Pain

The proportion of patients who obtained an opioid prescription for hydrocodone after Mohs micrographic surgery fell by 21.7% between 2011 and 2020, while the use of tramadol increased by 26.3% between 2009 and 2020, according to a cross-sectional analysis of national insurance claims data.

The findings suggest that dermatologic surgeons generally understood opioid prescription risks and public health warnings about the opioid epidemic, corresponding study author Surya A. Veerabagu said in an interview.

“The frequency of opioid prescriptions after Mohs surgery went up a little bit from 2009 to 2011, but then it subsequently decreased,” said Ms. Veerabagu, a 4th-year student at Tulane University, New Orleans. “It very much correlates with the overarching opioid trends of the time. From 2010 to 2015, research questioning the safety of opioids increased and in 2012, national prescriptions claims for opioids began to decrease. More media outlets voiced concerns over the growing opioid epidemic, as well.”

As she and her associates noted in their study, published online Sept. 22 in JAMA Dermatology, sales of opioids skyrocketed, increasing by 400% from 1999 to 2011, while prescription opioid–related deaths exceeded deaths caused by heroin and cocaine combined.

“In 2016, the U.S. Department of Health and Human Services declared the opioid epidemic a public health emergency, and the Centers for Disease Control and Prevention released guidelines to curtail unnecessary opioid prescriptions,” they wrote. “Unfortunately, overdose deaths involving prescription opioids continued to increase even after these measures.”

The researchers drew from Optum Clinformatics Data Mart (Optum CDM), a nationally representative insurance claims database, and limited the analysis to 358,012 adults who underwent Mohs surgery and obtained an opioid prescription within 2 days of surgery in the United States from Jan. 1, 2009, to June 1, 2020. They found that 34.6% of patients underwent Mohs surgery with opioid claims in 2009. This rose to a peak of 39.6% in 2011, then decreased annually to a rate of 11.7% in 2020.

The four opioids obtained most during the study period were hydrocodone (55%), codeine (16.3%), oxycodone (12%), and tramadol (11.6%). However, over time, the proportion of patients who obtained hydrocodone fell 21.7% from a peak of 67.1% in 2011 to 45.4% in 2020, while the proportion of patients who obtained tramadol – generally recognized as a safer option – increased 26.3% from a low of 1.6% in 2009 to 27.9% in 2020.

“The switch from very addictive opioids like hydrocodone and oxycodone to weaker opioids like tramadol was fascinating to see,” said Ms. Veerabagu, who conducted the study during her research fellowship in the department of dermatology at the University of Pennsylvania, Philadelphia. “I remember at first thinking I had coded the data wrong. I reviewed the results with the team to ensure it was correct. We noticed that propoxyphene prescriptions suddenly dropped to 0% in 2011.” She found that the FDA warning in 2010 and recall regarding the use of propoxyphene because of cardiotoxicity correlated with her data, which, “in addition to the thorough review, convinced me that my coding was correct.” Prior to 2011, propoxyphene constituted 28% of prescriptions in 2009 and 24% of prescriptions in 2010.

In an interview, Maryam M. Asgari, MD, professor of dermatology at Harvard Medical School, Boston, said that the findings support recent opioid prescription recommendations following Mohs and other dermatologic procedures from professional societies including those from the American College of Mohs Surgery.

“More awareness has been raised in the past decade regarding the opioid epidemic and the rise of opioid abuse and deaths,” she said. “There has been increased scrutiny on procedures and prescribing of opioids post procedures.”

State-led efforts to lower the number of opioid prescriptions also play a role. For example, in 2016, Massachusetts launched the Massachusetts Prescription Awareness Tool (MassPAT), which imposes a 7-day limit on first-time prescriptions of opioids to patients and mandates that all prescribers check the prescription drug monitoring program before prescribing schedule II or III substances.

“The MassPAT system also gives you quarterly data on how your opioid prescriptions compare with those of your peers within your specialty and subspecialty,” Dr. Asgari said. “If you’re an outlier, I think that quickly leads you to change your prescribing patterns.”

Dr. Asgari noted that most opioids prescribed in the study by Ms. Veerabagu and colleagues were for cancers that arose on the head and neck. “There is still a perception among providers that cancers that arise in those anatomic sites can potentially cause more discomfort for the patient,” she said. “So, knowing more about the degree of pain among the head and neck cases would be an area of knowledge that would help provider behavior down the line.”

Ms. Veerabagu acknowledged certain limitations of the study, including the fact that unfilled prescriptions could not be accounted for, nor could opioids not taken or those obtained without a prescription. “We cannot survey patients in insurance claims database studies, so we have no way of knowing if everyone’s pain was adequately controlled from 2009 to 2020,” she said.

“The main takeaway message is to make sure doctors and patients share an open dialogue,” she added. “Informing patients of the major pros and cons of the appropriate postoperative pain management options available, including opioids’ addiction potential, is crucial. We hope our study adds to the larger continuing conversation of opioid usage within dermatology.”

The study’s senior author was Cerrene N. Giordano, MD, of the department of dermatology at the Hospital of the University of Pennsylvania, Philadelphia. Coauthor Jeremy R. Etzkorn, MD, is supported by a Dermatology Foundation Career Development Award in Dermatologic Surgery; coauthor Megan H. Noe, MD, MPH, reported receiving grants from Boehringer Ingelheim outside the submitted work. Another coauthor, Thuzar M. Shin, MD, PhD, reported receiving grants from Regeneron outside the submitted work. Dr. Asgari disclosed that she has received support from the Melanoma Research Alliance. She also contributes a chapter on skin cancer to UpToDate, for which she receives royalties.

[email protected]

The proportion of patients who obtained an opioid prescription for hydrocodone after Mohs micrographic surgery fell by 21.7% between 2011 and 2020, while the use of tramadol increased by 26.3% between 2009 and 2020, according to a cross-sectional analysis of national insurance claims data.

The findings suggest that dermatologic surgeons generally understood opioid prescription risks and public health warnings about the opioid epidemic, corresponding study author Surya A. Veerabagu said in an interview.

“The frequency of opioid prescriptions after Mohs surgery went up a little bit from 2009 to 2011, but then it subsequently decreased,” said Ms. Veerabagu, a 4th-year student at Tulane University, New Orleans. “It very much correlates with the overarching opioid trends of the time. From 2010 to 2015, research questioning the safety of opioids increased and in 2012, national prescriptions claims for opioids began to decrease. More media outlets voiced concerns over the growing opioid epidemic, as well.”

As she and her associates noted in their study, published online Sept. 22 in JAMA Dermatology, sales of opioids skyrocketed, increasing by 400% from 1999 to 2011, while prescription opioid–related deaths exceeded deaths caused by heroin and cocaine combined.

“In 2016, the U.S. Department of Health and Human Services declared the opioid epidemic a public health emergency, and the Centers for Disease Control and Prevention released guidelines to curtail unnecessary opioid prescriptions,” they wrote. “Unfortunately, overdose deaths involving prescription opioids continued to increase even after these measures.”

The researchers drew from Optum Clinformatics Data Mart (Optum CDM), a nationally representative insurance claims database, and limited the analysis to 358,012 adults who underwent Mohs surgery and obtained an opioid prescription within 2 days of surgery in the United States from Jan. 1, 2009, to June 1, 2020. They found that 34.6% of patients underwent Mohs surgery with opioid claims in 2009. This rose to a peak of 39.6% in 2011, then decreased annually to a rate of 11.7% in 2020.

The four opioids obtained most during the study period were hydrocodone (55%), codeine (16.3%), oxycodone (12%), and tramadol (11.6%). However, over time, the proportion of patients who obtained hydrocodone fell 21.7% from a peak of 67.1% in 2011 to 45.4% in 2020, while the proportion of patients who obtained tramadol – generally recognized as a safer option – increased 26.3% from a low of 1.6% in 2009 to 27.9% in 2020.

“The switch from very addictive opioids like hydrocodone and oxycodone to weaker opioids like tramadol was fascinating to see,” said Ms. Veerabagu, who conducted the study during her research fellowship in the department of dermatology at the University of Pennsylvania, Philadelphia. “I remember at first thinking I had coded the data wrong. I reviewed the results with the team to ensure it was correct. We noticed that propoxyphene prescriptions suddenly dropped to 0% in 2011.” She found that the FDA warning in 2010 and recall regarding the use of propoxyphene because of cardiotoxicity correlated with her data, which, “in addition to the thorough review, convinced me that my coding was correct.” Prior to 2011, propoxyphene constituted 28% of prescriptions in 2009 and 24% of prescriptions in 2010.

In an interview, Maryam M. Asgari, MD, professor of dermatology at Harvard Medical School, Boston, said that the findings support recent opioid prescription recommendations following Mohs and other dermatologic procedures from professional societies including those from the American College of Mohs Surgery.

“More awareness has been raised in the past decade regarding the opioid epidemic and the rise of opioid abuse and deaths,” she said. “There has been increased scrutiny on procedures and prescribing of opioids post procedures.”

State-led efforts to lower the number of opioid prescriptions also play a role. For example, in 2016, Massachusetts launched the Massachusetts Prescription Awareness Tool (MassPAT), which imposes a 7-day limit on first-time prescriptions of opioids to patients and mandates that all prescribers check the prescription drug monitoring program before prescribing schedule II or III substances.

“The MassPAT system also gives you quarterly data on how your opioid prescriptions compare with those of your peers within your specialty and subspecialty,” Dr. Asgari said. “If you’re an outlier, I think that quickly leads you to change your prescribing patterns.”

Dr. Asgari noted that most opioids prescribed in the study by Ms. Veerabagu and colleagues were for cancers that arose on the head and neck. “There is still a perception among providers that cancers that arise in those anatomic sites can potentially cause more discomfort for the patient,” she said. “So, knowing more about the degree of pain among the head and neck cases would be an area of knowledge that would help provider behavior down the line.”

Ms. Veerabagu acknowledged certain limitations of the study, including the fact that unfilled prescriptions could not be accounted for, nor could opioids not taken or those obtained without a prescription. “We cannot survey patients in insurance claims database studies, so we have no way of knowing if everyone’s pain was adequately controlled from 2009 to 2020,” she said.

“The main takeaway message is to make sure doctors and patients share an open dialogue,” she added. “Informing patients of the major pros and cons of the appropriate postoperative pain management options available, including opioids’ addiction potential, is crucial. We hope our study adds to the larger continuing conversation of opioid usage within dermatology.”

The study’s senior author was Cerrene N. Giordano, MD, of the department of dermatology at the Hospital of the University of Pennsylvania, Philadelphia. Coauthor Jeremy R. Etzkorn, MD, is supported by a Dermatology Foundation Career Development Award in Dermatologic Surgery; coauthor Megan H. Noe, MD, MPH, reported receiving grants from Boehringer Ingelheim outside the submitted work. Another coauthor, Thuzar M. Shin, MD, PhD, reported receiving grants from Regeneron outside the submitted work. Dr. Asgari disclosed that she has received support from the Melanoma Research Alliance. She also contributes a chapter on skin cancer to UpToDate, for which she receives royalties.

[email protected]

The proportion of patients who obtained an opioid prescription for hydrocodone after Mohs micrographic surgery fell by 21.7% between 2011 and 2020, while the use of tramadol increased by 26.3% between 2009 and 2020, according to a cross-sectional analysis of national insurance claims data.

The findings suggest that dermatologic surgeons generally understood opioid prescription risks and public health warnings about the opioid epidemic, corresponding study author Surya A. Veerabagu said in an interview.

“The frequency of opioid prescriptions after Mohs surgery went up a little bit from 2009 to 2011, but then it subsequently decreased,” said Ms. Veerabagu, a 4th-year student at Tulane University, New Orleans. “It very much correlates with the overarching opioid trends of the time. From 2010 to 2015, research questioning the safety of opioids increased and in 2012, national prescriptions claims for opioids began to decrease. More media outlets voiced concerns over the growing opioid epidemic, as well.”

As she and her associates noted in their study, published online Sept. 22 in JAMA Dermatology, sales of opioids skyrocketed, increasing by 400% from 1999 to 2011, while prescription opioid–related deaths exceeded deaths caused by heroin and cocaine combined.

“In 2016, the U.S. Department of Health and Human Services declared the opioid epidemic a public health emergency, and the Centers for Disease Control and Prevention released guidelines to curtail unnecessary opioid prescriptions,” they wrote. “Unfortunately, overdose deaths involving prescription opioids continued to increase even after these measures.”

The researchers drew from Optum Clinformatics Data Mart (Optum CDM), a nationally representative insurance claims database, and limited the analysis to 358,012 adults who underwent Mohs surgery and obtained an opioid prescription within 2 days of surgery in the United States from Jan. 1, 2009, to June 1, 2020. They found that 34.6% of patients underwent Mohs surgery with opioid claims in 2009. This rose to a peak of 39.6% in 2011, then decreased annually to a rate of 11.7% in 2020.

The four opioids obtained most during the study period were hydrocodone (55%), codeine (16.3%), oxycodone (12%), and tramadol (11.6%). However, over time, the proportion of patients who obtained hydrocodone fell 21.7% from a peak of 67.1% in 2011 to 45.4% in 2020, while the proportion of patients who obtained tramadol – generally recognized as a safer option – increased 26.3% from a low of 1.6% in 2009 to 27.9% in 2020.

“The switch from very addictive opioids like hydrocodone and oxycodone to weaker opioids like tramadol was fascinating to see,” said Ms. Veerabagu, who conducted the study during her research fellowship in the department of dermatology at the University of Pennsylvania, Philadelphia. “I remember at first thinking I had coded the data wrong. I reviewed the results with the team to ensure it was correct. We noticed that propoxyphene prescriptions suddenly dropped to 0% in 2011.” She found that the FDA warning in 2010 and recall regarding the use of propoxyphene because of cardiotoxicity correlated with her data, which, “in addition to the thorough review, convinced me that my coding was correct.” Prior to 2011, propoxyphene constituted 28% of prescriptions in 2009 and 24% of prescriptions in 2010.

In an interview, Maryam M. Asgari, MD, professor of dermatology at Harvard Medical School, Boston, said that the findings support recent opioid prescription recommendations following Mohs and other dermatologic procedures from professional societies including those from the American College of Mohs Surgery.

“More awareness has been raised in the past decade regarding the opioid epidemic and the rise of opioid abuse and deaths,” she said. “There has been increased scrutiny on procedures and prescribing of opioids post procedures.”

State-led efforts to lower the number of opioid prescriptions also play a role. For example, in 2016, Massachusetts launched the Massachusetts Prescription Awareness Tool (MassPAT), which imposes a 7-day limit on first-time prescriptions of opioids to patients and mandates that all prescribers check the prescription drug monitoring program before prescribing schedule II or III substances.

“The MassPAT system also gives you quarterly data on how your opioid prescriptions compare with those of your peers within your specialty and subspecialty,” Dr. Asgari said. “If you’re an outlier, I think that quickly leads you to change your prescribing patterns.”

Dr. Asgari noted that most opioids prescribed in the study by Ms. Veerabagu and colleagues were for cancers that arose on the head and neck. “There is still a perception among providers that cancers that arise in those anatomic sites can potentially cause more discomfort for the patient,” she said. “So, knowing more about the degree of pain among the head and neck cases would be an area of knowledge that would help provider behavior down the line.”

Ms. Veerabagu acknowledged certain limitations of the study, including the fact that unfilled prescriptions could not be accounted for, nor could opioids not taken or those obtained without a prescription. “We cannot survey patients in insurance claims database studies, so we have no way of knowing if everyone’s pain was adequately controlled from 2009 to 2020,” she said.

“The main takeaway message is to make sure doctors and patients share an open dialogue,” she added. “Informing patients of the major pros and cons of the appropriate postoperative pain management options available, including opioids’ addiction potential, is crucial. We hope our study adds to the larger continuing conversation of opioid usage within dermatology.”

The study’s senior author was Cerrene N. Giordano, MD, of the department of dermatology at the Hospital of the University of Pennsylvania, Philadelphia. Coauthor Jeremy R. Etzkorn, MD, is supported by a Dermatology Foundation Career Development Award in Dermatologic Surgery; coauthor Megan H. Noe, MD, MPH, reported receiving grants from Boehringer Ingelheim outside the submitted work. Another coauthor, Thuzar M. Shin, MD, PhD, reported receiving grants from Regeneron outside the submitted work. Dr. Asgari disclosed that she has received support from the Melanoma Research Alliance. She also contributes a chapter on skin cancer to UpToDate, for which she receives royalties.

[email protected]

The Food and Drug Administration has approved atogepant (Qulipta), a novel calcitonin gene-related peptide (CGRP) receptor antagonist, for the prevention of episodic migraine, the manufacturer announced in a release.

The once-daily medication will be available in doses of 10 mg, 30 mg, and 60 mg.

“Qulipta provides a simple oral treatment option specifically developed to prevent migraine attacks and target CGRP, which is believed to be crucially involved in migraine in many patients,” coinvestigator Peter J. Goadsby, MD, PhD, DSc, neurologist and professor at the University of California, Los Angeles, and King’s College London, said in the release.

Approval was based partly on the findings from the phase 3 ADVANCE trial, in which patients with episodic migraine were randomly assigned to receive placebo or a 10-mg, 30-mg, or 60-mg daily dose of atogepant for 12 weeks.

As reported by this news organization, all three doses of atogepant reduced the number of mean monthly migraine days.

With this approval, neurologists will be able to choose from four monoclonal antibodies and two gepants for the preventive treatment of migraine.

“Having another gepant that can also be given preventively is a good idea, because one may be better than the other for a patient,” Alan M. Rapoport, MD, past president of the International Headache Society and founder and director emeritus of the New England Center for Headache, Stamford, Conn., told this news organization.

“Once we have a year or so of experience with atogepant, we’ll have a pretty good idea of which one works better preventively,” said Dr. Rapoport, who was not involved with the research.
 

Practice changing?

In the ADVANCE trial, there was a reduction of 3.69 migraine days with the 10-mg dose, 3.86 days with the 30-mg dose, and 4.2 days with the 60-mg dose. Placebo was associated with a reduction of 2.48 migraine days.

In addition, more than half of patients in each atogepant arm achieved a reduction in mean monthly migraine days of 50% or greater. This outcome occurred in 55.6% of the 10-mg atogepant group, 58.7% of the 30-mg group, and 60.8% of the 60-mg group. Approximately 29% patients who received placebo achieved this outcome.

The data indicated that atogepant has a favorable safety profile. The most common adverse events associated with treatment were constipation, nausea, and upper respiratory tract infection.

Dr. Rapoport, who is also a clinical professor of neurology at UCLA, noted that he was impressed with the efficacy.

“I’m not as impressed with the adverse events, but they’re not serious, and they don’t necessarily last,” he said.

Although being able to prescribe a single drug for acute and preventive treatment may be an advantage, it remains to be seen whether the tolerability and price of atogepant will be barriers for patients, Dr. Rapoport added.

How the approval will affect clinical practice is also unclear, he noted.

“If you’re going to start someone on a preventive, especially if it’s a woman of childbearing potential, you might just consider one of the two gepants. Doctors will decide once they see how they work,” said Dr. Rapoport.
 

Not a ‘breakthrough’ treatment

Also commenting ahead of the approval, Elizabeth W. Loder, MD, vice chair for academic affairs in the department of neurology at Brigham and Women’s Hospital, Boston, noted that the “safety of these CGRP medications in pregnancy is uncertain, and there are theoretical reasons to be concerned about it.”

Unlike injectable CGRP medications, atogepant is eliminated from the body relatively quickly after the patient stops taking it, said Dr. Loder, who is also professor of neurology at Harvard Medical School, Boston. However, atogepant may not otherwise differ greatly from other medications of its type.

“I don’t see a reason to think that one of these oral CGRP medicines is much more effective than another one,” said Dr. Loder.

“In my mind, as a clinician who will be prescribing these for patients, it will be cost and the ease of getting it covered that makes the difference,” she added.

These questions may raise concerns. “Those of us who treat patients who do not have private insurance find it very difficult to get these medications for them, even in situations where they have exhausted other alternatives,” said Dr. Loder.

Patients insured by Medicare or Medicaid “usually have no avenue to get some of these new, expensive treatments,” she said.

The approval of atogepant for acute and preventive treatment shows that the distinction between these indications may be artificial, Dr. Loder noted. The approval “will, I hope, help people think more flexibly about the way in which we use medications.”

It is a positive that atogepant has emerged as another option for preventive therapy, but the treatment cannot be considered a breakthrough, Dr. Loder added. The efficacy of atogepant, like that of other preventive treatments for migraine, is modest.

