The patient denied any visual disturbances, focal weakness, nausea, vomiting, neck pain, or stiffness. His medical history was significant for paroxysmal atrial flutter and hypertension. Regarding medications, the patient was taking dronedarone, clonazepam, omeprazole, and metoprolol.

On physical examination, the patient’s vital signs were: blood pressure, 162/109 mm Hg; heart rate, 85 beats/minute and regular; respiratory rate, 18 breaths/minute; and temperature, 98.6°F. Oxygen saturation was 98% on room air. The patient appeared to be in no acute distress. Ocular examination revealed a dilated left pupil of approximately 5 to 6 mm, and a right pupil measuring approximately 3 mm. Both pupils reacted to light, and the extraocular muscles were intact. The patient’s face appeared symmetrical and had intact sensation. He had normal speech, midline tongue, and good bilateral shoulder shrug. The neck examination revealed normal range of motion with full flexion, without jugular vein distention, lymphadenopathy, or palpable thyroid. The cardiovascular, lung, and abdominal examinations were all normal. The neurological examination showed the patient to be awake, alert, and oriented to person, place, and time. He exhibited 5/5 motor strength in all four extremities, normal gait, and normal finger-to-nose performance; his reflexes were 2+ and symmetrical.

The emergency physician (EP) ordered a stat noncontrast CT scan of the head, complete blood count (CBC), and basic metabolic panel (BMP). The CT scan of the head was interpreted by the radiologist as “no acute intracranial abnormality,” and the CBC and the BMP were normal. Since the EP was concerned about a carotid artery aneurysm or dissection, he ordered a CTA of the head and neck (Figures 1 and 2). The CTA was read as:

Long segment dissection of postbulbar cervical segment of right internal carotid artery, very likely extending into the intracranial segment with critical stenosis at the junction of the high cervical segment and proximal petrous segment. Preserved runoff circulation to the anterior and middle cerebral arteries with robust capacity for collateral support in the context of patent anterior and posterior communicating arteries.

Based on the radiology report, the EP consulted with vascular surgery services, and ordered a Doppler study of the ICAs. The Doppler study demonstrated “arterial thrombus in the right distal extracranial internal carotid artery with hemodynamics suggestive of a distal occlusion/significant obstruction.” The patient was started on an intravenous (IV) heparin drip and admitted to the hospital. Three days later he experienced sudden onset of left arm weakness. An emergent CTA of the head and neck revealed an embolic occlusion of mid-to-distal M1 segment of the right middle cerebral artery. The patient was immediately evaluated by interventional radiology for possible clot removal; however, based on his rapid neurological improvement, he was instead treated medically with aspirin and clopidogrel and continued to show significant neurological improvement. He was discharged home on hospital day 8 on both antiplatelet agents with minimal neurological deficit.

Discussion

Even though ICAD accounts for only 1% to 2% of all strokes, it is responsible for 10% to 25% of strokes in young and middle-aged adults.^1-3 The peak incidence for ICAD is in the fifth decade, and it affects men and women equally.⁴ The extracranial portion of the ICA is the most commonly affected vessel (>90%); dissections of the intracranial portion are associated with greater neurological deficits and have a poorer prognosis.^2,5 Cerebral ischemia resulting from a dissection of the extracranial ICA may occur days to weeks after the onset of local symptoms such as head or neck pain, Horner syndrome, or tinnitus.⁵

In ICAD, a tear in the artery wall causes blood to enter the tunica media of the vessel, forming an intramural hematoma.^2,6 This may result in either stenosis of the lumen of the vessel from the enlarging hematoma or an outward aneurysmal dilatation of the vessel that compresses surrounding structures.^2,6 Subsequent cerebral ischemia is the result of either arterial embolism or hemodynamic compromise from vessel stenosis.^2,3

Causes

Dissections often occur secondary to trauma, though the severity of the trauma may be quite minor.^2,6 Seemingly trivial mechanisms that have been associated with dissections include nose blowing, coughing, sudden neck turning, and prolonged telephone conversations. Other known causes are motor vehicle accidents and chiropractic maneuvers. Inherited connective tissue disorders, including Ehlers-Danlos syndrome, Marfan syndrome, fibromuscular dysplasia, and osteogenesis imperfecta, are associated with spontaneous ICAD.^2,6

Symptoms

The most common presenting symptom of carotid dissection in approximately two-thirds of patients is ipsilateral head, face, or neck pain,^2,6 typically described as sharp, constant, and nonthrobbing. Patients report a subjective bruit in 21% to 39% of cases.⁷ An acute partial painful Horner syndrome is strongly associated with ICAD, but is present in fewer than half of such patients.⁶ It is characterized by miosis and ptosis and is the result of compression of the ascending sympathetic fibers that travel alongside the ICA within the carotid sheath. Anhidrosis is not present because the fibers for sweat function in the face travel along the external carotid artery.²

Differential Diagnosis

While there is overlap between strokes caused by ICAD versus plaque, some features can help guide the clinician. Symptomatic carotid disease will frequently present with a history of one or more transient ischemic attacks characterized by focal neurological dysfunction or transient monocular blindness—typically within the previous 6 months.⁸ This history is not usually present in patients with ICAD. Secondly, pain is a much more prominent symptom in ICAD compared to patients with severe carotid atherosclerosis. The history of trauma, even minor, should make dissection higher on the differential diagnosis. Fortunately, the imaging studies to evaluate for these two diseases are the same.

