Mixed Topics

A new study adds to what has been emerging in the literature — namely that there appear to be gut microbiome “signatures” for various pain conditions — suggesting that microbiome-based diagnostics and therapeutics may one day be routine for a broad range of pain conditions.

“There is now a whole list of pain conditions that appear to have these signatures, including postoperative pain, arthritis, neuropathy and migraine to name a few,” Robert Bonakdar, MD, director of pain management, Scripps Center for Integrative Medicine, San Diego, told GI & Hepatology News.

Fibromyalgia and complex regional pain syndrome (CRPS) are also on the list.

A team led by Amir Minerbi, MD, PhD, director of the Institute for Pain Medicine, Haifa, Israel, and colleagues published one of the first articles on gut changes in fibromyalgia. They noted that the gut microbiome could be utilized to determine which individuals had the condition and which did not — with about a 90% accuracy.

The team went on to show that transplanting gut microbiota from patients with fibromyalgia into germ-free mice was sufficient to induce pain-like behaviors in the animals — “effects that were reversed when healthy human microbiota were transplanted instead,” Minerbi told GI & Hepatology News.

Further, in a pilot clinical study, the researchers showed that transplanting microbiota from healthy donors led to a reduction in pain and other symptoms in women with treatment-resistant fibromyalgia.

Most recently, they found significant differences in the composition of the gut microbiome in a cohort of patients with CRPS from Israel, compared to matched pain-free control individuals.

Notably, two species — Dialister succinatiphilus and Phascolarctobacterium faecium – were enriched in patients with CRPS, while three species — Ligilactobacillus salivarius, Bifidobacterium dentium, and Bifidobacterium adolescentis – were increased in control samples, according to their report published last month in Anesthesiology.

“Importantly,” these findings were replicated in an independent cohort of patients with CRPS from Canada, “suggesting that the observed microbiome signature is robust and consistent across different environments,” Minerbi told GI & Hepatology News.

 

Causal Role? 

“These findings collectively suggest a causal role for the gut microbiome in at least some chronic pain conditions,” Minerbi said.

However, the co-authors of a linked editorial cautioned that it’s “unclear if D succinatiphilus or P faecium are functionally relevant to CRPS pathophysiology or if the bacteria increased in healthy control samples protect against CRPS development.”

Minerbi and colleagues also observed that fecal concentrations of all measured short chain fatty acids (SCFA) in patients with CRPS were lower on average compared to pain-free control individuals, of which butyric, hexanoic, and valeric acid showed significant depletion.

Additionally, plasma concentrations of acetic acid showed significant depletion in patients with CRPS vs control individuals, while propionate, butyrate, isobutyrate and 2-methyl-butyric acid showed a trend toward lower concentrations.

The quantification of SCFA in patient stool and serum is a “notable advance” in this study, Zulmary Manjarres, PhD; Ashley Plumb, PhD; and Katelyn Sadler, PhD; with the Center for Advanced Pain Studies at The University of Texas at Dallas, wrote in their editorial.

SCFA are produced by bacteria as a byproduct of dietary fiber fermentation and appropriate levels of these compounds are important to maintain low levels of inflammation in the colon and overall gut health, they explained.

This begs the question of whether administering probiotic bacteria — many of which are believed to exert health benefits through SCFA production — can be used to treat CRPS-associated pain. It’s something that needs to be studied, the editorialists wrote.

Yet, in their view, the “most notable achievement” of Minerbi and colleagues is the development of a machine learning model that accurately, specifically and sensitively categorized individuals as patients with CRPS or control individuals based on their fecal microbiome signature.

The model, trained on exact sequence variant data from the Israeli patients, achieved 89.5% accuracy, 90.0% sensitivity, and 88.9% specificity in distinguishing patients with CRPS from control individuals in the Canadian cohort.

Interestingly, in three patients with CRPS who underwent limb amputation and recovered from their pain, their gut microbiome signature remained unchanged, suggesting that microbiome alterations might precede or persist beyond symptomatic phases.

 

Test and Treat: Are We There Yet? 

The gut microbiome link to chronic pain syndromes is a hot area of research, but for now gut microbial testing followed by treatment aimed at “fixing” the microbiome remains largely experimental.

At this point, comprehensive gut-microbiome sequencing is not a routine, guideline-supported part of care for fibromyalgia or any chronic pain condition.

“Unfortunately, even for doctors interested in this area, we are not quite at the state of being able to diagnose and treat pain syndrome based on microbiome data,” Bonakdar told GI & Hepatology News.

He said there are many reasons for this including that this type of microbiome analysis is not commonly available at a routine lab. If patients do obtain testing, then the results are quite complex and may not translate to a diagnosis or a simple microbiome intervention.

“I think the closest option we have now is considering supplementing with commonly beneficial probiotic in pain conditions,” Bonakdar said.

One example is a preliminary fibromyalgia trial which found that supplementing with Lactobacillus, Bifidobacterium, and Saccharomyces boulardii appeared to have benefit.

“Unfortunately, this is hit or miss as other trials such as one in low back pain did not find benefit,” Bonakdar said.

Addressing gut microbiome changes will become “more actionable when microbiome analysis is more commonplace as well as is the ability to tailor treatment to the abnormalities seen on testing in a real-world manner,” Bonakdar said.

“Until then, there is no harm in promoting an anti-inflammatory diet for our patients with pain which we know can improve components of the microbiome while also supporting pain management,” he concluded.

Minerbi, Bonakdar, and the editorial writers had no relevant disclosures.

A version of this article appeared on Medscape.com.

A new study adds to what has been emerging in the literature — namely that there appear to be gut microbiome “signatures” for various pain conditions — suggesting that microbiome-based diagnostics and therapeutics may one day be routine for a broad range of pain conditions.