“It would be so nice if we could find things that were more effective than the treatments we currently have,” said Dr. Loder.

A version of this article first appeared on Medscape.com.

The Food and Drug Administration has approved atogepant (Qulipta), a novel calcitonin gene-related peptide (CGRP) receptor antagonist, for the prevention of episodic migraine, the manufacturer announced in a release.

The once-daily medication will be available in doses of 10 mg, 30 mg, and 60 mg.

“Qulipta provides a simple oral treatment option specifically developed to prevent migraine attacks and target CGRP, which is believed to be crucially involved in migraine in many patients,” coinvestigator Peter J. Goadsby, MD, PhD, DSc, neurologist and professor at the University of California, Los Angeles, and King’s College London, said in the release.

Approval was based partly on the findings from the phase 3 ADVANCE trial, in which patients with episodic migraine were randomly assigned to receive placebo or a 10-mg, 30-mg, or 60-mg daily dose of atogepant for 12 weeks.

As reported by this news organization, all three doses of atogepant reduced the number of mean monthly migraine days.

With this approval, neurologists will be able to choose from four monoclonal antibodies and two gepants for the preventive treatment of migraine.

“Having another gepant that can also be given preventively is a good idea, because one may be better than the other for a patient,” Alan M. Rapoport, MD, past president of the International Headache Society and founder and director emeritus of the New England Center for Headache, Stamford, Conn., told this news organization.

“Once we have a year or so of experience with atogepant, we’ll have a pretty good idea of which one works better preventively,” said Dr. Rapoport, who was not involved with the research.
 

Practice changing?

In the ADVANCE trial, there was a reduction of 3.69 migraine days with the 10-mg dose, 3.86 days with the 30-mg dose, and 4.2 days with the 60-mg dose. Placebo was associated with a reduction of 2.48 migraine days.

In addition, more than half of patients in each atogepant arm achieved a reduction in mean monthly migraine days of 50% or greater. This outcome occurred in 55.6% of the 10-mg atogepant group, 58.7% of the 30-mg group, and 60.8% of the 60-mg group. Approximately 29% patients who received placebo achieved this outcome.

The data indicated that atogepant has a favorable safety profile. The most common adverse events associated with treatment were constipation, nausea, and upper respiratory tract infection.

Dr. Rapoport, who is also a clinical professor of neurology at UCLA, noted that he was impressed with the efficacy.

“I’m not as impressed with the adverse events, but they’re not serious, and they don’t necessarily last,” he said.

Although being able to prescribe a single drug for acute and preventive treatment may be an advantage, it remains to be seen whether the tolerability and price of atogepant will be barriers for patients, Dr. Rapoport added.

How the approval will affect clinical practice is also unclear, he noted.

“If you’re going to start someone on a preventive, especially if it’s a woman of childbearing potential, you might just consider one of the two gepants. Doctors will decide once they see how they work,” said Dr. Rapoport.
 

Not a ‘breakthrough’ treatment

Also commenting ahead of the approval, Elizabeth W. Loder, MD, vice chair for academic affairs in the department of neurology at Brigham and Women’s Hospital, Boston, noted that the “safety of these CGRP medications in pregnancy is uncertain, and there are theoretical reasons to be concerned about it.”

Unlike injectable CGRP medications, atogepant is eliminated from the body relatively quickly after the patient stops taking it, said Dr. Loder, who is also professor of neurology at Harvard Medical School, Boston. However, atogepant may not otherwise differ greatly from other medications of its type.

“I don’t see a reason to think that one of these oral CGRP medicines is much more effective than another one,” said Dr. Loder.

“In my mind, as a clinician who will be prescribing these for patients, it will be cost and the ease of getting it covered that makes the difference,” she added.

These questions may raise concerns. “Those of us who treat patients who do not have private insurance find it very difficult to get these medications for them, even in situations where they have exhausted other alternatives,” said Dr. Loder.

Patients insured by Medicare or Medicaid “usually have no avenue to get some of these new, expensive treatments,” she said.

The approval of atogepant for acute and preventive treatment shows that the distinction between these indications may be artificial, Dr. Loder noted. The approval “will, I hope, help people think more flexibly about the way in which we use medications.”

It is a positive that atogepant has emerged as another option for preventive therapy, but the treatment cannot be considered a breakthrough, Dr. Loder added. The efficacy of atogepant, like that of other preventive treatments for migraine, is modest.

“It would be so nice if we could find things that were more effective than the treatments we currently have,” said Dr. Loder.

A version of this article first appeared on Medscape.com.

The Food and Drug Administration has approved atogepant (Qulipta), a novel calcitonin gene-related peptide (CGRP) receptor antagonist, for the prevention of episodic migraine, the manufacturer announced in a release.

The once-daily medication will be available in doses of 10 mg, 30 mg, and 60 mg.

“Qulipta provides a simple oral treatment option specifically developed to prevent migraine attacks and target CGRP, which is believed to be crucially involved in migraine in many patients,” coinvestigator Peter J. Goadsby, MD, PhD, DSc, neurologist and professor at the University of California, Los Angeles, and King’s College London, said in the release.

Approval was based partly on the findings from the phase 3 ADVANCE trial, in which patients with episodic migraine were randomly assigned to receive placebo or a 10-mg, 30-mg, or 60-mg daily dose of atogepant for 12 weeks.

As reported by this news organization, all three doses of atogepant reduced the number of mean monthly migraine days.

With this approval, neurologists will be able to choose from four monoclonal antibodies and two gepants for the preventive treatment of migraine.

“Having another gepant that can also be given preventively is a good idea, because one may be better than the other for a patient,” Alan M. Rapoport, MD, past president of the International Headache Society and founder and director emeritus of the New England Center for Headache, Stamford, Conn., told this news organization.

“Once we have a year or so of experience with atogepant, we’ll have a pretty good idea of which one works better preventively,” said Dr. Rapoport, who was not involved with the research.
 

Practice changing?

In the ADVANCE trial, there was a reduction of 3.69 migraine days with the 10-mg dose, 3.86 days with the 30-mg dose, and 4.2 days with the 60-mg dose. Placebo was associated with a reduction of 2.48 migraine days.

In addition, more than half of patients in each atogepant arm achieved a reduction in mean monthly migraine days of 50% or greater. This outcome occurred in 55.6% of the 10-mg atogepant group, 58.7% of the 30-mg group, and 60.8% of the 60-mg group. Approximately 29% patients who received placebo achieved this outcome.

The data indicated that atogepant has a favorable safety profile. The most common adverse events associated with treatment were constipation, nausea, and upper respiratory tract infection.

Dr. Rapoport, who is also a clinical professor of neurology at UCLA, noted that he was impressed with the efficacy.

“I’m not as impressed with the adverse events, but they’re not serious, and they don’t necessarily last,” he said.

Although being able to prescribe a single drug for acute and preventive treatment may be an advantage, it remains to be seen whether the tolerability and price of atogepant will be barriers for patients, Dr. Rapoport added.

How the approval will affect clinical practice is also unclear, he noted.

“If you’re going to start someone on a preventive, especially if it’s a woman of childbearing potential, you might just consider one of the two gepants. Doctors will decide once they see how they work,” said Dr. Rapoport.
 

Not a ‘breakthrough’ treatment

Also commenting ahead of the approval, Elizabeth W. Loder, MD, vice chair for academic affairs in the department of neurology at Brigham and Women’s Hospital, Boston, noted that the “safety of these CGRP medications in pregnancy is uncertain, and there are theoretical reasons to be concerned about it.”

Unlike injectable CGRP medications, atogepant is eliminated from the body relatively quickly after the patient stops taking it, said Dr. Loder, who is also professor of neurology at Harvard Medical School, Boston. However, atogepant may not otherwise differ greatly from other medications of its type.

“I don’t see a reason to think that one of these oral CGRP medicines is much more effective than another one,” said Dr. Loder.

“In my mind, as a clinician who will be prescribing these for patients, it will be cost and the ease of getting it covered that makes the difference,” she added.

These questions may raise concerns. “Those of us who treat patients who do not have private insurance find it very difficult to get these medications for them, even in situations where they have exhausted other alternatives,” said Dr. Loder.

Patients insured by Medicare or Medicaid “usually have no avenue to get some of these new, expensive treatments,” she said.

The approval of atogepant for acute and preventive treatment shows that the distinction between these indications may be artificial, Dr. Loder noted. The approval “will, I hope, help people think more flexibly about the way in which we use medications.”

It is a positive that atogepant has emerged as another option for preventive therapy, but the treatment cannot be considered a breakthrough, Dr. Loder added. The efficacy of atogepant, like that of other preventive treatments for migraine, is modest.

“It would be so nice if we could find things that were more effective than the treatments we currently have,” said Dr. Loder.

A version of this article first appeared on Medscape.com.

The U.S. Drug Enforcement Administration has issued a public safety alert over an “alarming” increase in fake prescription pills laced with the synthetic opioid fentanyl or the stimulant methamphetamine.

“The United States is facing an unprecedented crisis of overdose deaths fueled by illegally manufactured fentanyl and methamphetamine,” DEA Administrator Anne Milgram said in the alert.

“Counterfeit pills that contain these dangerous and extremely addictive drugs are more lethal and more accessible than ever before. DEA is focusing resources on taking down the violent drug traffickers causing the greatest harm and posing the greatest threat to the safety and health of Americans,” Ms. Milgram said.

Criminal drug networks are mass-producing fake fentanyl- and methamphetamine-laced pills and deceptively marketing them as legitimate prescription pills, the DEA warns.

These lethal counterfeit pills are made to look like legitimate prescription opioid medications such as oxycodone (Oxycontin, Percocet), hydrocodone (Vicodin), and alprazolam (Xanax); or stimulants like amphetamines (Adderall).

The agency has seized fake pills in every U.S. state. More than 9.5 million fake pills have been seized so far this year – more than the last 2 years combined.

The number of seized counterfeit pills with fentanyl has jumped nearly 430% since 2019. DEA lab tests reveal that two out of every five pills with fentanyl contain a potentially lethal dose.

These deadly pills are widely accessible and often sold on social media and e-commerce platforms – making them available to anyone with a smartphone, including minors, the DEA warns.

More than 93,000 people died of a drug overdose in the United States last year, according to federal statistics, and fentanyl is the primary driver of this alarming increase in overdose deaths, the DEA says.

The agency has launched a “One Pill Can Kill” public awareness campaign to educate the public of the dangers of counterfeit pills purchased outside of a licensed pharmacy. These pills are “illegal, dangerous, and potentially lethal,” the DEA warns.

This alert does not apply to legitimate pharmaceutical medications prescribed by doctors and dispensed by licensed pharmacists, the DEA says.

“The legitimate prescription supply chain is not impacted. Anyone filling a prescription at a licensed pharmacy can be confident that the medications they receive are safe when taken as directed by a medical professional,” the agency says.

A version of this article first appeared on Medscape.com.

The U.S. Drug Enforcement Administration has issued a public safety alert over an “alarming” increase in fake prescription pills laced with the synthetic opioid fentanyl or the stimulant methamphetamine.

“The United States is facing an unprecedented crisis of overdose deaths fueled by illegally manufactured fentanyl and methamphetamine,” DEA Administrator Anne Milgram said in the alert.

“Counterfeit pills that contain these dangerous and extremely addictive drugs are more lethal and more accessible than ever before. DEA is focusing resources on taking down the violent drug traffickers causing the greatest harm and posing the greatest threat to the safety and health of Americans,” Ms. Milgram said.

Criminal drug networks are mass-producing fake fentanyl- and methamphetamine-laced pills and deceptively marketing them as legitimate prescription pills, the DEA warns.

These lethal counterfeit pills are made to look like legitimate prescription opioid medications such as oxycodone (Oxycontin, Percocet), hydrocodone (Vicodin), and alprazolam (Xanax); or stimulants like amphetamines (Adderall).

The agency has seized fake pills in every U.S. state. More than 9.5 million fake pills have been seized so far this year – more than the last 2 years combined.

The number of seized counterfeit pills with fentanyl has jumped nearly 430% since 2019. DEA lab tests reveal that two out of every five pills with fentanyl contain a potentially lethal dose.

These deadly pills are widely accessible and often sold on social media and e-commerce platforms – making them available to anyone with a smartphone, including minors, the DEA warns.

More than 93,000 people died of a drug overdose in the United States last year, according to federal statistics, and fentanyl is the primary driver of this alarming increase in overdose deaths, the DEA says.

The agency has launched a “One Pill Can Kill” public awareness campaign to educate the public of the dangers of counterfeit pills purchased outside of a licensed pharmacy. These pills are “illegal, dangerous, and potentially lethal,” the DEA warns.

This alert does not apply to legitimate pharmaceutical medications prescribed by doctors and dispensed by licensed pharmacists, the DEA says.

“The legitimate prescription supply chain is not impacted. Anyone filling a prescription at a licensed pharmacy can be confident that the medications they receive are safe when taken as directed by a medical professional,” the agency says.

A version of this article first appeared on Medscape.com.

The U.S. Drug Enforcement Administration has issued a public safety alert over an “alarming” increase in fake prescription pills laced with the synthetic opioid fentanyl or the stimulant methamphetamine.

“The United States is facing an unprecedented crisis of overdose deaths fueled by illegally manufactured fentanyl and methamphetamine,” DEA Administrator Anne Milgram said in the alert.

“Counterfeit pills that contain these dangerous and extremely addictive drugs are more lethal and more accessible than ever before. DEA is focusing resources on taking down the violent drug traffickers causing the greatest harm and posing the greatest threat to the safety and health of Americans,” Ms. Milgram said.

Criminal drug networks are mass-producing fake fentanyl- and methamphetamine-laced pills and deceptively marketing them as legitimate prescription pills, the DEA warns.

These lethal counterfeit pills are made to look like legitimate prescription opioid medications such as oxycodone (Oxycontin, Percocet), hydrocodone (Vicodin), and alprazolam (Xanax); or stimulants like amphetamines (Adderall).

The agency has seized fake pills in every U.S. state. More than 9.5 million fake pills have been seized so far this year – more than the last 2 years combined.

The number of seized counterfeit pills with fentanyl has jumped nearly 430% since 2019. DEA lab tests reveal that two out of every five pills with fentanyl contain a potentially lethal dose.

These deadly pills are widely accessible and often sold on social media and e-commerce platforms – making them available to anyone with a smartphone, including minors, the DEA warns.

More than 93,000 people died of a drug overdose in the United States last year, according to federal statistics, and fentanyl is the primary driver of this alarming increase in overdose deaths, the DEA says.

The agency has launched a “One Pill Can Kill” public awareness campaign to educate the public of the dangers of counterfeit pills purchased outside of a licensed pharmacy. These pills are “illegal, dangerous, and potentially lethal,” the DEA warns.

This alert does not apply to legitimate pharmaceutical medications prescribed by doctors and dispensed by licensed pharmacists, the DEA says.

“The legitimate prescription supply chain is not impacted. Anyone filling a prescription at a licensed pharmacy can be confident that the medications they receive are safe when taken as directed by a medical professional,” the agency says.

A version of this article first appeared on Medscape.com.

Pregnant women should use paracetamol/acetaminophen only with a medical indication and at the lowest effective dose for the shortest possible time, according to an international consensus statement published online Sept. 23 in Nature Reviews Endocrinology.

With global rates of use high and risks considered negligible, the expert panel of 13 U.S. and European authors call for focused research into how this analgesic and febrifuge may impair fetal development and lead to adverse outcomes in children. They outline several precautionary measures to be taken in the meantime.

According to first author and epidemiologist Ann Z. Bauer, ScD, a postdoctoral research fellow at the University of Massachusetts in Lowell, and colleagues, this drug is used by an estimated 65% of pregnant women in the United States, and more than 50% worldwide. It is currently the active ingredient in more than 600 prescription and nonprescription medications, including Tylenol, which historically has been deemed safe in all trimesters of pregnancy.

But a growing body of experimental and epidemiological evidence suggests prenatal exposure to paracetamol (N-acetyl-p-aminophenol, or APAP) might alter fetal development and elevate the risks of neurodevelopmental, reproductive and urogenital disorders in both sexes. Exposure in utero has been linked, for example, to potential behavioral problems in children.

The new recommendations are based on a review of experimental animal and cell-based research as well as human epidemiological data published from January 1995 to October 2020. The authors include clinicians, epidemiologists, and scientists specializing in toxicology, endocrinology, reproductive medicine and neurodevelopment.
 

Recommendations

Although the new guidance does not differ markedly from current advice, the authors believe stronger communication and greater awareness of risks are needed. In addition to restricting use of this medication to low doses for short periods when medically necessary, expectant mothers should receive counseling before conception or early in pregnancy. If uncertain about its use, they should consult their physicians or pharmacists.

In other recommendations, the panel said:

• The 2015 FDA Drug Safety Communication recommendations should be updated based on evaluation of all available scientific evidence.
• The European Medicines Agency Pharmacovigilance Risk Assessment Committee should review the most recent epidemiologic and experimental research and issue an updated Drug Safety Communication.
• Obstetric and gynecological associations should update their guidance after reviewing all available research.
• The Acetaminophen Awareness Coalition (“Know Your Dose” Campaign) should add standardized warnings and specifically advise pregnant women to forgo APAP unless it’s medically indicated.
• All sales of APAP-containing medications should be accompanied by recommendations specifically for use in pregnancy. This information should include warning labels on packaging, and if possible, APAP should be sold only in pharmacies (as in France).

Mechanism of action

APAP is an endocrine disruptor (Neuroscientist. 2020 Sep 11. doi: 10.1177/1073858420952046). “Chemicals that disrupt the endocrine system are concerning because they can interfere with the activity of endogenous hormones that are essential for healthy neurological, urogenital, and reproductive development,” researchers wrote.

“The precise mechanism is not clear but its toxicity is thought to be due mainly to hormone disruption,” Dr. Bauer said in an interview.

Moreover, APAP readily crosses the placenta and blood–brain barrier, and changes in APAP metabolism during pregnancy might make women and their fetuses more vulnerable to its toxic effects. For instance, the molar dose fraction of APAP converted to the oxidative metabolite N-acetyl-p-benzoquinone imine increases during pregnancy. In addition to its hepatotoxicity, this poisonous byproduct is thought to be a genotoxin that increases DNA cleavage by acting on the enzyme topoisomerase II.

Asked for her perspective on the statement, Kjersti Aagaard, MD, PhD, a professor of obstetrics and gynecology at Baylor College of Medicine and Texas Children’s Hospital in Houston, called the expert panel’s statement thoughtful and comprehensive, but she urged caution in interpreting the role of acetaminophen.

The challenge in linking any commonly used medication to adverse effects and congenital defects, she said, is “teasing out an association from causation. Given the commonality of the use of acetaminophen with the relative rarity of the outcomes, it is clear that not all cases of exposure result in adverse outcomes.”

As for judicious use, she said, one would be to reduce a high fever, which can cause miscarriage, neural tube defects, and potential heart disease in adulthood. Acetaminophen is the drug of choice in this case since nonsteroidal anti-inflammatory drugs such as ibuprofen are not recommended owing to their known risks to the fetal heart.

Dr. Aagaard emphasized that while acetaminophen use is temporally associated with learning and behavioral problems, and urogenital disorders at birth in male infants such as like hypospadias, so is exposure to multiple environmental chemicals and pollutants, as well as climate change. “It would be a real mistake with real life implications if we associated any congenital disease or disorder with a commonly used medication with known benefits if the true causal link lies elsewhere.”

She said the precautionary statements fall into the time-honored therapeutic principle of first do no harm. “However, the call for research action must be undertaken earnestly and sincerely.”

According to Dr. Bauer, the statement’s essential take-home message is that “physicians should educate themselves and educate women about what we’re learning about the risks of acetaminophen in pregnancy.” Risk can be minimized by using the lowest effective dose for the shortest time and only when medically indicated. “Pregnant women should speak to their physicians about acetaminophen. It’s about empowerment and making smart decisions,” she said.

This study received no specific funding. Coauthor Dr. R.T. Mitchell is supported by a UK Research Institute fellowship.

Pregnant women should use paracetamol/acetaminophen only with a medical indication and at the lowest effective dose for the shortest possible time, according to an international consensus statement published online Sept. 23 in Nature Reviews Endocrinology.

With global rates of use high and risks considered negligible, the expert panel of 13 U.S. and European authors call for focused research into how this analgesic and febrifuge may impair fetal development and lead to adverse outcomes in children. They outline several precautionary measures to be taken in the meantime.