Assessing Pupillary Asymmetry and Ptosis

Careful attention must be paid to assessing a patient for pupillary asymmetry. In a patient with anisocoria, determining the abnormal pupil may require examination of the patient in both bright and dark lighting conditions. The first step is to examine the patient’s pupils under normal lighting conditions. The next step is to assess each pupil’s response to shining a bright light in each eye. The abnormal pupil is the pupil that does not respond well or at all to bright light shone directly in the eye. If the anisocoria is greatest in bright light, the larger pupil is the abnormal pupil. When the anisocoria is greater in dark conditions, the smaller pupil is the abnormal pupil. In this case, the patient’s abnormal pupil was incorrectly diagnosed as the contralateral larger pupil (ie, left)—highlighting the importance of performing a complete pupillary examination in all patients presenting with neurological symptoms.⁹

Furthermore, as demonstrated in this case, ptosis in a patient with Horner syndrome caused by an ICAD can be subtle. The ptosis is the result of paralysis of Müeller’s muscle, which is innervated by the sympathetic pathway. The levator palpebrae superioris, which causes the more profound ptosis seen in third nerve palsies, is unaffected.¹⁰

Imaging Studies

Once the diagnosis of ICAD is suspected, appropriate vascular imaging must be obtained. Digital subtraction angiography has historically been the gold standard for vascular imaging of the neck vessels, but it has largely been replaced by less invasive and more readily available imaging modalities such as CTA and MRI/MRA.¹¹

Computed Tomography Angiography. This is a widely available, rapid imaging choice and has a sensitivity of 80% to 95% in the detection of ICAD.⁷ It has a greater ability than MRI to identify dissection features such as intimal flaps, pseudoaneurysms, and high-grade stenosis versus occlusion. One of its disadvantages is the need for iodinated contrast, which can limit the ability to obtain the test in those with renal disease or patients with true allergies to IV contrast material. In addition, a mural hematoma can be mistaken for a noncalcified atherosclerotic plaque in the vessel lumen.⁶

Magnetic Resonance Imaging and Magnetic Resonance Angiography. Both MRI and MRA are also frequently used to diagnose ICAD. The intramural hematoma displays a hyperdense signal on T1-weighted images and has a characteristic crescent shape adjacent to the lumen.¹¹ Magnetic resonance imaging studies are also sensitive in detecting cerebral ischemia resulting from the dissection. However, the sensitivity of MRI/MRA is highest 2 days after the dissection has occurred.²

Doppler Ultrasound. This is another imaging modality used to detect ICAD—one that is noninvasive, less expensive, requires no contrast material, and is widely available. Limitations of Doppler ultrasound include the inability to scan the distal ICA and a lower sensitivity in detecting dissections that cause low-grade stenosis.² It is more commonly used for follow-up monitoring of dissections.

Management

There are several options for managing ICAD. In patients with unstable lesions, progressing neurological deficit, or further strokes, endovascular stenting has been shown to have a technical success rate of 99% and a procedural complication rate of 1.3%.¹² Similarly, if the patient exhibits symptoms of cerebral ischemia, severe narrowing of the arterial lumen, or an unstable plaque, IV heparin is frequently used, followed by warfarin.¹³ However, since the majority of carotid and vertebral artery dissections heal spontaneously,¹⁴ antithrombotic therapies, including aspirin, clopidogrel or warfarin, are often prescribed to prevent thromboembolic complications.

Conclusion

Diagnosing ICAD requires knowledge of the typical history and presenting features of the disease. Careful attention to the ocular examination must be undertaken in any patient presenting with headache or face or neck pain, because the findings can be subtle. In a patient in whom ICAD is suspected, imaging with CTA or MRI/MRA should be performed. Early consultation with vascular surgery services  can help determine the most appropriate treatment strategy.

In The Case Report Issue, we feature four separate case reports presenting different conditions, much like patients may present in succession to a busy ED. Though considered of lesser importance than other types of peer-reviewed literature in this era of evidence-based medicine, case reports nevertheless fulfill an important role in clinical practice, medical education, and even medical research by identifying and tracking an important cause of a developing disease--especially one with a toxicologic or infectious etiology. In some instances, case reports also identify effective or ineffective treatments (though the latter is more rarely reported) and adverse effects of approved treatments, especially those of a newly introduced “Phase IV” medication.