According to first author and epidemiologist Ann Z. Bauer, ScD, a postdoctoral research fellow at the University of Massachusetts in Lowell, and colleagues, this drug is used by an estimated 65% of pregnant women in the United States, and more than 50% worldwide. It is currently the active ingredient in more than 600 prescription and nonprescription medications, including Tylenol, which historically has been deemed safe in all trimesters of pregnancy.

But a growing body of experimental and epidemiological evidence suggests prenatal exposure to paracetamol (N-acetyl-p-aminophenol, or APAP) might alter fetal development and elevate the risks of neurodevelopmental, reproductive and urogenital disorders in both sexes. Exposure in utero has been linked, for example, to potential behavioral problems in children.

The new recommendations are based on a review of experimental animal and cell-based research as well as human epidemiological data published from January 1995 to October 2020. The authors include clinicians, epidemiologists, and scientists specializing in toxicology, endocrinology, reproductive medicine and neurodevelopment.
 

Recommendations

Although the new guidance does not differ markedly from current advice, the authors believe stronger communication and greater awareness of risks are needed. In addition to restricting use of this medication to low doses for short periods when medically necessary, expectant mothers should receive counseling before conception or early in pregnancy. If uncertain about its use, they should consult their physicians or pharmacists.

In other recommendations, the panel said:

• The 2015 FDA Drug Safety Communication recommendations should be updated based on evaluation of all available scientific evidence.
• The European Medicines Agency Pharmacovigilance Risk Assessment Committee should review the most recent epidemiologic and experimental research and issue an updated Drug Safety Communication.
• Obstetric and gynecological associations should update their guidance after reviewing all available research.
• The Acetaminophen Awareness Coalition (“Know Your Dose” Campaign) should add standardized warnings and specifically advise pregnant women to forgo APAP unless it’s medically indicated.
• All sales of APAP-containing medications should be accompanied by recommendations specifically for use in pregnancy. This information should include warning labels on packaging, and if possible, APAP should be sold only in pharmacies (as in France).

Mechanism of action

APAP is an endocrine disruptor (Neuroscientist. 2020 Sep 11. doi: 10.1177/1073858420952046). “Chemicals that disrupt the endocrine system are concerning because they can interfere with the activity of endogenous hormones that are essential for healthy neurological, urogenital, and reproductive development,” researchers wrote.

“The precise mechanism is not clear but its toxicity is thought to be due mainly to hormone disruption,” Dr. Bauer said in an interview.

Moreover, APAP readily crosses the placenta and blood–brain barrier, and changes in APAP metabolism during pregnancy might make women and their fetuses more vulnerable to its toxic effects. For instance, the molar dose fraction of APAP converted to the oxidative metabolite N-acetyl-p-benzoquinone imine increases during pregnancy. In addition to its hepatotoxicity, this poisonous byproduct is thought to be a genotoxin that increases DNA cleavage by acting on the enzyme topoisomerase II.

Asked for her perspective on the statement, Kjersti Aagaard, MD, PhD, a professor of obstetrics and gynecology at Baylor College of Medicine and Texas Children’s Hospital in Houston, called the expert panel’s statement thoughtful and comprehensive, but she urged caution in interpreting the role of acetaminophen.

The challenge in linking any commonly used medication to adverse effects and congenital defects, she said, is “teasing out an association from causation. Given the commonality of the use of acetaminophen with the relative rarity of the outcomes, it is clear that not all cases of exposure result in adverse outcomes.”

As for judicious use, she said, one would be to reduce a high fever, which can cause miscarriage, neural tube defects, and potential heart disease in adulthood. Acetaminophen is the drug of choice in this case since nonsteroidal anti-inflammatory drugs such as ibuprofen are not recommended owing to their known risks to the fetal heart.

Dr. Aagaard emphasized that while acetaminophen use is temporally associated with learning and behavioral problems, and urogenital disorders at birth in male infants such as like hypospadias, so is exposure to multiple environmental chemicals and pollutants, as well as climate change. “It would be a real mistake with real life implications if we associated any congenital disease or disorder with a commonly used medication with known benefits if the true causal link lies elsewhere.”

She said the precautionary statements fall into the time-honored therapeutic principle of first do no harm. “However, the call for research action must be undertaken earnestly and sincerely.”

According to Dr. Bauer, the statement’s essential take-home message is that “physicians should educate themselves and educate women about what we’re learning about the risks of acetaminophen in pregnancy.” Risk can be minimized by using the lowest effective dose for the shortest time and only when medically indicated. “Pregnant women should speak to their physicians about acetaminophen. It’s about empowerment and making smart decisions,” she said.

This study received no specific funding. Coauthor Dr. R.T. Mitchell is supported by a UK Research Institute fellowship.

Pregnant women should use paracetamol/acetaminophen only with a medical indication and at the lowest effective dose for the shortest possible time, according to an international consensus statement published online Sept. 23 in Nature Reviews Endocrinology.

With global rates of use high and risks considered negligible, the expert panel of 13 U.S. and European authors call for focused research into how this analgesic and febrifuge may impair fetal development and lead to adverse outcomes in children. They outline several precautionary measures to be taken in the meantime.

According to first author and epidemiologist Ann Z. Bauer, ScD, a postdoctoral research fellow at the University of Massachusetts in Lowell, and colleagues, this drug is used by an estimated 65% of pregnant women in the United States, and more than 50% worldwide. It is currently the active ingredient in more than 600 prescription and nonprescription medications, including Tylenol, which historically has been deemed safe in all trimesters of pregnancy.

But a growing body of experimental and epidemiological evidence suggests prenatal exposure to paracetamol (N-acetyl-p-aminophenol, or APAP) might alter fetal development and elevate the risks of neurodevelopmental, reproductive and urogenital disorders in both sexes. Exposure in utero has been linked, for example, to potential behavioral problems in children.

The new recommendations are based on a review of experimental animal and cell-based research as well as human epidemiological data published from January 1995 to October 2020. The authors include clinicians, epidemiologists, and scientists specializing in toxicology, endocrinology, reproductive medicine and neurodevelopment.
 

Recommendations

Although the new guidance does not differ markedly from current advice, the authors believe stronger communication and greater awareness of risks are needed. In addition to restricting use of this medication to low doses for short periods when medically necessary, expectant mothers should receive counseling before conception or early in pregnancy. If uncertain about its use, they should consult their physicians or pharmacists.

In other recommendations, the panel said:

• The 2015 FDA Drug Safety Communication recommendations should be updated based on evaluation of all available scientific evidence.
• The European Medicines Agency Pharmacovigilance Risk Assessment Committee should review the most recent epidemiologic and experimental research and issue an updated Drug Safety Communication.
• Obstetric and gynecological associations should update their guidance after reviewing all available research.
• The Acetaminophen Awareness Coalition (“Know Your Dose” Campaign) should add standardized warnings and specifically advise pregnant women to forgo APAP unless it’s medically indicated.
• All sales of APAP-containing medications should be accompanied by recommendations specifically for use in pregnancy. This information should include warning labels on packaging, and if possible, APAP should be sold only in pharmacies (as in France).

Mechanism of action

APAP is an endocrine disruptor (Neuroscientist. 2020 Sep 11. doi: 10.1177/1073858420952046). “Chemicals that disrupt the endocrine system are concerning because they can interfere with the activity of endogenous hormones that are essential for healthy neurological, urogenital, and reproductive development,” researchers wrote.

“The precise mechanism is not clear but its toxicity is thought to be due mainly to hormone disruption,” Dr. Bauer said in an interview.

Moreover, APAP readily crosses the placenta and blood–brain barrier, and changes in APAP metabolism during pregnancy might make women and their fetuses more vulnerable to its toxic effects. For instance, the molar dose fraction of APAP converted to the oxidative metabolite N-acetyl-p-benzoquinone imine increases during pregnancy. In addition to its hepatotoxicity, this poisonous byproduct is thought to be a genotoxin that increases DNA cleavage by acting on the enzyme topoisomerase II.

Asked for her perspective on the statement, Kjersti Aagaard, MD, PhD, a professor of obstetrics and gynecology at Baylor College of Medicine and Texas Children’s Hospital in Houston, called the expert panel’s statement thoughtful and comprehensive, but she urged caution in interpreting the role of acetaminophen.

The challenge in linking any commonly used medication to adverse effects and congenital defects, she said, is “teasing out an association from causation. Given the commonality of the use of acetaminophen with the relative rarity of the outcomes, it is clear that not all cases of exposure result in adverse outcomes.”

As for judicious use, she said, one would be to reduce a high fever, which can cause miscarriage, neural tube defects, and potential heart disease in adulthood. Acetaminophen is the drug of choice in this case since nonsteroidal anti-inflammatory drugs such as ibuprofen are not recommended owing to their known risks to the fetal heart.

Dr. Aagaard emphasized that while acetaminophen use is temporally associated with learning and behavioral problems, and urogenital disorders at birth in male infants such as like hypospadias, so is exposure to multiple environmental chemicals and pollutants, as well as climate change. “It would be a real mistake with real life implications if we associated any congenital disease or disorder with a commonly used medication with known benefits if the true causal link lies elsewhere.”

She said the precautionary statements fall into the time-honored therapeutic principle of first do no harm. “However, the call for research action must be undertaken earnestly and sincerely.”

According to Dr. Bauer, the statement’s essential take-home message is that “physicians should educate themselves and educate women about what we’re learning about the risks of acetaminophen in pregnancy.” Risk can be minimized by using the lowest effective dose for the shortest time and only when medically indicated. “Pregnant women should speak to their physicians about acetaminophen. It’s about empowerment and making smart decisions,” she said.

This study received no specific funding. Coauthor Dr. R.T. Mitchell is supported by a UK Research Institute fellowship.

CASE

A 55-year-old right-hand-dominant woman presented to the clinic with a chief complaint of right ring finger pain and stiffness. There was no history of trauma or prior surgery. She had no tingling or numbness. She had a history of type 2 diabetes that was well controlled. She worked as a clerk for a government office for many years, and her painful, limited finger motion interfered with keyboarding and picking up items. Physical examination revealed tenderness to palpation over the palmar aspect of the metacarpophalangeal joint (MCPJ) of the ring finger with no other joint tenderness or swelling. When she made a fist, her ring finger MCPJ, proximal interphalangeal joint (PIPJ), and distal interphalangeal joint (DIPJ) locked in a flexed position that required manipulation to extend the finger. A firm mass was palpated in the palm with finger flexion that moved into the finger with extension.

Stenosing tenosynovitis, also known as trigger finger (TF), is an inflammatory condition that causes pain in the distal palm and proximal digit with associated limited motion. The most commonly affected digits are the middle and ring fingers of the dominant hand.¹ The disorder is particularly noticeable when it inhibits day-to-day functioning.

TF affects 2% to 3% of the general population and up to 20% of patients with diabetes.^2,3 Patient age and duration of diabetes are commonly cited as contributing factors, although the effect of well-controlled blood glucose and A1C on the frequency and cure rate of TF has not been established.^3,4 TF is most commonly seen in individuals ages 40 to 60 years, with a 6 times’ greater frequency in females than males.⁵

In the United States, there are an estimated 200,000 cases of TF each year, with initial presentation typically being to a primary care physician.⁶ For this reason, it is essential for primary care physicians to recognize this common pathology and treat symptoms early to prevent progression and the need for surgical intervention.

An impaired gliding motion of the flexor tendons

In each finger, a tendon sheath, consisting of 5 annular pulleys and 3 cruciate pulleys, forms a tunnel around the flexor digitorum profundus (FDP) and flexor digitorum superficialis (FDS). The tendon sheath allows for maximum force by eliminating bowstringing of the tendons when the digit is flexed. Deep to the tendons and surrounding the tendons is a synovial membrane that provides nutrition and reduces friction between the tendons and the tendon sheath.⁷

Trigger finger affects 2% to 3% of the general population and up to 20% of patients with diabetes.

The FDP is longer and assists in flexion of the MCPJ and the PIPJ. It is the sole flexor of the DIPJ. The shorter FDS assists in flexion of the MCPJ and is the primary flexor of the PIPJ. The bifurcation of the shorter FDS tendon allows the longer FDP tendon to pass through to continue to its insertion on the distal phalanx.

In the thumb, the flexor pollicis longus (FPL) is the only flexor within its tendon sheath. The FPL assists in flexion of the MCPJ and flexes the thumb interphalangeal joint (IPJ). The intrinsic muscles (lumbricals and interossei) do not extend into the tendon sheath and do not contribute to TF.

Continue to: TF occurs when

TF occurs when the tendon sheath, most commonly at the first annular pulley (A1), or the flexor tendons thicken due to fibrocartilaginous metaplasia. This results in impaired gliding motion of the flexor tendons.⁸ The stenosed A1 pulley can lead to pinching of the flexor tendons and cause the formation of a nodule on the FDS tendon at its bifurcation.⁹ The nodule of the FDS bifurcation moves proximal to the A1 pulley when the finger is flexed. Upon extension, the tendon nodule may get caught on the A1 pulley. This prevents smooth extension and is the source of pain and triggering (FIGURE 1). In a similar manner, thumb triggering is the result of a stenosed A1 pulley creating a nodule on the FPL tendon, which prevents smooth gliding of the FPL.

What you’ll see

TF is characterized by locking, popping, or clicking at the base of the finger or thumb.^7,10 A small nodule may be palpated on the palmar aspect of the MCPJ when the finger is flexed. This nodule will then move distally when the finger is extended. Patients will present with the affected digit in a flexed position and will have difficulty extending the digit. In some cases, the patient may have to use the other hand to straighten the affected digit. In more severe cases, the digit may be fixed in a position of flexion or extension. The severity of triggering is commonly graded by the Green’s classification system (see TABLE¹¹).

Is it Dupuytren contracture, trigger finger, or something else?

The differential diagnosis for TF includes Dupuytren contracture, MCPJ sprain, calcific peritendinitis, flexor tenosynovitis, diabetic cheiroarthropathy (DCA), rheumatoid arthritis (RA), osteoarthritis (OA), and crystalline arthropathy (gout).⁵

Dupuytren contracture is usually nonpainful and manifests with a palpable cord in the palm and a fixed flexion contracture that has progressed over time, with no history of catching.

MCPJ sprain is diagnosed with tenderness of the MCPJ and a history of trauma.

Continue to: Calcific peritendinitis

Calcific peritendinitis is characterized by pain, tenderness, and edema near a joint with calcified deposits seen on radiographs.

Flexor tenosynovitis manifests with fusiform swelling of the digit, tenderness over the flexor tendon sheath, and pain with passive extension of the digit; it is more commonly associated with RA.

DCA, RA, OA, and gout usually affect more than 1 digit. DCA is associated with both type 1 and type 2 diabetes and is characterized by thickened, waxy skin and painless, limited extension of the digits. RA and OA are diagnosed by medical history, lab work, and radiographs. Gout is diagnosed with lab work and aspiration of joint fluid.

Trigger finger occurs when the tendon sheath or the flexor tendons thicken due to fibrocartilaginous metaplasia.

A thorough history, physical exam, and review of radiographs must be performed to rule out these other disorders. Once the diagnosis of TF is made, available treatment options should be pursued.

Treatment: A conservative or surgical approach?

Current treatment options include both nonsurgical (conservative) and surgical interventions. Nonsurgical interventions include activity modification, splinting, and corticosteroid injections. While nonsteroidal anti-inflammatory drugs are commonly recommended to resolve the local inflammation secondary to triggering, there is no scientific evidence to support their use at this time.⁷ Surgical interventions, utilized in more severe cases or after conservative treatment has failed, include percutaneous and open release of the tendon sheath.^2,7

Continue to: Conservative treatments

Splinting is only an option for digits that retain flexibility (Green’s classification grades I, II, and III). The goal of splinting is to keep the affected digit in extension to avoid repeated friction between the tendon and the tendon sheath.¹² This ideally allows any cartilaginous metaplasia or inflammation to resolve, subsequently alleviating symptoms. The recommended length of treatment with splinting ranges from 3 to 12 weeks, with an average of 6 weeks.¹

Multiple studies have shown long-term alleviation of symptoms with the use of orthotic devices. A retrospective analysis found that 87% of patients who wore their PIPJ orthotic device both day and night for a minimum of 6 weeks required no further treatment at 1-year follow-up.¹³ In contrast, MCPJ splinting only at night has been shown to resolve symptoms in just 55% of patients after 6 weeks.¹⁴ From a practical standpoint, however, patients are more likely to be compliant with night-only splinting, making it a reasonable option. Splinting does remain efficacious for patients even after 6 months of symptomatology.¹⁵

Day and night splinting for approximately 8 weeks using a PIPJ orthotic could be considered as an effective first-line intervention.¹⁶ Notably, PIPJ splinting is more functional, as it allows motion of the MCPJ and DIPJ. There are several options available for PIPJ splints, including a stiff cushioned sleeve, a prefabricated plastic splint, and a large adhesive bandage.

An adjunct treatment to splinting is tendon-gliding exercises, including passive IPJ flexion, full finger flexion and extension, and hooking.¹³ Patients may remove the orthotic device to perform these exercises 3 times a day for 5 repetitions, as well as for activities that are not conducive to splinting.¹³

Corticosteroid injections. Injections of a corticosteroid and 1% lidocaine in a 1:1 mixture for a total volume of 1 cc can be inserted into the tendon sheath, A1 pulley, or adjacent tissue.¹⁷ Steroid injections help to decrease inflammation and pain in the affected area, giving symptom relief lasting a few months in as many as 57% to 87% of patients.¹⁸

Continue to: While the location of the injection...

While the location of the injection has been debated, recent literature suggests that symptoms can be effectively alleviated regardless of the specific anatomic injection site, such as intra-sheath or extra-sheath (FIGURE 2).¹⁹ This allows flexibility for the clinician, as the injection does not have to be placed within the tendon sheath. Corticosteroids should not be injected into the tendon itself, and the needle tip should be slightly withdrawn if there is resistance while injecting. Patients who are averse to injections have been shown to benefit from needle-free jet lidocaine (J-tip) administration prior to the actual steroid injection.²⁰

A randomized controlled trial comparing dexamethasone to triamcinolone injections found no difference in outcome at the 3-month follow-up (n = 84).¹⁷ This may suggest that the choice of corticosteroid is at the clinician’s discretion. In terms of long-term efficacy of steroid injections, it has been shown that 70% of trigger digits had complete resolution of symptoms at a mean follow-up of 8 years after just 1 injection (n = 43).²¹

Some patients, though, may require additional corticosteroid injections to maintain symptom control. If multiple injections are performed, they should not be given in intervals shorter than 4 months between treatments.⁵ Furthermore, steroids can be administered safely up to 3 times in the same digit before surgery is recommended.²²

A patient’s options should be reconsidered if efficacy is not demonstrated with prior injections. Notably, a lower success rate has been shown in patients with type 2 diabetes (66%) compared to those without diabetes (90%).^4,23 This difference in success rates is not well understood, as there is no causal relationship between well-controlled diabetes and TF.⁴ Complications of corticosteroid injections include local pain, fat atrophy, and hypopigmentation at the site of the injection, as well as short-term elevations in blood glucose levels in patients with diabetes.^5,24

Surgical correction (to be discussed) remains superior to steroid injections in terms of cure rate and resolution of symptoms. A randomized controlled trial (n = 165) found that an injection-only group reported 86% and 49% success at 3-month and 12-month follow-up, respectively, compared to 99% success at both 3- and 12-month follow-up for the surgical group. Further, at 12-month follow-up, the median pain scores were significantly higher in the injection group (3; range, 1-9) than in the surgery group (1; range, 1-7).²⁵ If conservative treatment modalities lead to unresolved symptoms or recurrence, referral to a hand specialist for surgery is recommended.

Continue to: Surgical treatments in an office setting

Surgical treatments in an office setting

Procedures for TF can be safely performed under conscious sedation or local anesthesia, with or without a tourniquet.²⁶ Wide-awake procedures with local anesthesia and no tourniquet (WALANT) can be performed in an office-based procedure room rather than the operating room. This increases efficiency for the surgeon, reduces the amount of preparation and recovery time for the patient, and helps to keep costs down.

Percutaneous release involves the insertion of a 16-gauge hypodermic needle into the affected A1 pulley. The needle is used to fray and disrupt the pulley by moving the needle tip over the fibrotic A1 pulley.

While NSAIDs are commonly recommended to resolve the local inflammation secondary to triggering, there is no scientific evidence to support their use.