Often, the ED is the initial setting for many reportable occurrences, and in recent years, patients first presenting to EDs have alerted the entire medical community to serious emerging illnesses such as Legionnaires’ disease, HIV and AIDS, anthrax, and Ebola. Most recently, firsthand reports by a pair of mother/daughter physicians in Brazil linked an alarming appearance of several new cases of microcephaly to a rash that followed a mosquito bite during pregnancy, and ultimately to identification of the mosquito-borne Zika virus.

Similarly, toxicologists at urban poison centers have been able to rapidly link cases of new and puzzling adverse effects and deaths reported by area emergency physicians to a dangerous new street drug or combination of drugs in that area, such as synthetic cannabinoid agonists, or heroin mixed with scopolamine, and then immediately alert other physicians and the public to these dangers.

As recently described by Florek and Dellavalle in Journal of Medical Case Reports (http://bit.ly/28PLi7w), case reports make meaningful contributions to the knowledge and education of medical students, residents, fellows, and (we would add) attendings. Written with the goal of sharing information for medical or scientific purposes, they often serve as a young physician’s first experience with medical writing and provide a solid foundation for manuscript preparation and publication.

Finally, a good ED case report that includes accurate descriptions of all relevant features along with any unique departures from classical presentations, followed by an up-to-date review of current treatments, presents most of us with a vivid means of identifying and remembering the salient features of a clinical problem or disease.

In The Case Report Issue, we feature four separate case reports presenting different conditions, much like patients may present in succession to a busy ED. Though considered of lesser importance than other types of peer-reviewed literature in this era of evidence-based medicine, case reports nevertheless fulfill an important role in clinical practice, medical education, and even medical research by identifying and tracking an important cause of a developing disease--especially one with a toxicologic or infectious etiology. In some instances, case reports also identify effective or ineffective treatments (though the latter is more rarely reported) and adverse effects of approved treatments, especially those of a newly introduced “Phase IV” medication.

Often, the ED is the initial setting for many reportable occurrences, and in recent years, patients first presenting to EDs have alerted the entire medical community to serious emerging illnesses such as Legionnaires’ disease, HIV and AIDS, anthrax, and Ebola. Most recently, firsthand reports by a pair of mother/daughter physicians in Brazil linked an alarming appearance of several new cases of microcephaly to a rash that followed a mosquito bite during pregnancy, and ultimately to identification of the mosquito-borne Zika virus.

Similarly, toxicologists at urban poison centers have been able to rapidly link cases of new and puzzling adverse effects and deaths reported by area emergency physicians to a dangerous new street drug or combination of drugs in that area, such as synthetic cannabinoid agonists, or heroin mixed with scopolamine, and then immediately alert other physicians and the public to these dangers.

As recently described by Florek and Dellavalle in Journal of Medical Case Reports (http://bit.ly/28PLi7w), case reports make meaningful contributions to the knowledge and education of medical students, residents, fellows, and (we would add) attendings. Written with the goal of sharing information for medical or scientific purposes, they often serve as a young physician’s first experience with medical writing and provide a solid foundation for manuscript preparation and publication.

Finally, a good ED case report that includes accurate descriptions of all relevant features along with any unique departures from classical presentations, followed by an up-to-date review of current treatments, presents most of us with a vivid means of identifying and remembering the salient features of a clinical problem or disease.

In The Case Report Issue, we feature four separate case reports presenting different conditions, much like patients may present in succession to a busy ED. Though considered of lesser importance than other types of peer-reviewed literature in this era of evidence-based medicine, case reports nevertheless fulfill an important role in clinical practice, medical education, and even medical research by identifying and tracking an important cause of a developing disease--especially one with a toxicologic or infectious etiology. In some instances, case reports also identify effective or ineffective treatments (though the latter is more rarely reported) and adverse effects of approved treatments, especially those of a newly introduced “Phase IV” medication.

Often, the ED is the initial setting for many reportable occurrences, and in recent years, patients first presenting to EDs have alerted the entire medical community to serious emerging illnesses such as Legionnaires’ disease, HIV and AIDS, anthrax, and Ebola. Most recently, firsthand reports by a pair of mother/daughter physicians in Brazil linked an alarming appearance of several new cases of microcephaly to a rash that followed a mosquito bite during pregnancy, and ultimately to identification of the mosquito-borne Zika virus.

Similarly, toxicologists at urban poison centers have been able to rapidly link cases of new and puzzling adverse effects and deaths reported by area emergency physicians to a dangerous new street drug or combination of drugs in that area, such as synthetic cannabinoid agonists, or heroin mixed with scopolamine, and then immediately alert other physicians and the public to these dangers.

As recently described by Florek and Dellavalle in Journal of Medical Case Reports (http://bit.ly/28PLi7w), case reports make meaningful contributions to the knowledge and education of medical students, residents, fellows, and (we would add) attendings. Written with the goal of sharing information for medical or scientific purposes, they often serve as a young physician’s first experience with medical writing and provide a solid foundation for manuscript preparation and publication.

Finally, a good ED case report that includes accurate descriptions of all relevant features along with any unique departures from classical presentations, followed by an up-to-date review of current treatments, presents most of us with a vivid means of identifying and remembering the salient features of a clinical problem or disease.

CDC Issues Advisory About First Mcr-1 Gene in E Coli Found in a Human in the United States

BY JEFF BAUER

The Centers for Disease Control and Prevention (CDC) issued a health advisory to emphasize the importance of taking measures to prevent the transmission of antibiotic-resistant bacteria after a Pennsylvania woman with no recent travel outside of the United States was found to have Escherichia coli (E coli) bacteria carrying the mcr-1 gene. The mcr-1 gene makes bacteria resistant to colistin, which is used as a last-resort antibiotic to treat patients who have multidrug-resistant infections, including carbapenem-resistant Enterobacteriaceae (CRE).  The mcr-1 gene exists on a small piece of DNA that is capable of moving from one bacterium to another, which would allow it to spread antibiotic resistance among species.  The CDC has been on alert for this gene in the United States ever since its emergence in China in 2015. 

The patient in Pennsylvania, who was being treated for a urinary tract infection (UTI), is believed to be the first human case of mcr-1 E coli in the United States. Although the E coli isolate from the patient was also resistant to antibiotics in five additional antibiotic classes (cephalosporins, fluoroquinolones, sulfonamides, aminoglycosides, and tetracyclines), the woman did not have CRE and the bacteria identified were not resistant to all antibiotics. However, the presence of the mcr-1 gene and its ability to share its colistin resistance with other bacteria increases the risk that pan-resistant bacteria could develop. The CDC’s laboratories have developed protocols for testing microorganisms for the mcr-1 gene and the CDC was performing screening tests to see if people in contact with the patient with mcr-1 might be colonized with this organism.

The CDC recommends that clinicians follow Standard and Contact Precautions for any patients colonized or infected with antibiotic-resistant bacteria, including patients found to have mcr-1-mediated resistant organisms. If a patient is found to have Enterobacteriaceae with mcr-1, healthcare facilities and laboratories should immediately notify local or state public health authorities, and inform all clinicians who are caring for the patient. Any room in which a patient with an antibiotic-resistant infection has been placed should receive thorough daily and terminal cleaning.

1.    Centers for Disease Control and Prevention. Alert to U.S. healthcare facilities: first mcr-1 gene in E. coli bacteria found in a human in the United States. https://emergency.cdc.gov/han/han00390.asp. Accessed June 23, 2016.

Emergency Medicine Associate Editor Named as Chair of EM at Rutgers

Lewis S. Nelson, MD, has been appointed as the Chair of the Department of Emergency Medicine at Rutgers New Jersey Medical School and Chief of Service of the Emergency Department at University Hospital in Newark. For many years, Dr Nelson has been serving as associate editor, toxicology, for Emergency Medicine, overseeing the journal’s Case Studies in Toxicology department. 

HIV Rapid Tests Miss 1 in 7 Infections

BY RICHARD PIZZI

FROM AIDS

apid human immunodeficiency virus (HIV) tests in high-income countries miss about one in seven infections and should be used in combination with fourth-generation enzyme immunoassays (EIA) or nucleic acid amplification tests (NAAT) in clinical settings whenever possible, according to a study in the journal AIDS.

“These infections are likely to be particularly transmissible due to the high HIV viral load in early infection...in high-income countries, rapid tests should be used in combination with fourth-generation EIA or NAAT, except in special circumstances,” the Australian researchers said.

Researchers performed a systematic review and meta-analysis of 18 studies involving 110,122 HIV rapid test results. The primary outcome was the test’s sensitivity for detecting acute or established HIV infections. Sensitivity was calculated by dividing the number of confirmed positive rapid tests by the number of confirmed positive comparator tests. Specificity was calculated by dividing the number of confirmed negative rapid tests by the number of negative comparator tests.

Compared with EIA, the estimated sensitivity of rapid tests was 94.5% (95% confidence interval [CI], 87.4-97.7). Compared with NAAT, the sensitivity of rapid tests was 93.7% (95% CI, 88.7-96.5). The sensitivity of rapid tests in high-income countries was 85.7% (95% CI, 81.9-88.9), and in low-income countries it was 97.7% (95% CI, 95.2-98.9), compared with either EIA or NAAT (P < .01 for difference between settings). Proportions of antibody-negative acute infections were 13.6% (95% CI, 10.1-18.0) and 4.7% (95% CI, 2.8-7.7) in studies from high- and low-income countries, respectively (P < .01).