However, it is not without possible complications.²⁷ Inadvertent A2 pulley damage is particularly troublesome, as it leads to “bowstringing” or protrusion of the flexor tendon into the palm upon flexion. This can cause pain and failure to fully extend or flex the finger.¹⁰ Because the anatomy is not well visualized during the percutaneous approach, incomplete release, neurovascular injury, and iatrogenic injury to the A2 pulley or deep tendon may occur.²⁸ Ultrasound-guided percutaneous release techniques have shown effective clinical outcomes with minimal complications compared to nonguided percutaneous release techniques.^29,30

Open release is the gold standard surgical treatment for trigger finger (FIGURE 3). A small incision (1-2 cm) is made directly over or proximal to the A1 pulley in the distal palmar crease at the base of the affected digit. After blunt dissection through the subcutaneous tissue, the A1 pulley is sharply incised. An open approach has the clear benefit of avoiding the digital neurovascular bundles, as well as visualizing the resolution of triggering upon flexion and extension prior to closure. The WALANT procedure has the advantage of allowing the awake patient to actively flex and extend the digit to determine if the A1 release has been successful prior to closure of the incision.

Outcomes and complications of surgery. A recent systematic review and meta-analysis has shown percutaneous techniques to be successful in 94% of cases.²⁷ The success rate of open surgery has been reported at 99% to 100% at varying follow-up intervals up to 1 year.^25,30,31 The complication rate for percutaneous release (guided and nonguided) was calculated at 2.2% (n = 2114).²⁷ In another study, the overall complication rate of open releases was calculated at 1% (n = 999).³² When comparing percutaneous release (guided and nonguided) and open release, a meta-analysis found no significant difference in complication rate (RR = 0.84) or failure rate (RR = 0.94).³²

Continue to: Several risk factors...

Several risk factors have been associated with postoperative surgical infection, including recent steroid injection (< 80 d), smoking status, increasing age, and pre-operative use of lidocaine with epinephrine.³³ Open release has been shown to be an effective and safe treatment modality for patients with and without diabetes alike.³⁴ Overall, definitive surgical correction has been demonstrated to be superior to conservative measures due to a significantly lower rate of recurrence.³⁵

CASE

Given the patient’s presentation with triggering of the digit, tenderness over the A1 pulley, and lack of trauma history, we diagnosed trigger finger in this patient. Potential treatments included splinting, corticosteroid injections, and surgery. After discussion of the risks and benefits of each treatment option, the patient elected to undergo a corticosteroid injection. She was also given a neoprene finger sleeve to wear every night, and in the daytime when possible.

At 12-week follow-up, she noted early improvement in her triggering, which had since recurred. Due to her history of diabetes, the patient was then referred for surgery. She had an open release under local anesthesia. The surgery was uncomplicated, and the abnormality was corrected. At the patient’s 1-year postoperative follow-up visit, there was no evidence of recurrence, and she had regained full active and passive range of motion of her finger.

Acknowledgements
The authors wish to thank Jose Borrero, MD, for contributing his time and creative talents to produce the illustrations in this article.

CORRESPONDENCE
Evan P. Johnson, MD; 506 South Greer Street, Memphis, TN 38111; [email protected]

CASE

A 55-year-old right-hand-dominant woman presented to the clinic with a chief complaint of right ring finger pain and stiffness. There was no history of trauma or prior surgery. She had no tingling or numbness. She had a history of type 2 diabetes that was well controlled. She worked as a clerk for a government office for many years, and her painful, limited finger motion interfered with keyboarding and picking up items. Physical examination revealed tenderness to palpation over the palmar aspect of the metacarpophalangeal joint (MCPJ) of the ring finger with no other joint tenderness or swelling. When she made a fist, her ring finger MCPJ, proximal interphalangeal joint (PIPJ), and distal interphalangeal joint (DIPJ) locked in a flexed position that required manipulation to extend the finger. A firm mass was palpated in the palm with finger flexion that moved into the finger with extension.

Stenosing tenosynovitis, also known as trigger finger (TF), is an inflammatory condition that causes pain in the distal palm and proximal digit with associated limited motion. The most commonly affected digits are the middle and ring fingers of the dominant hand.¹ The disorder is particularly noticeable when it inhibits day-to-day functioning.

TF affects 2% to 3% of the general population and up to 20% of patients with diabetes.^2,3 Patient age and duration of diabetes are commonly cited as contributing factors, although the effect of well-controlled blood glucose and A1C on the frequency and cure rate of TF has not been established.^3,4 TF is most commonly seen in individuals ages 40 to 60 years, with a 6 times’ greater frequency in females than males.⁵

In the United States, there are an estimated 200,000 cases of TF each year, with initial presentation typically being to a primary care physician.⁶ For this reason, it is essential for primary care physicians to recognize this common pathology and treat symptoms early to prevent progression and the need for surgical intervention.

An impaired gliding motion of the flexor tendons

In each finger, a tendon sheath, consisting of 5 annular pulleys and 3 cruciate pulleys, forms a tunnel around the flexor digitorum profundus (FDP) and flexor digitorum superficialis (FDS). The tendon sheath allows for maximum force by eliminating bowstringing of the tendons when the digit is flexed. Deep to the tendons and surrounding the tendons is a synovial membrane that provides nutrition and reduces friction between the tendons and the tendon sheath.⁷

Trigger finger affects 2% to 3% of the general population and up to 20% of patients with diabetes.

The FDP is longer and assists in flexion of the MCPJ and the PIPJ. It is the sole flexor of the DIPJ. The shorter FDS assists in flexion of the MCPJ and is the primary flexor of the PIPJ. The bifurcation of the shorter FDS tendon allows the longer FDP tendon to pass through to continue to its insertion on the distal phalanx.

In the thumb, the flexor pollicis longus (FPL) is the only flexor within its tendon sheath. The FPL assists in flexion of the MCPJ and flexes the thumb interphalangeal joint (IPJ). The intrinsic muscles (lumbricals and interossei) do not extend into the tendon sheath and do not contribute to TF.

Continue to: TF occurs when

TF occurs when the tendon sheath, most commonly at the first annular pulley (A1), or the flexor tendons thicken due to fibrocartilaginous metaplasia. This results in impaired gliding motion of the flexor tendons.⁸ The stenosed A1 pulley can lead to pinching of the flexor tendons and cause the formation of a nodule on the FDS tendon at its bifurcation.⁹ The nodule of the FDS bifurcation moves proximal to the A1 pulley when the finger is flexed. Upon extension, the tendon nodule may get caught on the A1 pulley. This prevents smooth extension and is the source of pain and triggering (FIGURE 1). In a similar manner, thumb triggering is the result of a stenosed A1 pulley creating a nodule on the FPL tendon, which prevents smooth gliding of the FPL.

What you’ll see

TF is characterized by locking, popping, or clicking at the base of the finger or thumb.^7,10 A small nodule may be palpated on the palmar aspect of the MCPJ when the finger is flexed. This nodule will then move distally when the finger is extended. Patients will present with the affected digit in a flexed position and will have difficulty extending the digit. In some cases, the patient may have to use the other hand to straighten the affected digit. In more severe cases, the digit may be fixed in a position of flexion or extension. The severity of triggering is commonly graded by the Green’s classification system (see TABLE¹¹).

Is it Dupuytren contracture, trigger finger, or something else?

The differential diagnosis for TF includes Dupuytren contracture, MCPJ sprain, calcific peritendinitis, flexor tenosynovitis, diabetic cheiroarthropathy (DCA), rheumatoid arthritis (RA), osteoarthritis (OA), and crystalline arthropathy (gout).⁵

Dupuytren contracture is usually nonpainful and manifests with a palpable cord in the palm and a fixed flexion contracture that has progressed over time, with no history of catching.

MCPJ sprain is diagnosed with tenderness of the MCPJ and a history of trauma.

Continue to: Calcific peritendinitis

Calcific peritendinitis is characterized by pain, tenderness, and edema near a joint with calcified deposits seen on radiographs.

Flexor tenosynovitis manifests with fusiform swelling of the digit, tenderness over the flexor tendon sheath, and pain with passive extension of the digit; it is more commonly associated with RA.

DCA, RA, OA, and gout usually affect more than 1 digit. DCA is associated with both type 1 and type 2 diabetes and is characterized by thickened, waxy skin and painless, limited extension of the digits. RA and OA are diagnosed by medical history, lab work, and radiographs. Gout is diagnosed with lab work and aspiration of joint fluid.

Trigger finger occurs when the tendon sheath or the flexor tendons thicken due to fibrocartilaginous metaplasia.

A thorough history, physical exam, and review of radiographs must be performed to rule out these other disorders. Once the diagnosis of TF is made, available treatment options should be pursued.

Treatment: A conservative or surgical approach?

Current treatment options include both nonsurgical (conservative) and surgical interventions. Nonsurgical interventions include activity modification, splinting, and corticosteroid injections. While nonsteroidal anti-inflammatory drugs are commonly recommended to resolve the local inflammation secondary to triggering, there is no scientific evidence to support their use at this time.⁷ Surgical interventions, utilized in more severe cases or after conservative treatment has failed, include percutaneous and open release of the tendon sheath.^2,7

Continue to: Conservative treatments

Splinting is only an option for digits that retain flexibility (Green’s classification grades I, II, and III). The goal of splinting is to keep the affected digit in extension to avoid repeated friction between the tendon and the tendon sheath.¹² This ideally allows any cartilaginous metaplasia or inflammation to resolve, subsequently alleviating symptoms. The recommended length of treatment with splinting ranges from 3 to 12 weeks, with an average of 6 weeks.¹

Multiple studies have shown long-term alleviation of symptoms with the use of orthotic devices. A retrospective analysis found that 87% of patients who wore their PIPJ orthotic device both day and night for a minimum of 6 weeks required no further treatment at 1-year follow-up.¹³ In contrast, MCPJ splinting only at night has been shown to resolve symptoms in just 55% of patients after 6 weeks.¹⁴ From a practical standpoint, however, patients are more likely to be compliant with night-only splinting, making it a reasonable option. Splinting does remain efficacious for patients even after 6 months of symptomatology.¹⁵

Day and night splinting for approximately 8 weeks using a PIPJ orthotic could be considered as an effective first-line intervention.¹⁶ Notably, PIPJ splinting is more functional, as it allows motion of the MCPJ and DIPJ. There are several options available for PIPJ splints, including a stiff cushioned sleeve, a prefabricated plastic splint, and a large adhesive bandage.

An adjunct treatment to splinting is tendon-gliding exercises, including passive IPJ flexion, full finger flexion and extension, and hooking.¹³ Patients may remove the orthotic device to perform these exercises 3 times a day for 5 repetitions, as well as for activities that are not conducive to splinting.¹³

Corticosteroid injections. Injections of a corticosteroid and 1% lidocaine in a 1:1 mixture for a total volume of 1 cc can be inserted into the tendon sheath, A1 pulley, or adjacent tissue.¹⁷ Steroid injections help to decrease inflammation and pain in the affected area, giving symptom relief lasting a few months in as many as 57% to 87% of patients.¹⁸

Continue to: While the location of the injection...

While the location of the injection has been debated, recent literature suggests that symptoms can be effectively alleviated regardless of the specific anatomic injection site, such as intra-sheath or extra-sheath (FIGURE 2).¹⁹ This allows flexibility for the clinician, as the injection does not have to be placed within the tendon sheath. Corticosteroids should not be injected into the tendon itself, and the needle tip should be slightly withdrawn if there is resistance while injecting. Patients who are averse to injections have been shown to benefit from needle-free jet lidocaine (J-tip) administration prior to the actual steroid injection.²⁰

A randomized controlled trial comparing dexamethasone to triamcinolone injections found no difference in outcome at the 3-month follow-up (n = 84).¹⁷ This may suggest that the choice of corticosteroid is at the clinician’s discretion. In terms of long-term efficacy of steroid injections, it has been shown that 70% of trigger digits had complete resolution of symptoms at a mean follow-up of 8 years after just 1 injection (n = 43).²¹

Some patients, though, may require additional corticosteroid injections to maintain symptom control. If multiple injections are performed, they should not be given in intervals shorter than 4 months between treatments.⁵ Furthermore, steroids can be administered safely up to 3 times in the same digit before surgery is recommended.²²

A patient’s options should be reconsidered if efficacy is not demonstrated with prior injections. Notably, a lower success rate has been shown in patients with type 2 diabetes (66%) compared to those without diabetes (90%).^4,23 This difference in success rates is not well understood, as there is no causal relationship between well-controlled diabetes and TF.⁴ Complications of corticosteroid injections include local pain, fat atrophy, and hypopigmentation at the site of the injection, as well as short-term elevations in blood glucose levels in patients with diabetes.^5,24

Surgical correction (to be discussed) remains superior to steroid injections in terms of cure rate and resolution of symptoms. A randomized controlled trial (n = 165) found that an injection-only group reported 86% and 49% success at 3-month and 12-month follow-up, respectively, compared to 99% success at both 3- and 12-month follow-up for the surgical group. Further, at 12-month follow-up, the median pain scores were significantly higher in the injection group (3; range, 1-9) than in the surgery group (1; range, 1-7).²⁵ If conservative treatment modalities lead to unresolved symptoms or recurrence, referral to a hand specialist for surgery is recommended.

Continue to: Surgical treatments in an office setting

Surgical treatments in an office setting

Procedures for TF can be safely performed under conscious sedation or local anesthesia, with or without a tourniquet.²⁶ Wide-awake procedures with local anesthesia and no tourniquet (WALANT) can be performed in an office-based procedure room rather than the operating room. This increases efficiency for the surgeon, reduces the amount of preparation and recovery time for the patient, and helps to keep costs down.

Percutaneous release involves the insertion of a 16-gauge hypodermic needle into the affected A1 pulley. The needle is used to fray and disrupt the pulley by moving the needle tip over the fibrotic A1 pulley.

While NSAIDs are commonly recommended to resolve the local inflammation secondary to triggering, there is no scientific evidence to support their use.

However, it is not without possible complications.²⁷ Inadvertent A2 pulley damage is particularly troublesome, as it leads to “bowstringing” or protrusion of the flexor tendon into the palm upon flexion. This can cause pain and failure to fully extend or flex the finger.¹⁰ Because the anatomy is not well visualized during the percutaneous approach, incomplete release, neurovascular injury, and iatrogenic injury to the A2 pulley or deep tendon may occur.²⁸ Ultrasound-guided percutaneous release techniques have shown effective clinical outcomes with minimal complications compared to nonguided percutaneous release techniques.^29,30

Open release is the gold standard surgical treatment for trigger finger (FIGURE 3). A small incision (1-2 cm) is made directly over or proximal to the A1 pulley in the distal palmar crease at the base of the affected digit. After blunt dissection through the subcutaneous tissue, the A1 pulley is sharply incised. An open approach has the clear benefit of avoiding the digital neurovascular bundles, as well as visualizing the resolution of triggering upon flexion and extension prior to closure. The WALANT procedure has the advantage of allowing the awake patient to actively flex and extend the digit to determine if the A1 release has been successful prior to closure of the incision.

Outcomes and complications of surgery. A recent systematic review and meta-analysis has shown percutaneous techniques to be successful in 94% of cases.²⁷ The success rate of open surgery has been reported at 99% to 100% at varying follow-up intervals up to 1 year.^25,30,31 The complication rate for percutaneous release (guided and nonguided) was calculated at 2.2% (n = 2114).²⁷ In another study, the overall complication rate of open releases was calculated at 1% (n = 999).³² When comparing percutaneous release (guided and nonguided) and open release, a meta-analysis found no significant difference in complication rate (RR = 0.84) or failure rate (RR = 0.94).³²

Continue to: Several risk factors...

Several risk factors have been associated with postoperative surgical infection, including recent steroid injection (< 80 d), smoking status, increasing age, and pre-operative use of lidocaine with epinephrine.³³ Open release has been shown to be an effective and safe treatment modality for patients with and without diabetes alike.³⁴ Overall, definitive surgical correction has been demonstrated to be superior to conservative measures due to a significantly lower rate of recurrence.³⁵

CASE

Given the patient’s presentation with triggering of the digit, tenderness over the A1 pulley, and lack of trauma history, we diagnosed trigger finger in this patient. Potential treatments included splinting, corticosteroid injections, and surgery. After discussion of the risks and benefits of each treatment option, the patient elected to undergo a corticosteroid injection. She was also given a neoprene finger sleeve to wear every night, and in the daytime when possible.

At 12-week follow-up, she noted early improvement in her triggering, which had since recurred. Due to her history of diabetes, the patient was then referred for surgery. She had an open release under local anesthesia. The surgery was uncomplicated, and the abnormality was corrected. At the patient’s 1-year postoperative follow-up visit, there was no evidence of recurrence, and she had regained full active and passive range of motion of her finger.

Acknowledgements
The authors wish to thank Jose Borrero, MD, for contributing his time and creative talents to produce the illustrations in this article.

CORRESPONDENCE
Evan P. Johnson, MD; 506 South Greer Street, Memphis, TN 38111; [email protected]

CASE

A 55-year-old right-hand-dominant woman presented to the clinic with a chief complaint of right ring finger pain and stiffness. There was no history of trauma or prior surgery. She had no tingling or numbness. She had a history of type 2 diabetes that was well controlled. She worked as a clerk for a government office for many years, and her painful, limited finger motion interfered with keyboarding and picking up items. Physical examination revealed tenderness to palpation over the palmar aspect of the metacarpophalangeal joint (MCPJ) of the ring finger with no other joint tenderness or swelling. When she made a fist, her ring finger MCPJ, proximal interphalangeal joint (PIPJ), and distal interphalangeal joint (DIPJ) locked in a flexed position that required manipulation to extend the finger. A firm mass was palpated in the palm with finger flexion that moved into the finger with extension.

Stenosing tenosynovitis, also known as trigger finger (TF), is an inflammatory condition that causes pain in the distal palm and proximal digit with associated limited motion. The most commonly affected digits are the middle and ring fingers of the dominant hand.¹ The disorder is particularly noticeable when it inhibits day-to-day functioning.

TF affects 2% to 3% of the general population and up to 20% of patients with diabetes.^2,3 Patient age and duration of diabetes are commonly cited as contributing factors, although the effect of well-controlled blood glucose and A1C on the frequency and cure rate of TF has not been established.^3,4 TF is most commonly seen in individuals ages 40 to 60 years, with a 6 times’ greater frequency in females than males.⁵

In the United States, there are an estimated 200,000 cases of TF each year, with initial presentation typically being to a primary care physician.⁶ For this reason, it is essential for primary care physicians to recognize this common pathology and treat symptoms early to prevent progression and the need for surgical intervention.

An impaired gliding motion of the flexor tendons

In each finger, a tendon sheath, consisting of 5 annular pulleys and 3 cruciate pulleys, forms a tunnel around the flexor digitorum profundus (FDP) and flexor digitorum superficialis (FDS). The tendon sheath allows for maximum force by eliminating bowstringing of the tendons when the digit is flexed. Deep to the tendons and surrounding the tendons is a synovial membrane that provides nutrition and reduces friction between the tendons and the tendon sheath.⁷

Trigger finger affects 2% to 3% of the general population and up to 20% of patients with diabetes.

The FDP is longer and assists in flexion of the MCPJ and the PIPJ. It is the sole flexor of the DIPJ. The shorter FDS assists in flexion of the MCPJ and is the primary flexor of the PIPJ. The bifurcation of the shorter FDS tendon allows the longer FDP tendon to pass through to continue to its insertion on the distal phalanx.

In the thumb, the flexor pollicis longus (FPL) is the only flexor within its tendon sheath. The FPL assists in flexion of the MCPJ and flexes the thumb interphalangeal joint (IPJ). The intrinsic muscles (lumbricals and interossei) do not extend into the tendon sheath and do not contribute to TF.

Continue to: TF occurs when

TF occurs when the tendon sheath, most commonly at the first annular pulley (A1), or the flexor tendons thicken due to fibrocartilaginous metaplasia. This results in impaired gliding motion of the flexor tendons.⁸ The stenosed A1 pulley can lead to pinching of the flexor tendons and cause the formation of a nodule on the FDS tendon at its bifurcation.⁹ The nodule of the FDS bifurcation moves proximal to the A1 pulley when the finger is flexed. Upon extension, the tendon nodule may get caught on the A1 pulley. This prevents smooth extension and is the source of pain and triggering (FIGURE 1). In a similar manner, thumb triggering is the result of a stenosed A1 pulley creating a nodule on the FPL tendon, which prevents smooth gliding of the FPL.