Rapid tests were less sensitive when used in clinical settings in high-income countries, regardless of whether they were compared with a NAAT or fourth-generation EIA. However, the researchers noted that the discrepancy between high- and low-income countries could be attributed to the higher proportion of acute HIV infections (antibody-negative NAAT positive) in populations tested in high-income countries, which might reflect higher background testing rates or a higher incidence of HIV in men who have sex with men.

1.    Tan WS, Chow EP, Fairley CK, Chen MY, Bradshaw CS, Read TR. Sensitivity of HIV rapid tests compared to fourth generation enzyme immunoassays or HIV RNA tests - a systematic review and meta-analysis. AIDS. 2016 Apr 27. [Epub ahead of print]

Two-Step ED Urinary Tract Infection Screening Cuts Catheterization Rate in Half

BY TARA HAELLE

FROM PEDIATRICS

fter implementation of a quality improvement initiative to more effectively screen febrile children for UTIs in the ED, catheterization rates dropped from 63% to 30% over a 6-month period, a study found.

The sustained drop prevented more than 350 young children from catheterization without increasing revisit rates or missing UTIs in the 39% of children who were followed in the care network. This was in a study that compared catheterization rates in 1,520 children aged 6 to 24 months in the year before the intervention and 828 children in the 6 months during the intervention.

“Although urine catheterization remains the gold standard in diagnosing UTIs, it is an invasive procedure that may be avoided in most patients who are being screened,” wrote Dr Jane M. Lavelle of Children’s Hospital of Philadelphia (CHOP) and her associates. Screening for UTIs by this method can be “painful, time consuming, and costly,” they added.

An alternative method to automatic catheterization is a two-step process already included as an option in the American Academy of Pediatrics guidelines: instead of collecting urine through catheterization just once for screening and culture, an ED first noninvasively collects urine with a urine bag for screening in those indicated with evidence-based risk factors, and then catheterizes only those who screen positive.

“Due to the predictive models’ higher sensitivity than specificity for screening, most urine samples will have a negative screen for pyuria or bacteriuria by urine dipstick or microscopy,” the authors wrote.

At baseline, CHOP’s ED was screening 63% of febrile children under age 24 months using catheterization, but screens were most commonly negative and only 4.3% had positive cultures. The authors therefore initiated a switch to the two-step method as a pilot run in one ED area before educating all ED personnel and expanding to the full department in the second month.

Children aged 6 to 24 months comprised approximately 20% of the ED’s more than 90,000 annual patients, and about 22% of these children presented with fever as the primary concern. Children with a history of genitourinary problems or immune deficiency were excluded.

The pilot ran in an “urgent care section of ED where there are typically more children with less complex medical histories and where ‘fever’ is a common complaint,” the investigators said. The staff completed a learning module with assessment and then received in-person and visual reminders of the procedure.

While 69% of 828 febrile young children still underwent screening during the 6-month intervention period, only 16% still underwent urethral catheterization as the initial screening step, typically because of strong clinical indications for a UTI. Another 14% underwent catheterization only after a positive urine screen from an initial noninvasive urine collection or because of an inability to get an adequate urine specimen with the bag. The reduction in catheterization dropped to 55% within 2 weeks of the intervention’s start and spread to other hospital departments. The drop to a 30% catheterization rate remained throughout 18 additional months of monitoring.

The research did not use external funding, and the researchers reported they had no financial disclosures.

1.    Lavelle JM, Blackstone MM, Funari MK, et al. Two-step process for ED UTI screening in febrile young children: reducing catheterization rates. Pediatrics. 2016 Jun 2. pii: e20153023. [Epub ahead of print].

CDC Issues Advisory About First Mcr-1 Gene in E Coli Found in a Human in the United States

BY JEFF BAUER

The Centers for Disease Control and Prevention (CDC) issued a health advisory to emphasize the importance of taking measures to prevent the transmission of antibiotic-resistant bacteria after a Pennsylvania woman with no recent travel outside of the United States was found to have Escherichia coli (E coli) bacteria carrying the mcr-1 gene. The mcr-1 gene makes bacteria resistant to colistin, which is used as a last-resort antibiotic to treat patients who have multidrug-resistant infections, including carbapenem-resistant Enterobacteriaceae (CRE).  The mcr-1 gene exists on a small piece of DNA that is capable of moving from one bacterium to another, which would allow it to spread antibiotic resistance among species.  The CDC has been on alert for this gene in the United States ever since its emergence in China in 2015. 

The patient in Pennsylvania, who was being treated for a urinary tract infection (UTI), is believed to be the first human case of mcr-1 E coli in the United States. Although the E coli isolate from the patient was also resistant to antibiotics in five additional antibiotic classes (cephalosporins, fluoroquinolones, sulfonamides, aminoglycosides, and tetracyclines), the woman did not have CRE and the bacteria identified were not resistant to all antibiotics. However, the presence of the mcr-1 gene and its ability to share its colistin resistance with other bacteria increases the risk that pan-resistant bacteria could develop. The CDC’s laboratories have developed protocols for testing microorganisms for the mcr-1 gene and the CDC was performing screening tests to see if people in contact with the patient with mcr-1 might be colonized with this organism.

The CDC recommends that clinicians follow Standard and Contact Precautions for any patients colonized or infected with antibiotic-resistant bacteria, including patients found to have mcr-1-mediated resistant organisms. If a patient is found to have Enterobacteriaceae with mcr-1, healthcare facilities and laboratories should immediately notify local or state public health authorities, and inform all clinicians who are caring for the patient. Any room in which a patient with an antibiotic-resistant infection has been placed should receive thorough daily and terminal cleaning.

1.    Centers for Disease Control and Prevention. Alert to U.S. healthcare facilities: first mcr-1 gene in E. coli bacteria found in a human in the United States. https://emergency.cdc.gov/han/han00390.asp. Accessed June 23, 2016.

Emergency Medicine Associate Editor Named as Chair of EM at Rutgers

Lewis S. Nelson, MD, has been appointed as the Chair of the Department of Emergency Medicine at Rutgers New Jersey Medical School and Chief of Service of the Emergency Department at University Hospital in Newark. For many years, Dr Nelson has been serving as associate editor, toxicology, for Emergency Medicine, overseeing the journal’s Case Studies in Toxicology department. 

HIV Rapid Tests Miss 1 in 7 Infections

BY RICHARD PIZZI

FROM AIDS

apid human immunodeficiency virus (HIV) tests in high-income countries miss about one in seven infections and should be used in combination with fourth-generation enzyme immunoassays (EIA) or nucleic acid amplification tests (NAAT) in clinical settings whenever possible, according to a study in the journal AIDS.

“These infections are likely to be particularly transmissible due to the high HIV viral load in early infection...in high-income countries, rapid tests should be used in combination with fourth-generation EIA or NAAT, except in special circumstances,” the Australian researchers said.

Researchers performed a systematic review and meta-analysis of 18 studies involving 110,122 HIV rapid test results. The primary outcome was the test’s sensitivity for detecting acute or established HIV infections. Sensitivity was calculated by dividing the number of confirmed positive rapid tests by the number of confirmed positive comparator tests. Specificity was calculated by dividing the number of confirmed negative rapid tests by the number of negative comparator tests.

Compared with EIA, the estimated sensitivity of rapid tests was 94.5% (95% confidence interval [CI], 87.4-97.7). Compared with NAAT, the sensitivity of rapid tests was 93.7% (95% CI, 88.7-96.5). The sensitivity of rapid tests in high-income countries was 85.7% (95% CI, 81.9-88.9), and in low-income countries it was 97.7% (95% CI, 95.2-98.9), compared with either EIA or NAAT (P < .01 for difference between settings). Proportions of antibody-negative acute infections were 13.6% (95% CI, 10.1-18.0) and 4.7% (95% CI, 2.8-7.7) in studies from high- and low-income countries, respectively (P < .01).

Rapid tests were less sensitive when used in clinical settings in high-income countries, regardless of whether they were compared with a NAAT or fourth-generation EIA. However, the researchers noted that the discrepancy between high- and low-income countries could be attributed to the higher proportion of acute HIV infections (antibody-negative NAAT positive) in populations tested in high-income countries, which might reflect higher background testing rates or a higher incidence of HIV in men who have sex with men.

1.    Tan WS, Chow EP, Fairley CK, Chen MY, Bradshaw CS, Read TR. Sensitivity of HIV rapid tests compared to fourth generation enzyme immunoassays or HIV RNA tests - a systematic review and meta-analysis. AIDS. 2016 Apr 27. [Epub ahead of print]

Two-Step ED Urinary Tract Infection Screening Cuts Catheterization Rate in Half

BY TARA HAELLE

FROM PEDIATRICS

fter implementation of a quality improvement initiative to more effectively screen febrile children for UTIs in the ED, catheterization rates dropped from 63% to 30% over a 6-month period, a study found.

The sustained drop prevented more than 350 young children from catheterization without increasing revisit rates or missing UTIs in the 39% of children who were followed in the care network. This was in a study that compared catheterization rates in 1,520 children aged 6 to 24 months in the year before the intervention and 828 children in the 6 months during the intervention.

“Although urine catheterization remains the gold standard in diagnosing UTIs, it is an invasive procedure that may be avoided in most patients who are being screened,” wrote Dr Jane M. Lavelle of Children’s Hospital of Philadelphia (CHOP) and her associates. Screening for UTIs by this method can be “painful, time consuming, and costly,” they added.

An alternative method to automatic catheterization is a two-step process already included as an option in the American Academy of Pediatrics guidelines: instead of collecting urine through catheterization just once for screening and culture, an ED first noninvasively collects urine with a urine bag for screening in those indicated with evidence-based risk factors, and then catheterizes only those who screen positive.