What you’ll see

TF is characterized by locking, popping, or clicking at the base of the finger or thumb.^7,10 A small nodule may be palpated on the palmar aspect of the MCPJ when the finger is flexed. This nodule will then move distally when the finger is extended. Patients will present with the affected digit in a flexed position and will have difficulty extending the digit. In some cases, the patient may have to use the other hand to straighten the affected digit. In more severe cases, the digit may be fixed in a position of flexion or extension. The severity of triggering is commonly graded by the Green’s classification system (see TABLE¹¹).

Is it Dupuytren contracture, trigger finger, or something else?

The differential diagnosis for TF includes Dupuytren contracture, MCPJ sprain, calcific peritendinitis, flexor tenosynovitis, diabetic cheiroarthropathy (DCA), rheumatoid arthritis (RA), osteoarthritis (OA), and crystalline arthropathy (gout).⁵

Dupuytren contracture is usually nonpainful and manifests with a palpable cord in the palm and a fixed flexion contracture that has progressed over time, with no history of catching.

MCPJ sprain is diagnosed with tenderness of the MCPJ and a history of trauma.

Continue to: Calcific peritendinitis

Calcific peritendinitis is characterized by pain, tenderness, and edema near a joint with calcified deposits seen on radiographs.

Flexor tenosynovitis manifests with fusiform swelling of the digit, tenderness over the flexor tendon sheath, and pain with passive extension of the digit; it is more commonly associated with RA.

DCA, RA, OA, and gout usually affect more than 1 digit. DCA is associated with both type 1 and type 2 diabetes and is characterized by thickened, waxy skin and painless, limited extension of the digits. RA and OA are diagnosed by medical history, lab work, and radiographs. Gout is diagnosed with lab work and aspiration of joint fluid.

Trigger finger occurs when the tendon sheath or the flexor tendons thicken due to fibrocartilaginous metaplasia.

A thorough history, physical exam, and review of radiographs must be performed to rule out these other disorders. Once the diagnosis of TF is made, available treatment options should be pursued.

Treatment: A conservative or surgical approach?

Current treatment options include both nonsurgical (conservative) and surgical interventions. Nonsurgical interventions include activity modification, splinting, and corticosteroid injections. While nonsteroidal anti-inflammatory drugs are commonly recommended to resolve the local inflammation secondary to triggering, there is no scientific evidence to support their use at this time.⁷ Surgical interventions, utilized in more severe cases or after conservative treatment has failed, include percutaneous and open release of the tendon sheath.^2,7

Continue to: Conservative treatments

Splinting is only an option for digits that retain flexibility (Green’s classification grades I, II, and III). The goal of splinting is to keep the affected digit in extension to avoid repeated friction between the tendon and the tendon sheath.¹² This ideally allows any cartilaginous metaplasia or inflammation to resolve, subsequently alleviating symptoms. The recommended length of treatment with splinting ranges from 3 to 12 weeks, with an average of 6 weeks.¹

Multiple studies have shown long-term alleviation of symptoms with the use of orthotic devices. A retrospective analysis found that 87% of patients who wore their PIPJ orthotic device both day and night for a minimum of 6 weeks required no further treatment at 1-year follow-up.¹³ In contrast, MCPJ splinting only at night has been shown to resolve symptoms in just 55% of patients after 6 weeks.¹⁴ From a practical standpoint, however, patients are more likely to be compliant with night-only splinting, making it a reasonable option. Splinting does remain efficacious for patients even after 6 months of symptomatology.¹⁵

Day and night splinting for approximately 8 weeks using a PIPJ orthotic could be considered as an effective first-line intervention.¹⁶ Notably, PIPJ splinting is more functional, as it allows motion of the MCPJ and DIPJ. There are several options available for PIPJ splints, including a stiff cushioned sleeve, a prefabricated plastic splint, and a large adhesive bandage.

An adjunct treatment to splinting is tendon-gliding exercises, including passive IPJ flexion, full finger flexion and extension, and hooking.¹³ Patients may remove the orthotic device to perform these exercises 3 times a day for 5 repetitions, as well as for activities that are not conducive to splinting.¹³

Corticosteroid injections. Injections of a corticosteroid and 1% lidocaine in a 1:1 mixture for a total volume of 1 cc can be inserted into the tendon sheath, A1 pulley, or adjacent tissue.¹⁷ Steroid injections help to decrease inflammation and pain in the affected area, giving symptom relief lasting a few months in as many as 57% to 87% of patients.¹⁸

Continue to: While the location of the injection...

While the location of the injection has been debated, recent literature suggests that symptoms can be effectively alleviated regardless of the specific anatomic injection site, such as intra-sheath or extra-sheath (FIGURE 2).¹⁹ This allows flexibility for the clinician, as the injection does not have to be placed within the tendon sheath. Corticosteroids should not be injected into the tendon itself, and the needle tip should be slightly withdrawn if there is resistance while injecting. Patients who are averse to injections have been shown to benefit from needle-free jet lidocaine (J-tip) administration prior to the actual steroid injection.²⁰

A randomized controlled trial comparing dexamethasone to triamcinolone injections found no difference in outcome at the 3-month follow-up (n = 84).¹⁷ This may suggest that the choice of corticosteroid is at the clinician’s discretion. In terms of long-term efficacy of steroid injections, it has been shown that 70% of trigger digits had complete resolution of symptoms at a mean follow-up of 8 years after just 1 injection (n = 43).²¹

Some patients, though, may require additional corticosteroid injections to maintain symptom control. If multiple injections are performed, they should not be given in intervals shorter than 4 months between treatments.⁵ Furthermore, steroids can be administered safely up to 3 times in the same digit before surgery is recommended.²²

A patient’s options should be reconsidered if efficacy is not demonstrated with prior injections. Notably, a lower success rate has been shown in patients with type 2 diabetes (66%) compared to those without diabetes (90%).^4,23 This difference in success rates is not well understood, as there is no causal relationship between well-controlled diabetes and TF.⁴ Complications of corticosteroid injections include local pain, fat atrophy, and hypopigmentation at the site of the injection, as well as short-term elevations in blood glucose levels in patients with diabetes.^5,24

Surgical correction (to be discussed) remains superior to steroid injections in terms of cure rate and resolution of symptoms. A randomized controlled trial (n = 165) found that an injection-only group reported 86% and 49% success at 3-month and 12-month follow-up, respectively, compared to 99% success at both 3- and 12-month follow-up for the surgical group. Further, at 12-month follow-up, the median pain scores were significantly higher in the injection group (3; range, 1-9) than in the surgery group (1; range, 1-7).²⁵ If conservative treatment modalities lead to unresolved symptoms or recurrence, referral to a hand specialist for surgery is recommended.

Continue to: Surgical treatments in an office setting

Surgical treatments in an office setting

Procedures for TF can be safely performed under conscious sedation or local anesthesia, with or without a tourniquet.²⁶ Wide-awake procedures with local anesthesia and no tourniquet (WALANT) can be performed in an office-based procedure room rather than the operating room. This increases efficiency for the surgeon, reduces the amount of preparation and recovery time for the patient, and helps to keep costs down.

Percutaneous release involves the insertion of a 16-gauge hypodermic needle into the affected A1 pulley. The needle is used to fray and disrupt the pulley by moving the needle tip over the fibrotic A1 pulley.

While NSAIDs are commonly recommended to resolve the local inflammation secondary to triggering, there is no scientific evidence to support their use.

However, it is not without possible complications.²⁷ Inadvertent A2 pulley damage is particularly troublesome, as it leads to “bowstringing” or protrusion of the flexor tendon into the palm upon flexion. This can cause pain and failure to fully extend or flex the finger.¹⁰ Because the anatomy is not well visualized during the percutaneous approach, incomplete release, neurovascular injury, and iatrogenic injury to the A2 pulley or deep tendon may occur.²⁸ Ultrasound-guided percutaneous release techniques have shown effective clinical outcomes with minimal complications compared to nonguided percutaneous release techniques.^29,30

Open release is the gold standard surgical treatment for trigger finger (FIGURE 3). A small incision (1-2 cm) is made directly over or proximal to the A1 pulley in the distal palmar crease at the base of the affected digit. After blunt dissection through the subcutaneous tissue, the A1 pulley is sharply incised. An open approach has the clear benefit of avoiding the digital neurovascular bundles, as well as visualizing the resolution of triggering upon flexion and extension prior to closure. The WALANT procedure has the advantage of allowing the awake patient to actively flex and extend the digit to determine if the A1 release has been successful prior to closure of the incision.

Outcomes and complications of surgery. A recent systematic review and meta-analysis has shown percutaneous techniques to be successful in 94% of cases.²⁷ The success rate of open surgery has been reported at 99% to 100% at varying follow-up intervals up to 1 year.^25,30,31 The complication rate for percutaneous release (guided and nonguided) was calculated at 2.2% (n = 2114).²⁷ In another study, the overall complication rate of open releases was calculated at 1% (n = 999).³² When comparing percutaneous release (guided and nonguided) and open release, a meta-analysis found no significant difference in complication rate (RR = 0.84) or failure rate (RR = 0.94).³²

Continue to: Several risk factors...

Several risk factors have been associated with postoperative surgical infection, including recent steroid injection (< 80 d), smoking status, increasing age, and pre-operative use of lidocaine with epinephrine.³³ Open release has been shown to be an effective and safe treatment modality for patients with and without diabetes alike.³⁴ Overall, definitive surgical correction has been demonstrated to be superior to conservative measures due to a significantly lower rate of recurrence.³⁵

CASE

Given the patient’s presentation with triggering of the digit, tenderness over the A1 pulley, and lack of trauma history, we diagnosed trigger finger in this patient. Potential treatments included splinting, corticosteroid injections, and surgery. After discussion of the risks and benefits of each treatment option, the patient elected to undergo a corticosteroid injection. She was also given a neoprene finger sleeve to wear every night, and in the daytime when possible.

At 12-week follow-up, she noted early improvement in her triggering, which had since recurred. Due to her history of diabetes, the patient was then referred for surgery. She had an open release under local anesthesia. The surgery was uncomplicated, and the abnormality was corrected. At the patient’s 1-year postoperative follow-up visit, there was no evidence of recurrence, and she had regained full active and passive range of motion of her finger.

Acknowledgements
The authors wish to thank Jose Borrero, MD, for contributing his time and creative talents to produce the illustrations in this article.

CORRESPONDENCE
Evan P. Johnson, MD; 506 South Greer Street, Memphis, TN 38111; [email protected]

“Evidence alone is not sufficient for clinical decision-making, particularly in chronic pain,” said Jason Busse, DC, PhD, director of Michael G. DeGroote Centre for Medicinal Cannabis Research at McMaster University, Hamilton, Ont., and lead author of a newly released rapid guideline on medical cannabis or cannabinoids for chronic pain.

McMaster University

The recommendations, published online Sept. 9, 2021 in the British Medical Journal, suggest that providers offer patients with chronic pain a trial of noninhaled medical cannabis or cannabinoids if standard care or management is ineffective. However, the “weak” rating attached to the recommendation may compel some clinicians to automatically write off the panel’s recommendations.

“Because of the close balance between benefits and harms and wide variability in patient attitudes, the panel came to the conclusion that [some] patients presented with the current best evidence would likely choose to engage in a trial of medicinal cannabis, if their current care was felt to be suboptimal,” Dr. Busse explained in an interview.

But more importantly, “the recommendation allows for shared decision making to occur, and for different patients to make different decisions based on individual preferences and circumstances,” he said.
 

Evidence supports improved pain and sleep quality, physical functioning

Evidence supporting the use of medical cannabis in chronic pain is derived from a rigorous systematic review and meta-analysis of 32 studies enrolling 5,174 patients randomized to oral (capsule, spray, sublingual drops) or topical (transdermal cream) medical cannabis or placebo. Of note, three types of cannabinoids were represented: phytocannabinoids, synthetic, and endocannabinoids.

The studies included both patients with chronic noncancer pain (28 studies, n = 3,812) and chronic cancer pain not receiving palliative care (4 studies, n = 1,362). On average, baseline pain scores were a median 6.28 cm on a 10-cm visual analog scale (VAS), and median participant age was 53 years. 60% of trials reporting sex differences enrolled female participants. Overall, patients were followed for roughly 2 months (median, 50 days).

Findings (27 studies, n = 3,939) showed that, compared with placebo, medical cannabis resulted in a small, albeit important, improvement in the proportion of patients experiencing pain relief at or above the minimally important difference (MID) (moderate-certainty evidence, 10% modeled risk difference [RD; 95% confidence interval, 5%-15%] for achieving at least the MID of 1 cm).

Medical cannabis (15 studies, n = 2,425) also provided a small increase in the proportion of patients experiencing improvements in physical functioning at or above the MID (high certainty evidence, 4% modeled RD [95% CI, 0.1%-8%] for achieving at least a MID of 10 points).

Additionally, participants experienced significant improvements in sleep quality, compared with placebo (16 studies, 3,124 participants, high-quality evidence), demonstrating a weighted mean difference of –0.53 cm on a 10-cm VAS (95% CI, –0.75 to –0.30 cm). A total of nine larger trials (n = 2,652, high-certainty evidence) saw a small increase in the proportion of patients experiencing improved sleep quality at or above the MID: 6% modeled RD (95% CI, 2%-9%).

On the other hand, benefits did not extend to emotional, role, or social functioning (high-certainty evidence).

First do no harm: Start low, go slow

While these findings provide a rationale for medical cannabis in chronic pain, exploring options with patients can be challenging. Studies on medical cannabis consistently note that patients want information, but data also show that many providers express a lack of knowledge to provide adequate counseling.

There are also legal hurdles. Despite the authorization of medicinal cannabis across a majority of states and territories, cannabis is still a schedule I substance under the Federal Controlled Substances Act. In addition, the absence of standards around formulations, potency, and dosing has also been cited as a major barrier to recommending medical cannabis, as have concerns about adverse events (AEs), especially with inhaled and tetrahydrocannabinol (THC)-predominant formulations.

Like most medications, medical cannabis dosing should be individualized depending on product, patient, and ability to titrate the dose, but the guidelines provide a general rule of thumb. Providers considering therapeutic noninhaled medical cannabis trials are encouraged to start with a low-dose cannabidiol (CBD) oral tablet, spray, or sublingual oil drops 5 mg twice daily, increasing it by 10 mg every 2-3 days depending on the clinical response (to a maximum daily dose of 40 mg/day). If patient response is unsatisfactory, they should consider adding 1-2.5 mg THC/daily, titrated every 2-7 days to a maximum of 40 mg/day.

Still, an important caveat is whether or not adjunctive CBD alone is effective for chronic pain.

Dr. Ziva Cooper

“While we know that one out of seven U.S. adults are using cannabidiol, we know very little about its therapeutic effects when given by itself for pain,” Ziva Cooper, PhD, director of the Cannabis Research Initiative at the University of California, Los Angeles, and an associate professor at-large of psychology and behavioral science, said in an interview. (Dr. Cooper was not involved in the guideline development.)

“But patients tend to self-report that CBD is helpful, and at low doses, we know that it is unlikely to have adverse effects of any significant concern,” Dr. Cooper noted.

Depending on its components, medical cannabis is associated with a wide range of AEs. Studies comprising the evidence base for the guideline reported transient cognitive impairment (relative risk, 2.39; 95% CI, 1.06-5.38), vomiting (RR, 1.46; 95% CI, 1.07-1.99), and drowsiness (RR, 2.14; 95% CI, 1.55-2.95), attention impairment (RR, 4.04; 95% CI, 1.67-9.74), and nausea (RR, 1.59; 95% CI, 1.28-1.99). Of note, findings of a subgroup analysis showed that the risk of dizziness increased with treatment duration, starting at 3 months (test of interaction P = .002).

However, Dr. Cooper explained that, because the included studies were inconsistent in terms of cannabis type (e.g., some looked at synthetic THC or THC-like substances where others looked at a THC/CBD combination) and formulation (capsules, oral mucosal sprays), it’s difficult to tease out component-specific AEs.

“These are really important things to note, especially when you think about different populations that might be using these types of medicines moving forward,” she said.

Toward that end, the guideline specifically states that there is “no reason why the expected benefits would be systematically different among adolescents and emerging adults.”

Among children with cancer, prior study findings reinforce the conclusion that benefits are similar to adults, but studies in this area are limited to end-of-life treatment, childhood cancer with primarily palliative intent, or progressive or relapsed cancer. Because THC’s safety profile is less certain in children, it’s also important to consider adverse neurocognitive effects before initiating a medical cannabis trial in this population.
 

Navigating the landscape

Although promising, the medical cannabis landscape is undoubtedly difficult to navigate, with land mines ranging from a limited inability to simply pick up a prescribing pad to quality control.

With the exception of three Food and Drug Administration–approved products – dronabinol, cannabidiol Rx, and nabilone – U.S. providers are only able to ‘certify,’ not prescribe, medical cannabis for chronic pain, and only if it is included within the state cannabis board’s list of eligible conditions. (A state-by-state guide is available.)

Dr. Jenny Wilkerson

Quality control also varies by product but is critical. “You want to look for certificates of quality assurance,” Jenny Wilkerson, PhD, a research assistant professor of pharmacodynamics at the University of Florida, Gainesville, said in an interview. (Dr. Wilkerson was not involved in the guideline development.)

“A good dispensary should have that information or at least be willing to get that information, but generally speaking, that is something that patients need to ask for,” she emphasized, noting that “most available mass readouts are not divided by lots.”

Initial counseling and AE monitoring and regular follow-up is important, especially among patients who’ve never tried medical cannabis (or older patients whose prior experience may be limited to weaker recreational marijuana).

Notably, the reliance on medical dispensaries to deliver the right information at the right time may prove to be faulty. While recent data show that frontline dispensary workers regularly provide information to customers on their medical conditions and available products, they rarely, if ever, base recommendations on provider input, and never or rarely discuss potential AEs and other risks.

Per the new guideline, inexperienced patients should be seen monthly until a stable dose is achieved; longer times between visits can be considered in those who are more experienced. Still, patients should be advised to contact their provider when pain relief or other goals are insufficient, or when response or problematic AEs occur. This facilitates down-titration to a previously tolerated dose, up-titration in CBD and/or THC, or a different route of administration/formulation altogether.

Dr. Wilkerson pointed out that follow-up visits also provide an opportunity to do a blood draw and ask the lab to conduct pharmacokinetic analysis.

If possible, “ask patients to [ensure that they] take a standard dose before the visit so that the lab can assess the blood percentage of primary compounds and metabolites in the product that they are using,” she explained, noting that the information is helping to determine how “the different ratios may be affecting therapeutic response in individual patients.”

Granted, the guideline is only a start. But it is a good one.

“A lot of physicians want to be able to hang their hat on evidence of the safety and efficacy of these products, and the analysis that was leveraged for this guideline was very rigorous,” Dr. Cooper said.

Not only do they reinforce that “oral cannabinoids can produce small improvements in pain and provide a dosing structure that minimizes risk to the patient, [but they] should be able to help educate physicians who [are looking] for a sense of what the literature tells us at this time,” she added.

“With chronic pain, we often find that different treatments will show small potential benefits and they have a certain risk profile,” Dr. Busse said.

“It’s almost impossible to know what patients think about this option unless you present them with the evidence and ask them to make a decision based on their values and preferences,” he said.

The Michael G. DeGroote Centre for Medicinal Cannabis Research funded the MAGIC Evidence Ecosystem Foundation to support the creation of the guideline. The center receives no funding from industry Dr. Busse, Dr. Cooper, and Dr. Wilkerson reported having no relevant financial relationships.

“Evidence alone is not sufficient for clinical decision-making, particularly in chronic pain,” said Jason Busse, DC, PhD, director of Michael G. DeGroote Centre for Medicinal Cannabis Research at McMaster University, Hamilton, Ont., and lead author of a newly released rapid guideline on medical cannabis or cannabinoids for chronic pain.

McMaster University

The recommendations, published online Sept. 9, 2021 in the British Medical Journal, suggest that providers offer patients with chronic pain a trial of noninhaled medical cannabis or cannabinoids if standard care or management is ineffective. However, the “weak” rating attached to the recommendation may compel some clinicians to automatically write off the panel’s recommendations.

“Because of the close balance between benefits and harms and wide variability in patient attitudes, the panel came to the conclusion that [some] patients presented with the current best evidence would likely choose to engage in a trial of medicinal cannabis, if their current care was felt to be suboptimal,” Dr. Busse explained in an interview.

But more importantly, “the recommendation allows for shared decision making to occur, and for different patients to make different decisions based on individual preferences and circumstances,” he said.
 

Evidence supports improved pain and sleep quality, physical functioning

Evidence supporting the use of medical cannabis in chronic pain is derived from a rigorous systematic review and meta-analysis of 32 studies enrolling 5,174 patients randomized to oral (capsule, spray, sublingual drops) or topical (transdermal cream) medical cannabis or placebo. Of note, three types of cannabinoids were represented: phytocannabinoids, synthetic, and endocannabinoids.