“Due to the predictive models’ higher sensitivity than specificity for screening, most urine samples will have a negative screen for pyuria or bacteriuria by urine dipstick or microscopy,” the authors wrote.

At baseline, CHOP’s ED was screening 63% of febrile children under age 24 months using catheterization, but screens were most commonly negative and only 4.3% had positive cultures. The authors therefore initiated a switch to the two-step method as a pilot run in one ED area before educating all ED personnel and expanding to the full department in the second month.

Children aged 6 to 24 months comprised approximately 20% of the ED’s more than 90,000 annual patients, and about 22% of these children presented with fever as the primary concern. Children with a history of genitourinary problems or immune deficiency were excluded.

The pilot ran in an “urgent care section of ED where there are typically more children with less complex medical histories and where ‘fever’ is a common complaint,” the investigators said. The staff completed a learning module with assessment and then received in-person and visual reminders of the procedure.

While 69% of 828 febrile young children still underwent screening during the 6-month intervention period, only 16% still underwent urethral catheterization as the initial screening step, typically because of strong clinical indications for a UTI. Another 14% underwent catheterization only after a positive urine screen from an initial noninvasive urine collection or because of an inability to get an adequate urine specimen with the bag. The reduction in catheterization dropped to 55% within 2 weeks of the intervention’s start and spread to other hospital departments. The drop to a 30% catheterization rate remained throughout 18 additional months of monitoring.

The research did not use external funding, and the researchers reported they had no financial disclosures.

1.    Lavelle JM, Blackstone MM, Funari MK, et al. Two-step process for ED UTI screening in febrile young children: reducing catheterization rates. Pediatrics. 2016 Jun 2. pii: e20153023. [Epub ahead of print].

CDC Issues Advisory About First Mcr-1 Gene in E Coli Found in a Human in the United States

BY JEFF BAUER

The Centers for Disease Control and Prevention (CDC) issued a health advisory to emphasize the importance of taking measures to prevent the transmission of antibiotic-resistant bacteria after a Pennsylvania woman with no recent travel outside of the United States was found to have Escherichia coli (E coli) bacteria carrying the mcr-1 gene. The mcr-1 gene makes bacteria resistant to colistin, which is used as a last-resort antibiotic to treat patients who have multidrug-resistant infections, including carbapenem-resistant Enterobacteriaceae (CRE).  The mcr-1 gene exists on a small piece of DNA that is capable of moving from one bacterium to another, which would allow it to spread antibiotic resistance among species.  The CDC has been on alert for this gene in the United States ever since its emergence in China in 2015. 

The patient in Pennsylvania, who was being treated for a urinary tract infection (UTI), is believed to be the first human case of mcr-1 E coli in the United States. Although the E coli isolate from the patient was also resistant to antibiotics in five additional antibiotic classes (cephalosporins, fluoroquinolones, sulfonamides, aminoglycosides, and tetracyclines), the woman did not have CRE and the bacteria identified were not resistant to all antibiotics. However, the presence of the mcr-1 gene and its ability to share its colistin resistance with other bacteria increases the risk that pan-resistant bacteria could develop. The CDC’s laboratories have developed protocols for testing microorganisms for the mcr-1 gene and the CDC was performing screening tests to see if people in contact with the patient with mcr-1 might be colonized with this organism.

The CDC recommends that clinicians follow Standard and Contact Precautions for any patients colonized or infected with antibiotic-resistant bacteria, including patients found to have mcr-1-mediated resistant organisms. If a patient is found to have Enterobacteriaceae with mcr-1, healthcare facilities and laboratories should immediately notify local or state public health authorities, and inform all clinicians who are caring for the patient. Any room in which a patient with an antibiotic-resistant infection has been placed should receive thorough daily and terminal cleaning.

1.    Centers for Disease Control and Prevention. Alert to U.S. healthcare facilities: first mcr-1 gene in E. coli bacteria found in a human in the United States. https://emergency.cdc.gov/han/han00390.asp. Accessed June 23, 2016.

Emergency Medicine Associate Editor Named as Chair of EM at Rutgers

Lewis S. Nelson, MD, has been appointed as the Chair of the Department of Emergency Medicine at Rutgers New Jersey Medical School and Chief of Service of the Emergency Department at University Hospital in Newark. For many years, Dr Nelson has been serving as associate editor, toxicology, for Emergency Medicine, overseeing the journal’s Case Studies in Toxicology department. 

HIV Rapid Tests Miss 1 in 7 Infections

BY RICHARD PIZZI

FROM AIDS

apid human immunodeficiency virus (HIV) tests in high-income countries miss about one in seven infections and should be used in combination with fourth-generation enzyme immunoassays (EIA) or nucleic acid amplification tests (NAAT) in clinical settings whenever possible, according to a study in the journal AIDS.

“These infections are likely to be particularly transmissible due to the high HIV viral load in early infection...in high-income countries, rapid tests should be used in combination with fourth-generation EIA or NAAT, except in special circumstances,” the Australian researchers said.

Researchers performed a systematic review and meta-analysis of 18 studies involving 110,122 HIV rapid test results. The primary outcome was the test’s sensitivity for detecting acute or established HIV infections. Sensitivity was calculated by dividing the number of confirmed positive rapid tests by the number of confirmed positive comparator tests. Specificity was calculated by dividing the number of confirmed negative rapid tests by the number of negative comparator tests.

Compared with EIA, the estimated sensitivity of rapid tests was 94.5% (95% confidence interval [CI], 87.4-97.7). Compared with NAAT, the sensitivity of rapid tests was 93.7% (95% CI, 88.7-96.5). The sensitivity of rapid tests in high-income countries was 85.7% (95% CI, 81.9-88.9), and in low-income countries it was 97.7% (95% CI, 95.2-98.9), compared with either EIA or NAAT (P < .01 for difference between settings). Proportions of antibody-negative acute infections were 13.6% (95% CI, 10.1-18.0) and 4.7% (95% CI, 2.8-7.7) in studies from high- and low-income countries, respectively (P < .01).

Rapid tests were less sensitive when used in clinical settings in high-income countries, regardless of whether they were compared with a NAAT or fourth-generation EIA. However, the researchers noted that the discrepancy between high- and low-income countries could be attributed to the higher proportion of acute HIV infections (antibody-negative NAAT positive) in populations tested in high-income countries, which might reflect higher background testing rates or a higher incidence of HIV in men who have sex with men.

1.    Tan WS, Chow EP, Fairley CK, Chen MY, Bradshaw CS, Read TR. Sensitivity of HIV rapid tests compared to fourth generation enzyme immunoassays or HIV RNA tests - a systematic review and meta-analysis. AIDS. 2016 Apr 27. [Epub ahead of print]

Two-Step ED Urinary Tract Infection Screening Cuts Catheterization Rate in Half

BY TARA HAELLE

FROM PEDIATRICS

fter implementation of a quality improvement initiative to more effectively screen febrile children for UTIs in the ED, catheterization rates dropped from 63% to 30% over a 6-month period, a study found.

The sustained drop prevented more than 350 young children from catheterization without increasing revisit rates or missing UTIs in the 39% of children who were followed in the care network. This was in a study that compared catheterization rates in 1,520 children aged 6 to 24 months in the year before the intervention and 828 children in the 6 months during the intervention.

“Although urine catheterization remains the gold standard in diagnosing UTIs, it is an invasive procedure that may be avoided in most patients who are being screened,” wrote Dr Jane M. Lavelle of Children’s Hospital of Philadelphia (CHOP) and her associates. Screening for UTIs by this method can be “painful, time consuming, and costly,” they added.

An alternative method to automatic catheterization is a two-step process already included as an option in the American Academy of Pediatrics guidelines: instead of collecting urine through catheterization just once for screening and culture, an ED first noninvasively collects urine with a urine bag for screening in those indicated with evidence-based risk factors, and then catheterizes only those who screen positive.

“Due to the predictive models’ higher sensitivity than specificity for screening, most urine samples will have a negative screen for pyuria or bacteriuria by urine dipstick or microscopy,” the authors wrote.

At baseline, CHOP’s ED was screening 63% of febrile children under age 24 months using catheterization, but screens were most commonly negative and only 4.3% had positive cultures. The authors therefore initiated a switch to the two-step method as a pilot run in one ED area before educating all ED personnel and expanding to the full department in the second month.

Children aged 6 to 24 months comprised approximately 20% of the ED’s more than 90,000 annual patients, and about 22% of these children presented with fever as the primary concern. Children with a history of genitourinary problems or immune deficiency were excluded.

The pilot ran in an “urgent care section of ED where there are typically more children with less complex medical histories and where ‘fever’ is a common complaint,” the investigators said. The staff completed a learning module with assessment and then received in-person and visual reminders of the procedure.

While 69% of 828 febrile young children still underwent screening during the 6-month intervention period, only 16% still underwent urethral catheterization as the initial screening step, typically because of strong clinical indications for a UTI. Another 14% underwent catheterization only after a positive urine screen from an initial noninvasive urine collection or because of an inability to get an adequate urine specimen with the bag. The reduction in catheterization dropped to 55% within 2 weeks of the intervention’s start and spread to other hospital departments. The drop to a 30% catheterization rate remained throughout 18 additional months of monitoring.

The research did not use external funding, and the researchers reported they had no financial disclosures.

1.    Lavelle JM, Blackstone MM, Funari MK, et al. Two-step process for ED UTI screening in febrile young children: reducing catheterization rates. Pediatrics. 2016 Jun 2. pii: e20153023. [Epub ahead of print].