The studies included both patients with chronic noncancer pain (28 studies, n = 3,812) and chronic cancer pain not receiving palliative care (4 studies, n = 1,362). On average, baseline pain scores were a median 6.28 cm on a 10-cm visual analog scale (VAS), and median participant age was 53 years. 60% of trials reporting sex differences enrolled female participants. Overall, patients were followed for roughly 2 months (median, 50 days).

Findings (27 studies, n = 3,939) showed that, compared with placebo, medical cannabis resulted in a small, albeit important, improvement in the proportion of patients experiencing pain relief at or above the minimally important difference (MID) (moderate-certainty evidence, 10% modeled risk difference [RD; 95% confidence interval, 5%-15%] for achieving at least the MID of 1 cm).

Medical cannabis (15 studies, n = 2,425) also provided a small increase in the proportion of patients experiencing improvements in physical functioning at or above the MID (high certainty evidence, 4% modeled RD [95% CI, 0.1%-8%] for achieving at least a MID of 10 points).

Additionally, participants experienced significant improvements in sleep quality, compared with placebo (16 studies, 3,124 participants, high-quality evidence), demonstrating a weighted mean difference of –0.53 cm on a 10-cm VAS (95% CI, –0.75 to –0.30 cm). A total of nine larger trials (n = 2,652, high-certainty evidence) saw a small increase in the proportion of patients experiencing improved sleep quality at or above the MID: 6% modeled RD (95% CI, 2%-9%).

On the other hand, benefits did not extend to emotional, role, or social functioning (high-certainty evidence).

First do no harm: Start low, go slow

While these findings provide a rationale for medical cannabis in chronic pain, exploring options with patients can be challenging. Studies on medical cannabis consistently note that patients want information, but data also show that many providers express a lack of knowledge to provide adequate counseling.

There are also legal hurdles. Despite the authorization of medicinal cannabis across a majority of states and territories, cannabis is still a schedule I substance under the Federal Controlled Substances Act. In addition, the absence of standards around formulations, potency, and dosing has also been cited as a major barrier to recommending medical cannabis, as have concerns about adverse events (AEs), especially with inhaled and tetrahydrocannabinol (THC)-predominant formulations.

Like most medications, medical cannabis dosing should be individualized depending on product, patient, and ability to titrate the dose, but the guidelines provide a general rule of thumb. Providers considering therapeutic noninhaled medical cannabis trials are encouraged to start with a low-dose cannabidiol (CBD) oral tablet, spray, or sublingual oil drops 5 mg twice daily, increasing it by 10 mg every 2-3 days depending on the clinical response (to a maximum daily dose of 40 mg/day). If patient response is unsatisfactory, they should consider adding 1-2.5 mg THC/daily, titrated every 2-7 days to a maximum of 40 mg/day.

Still, an important caveat is whether or not adjunctive CBD alone is effective for chronic pain.

Dr. Ziva Cooper

“While we know that one out of seven U.S. adults are using cannabidiol, we know very little about its therapeutic effects when given by itself for pain,” Ziva Cooper, PhD, director of the Cannabis Research Initiative at the University of California, Los Angeles, and an associate professor at-large of psychology and behavioral science, said in an interview. (Dr. Cooper was not involved in the guideline development.)

“But patients tend to self-report that CBD is helpful, and at low doses, we know that it is unlikely to have adverse effects of any significant concern,” Dr. Cooper noted.

Depending on its components, medical cannabis is associated with a wide range of AEs. Studies comprising the evidence base for the guideline reported transient cognitive impairment (relative risk, 2.39; 95% CI, 1.06-5.38), vomiting (RR, 1.46; 95% CI, 1.07-1.99), and drowsiness (RR, 2.14; 95% CI, 1.55-2.95), attention impairment (RR, 4.04; 95% CI, 1.67-9.74), and nausea (RR, 1.59; 95% CI, 1.28-1.99). Of note, findings of a subgroup analysis showed that the risk of dizziness increased with treatment duration, starting at 3 months (test of interaction P = .002).

However, Dr. Cooper explained that, because the included studies were inconsistent in terms of cannabis type (e.g., some looked at synthetic THC or THC-like substances where others looked at a THC/CBD combination) and formulation (capsules, oral mucosal sprays), it’s difficult to tease out component-specific AEs.

“These are really important things to note, especially when you think about different populations that might be using these types of medicines moving forward,” she said.

Toward that end, the guideline specifically states that there is “no reason why the expected benefits would be systematically different among adolescents and emerging adults.”

Among children with cancer, prior study findings reinforce the conclusion that benefits are similar to adults, but studies in this area are limited to end-of-life treatment, childhood cancer with primarily palliative intent, or progressive or relapsed cancer. Because THC’s safety profile is less certain in children, it’s also important to consider adverse neurocognitive effects before initiating a medical cannabis trial in this population.
 

Navigating the landscape

Although promising, the medical cannabis landscape is undoubtedly difficult to navigate, with land mines ranging from a limited inability to simply pick up a prescribing pad to quality control.

With the exception of three Food and Drug Administration–approved products – dronabinol, cannabidiol Rx, and nabilone – U.S. providers are only able to ‘certify,’ not prescribe, medical cannabis for chronic pain, and only if it is included within the state cannabis board’s list of eligible conditions. (A state-by-state guide is available.)

Dr. Jenny Wilkerson

Quality control also varies by product but is critical. “You want to look for certificates of quality assurance,” Jenny Wilkerson, PhD, a research assistant professor of pharmacodynamics at the University of Florida, Gainesville, said in an interview. (Dr. Wilkerson was not involved in the guideline development.)

“A good dispensary should have that information or at least be willing to get that information, but generally speaking, that is something that patients need to ask for,” she emphasized, noting that “most available mass readouts are not divided by lots.”

Initial counseling and AE monitoring and regular follow-up is important, especially among patients who’ve never tried medical cannabis (or older patients whose prior experience may be limited to weaker recreational marijuana).

Notably, the reliance on medical dispensaries to deliver the right information at the right time may prove to be faulty. While recent data show that frontline dispensary workers regularly provide information to customers on their medical conditions and available products, they rarely, if ever, base recommendations on provider input, and never or rarely discuss potential AEs and other risks.

Per the new guideline, inexperienced patients should be seen monthly until a stable dose is achieved; longer times between visits can be considered in those who are more experienced. Still, patients should be advised to contact their provider when pain relief or other goals are insufficient, or when response or problematic AEs occur. This facilitates down-titration to a previously tolerated dose, up-titration in CBD and/or THC, or a different route of administration/formulation altogether.

Dr. Wilkerson pointed out that follow-up visits also provide an opportunity to do a blood draw and ask the lab to conduct pharmacokinetic analysis.

If possible, “ask patients to [ensure that they] take a standard dose before the visit so that the lab can assess the blood percentage of primary compounds and metabolites in the product that they are using,” she explained, noting that the information is helping to determine how “the different ratios may be affecting therapeutic response in individual patients.”

Granted, the guideline is only a start. But it is a good one.

“A lot of physicians want to be able to hang their hat on evidence of the safety and efficacy of these products, and the analysis that was leveraged for this guideline was very rigorous,” Dr. Cooper said.

Not only do they reinforce that “oral cannabinoids can produce small improvements in pain and provide a dosing structure that minimizes risk to the patient, [but they] should be able to help educate physicians who [are looking] for a sense of what the literature tells us at this time,” she added.

“With chronic pain, we often find that different treatments will show small potential benefits and they have a certain risk profile,” Dr. Busse said.

“It’s almost impossible to know what patients think about this option unless you present them with the evidence and ask them to make a decision based on their values and preferences,” he said.

The Michael G. DeGroote Centre for Medicinal Cannabis Research funded the MAGIC Evidence Ecosystem Foundation to support the creation of the guideline. The center receives no funding from industry Dr. Busse, Dr. Cooper, and Dr. Wilkerson reported having no relevant financial relationships.

“Evidence alone is not sufficient for clinical decision-making, particularly in chronic pain,” said Jason Busse, DC, PhD, director of Michael G. DeGroote Centre for Medicinal Cannabis Research at McMaster University, Hamilton, Ont., and lead author of a newly released rapid guideline on medical cannabis or cannabinoids for chronic pain.

McMaster University

The recommendations, published online Sept. 9, 2021 in the British Medical Journal, suggest that providers offer patients with chronic pain a trial of noninhaled medical cannabis or cannabinoids if standard care or management is ineffective. However, the “weak” rating attached to the recommendation may compel some clinicians to automatically write off the panel’s recommendations.

“Because of the close balance between benefits and harms and wide variability in patient attitudes, the panel came to the conclusion that [some] patients presented with the current best evidence would likely choose to engage in a trial of medicinal cannabis, if their current care was felt to be suboptimal,” Dr. Busse explained in an interview.

But more importantly, “the recommendation allows for shared decision making to occur, and for different patients to make different decisions based on individual preferences and circumstances,” he said.
 

Evidence supports improved pain and sleep quality, physical functioning

Evidence supporting the use of medical cannabis in chronic pain is derived from a rigorous systematic review and meta-analysis of 32 studies enrolling 5,174 patients randomized to oral (capsule, spray, sublingual drops) or topical (transdermal cream) medical cannabis or placebo. Of note, three types of cannabinoids were represented: phytocannabinoids, synthetic, and endocannabinoids.

The studies included both patients with chronic noncancer pain (28 studies, n = 3,812) and chronic cancer pain not receiving palliative care (4 studies, n = 1,362). On average, baseline pain scores were a median 6.28 cm on a 10-cm visual analog scale (VAS), and median participant age was 53 years. 60% of trials reporting sex differences enrolled female participants. Overall, patients were followed for roughly 2 months (median, 50 days).

Findings (27 studies, n = 3,939) showed that, compared with placebo, medical cannabis resulted in a small, albeit important, improvement in the proportion of patients experiencing pain relief at or above the minimally important difference (MID) (moderate-certainty evidence, 10% modeled risk difference [RD; 95% confidence interval, 5%-15%] for achieving at least the MID of 1 cm).

Medical cannabis (15 studies, n = 2,425) also provided a small increase in the proportion of patients experiencing improvements in physical functioning at or above the MID (high certainty evidence, 4% modeled RD [95% CI, 0.1%-8%] for achieving at least a MID of 10 points).

Additionally, participants experienced significant improvements in sleep quality, compared with placebo (16 studies, 3,124 participants, high-quality evidence), demonstrating a weighted mean difference of –0.53 cm on a 10-cm VAS (95% CI, –0.75 to –0.30 cm). A total of nine larger trials (n = 2,652, high-certainty evidence) saw a small increase in the proportion of patients experiencing improved sleep quality at or above the MID: 6% modeled RD (95% CI, 2%-9%).

On the other hand, benefits did not extend to emotional, role, or social functioning (high-certainty evidence).

First do no harm: Start low, go slow

While these findings provide a rationale for medical cannabis in chronic pain, exploring options with patients can be challenging. Studies on medical cannabis consistently note that patients want information, but data also show that many providers express a lack of knowledge to provide adequate counseling.

There are also legal hurdles. Despite the authorization of medicinal cannabis across a majority of states and territories, cannabis is still a schedule I substance under the Federal Controlled Substances Act. In addition, the absence of standards around formulations, potency, and dosing has also been cited as a major barrier to recommending medical cannabis, as have concerns about adverse events (AEs), especially with inhaled and tetrahydrocannabinol (THC)-predominant formulations.

Like most medications, medical cannabis dosing should be individualized depending on product, patient, and ability to titrate the dose, but the guidelines provide a general rule of thumb. Providers considering therapeutic noninhaled medical cannabis trials are encouraged to start with a low-dose cannabidiol (CBD) oral tablet, spray, or sublingual oil drops 5 mg twice daily, increasing it by 10 mg every 2-3 days depending on the clinical response (to a maximum daily dose of 40 mg/day). If patient response is unsatisfactory, they should consider adding 1-2.5 mg THC/daily, titrated every 2-7 days to a maximum of 40 mg/day.

Still, an important caveat is whether or not adjunctive CBD alone is effective for chronic pain.

Dr. Ziva Cooper

“While we know that one out of seven U.S. adults are using cannabidiol, we know very little about its therapeutic effects when given by itself for pain,” Ziva Cooper, PhD, director of the Cannabis Research Initiative at the University of California, Los Angeles, and an associate professor at-large of psychology and behavioral science, said in an interview. (Dr. Cooper was not involved in the guideline development.)

“But patients tend to self-report that CBD is helpful, and at low doses, we know that it is unlikely to have adverse effects of any significant concern,” Dr. Cooper noted.

Depending on its components, medical cannabis is associated with a wide range of AEs. Studies comprising the evidence base for the guideline reported transient cognitive impairment (relative risk, 2.39; 95% CI, 1.06-5.38), vomiting (RR, 1.46; 95% CI, 1.07-1.99), and drowsiness (RR, 2.14; 95% CI, 1.55-2.95), attention impairment (RR, 4.04; 95% CI, 1.67-9.74), and nausea (RR, 1.59; 95% CI, 1.28-1.99). Of note, findings of a subgroup analysis showed that the risk of dizziness increased with treatment duration, starting at 3 months (test of interaction P = .002).

However, Dr. Cooper explained that, because the included studies were inconsistent in terms of cannabis type (e.g., some looked at synthetic THC or THC-like substances where others looked at a THC/CBD combination) and formulation (capsules, oral mucosal sprays), it’s difficult to tease out component-specific AEs.

“These are really important things to note, especially when you think about different populations that might be using these types of medicines moving forward,” she said.

Toward that end, the guideline specifically states that there is “no reason why the expected benefits would be systematically different among adolescents and emerging adults.”

Among children with cancer, prior study findings reinforce the conclusion that benefits are similar to adults, but studies in this area are limited to end-of-life treatment, childhood cancer with primarily palliative intent, or progressive or relapsed cancer. Because THC’s safety profile is less certain in children, it’s also important to consider adverse neurocognitive effects before initiating a medical cannabis trial in this population.
 

Navigating the landscape

Although promising, the medical cannabis landscape is undoubtedly difficult to navigate, with land mines ranging from a limited inability to simply pick up a prescribing pad to quality control.

With the exception of three Food and Drug Administration–approved products – dronabinol, cannabidiol Rx, and nabilone – U.S. providers are only able to ‘certify,’ not prescribe, medical cannabis for chronic pain, and only if it is included within the state cannabis board’s list of eligible conditions. (A state-by-state guide is available.)

Dr. Jenny Wilkerson

Quality control also varies by product but is critical. “You want to look for certificates of quality assurance,” Jenny Wilkerson, PhD, a research assistant professor of pharmacodynamics at the University of Florida, Gainesville, said in an interview. (Dr. Wilkerson was not involved in the guideline development.)

“A good dispensary should have that information or at least be willing to get that information, but generally speaking, that is something that patients need to ask for,” she emphasized, noting that “most available mass readouts are not divided by lots.”

Initial counseling and AE monitoring and regular follow-up is important, especially among patients who’ve never tried medical cannabis (or older patients whose prior experience may be limited to weaker recreational marijuana).

Notably, the reliance on medical dispensaries to deliver the right information at the right time may prove to be faulty. While recent data show that frontline dispensary workers regularly provide information to customers on their medical conditions and available products, they rarely, if ever, base recommendations on provider input, and never or rarely discuss potential AEs and other risks.

Per the new guideline, inexperienced patients should be seen monthly until a stable dose is achieved; longer times between visits can be considered in those who are more experienced. Still, patients should be advised to contact their provider when pain relief or other goals are insufficient, or when response or problematic AEs occur. This facilitates down-titration to a previously tolerated dose, up-titration in CBD and/or THC, or a different route of administration/formulation altogether.

Dr. Wilkerson pointed out that follow-up visits also provide an opportunity to do a blood draw and ask the lab to conduct pharmacokinetic analysis.

If possible, “ask patients to [ensure that they] take a standard dose before the visit so that the lab can assess the blood percentage of primary compounds and metabolites in the product that they are using,” she explained, noting that the information is helping to determine how “the different ratios may be affecting therapeutic response in individual patients.”

Granted, the guideline is only a start. But it is a good one.

“A lot of physicians want to be able to hang their hat on evidence of the safety and efficacy of these products, and the analysis that was leveraged for this guideline was very rigorous,” Dr. Cooper said.

Not only do they reinforce that “oral cannabinoids can produce small improvements in pain and provide a dosing structure that minimizes risk to the patient, [but they] should be able to help educate physicians who [are looking] for a sense of what the literature tells us at this time,” she added.

“With chronic pain, we often find that different treatments will show small potential benefits and they have a certain risk profile,” Dr. Busse said.

“It’s almost impossible to know what patients think about this option unless you present them with the evidence and ask them to make a decision based on their values and preferences,” he said.

The Michael G. DeGroote Centre for Medicinal Cannabis Research funded the MAGIC Evidence Ecosystem Foundation to support the creation of the guideline. The center receives no funding from industry Dr. Busse, Dr. Cooper, and Dr. Wilkerson reported having no relevant financial relationships.

Top-line results from a phase 2 study suggest vixotrigine (BIIB074, Biogen), a nonopioid investigational oral pain medication, reduces chronic neuropathic pain caused by small fiber neuropathy (SFN) and is generally well tolerated.

“We are encouraged by the overall results of the CONVEY study, especially given the significant unmet medical need for additional agents to treat chronic painful neuropathy,” Katherine Dawson, MD, senior vice president and head of the therapeutics development unit at Biogen, said in a news release.

Vixotrigine (BIIB074) is a peripherally and centrally acting, orally administered, voltage- and use-dependent voltage-gated sodium channel blocker.

CONVEY was a phase 2, placebo-controlled, double-blind, randomized withdrawal study of 265 patients experiencing pain from confirmed idiopathic or diabetes-associated SFN.

Following a 4-week open-label run-in period, 123 responders to vixotrigine were randomly allocated to 200 mg or 350 mg vixotrigine or placebo twice daily for 12 weeks in the double-blind portion of the study.

At week 12, vixotrigine 200 mg twice daily met the primary endpoint of a statistically significant reduction from baseline in the mean average daily pain (ADP) score versus placebo (P = .0501).

A subgroup analysis showed a treatment effect in patients with diabetes-associated SFN but not in the smaller subgroup of patients with idiopathic SFN.

The 200-mg dose also led to a significant improvement over placebo in mean worst daily pain score at 12 weeks (P = .0455).

A numeric advantage of 200 mg vixotrigine over placebo was observed in additional secondary endpoints, including the proportion of patients with at least a 2-point improvement in ADP score and the proportion with at least a 30% reduction in ADP at week 12, but these failed to reach statistical significance.

Vixotrigine 350 mg twice daily did not meet the primary endpoint of mean change in ADP at 12 weeks.

However, treatment at the higher dose led to a significant increase in the proportion of patients who reported being “very much improved” or “much improved” over baseline (P = .0580), Biogen reported.

In addition, a numeric advantage of 350 mg over placebo was observed in the proportion of patients with a 2-point or greater improvement in ADP score and the proportion with at least a 30% reduction in ADP at 12 weeks, but these also did not reach statistical significance.

Both doses of vixotrigine were “generally well tolerated and the safety profile was consistent with previous studies of vixotrigine with no evidence of abuse potential,” the company said.

In the open-label period, common adverse events seen in at least 2.5% of patients were dizziness, headache, vertigo, and nausea; adverse events led 5.3% of patients to discontinue the open-label portion of the study. Across the entire study, most adverse events were mild or moderate in severity.

“The totality of data from the vixotrigine program will inform potential doses for study in future phase 3 clinical trials,” the company said.

A version of this article first appeared on Medscape.com.

Top-line results from a phase 2 study suggest vixotrigine (BIIB074, Biogen), a nonopioid investigational oral pain medication, reduces chronic neuropathic pain caused by small fiber neuropathy (SFN) and is generally well tolerated.

“We are encouraged by the overall results of the CONVEY study, especially given the significant unmet medical need for additional agents to treat chronic painful neuropathy,” Katherine Dawson, MD, senior vice president and head of the therapeutics development unit at Biogen, said in a news release.

Vixotrigine (BIIB074) is a peripherally and centrally acting, orally administered, voltage- and use-dependent voltage-gated sodium channel blocker.

CONVEY was a phase 2, placebo-controlled, double-blind, randomized withdrawal study of 265 patients experiencing pain from confirmed idiopathic or diabetes-associated SFN.

Following a 4-week open-label run-in period, 123 responders to vixotrigine were randomly allocated to 200 mg or 350 mg vixotrigine or placebo twice daily for 12 weeks in the double-blind portion of the study.

At week 12, vixotrigine 200 mg twice daily met the primary endpoint of a statistically significant reduction from baseline in the mean average daily pain (ADP) score versus placebo (P = .0501).

A subgroup analysis showed a treatment effect in patients with diabetes-associated SFN but not in the smaller subgroup of patients with idiopathic SFN.

The 200-mg dose also led to a significant improvement over placebo in mean worst daily pain score at 12 weeks (P = .0455).

A numeric advantage of 200 mg vixotrigine over placebo was observed in additional secondary endpoints, including the proportion of patients with at least a 2-point improvement in ADP score and the proportion with at least a 30% reduction in ADP at week 12, but these failed to reach statistical significance.

Vixotrigine 350 mg twice daily did not meet the primary endpoint of mean change in ADP at 12 weeks.

However, treatment at the higher dose led to a significant increase in the proportion of patients who reported being “very much improved” or “much improved” over baseline (P = .0580), Biogen reported.

In addition, a numeric advantage of 350 mg over placebo was observed in the proportion of patients with a 2-point or greater improvement in ADP score and the proportion with at least a 30% reduction in ADP at 12 weeks, but these also did not reach statistical significance.

Both doses of vixotrigine were “generally well tolerated and the safety profile was consistent with previous studies of vixotrigine with no evidence of abuse potential,” the company said.

In the open-label period, common adverse events seen in at least 2.5% of patients were dizziness, headache, vertigo, and nausea; adverse events led 5.3% of patients to discontinue the open-label portion of the study. Across the entire study, most adverse events were mild or moderate in severity.

“The totality of data from the vixotrigine program will inform potential doses for study in future phase 3 clinical trials,” the company said.

A version of this article first appeared on Medscape.com.

Top-line results from a phase 2 study suggest vixotrigine (BIIB074, Biogen), a nonopioid investigational oral pain medication, reduces chronic neuropathic pain caused by small fiber neuropathy (SFN) and is generally well tolerated.

“We are encouraged by the overall results of the CONVEY study, especially given the significant unmet medical need for additional agents to treat chronic painful neuropathy,” Katherine Dawson, MD, senior vice president and head of the therapeutics development unit at Biogen, said in a news release.

Vixotrigine (BIIB074) is a peripherally and centrally acting, orally administered, voltage- and use-dependent voltage-gated sodium channel blocker.

CONVEY was a phase 2, placebo-controlled, double-blind, randomized withdrawal study of 265 patients experiencing pain from confirmed idiopathic or diabetes-associated SFN.

Following a 4-week open-label run-in period, 123 responders to vixotrigine were randomly allocated to 200 mg or 350 mg vixotrigine or placebo twice daily for 12 weeks in the double-blind portion of the study.

At week 12, vixotrigine 200 mg twice daily met the primary endpoint of a statistically significant reduction from baseline in the mean average daily pain (ADP) score versus placebo (P = .0501).

A subgroup analysis showed a treatment effect in patients with diabetes-associated SFN but not in the smaller subgroup of patients with idiopathic SFN.

The 200-mg dose also led to a significant improvement over placebo in mean worst daily pain score at 12 weeks (P = .0455).

A numeric advantage of 200 mg vixotrigine over placebo was observed in additional secondary endpoints, including the proportion of patients with at least a 2-point improvement in ADP score and the proportion with at least a 30% reduction in ADP at week 12, but these failed to reach statistical significance.

Vixotrigine 350 mg twice daily did not meet the primary endpoint of mean change in ADP at 12 weeks.

However, treatment at the higher dose led to a significant increase in the proportion of patients who reported being “very much improved” or “much improved” over baseline (P = .0580), Biogen reported.

In addition, a numeric advantage of 350 mg over placebo was observed in the proportion of patients with a 2-point or greater improvement in ADP score and the proportion with at least a 30% reduction in ADP at 12 weeks, but these also did not reach statistical significance.

Both doses of vixotrigine were “generally well tolerated and the safety profile was consistent with previous studies of vixotrigine with no evidence of abuse potential,” the company said.

In the open-label period, common adverse events seen in at least 2.5% of patients were dizziness, headache, vertigo, and nausea; adverse events led 5.3% of patients to discontinue the open-label portion of the study. Across the entire study, most adverse events were mild or moderate in severity.

“The totality of data from the vixotrigine program will inform potential doses for study in future phase 3 clinical trials,” the company said.

A version of this article first appeared on Medscape.com.

For patients with endometriosis-related dysmenorrhea, it is cost effective to use medical therapy before surgery, according to investigators.

A stepwise strategy involving two medications, then surgery, was associated with the lowest cost per quality-adjusted life-years (QALYs), reported lead author, Jacqueline A. Bohn, MD, of Oregon Health & Science University, Portland, and colleagues.

“In 2009, the medical costs associated with endometriosis in the United States were estimated at $69.4 billion annually,” the investigators wrote in Obstetrics and Gynecology. “Despite the recognized cost burden of this disease, cost-effectiveness data on the various treatment strategies is limited. Previous studies have investigated the direct and indirect costs regarding endometriosis; however, there are no prior studies that evaluate the cost-effectiveness of a stepwise regimen to guide management.”

To fill this knowledge gap, Dr. Bohn and colleagues created a cost-effectiveness model comparing four treatment strategies:

NSAIDs, then surgery

NSAIDs, then short-acting reversible contraceptives or long-acting reversible contraceptives (LARCs), then surgery

NSAIDs, then a short-acting reversible contraceptive or a LARC, then a LARC or gonadotropin-releasing hormone (GnRH) modulator, then surgery

Surgery alone

The analysis, which compared costs, QALYs, and incremental cost-effectiveness ratios, involved a theoretical cohort of 4,817,894 women aged 18-45 years, representing the estimated number of reproductive-age women in the United States with endometriosis-related dysmenorrhea. Costs were determined from published literature and inflated to 2019 dollars. Medical treatments were theoretically given for 6 months each, and the cost of laparoscopic surgery incorporated 12 months of postoperative care.

Of the four strategies, the two-medication approach was most cost effective, with a cost per QALY of $1,158. This was followed closely by the three-medication regimen, at $1,158, the single-medication regimen, at $2,108, and finally, surgery alone, at $4,338.

“We found that, although cost effective, requiring trial of a third medication offered little comparative advantage before proceeding directly to surgery after the second therapy fails,” the investigators wrote. “Yet, for the woman who is anxious about surgical intervention, or when a prolonged wait for a surgical specialist occurs, trial of a GnRH modulator may be worthwhile.”

Compared with surgery alone, each regimen starting with medical therapy remained below the standard willingness-to-pay threshold of $100,000 per QALY; however, the investigators recommend against trying more than three medications.

“Delaying surgical management in a woman with pain refractory to more than three medications may decrease quality of life and further increase cost,” they wrote.

To make surgery alone the most cost-effective option, surgery success would need to exceed 83%, Dr. Bohn and colleagues concluded.

According to Hugh Taylor, MD, of Yale University, New Haven, Conn., it’s unlikely that this surgery success threshold will be met, since surgery alone typically leads to recurrence.

“We know there’s a very high relapse rate after surgery,” Dr. Taylor said in an interview. “Even if the surgery may be initially successful, there’s roughly a 50% recurrence rate after about 2 years. So, finding the right medical therapy will give you more chance for long-term success.”

Dr. Taylor said it’s “really nice” that Dr. Bohn and colleagues conducted a sequential analysis because the findings support the most common approach in real-world practice.

“It confirms that starting with a medical therapy prior to surgery is an appropriate, successful treatment for endometriosis, which is something that many, many people in the community do, but we haven’t had a real trial to show that,” he said.

Dr. Taylor offered two areas of improvement for similar studies in the future: First, he suggested separating LARCs from oral contraceptives because LARCs may be less effective for some patients with endometriosis; and second, he suggested that limiting the third medication to a GnRH antagonist would be more applicable to real-world practice than using the broader category of GnRH modulators.

Although the three-medication approach involving a GnRH modulator was slightly more expensive than the two-medication approach, Dr. Taylor said the costs were so similar that a three-medication approach is “still reasonable,” particularly because it could spare patients from surgery.

Dr. Taylor also speculated that trying a GnRH antagonist could become more cost effective soon. Although only one GnRH antagonist is currently on the market, he noted that a second agent is poised for Food and Drug Administration approval, while a third is in the pipeline, and this competition may decrease drug prices.

The investigators disclosed support from the National Institutes of Health, Arnold Ventures, the World Health Organization, Merck, and others. Dr. Taylor reported that Yale University receives funding for endometriosis biomarker research from AbbVie.

For patients with endometriosis-related dysmenorrhea, it is cost effective to use medical therapy before surgery, according to investigators.

A stepwise strategy involving two medications, then surgery, was associated with the lowest cost per quality-adjusted life-years (QALYs), reported lead author, Jacqueline A. Bohn, MD, of Oregon Health & Science University, Portland, and colleagues.

“In 2009, the medical costs associated with endometriosis in the United States were estimated at $69.4 billion annually,” the investigators wrote in Obstetrics and Gynecology. “Despite the recognized cost burden of this disease, cost-effectiveness data on the various treatment strategies is limited. Previous studies have investigated the direct and indirect costs regarding endometriosis; however, there are no prior studies that evaluate the cost-effectiveness of a stepwise regimen to guide management.”

To fill this knowledge gap, Dr. Bohn and colleagues created a cost-effectiveness model comparing four treatment strategies:

NSAIDs, then surgery

NSAIDs, then short-acting reversible contraceptives or long-acting reversible contraceptives (LARCs), then surgery

NSAIDs, then a short-acting reversible contraceptive or a LARC, then a LARC or gonadotropin-releasing hormone (GnRH) modulator, then surgery

Surgery alone

The analysis, which compared costs, QALYs, and incremental cost-effectiveness ratios, involved a theoretical cohort of 4,817,894 women aged 18-45 years, representing the estimated number of reproductive-age women in the United States with endometriosis-related dysmenorrhea. Costs were determined from published literature and inflated to 2019 dollars. Medical treatments were theoretically given for 6 months each, and the cost of laparoscopic surgery incorporated 12 months of postoperative care.

Of the four strategies, the two-medication approach was most cost effective, with a cost per QALY of $1,158. This was followed closely by the three-medication regimen, at $1,158, the single-medication regimen, at $2,108, and finally, surgery alone, at $4,338.

“We found that, although cost effective, requiring trial of a third medication offered little comparative advantage before proceeding directly to surgery after the second therapy fails,” the investigators wrote. “Yet, for the woman who is anxious about surgical intervention, or when a prolonged wait for a surgical specialist occurs, trial of a GnRH modulator may be worthwhile.”

Compared with surgery alone, each regimen starting with medical therapy remained below the standard willingness-to-pay threshold of $100,000 per QALY; however, the investigators recommend against trying more than three medications.

“Delaying surgical management in a woman with pain refractory to more than three medications may decrease quality of life and further increase cost,” they wrote.

To make surgery alone the most cost-effective option, surgery success would need to exceed 83%, Dr. Bohn and colleagues concluded.

According to Hugh Taylor, MD, of Yale University, New Haven, Conn., it’s unlikely that this surgery success threshold will be met, since surgery alone typically leads to recurrence.

“We know there’s a very high relapse rate after surgery,” Dr. Taylor said in an interview. “Even if the surgery may be initially successful, there’s roughly a 50% recurrence rate after about 2 years. So, finding the right medical therapy will give you more chance for long-term success.”

Dr. Taylor said it’s “really nice” that Dr. Bohn and colleagues conducted a sequential analysis because the findings support the most common approach in real-world practice.

“It confirms that starting with a medical therapy prior to surgery is an appropriate, successful treatment for endometriosis, which is something that many, many people in the community do, but we haven’t had a real trial to show that,” he said.

Dr. Taylor offered two areas of improvement for similar studies in the future: First, he suggested separating LARCs from oral contraceptives because LARCs may be less effective for some patients with endometriosis; and second, he suggested that limiting the third medication to a GnRH antagonist would be more applicable to real-world practice than using the broader category of GnRH modulators.

Although the three-medication approach involving a GnRH modulator was slightly more expensive than the two-medication approach, Dr. Taylor said the costs were so similar that a three-medication approach is “still reasonable,” particularly because it could spare patients from surgery.

Dr. Taylor also speculated that trying a GnRH antagonist could become more cost effective soon. Although only one GnRH antagonist is currently on the market, he noted that a second agent is poised for Food and Drug Administration approval, while a third is in the pipeline, and this competition may decrease drug prices.

The investigators disclosed support from the National Institutes of Health, Arnold Ventures, the World Health Organization, Merck, and others. Dr. Taylor reported that Yale University receives funding for endometriosis biomarker research from AbbVie.

For patients with endometriosis-related dysmenorrhea, it is cost effective to use medical therapy before surgery, according to investigators.

A stepwise strategy involving two medications, then surgery, was associated with the lowest cost per quality-adjusted life-years (QALYs), reported lead author, Jacqueline A. Bohn, MD, of Oregon Health & Science University, Portland, and colleagues.

“In 2009, the medical costs associated with endometriosis in the United States were estimated at $69.4 billion annually,” the investigators wrote in Obstetrics and Gynecology. “Despite the recognized cost burden of this disease, cost-effectiveness data on the various treatment strategies is limited. Previous studies have investigated the direct and indirect costs regarding endometriosis; however, there are no prior studies that evaluate the cost-effectiveness of a stepwise regimen to guide management.”

To fill this knowledge gap, Dr. Bohn and colleagues created a cost-effectiveness model comparing four treatment strategies:

NSAIDs, then surgery

NSAIDs, then short-acting reversible contraceptives or long-acting reversible contraceptives (LARCs), then surgery

NSAIDs, then a short-acting reversible contraceptive or a LARC, then a LARC or gonadotropin-releasing hormone (GnRH) modulator, then surgery

Surgery alone

The analysis, which compared costs, QALYs, and incremental cost-effectiveness ratios, involved a theoretical cohort of 4,817,894 women aged 18-45 years, representing the estimated number of reproductive-age women in the United States with endometriosis-related dysmenorrhea. Costs were determined from published literature and inflated to 2019 dollars. Medical treatments were theoretically given for 6 months each, and the cost of laparoscopic surgery incorporated 12 months of postoperative care.

Of the four strategies, the two-medication approach was most cost effective, with a cost per QALY of $1,158. This was followed closely by the three-medication regimen, at $1,158, the single-medication regimen, at $2,108, and finally, surgery alone, at $4,338.

“We found that, although cost effective, requiring trial of a third medication offered little comparative advantage before proceeding directly to surgery after the second therapy fails,” the investigators wrote. “Yet, for the woman who is anxious about surgical intervention, or when a prolonged wait for a surgical specialist occurs, trial of a GnRH modulator may be worthwhile.”

Compared with surgery alone, each regimen starting with medical therapy remained below the standard willingness-to-pay threshold of $100,000 per QALY; however, the investigators recommend against trying more than three medications.

“Delaying surgical management in a woman with pain refractory to more than three medications may decrease quality of life and further increase cost,” they wrote.

To make surgery alone the most cost-effective option, surgery success would need to exceed 83%, Dr. Bohn and colleagues concluded.

According to Hugh Taylor, MD, of Yale University, New Haven, Conn., it’s unlikely that this surgery success threshold will be met, since surgery alone typically leads to recurrence.

“We know there’s a very high relapse rate after surgery,” Dr. Taylor said in an interview. “Even if the surgery may be initially successful, there’s roughly a 50% recurrence rate after about 2 years. So, finding the right medical therapy will give you more chance for long-term success.”

Dr. Taylor said it’s “really nice” that Dr. Bohn and colleagues conducted a sequential analysis because the findings support the most common approach in real-world practice.

“It confirms that starting with a medical therapy prior to surgery is an appropriate, successful treatment for endometriosis, which is something that many, many people in the community do, but we haven’t had a real trial to show that,” he said.

Dr. Taylor offered two areas of improvement for similar studies in the future: First, he suggested separating LARCs from oral contraceptives because LARCs may be less effective for some patients with endometriosis; and second, he suggested that limiting the third medication to a GnRH antagonist would be more applicable to real-world practice than using the broader category of GnRH modulators.

Although the three-medication approach involving a GnRH modulator was slightly more expensive than the two-medication approach, Dr. Taylor said the costs were so similar that a three-medication approach is “still reasonable,” particularly because it could spare patients from surgery.

Dr. Taylor also speculated that trying a GnRH antagonist could become more cost effective soon. Although only one GnRH antagonist is currently on the market, he noted that a second agent is poised for Food and Drug Administration approval, while a third is in the pipeline, and this competition may decrease drug prices.

The investigators disclosed support from the National Institutes of Health, Arnold Ventures, the World Health Organization, Merck, and others. Dr. Taylor reported that Yale University receives funding for endometriosis biomarker research from AbbVie.

Opioid-related drug overdose deaths in the United States exploded to an estimated record high of 69,031 people in 2020, topping the 49,860 deaths logged in 2019, according to a new report from the Centers for Disease Control and Prevention. Most of the deaths involved synthetic opioids such as fentanyl.

President Joe Biden has pledged more than $10 billion to expand access to prevention, treatment, and recovery services. The money is important as people receiving treatment for opioid use disorder have a high risk for relapse, and that means a high risk for opioid overdose.

Now, researchers are studying a possible bridge to successful recovery: A vaccine that could blunt the drugs’ ability to cause harm.

The first such vaccines are now entering clinical trials, raising hopes of adding another tool to the antiaddiction armamentarium. But even if the vaccines prove safe and effective, their success could generate some new problems to solve.

An advantage of vaccines is that their effects can last for several months, said trial investigator Sandra Comer, PhD, professor of neurobiology and psychiatry at Columbia University Irving Medical Center, New York. Dropout rates for existing medical therapies for opioid use disorder are as high as 50% at 6 months, and a vaccine could protect people from overdose and give them time to re-enter treatment.

“It serves as a bit of a safety net,” she said.

The first vaccine to enter a trial targets oxycodone. Volunteers are being recruited who have a diagnosis of opioid use disorder but are not being medically treated and are still using opioids. A third of them will receive a placebo vaccine, a third will receive a low-dose injection of vaccine, and the other third will receive a high-dose vaccine.
 

A shot against oxycodone

Researchers are primarily tracking the safety of the shot, but they’re also looking at whether vaccination prevents the euphoria that opioids usually produce. They expect to enroll 24 people initially but expand to 45 if results look promising.

In response to the shot, the body produces antibodies, proteins that tag oxycodone and keep it from reaching the brain. If the drug can’t reach brain cells, it can’t produce euphoria. And more important for lifesaving effects, it can’t block the brain’s signals to the body to breathe. The vaccine has already performed well in animal studies.

Previous trials of vaccines for cocaine and nicotine failed. Those vaccines made it to the last clinical trial stage, but didn’t prove effective overall. So this time, investigators plan to track antibody levels in participants, examining blood samples for signs of a good immune response to the vaccine.

But even though earlier cocaine and nicotine vaccines didn’t work for everybody, there were some people they seemed to help. This is why investigators involved in opioid vaccine trials want to track immune responses, said Marco Pravetoni, PhD, associate professor of pharmacology and medicine at the University of Minnesota, Minneapolis, whose team will be assessing the blood samples. Ultimately, a doctor might even be able to use this information to tailor vaccine selection to a specific person.

Dr. Pravetoni also said that oxycodone is one of three vaccine targets – the other two are heroin and fentanyl – that researchers hope to combine into a single shot. Recipients might need to have one shot a month for the first 3 to 4 months and then receive annual boosters.
 

Stopping the pain

The vaccines also raise some issues that need attention, said Cody Wenthur, PharmD, PhD, assistant professor of pharmacy at the University of Wisconsin–Madison, who is not involved in the vaccine trials.

“If you’re vaccinated against oxycodone, you might not have access to adequate pain control if you get into a car accident, for example,” he said.

Clinicians could use other opioids for pain management, but limiting the opioids that the vaccine targets is a “double-edged sword,” said Dr. Wenthur, because vaccinated people could just switch their opioid of choice to one that a vaccine does not inhibit.

Although these issues need to be addressed, vaccines, if successful, will have an important role. Dr. Wenthur noted a survey of pharmacists and pharmacy students that he and his group conducted showing that respondents “overwhelmingly” viewed a potential vaccine as helpful.

If the vaccines do become available, their application could extend beyond people who have opioid use disorder, said Dr. Pravetoni. He mentioned the 2002 incident when terrorists took over a theater in Moscow and Russian special forces are thought to have used an aerosolized form of fentanyl to incapacitate everyone in the room. More than 100 of the hostages died, and the episode raised the specter of opioids being used in chemical attacks.

Dr. Pravetoni said vaccination could offer protection for first responders, law enforcement or other people whose professions place them at risk for inhalation, either accidentally or through such attacks.

These or other real-world applications for people at risk for exposure are several years away. Dr. Pravetoni said it took 10 years to get to this phase and estimates that, in about 5 years, a vaccine that targets multiple opioid drugs might enter the first clinical trial.

A version of this article first appeared on WebMD.com.

Opioid-related drug overdose deaths in the United States exploded to an estimated record high of 69,031 people in 2020, topping the 49,860 deaths logged in 2019, according to a new report from the Centers for Disease Control and Prevention. Most of the deaths involved synthetic opioids such as fentanyl.

President Joe Biden has pledged more than $10 billion to expand access to prevention, treatment, and recovery services. The money is important as people receiving treatment for opioid use disorder have a high risk for relapse, and that means a high risk for opioid overdose.

Now, researchers are studying a possible bridge to successful recovery: A vaccine that could blunt the drugs’ ability to cause harm.

The first such vaccines are now entering clinical trials, raising hopes of adding another tool to the antiaddiction armamentarium. But even if the vaccines prove safe and effective, their success could generate some new problems to solve.

An advantage of vaccines is that their effects can last for several months, said trial investigator Sandra Comer, PhD, professor of neurobiology and psychiatry at Columbia University Irving Medical Center, New York. Dropout rates for existing medical therapies for opioid use disorder are as high as 50% at 6 months, and a vaccine could protect people from overdose and give them time to re-enter treatment.

“It serves as a bit of a safety net,” she said.

The first vaccine to enter a trial targets oxycodone. Volunteers are being recruited who have a diagnosis of opioid use disorder but are not being medically treated and are still using opioids. A third of them will receive a placebo vaccine, a third will receive a low-dose injection of vaccine, and the other third will receive a high-dose vaccine.
 

A shot against oxycodone

Researchers are primarily tracking the safety of the shot, but they’re also looking at whether vaccination prevents the euphoria that opioids usually produce. They expect to enroll 24 people initially but expand to 45 if results look promising.

In response to the shot, the body produces antibodies, proteins that tag oxycodone and keep it from reaching the brain. If the drug can’t reach brain cells, it can’t produce euphoria. And more important for lifesaving effects, it can’t block the brain’s signals to the body to breathe. The vaccine has already performed well in animal studies.

Previous trials of vaccines for cocaine and nicotine failed. Those vaccines made it to the last clinical trial stage, but didn’t prove effective overall. So this time, investigators plan to track antibody levels in participants, examining blood samples for signs of a good immune response to the vaccine.

But even though earlier cocaine and nicotine vaccines didn’t work for everybody, there were some people they seemed to help. This is why investigators involved in opioid vaccine trials want to track immune responses, said Marco Pravetoni, PhD, associate professor of pharmacology and medicine at the University of Minnesota, Minneapolis, whose team will be assessing the blood samples. Ultimately, a doctor might even be able to use this information to tailor vaccine selection to a specific person.

Dr. Pravetoni also said that oxycodone is one of three vaccine targets – the other two are heroin and fentanyl – that researchers hope to combine into a single shot. Recipients might need to have one shot a month for the first 3 to 4 months and then receive annual boosters.
 

Stopping the pain

The vaccines also raise some issues that need attention, said Cody Wenthur, PharmD, PhD, assistant professor of pharmacy at the University of Wisconsin–Madison, who is not involved in the vaccine trials.

“If you’re vaccinated against oxycodone, you might not have access to adequate pain control if you get into a car accident, for example,” he said.

Clinicians could use other opioids for pain management, but limiting the opioids that the vaccine targets is a “double-edged sword,” said Dr. Wenthur, because vaccinated people could just switch their opioid of choice to one that a vaccine does not inhibit.

Although these issues need to be addressed, vaccines, if successful, will have an important role. Dr. Wenthur noted a survey of pharmacists and pharmacy students that he and his group conducted showing that respondents “overwhelmingly” viewed a potential vaccine as helpful.

If the vaccines do become available, their application could extend beyond people who have opioid use disorder, said Dr. Pravetoni. He mentioned the 2002 incident when terrorists took over a theater in Moscow and Russian special forces are thought to have used an aerosolized form of fentanyl to incapacitate everyone in the room. More than 100 of the hostages died, and the episode raised the specter of opioids being used in chemical attacks.

Dr. Pravetoni said vaccination could offer protection for first responders, law enforcement or other people whose professions place them at risk for inhalation, either accidentally or through such attacks.

These or other real-world applications for people at risk for exposure are several years away. Dr. Pravetoni said it took 10 years to get to this phase and estimates that, in about 5 years, a vaccine that targets multiple opioid drugs might enter the first clinical trial.

A version of this article first appeared on WebMD.com.

Opioid-related drug overdose deaths in the United States exploded to an estimated record high of 69,031 people in 2020, topping the 49,860 deaths logged in 2019, according to a new report from the Centers for Disease Control and Prevention. Most of the deaths involved synthetic opioids such as fentanyl.

President Joe Biden has pledged more than $10 billion to expand access to prevention, treatment, and recovery services. The money is important as people receiving treatment for opioid use disorder have a high risk for relapse, and that means a high risk for opioid overdose.

Now, researchers are studying a possible bridge to successful recovery: A vaccine that could blunt the drugs’ ability to cause harm.

The first such vaccines are now entering clinical trials, raising hopes of adding another tool to the antiaddiction armamentarium. But even if the vaccines prove safe and effective, their success could generate some new problems to solve.

An advantage of vaccines is that their effects can last for several months, said trial investigator Sandra Comer, PhD, professor of neurobiology and psychiatry at Columbia University Irving Medical Center, New York. Dropout rates for existing medical therapies for opioid use disorder are as high as 50% at 6 months, and a vaccine could protect people from overdose and give them time to re-enter treatment.

“It serves as a bit of a safety net,” she said.

The first vaccine to enter a trial targets oxycodone. Volunteers are being recruited who have a diagnosis of opioid use disorder but are not being medically treated and are still using opioids. A third of them will receive a placebo vaccine, a third will receive a low-dose injection of vaccine, and the other third will receive a high-dose vaccine.
 

A shot against oxycodone

Researchers are primarily tracking the safety of the shot, but they’re also looking at whether vaccination prevents the euphoria that opioids usually produce. They expect to enroll 24 people initially but expand to 45 if results look promising.

In response to the shot, the body produces antibodies, proteins that tag oxycodone and keep it from reaching the brain. If the drug can’t reach brain cells, it can’t produce euphoria. And more important for lifesaving effects, it can’t block the brain’s signals to the body to breathe. The vaccine has already performed well in animal studies.

Previous trials of vaccines for cocaine and nicotine failed. Those vaccines made it to the last clinical trial stage, but didn’t prove effective overall. So this time, investigators plan to track antibody levels in participants, examining blood samples for signs of a good immune response to the vaccine.

But even though earlier cocaine and nicotine vaccines didn’t work for everybody, there were some people they seemed to help. This is why investigators involved in opioid vaccine trials want to track immune responses, said Marco Pravetoni, PhD, associate professor of pharmacology and medicine at the University of Minnesota, Minneapolis, whose team will be assessing the blood samples. Ultimately, a doctor might even be able to use this information to tailor vaccine selection to a specific person.

Dr. Pravetoni also said that oxycodone is one of three vaccine targets – the other two are heroin and fentanyl – that researchers hope to combine into a single shot. Recipients might need to have one shot a month for the first 3 to 4 months and then receive annual boosters.
 

Stopping the pain

The vaccines also raise some issues that need attention, said Cody Wenthur, PharmD, PhD, assistant professor of pharmacy at the University of Wisconsin–Madison, who is not involved in the vaccine trials.

“If you’re vaccinated against oxycodone, you might not have access to adequate pain control if you get into a car accident, for example,” he said.

Clinicians could use other opioids for pain management, but limiting the opioids that the vaccine targets is a “double-edged sword,” said Dr. Wenthur, because vaccinated people could just switch their opioid of choice to one that a vaccine does not inhibit.

Although these issues need to be addressed, vaccines, if successful, will have an important role. Dr. Wenthur noted a survey of pharmacists and pharmacy students that he and his group conducted showing that respondents “overwhelmingly” viewed a potential vaccine as helpful.

If the vaccines do become available, their application could extend beyond people who have opioid use disorder, said Dr. Pravetoni. He mentioned the 2002 incident when terrorists took over a theater in Moscow and Russian special forces are thought to have used an aerosolized form of fentanyl to incapacitate everyone in the room. More than 100 of the hostages died, and the episode raised the specter of opioids being used in chemical attacks.

Dr. Pravetoni said vaccination could offer protection for first responders, law enforcement or other people whose professions place them at risk for inhalation, either accidentally or through such attacks.

These or other real-world applications for people at risk for exposure are several years away. Dr. Pravetoni said it took 10 years to get to this phase and estimates that, in about 5 years, a vaccine that targets multiple opioid drugs might enter the first clinical trial.

A version of this article first appeared on WebMD.com.

Opioid overdoses usually aren’t fatal, but a new review of numerous studies, mostly case reports and case series, suggests that they can have long-lasting effects on cognition, possibly because of hypoxia resulting from respiratory depression.

Erin L. Winstanley, PhD, MA, and associates noted in the review that opioids cause about 80% of worldwide deaths from illicit drug use, and the Centers for Disease Control and Prevention’s provisional August 2021 number of more than 88,000 opioid-caused deaths in the United States is the highest ever recorded – a 27% increase over what was reported last December. That number suggests that the opioid epidemic continues to rage, but the study results also show that the neurological consequences of nonfatal overdoses are an important public health problem.

And that’s something that may be overlooked, according to Mark S. Gold, MD, who was not involved with the study and was asked to comment on the review, which was published in the Journal of Addiction Science.

“Assuming that an overdose has no effect on the brain, mood, and behavior is not supported by experience or the literature. While reversing overdoses is life-saving, preventing overdose may be brain saving,” said Dr. Gold. He is a University of Florida, Gainesville, Emeritus Eminent Scholar, adjunct professor of psychiatry at Washington University in St. Louis, and a member of the clinical council of Washington University’s Public Health Institute.

A common pattern among patients with opioid use disorder (OUD) is that they undergo treatment with medication-assisted therapy (MAT), only to drop out of treatment and then repeat the treatment at a later date. That suggests that physicians should take a harder look at the limitations of MAT and other treatments, Dr. Gold said.

Although the review found some associations between neurocognitive deficits and opioid overdose, the authors point out that it is difficult to make direct comparisons because of biases and differences in methodology among the included studies. They were not able to reach conclusions about the prevalence of brain injuries following nonfatal opioid overdoses. Few included studies controlled for confounding factors that might contribute to or explain neurocognitive impairments, reported Dr. Winstanley, associate professor in the department of behavioral medicine and psychiatry at the University of West Virginia, Morgantown, and associates.

Still, distinct patterns emerged from the analysis of almost 3,500 subjects in 79 studies in 21 countries. Twenty-nine studies reported diagnoses of leukoencephalopathy, which affects white matter. Spongiform leukoencephalopathy is known to occur secondarily after exposure to a variety of toxic agents, including carbon monoxide poisoning and drugs of abuse. The damage can lead to erosion of higher cerebral function. The condition can occur from 2 to 180 days after a hypoxic brain injury, potentially complicating efforts to attribute it specifically to an opioid overdose. Amnestic syndrome was also reported in some studies. One study found that about 39% of people seeking buprenorphine treatment suffered from neurocognitive impairment.

Dr. Gold called the study’s findings novel and of public health importance. “Each overdose takes a toll on the body, and especially the brain,” he said.
 

Better documentation needed

The variability in symptoms, as well as their timing, present challenges to initial treatment, which often occur before a patient reaches the hospital. This is a vital window because the length of time of inadequate respiration because of opioid overdose is likely to predict the extent of brain injury. The duration of inadequate respiration may not be captured in electronic medical records, and emergency departments don’t typically collect toxicology information, which may lead health care providers to attribute neurocognitive impairments to ongoing drug use rather than an acute anoxic or hypoxic episode. Further neurocognitive damage may have a delayed onset, and better documentation of these events could help physicians determine whether those symptoms stem from the acute event.

Dr. Winstanley and associates called for more research, including prospective case-control studies to identify brain changes following opioid-related overdose.

The authors also suggested that physicians might want to consider screening patients who experience prolonged anoxia or hypoxia for neurocognitive impairments and brain injuries. Dr. Gold agreed.

“Clinicians working with OUD patients should take these data to heart and take a comprehensive history of previous overdoses, loss of consciousness, head trauma, and following up on the history with neuropsychological and other tests of brain function,” Dr. Gold said. “After an assessment, rehabilitation and treatment might then be more personalized and effective.”

Dr. Gold had no relevant financial disclosures.

Opioid overdoses usually aren’t fatal, but a new review of numerous studies, mostly case reports and case series, suggests that they can have long-lasting effects on cognition, possibly because of hypoxia resulting from respiratory depression.

Erin L. Winstanley, PhD, MA, and associates noted in the review that opioids cause about 80% of worldwide deaths from illicit drug use, and the Centers for Disease Control and Prevention’s provisional August 2021 number of more than 88,000 opioid-caused deaths in the United States is the highest ever recorded – a 27% increase over what was reported last December. That number suggests that the opioid epidemic continues to rage, but the study results also show that the neurological consequences of nonfatal overdoses are an important public health problem.

And that’s something that may be overlooked, according to Mark S. Gold, MD, who was not involved with the study and was asked to comment on the review, which was published in the Journal of Addiction Science.

“Assuming that an overdose has no effect on the brain, mood, and behavior is not supported by experience or the literature. While reversing overdoses is life-saving, preventing overdose may be brain saving,” said Dr. Gold. He is a University of Florida, Gainesville, Emeritus Eminent Scholar, adjunct professor of psychiatry at Washington University in St. Louis, and a member of the clinical council of Washington University’s Public Health Institute.

A common pattern among patients with opioid use disorder (OUD) is that they undergo treatment with medication-assisted therapy (MAT), only to drop out of treatment and then repeat the treatment at a later date. That suggests that physicians should take a harder look at the limitations of MAT and other treatments, Dr. Gold said.

Although the review found some associations between neurocognitive deficits and opioid overdose, the authors point out that it is difficult to make direct comparisons because of biases and differences in methodology among the included studies. They were not able to reach conclusions about the prevalence of brain injuries following nonfatal opioid overdoses. Few included studies controlled for confounding factors that might contribute to or explain neurocognitive impairments, reported Dr. Winstanley, associate professor in the department of behavioral medicine and psychiatry at the University of West Virginia, Morgantown, and associates.

Still, distinct patterns emerged from the analysis of almost 3,500 subjects in 79 studies in 21 countries. Twenty-nine studies reported diagnoses of leukoencephalopathy, which affects white matter. Spongiform leukoencephalopathy is known to occur secondarily after exposure to a variety of toxic agents, including carbon monoxide poisoning and drugs of abuse. The damage can lead to erosion of higher cerebral function. The condition can occur from 2 to 180 days after a hypoxic brain injury, potentially complicating efforts to attribute it specifically to an opioid overdose. Amnestic syndrome was also reported in some studies. One study found that about 39% of people seeking buprenorphine treatment suffered from neurocognitive impairment.

Dr. Gold called the study’s findings novel and of public health importance. “Each overdose takes a toll on the body, and especially the brain,” he said.
 

Better documentation needed

The variability in symptoms, as well as their timing, present challenges to initial treatment, which often occur before a patient reaches the hospital. This is a vital window because the length of time of inadequate respiration because of opioid overdose is likely to predict the extent of brain injury. The duration of inadequate respiration may not be captured in electronic medical records, and emergency departments don’t typically collect toxicology information, which may lead health care providers to attribute neurocognitive impairments to ongoing drug use rather than an acute anoxic or hypoxic episode. Further neurocognitive damage may have a delayed onset, and better documentation of these events could help physicians determine whether those symptoms stem from the acute event.

Dr. Winstanley and associates called for more research, including prospective case-control studies to identify brain changes following opioid-related overdose.

The authors also suggested that physicians might want to consider screening patients who experience prolonged anoxia or hypoxia for neurocognitive impairments and brain injuries. Dr. Gold agreed.

“Clinicians working with OUD patients should take these data to heart and take a comprehensive history of previous overdoses, loss of consciousness, head trauma, and following up on the history with neuropsychological and other tests of brain function,” Dr. Gold said. “After an assessment, rehabilitation and treatment might then be more personalized and effective.”

Dr. Gold had no relevant financial disclosures.

Opioid overdoses usually aren’t fatal, but a new review of numerous studies, mostly case reports and case series, suggests that they can have long-lasting effects on cognition, possibly because of hypoxia resulting from respiratory depression.

Erin L. Winstanley, PhD, MA, and associates noted in the review that opioids cause about 80% of worldwide deaths from illicit drug use, and the Centers for Disease Control and Prevention’s provisional August 2021 number of more than 88,000 opioid-caused deaths in the United States is the highest ever recorded – a 27% increase over what was reported last December. That number suggests that the opioid epidemic continues to rage, but the study results also show that the neurological consequences of nonfatal overdoses are an important public health problem.

And that’s something that may be overlooked, according to Mark S. Gold, MD, who was not involved with the study and was asked to comment on the review, which was published in the Journal of Addiction Science.

“Assuming that an overdose has no effect on the brain, mood, and behavior is not supported by experience or the literature. While reversing overdoses is life-saving, preventing overdose may be brain saving,” said Dr. Gold. He is a University of Florida, Gainesville, Emeritus Eminent Scholar, adjunct professor of psychiatry at Washington University in St. Louis, and a member of the clinical council of Washington University’s Public Health Institute.

A common pattern among patients with opioid use disorder (OUD) is that they undergo treatment with medication-assisted therapy (MAT), only to drop out of treatment and then repeat the treatment at a later date. That suggests that physicians should take a harder look at the limitations of MAT and other treatments, Dr. Gold said.

Although the review found some associations between neurocognitive deficits and opioid overdose, the authors point out that it is difficult to make direct comparisons because of biases and differences in methodology among the included studies. They were not able to reach conclusions about the prevalence of brain injuries following nonfatal opioid overdoses. Few included studies controlled for confounding factors that might contribute to or explain neurocognitive impairments, reported Dr. Winstanley, associate professor in the department of behavioral medicine and psychiatry at the University of West Virginia, Morgantown, and associates.

Still, distinct patterns emerged from the analysis of almost 3,500 subjects in 79 studies in 21 countries. Twenty-nine studies reported diagnoses of leukoencephalopathy, which affects white matter. Spongiform leukoencephalopathy is known to occur secondarily after exposure to a variety of toxic agents, including carbon monoxide poisoning and drugs of abuse. The damage can lead to erosion of higher cerebral function. The condition can occur from 2 to 180 days after a hypoxic brain injury, potentially complicating efforts to attribute it specifically to an opioid overdose. Amnestic syndrome was also reported in some studies. One study found that about 39% of people seeking buprenorphine treatment suffered from neurocognitive impairment.

Dr. Gold called the study’s findings novel and of public health importance. “Each overdose takes a toll on the body, and especially the brain,” he said.
 

Better documentation needed

The variability in symptoms, as well as their timing, present challenges to initial treatment, which often occur before a patient reaches the hospital. This is a vital window because the length of time of inadequate respiration because of opioid overdose is likely to predict the extent of brain injury. The duration of inadequate respiration may not be captured in electronic medical records, and emergency departments don’t typically collect toxicology information, which may lead health care providers to attribute neurocognitive impairments to ongoing drug use rather than an acute anoxic or hypoxic episode. Further neurocognitive damage may have a delayed onset, and better documentation of these events could help physicians determine whether those symptoms stem from the acute event.

Dr. Winstanley and associates called for more research, including prospective case-control studies to identify brain changes following opioid-related overdose.

The authors also suggested that physicians might want to consider screening patients who experience prolonged anoxia or hypoxia for neurocognitive impairments and brain injuries. Dr. Gold agreed.

“Clinicians working with OUD patients should take these data to heart and take a comprehensive history of previous overdoses, loss of consciousness, head trauma, and following up on the history with neuropsychological and other tests of brain function,” Dr. Gold said. “After an assessment, rehabilitation and treatment might then be more personalized and effective.”

Dr. Gold had no relevant financial disclosures.