“There is now a whole list of pain conditions that appear to have these signatures, including postoperative pain, arthritis, neuropathy and migraine to name a few,” Robert Bonakdar, MD, director of pain management, Scripps Center for Integrative Medicine, San Diego, told GI & Hepatology News.

Fibromyalgia and complex regional pain syndrome (CRPS) are also on the list.

A team led by Amir Minerbi, MD, PhD, director of the Institute for Pain Medicine, Haifa, Israel, and colleagues published one of the first articles on gut changes in fibromyalgia. They noted that the gut microbiome could be utilized to determine which individuals had the condition and which did not — with about a 90% accuracy.

The team went on to show that transplanting gut microbiota from patients with fibromyalgia into germ-free mice was sufficient to induce pain-like behaviors in the animals — “effects that were reversed when healthy human microbiota were transplanted instead,” Minerbi told GI & Hepatology News.

Further, in a pilot clinical study, the researchers showed that transplanting microbiota from healthy donors led to a reduction in pain and other symptoms in women with treatment-resistant fibromyalgia.

Most recently, they found significant differences in the composition of the gut microbiome in a cohort of patients with CRPS from Israel, compared to matched pain-free control individuals.

Notably, two species — Dialister succinatiphilus and Phascolarctobacterium faecium – were enriched in patients with CRPS, while three species — Ligilactobacillus salivarius, Bifidobacterium dentium, and Bifidobacterium adolescentis – were increased in control samples, according to their report published last month in Anesthesiology.

“Importantly,” these findings were replicated in an independent cohort of patients with CRPS from Canada, “suggesting that the observed microbiome signature is robust and consistent across different environments,” Minerbi told GI & Hepatology News.

 

Causal Role? 

“These findings collectively suggest a causal role for the gut microbiome in at least some chronic pain conditions,” Minerbi said.

However, the co-authors of a linked editorial cautioned that it’s “unclear if D succinatiphilus or P faecium are functionally relevant to CRPS pathophysiology or if the bacteria increased in healthy control samples protect against CRPS development.”

Minerbi and colleagues also observed that fecal concentrations of all measured short chain fatty acids (SCFA) in patients with CRPS were lower on average compared to pain-free control individuals, of which butyric, hexanoic, and valeric acid showed significant depletion.

Additionally, plasma concentrations of acetic acid showed significant depletion in patients with CRPS vs control individuals, while propionate, butyrate, isobutyrate and 2-methyl-butyric acid showed a trend toward lower concentrations.

The quantification of SCFA in patient stool and serum is a “notable advance” in this study, Zulmary Manjarres, PhD; Ashley Plumb, PhD; and Katelyn Sadler, PhD; with the Center for Advanced Pain Studies at The University of Texas at Dallas, wrote in their editorial.

SCFA are produced by bacteria as a byproduct of dietary fiber fermentation and appropriate levels of these compounds are important to maintain low levels of inflammation in the colon and overall gut health, they explained.

This begs the question of whether administering probiotic bacteria — many of which are believed to exert health benefits through SCFA production — can be used to treat CRPS-associated pain. It’s something that needs to be studied, the editorialists wrote.

Yet, in their view, the “most notable achievement” of Minerbi and colleagues is the development of a machine learning model that accurately, specifically and sensitively categorized individuals as patients with CRPS or control individuals based on their fecal microbiome signature.

The model, trained on exact sequence variant data from the Israeli patients, achieved 89.5% accuracy, 90.0% sensitivity, and 88.9% specificity in distinguishing patients with CRPS from control individuals in the Canadian cohort.

Interestingly, in three patients with CRPS who underwent limb amputation and recovered from their pain, their gut microbiome signature remained unchanged, suggesting that microbiome alterations might precede or persist beyond symptomatic phases.

 

Test and Treat: Are We There Yet? 

The gut microbiome link to chronic pain syndromes is a hot area of research, but for now gut microbial testing followed by treatment aimed at “fixing” the microbiome remains largely experimental.

At this point, comprehensive gut-microbiome sequencing is not a routine, guideline-supported part of care for fibromyalgia or any chronic pain condition.

“Unfortunately, even for doctors interested in this area, we are not quite at the state of being able to diagnose and treat pain syndrome based on microbiome data,” Bonakdar told GI & Hepatology News.

He said there are many reasons for this including that this type of microbiome analysis is not commonly available at a routine lab. If patients do obtain testing, then the results are quite complex and may not translate to a diagnosis or a simple microbiome intervention.

“I think the closest option we have now is considering supplementing with commonly beneficial probiotic in pain conditions,” Bonakdar said.

One example is a preliminary fibromyalgia trial which found that supplementing with Lactobacillus, Bifidobacterium, and Saccharomyces boulardii appeared to have benefit.

“Unfortunately, this is hit or miss as other trials such as one in low back pain did not find benefit,” Bonakdar said.

Addressing gut microbiome changes will become “more actionable when microbiome analysis is more commonplace as well as is the ability to tailor treatment to the abnormalities seen on testing in a real-world manner,” Bonakdar said.

“Until then, there is no harm in promoting an anti-inflammatory diet for our patients with pain which we know can improve components of the microbiome while also supporting pain management,” he concluded.

Minerbi, Bonakdar, and the editorial writers had no relevant disclosures.

A version of this article appeared on Medscape.com.

A new study adds to what has been emerging in the literature — namely that there appear to be gut microbiome “signatures” for various pain conditions — suggesting that microbiome-based diagnostics and therapeutics may one day be routine for a broad range of pain conditions.

“There is now a whole list of pain conditions that appear to have these signatures, including postoperative pain, arthritis, neuropathy and migraine to name a few,” Robert Bonakdar, MD, director of pain management, Scripps Center for Integrative Medicine, San Diego, told GI & Hepatology News.

Fibromyalgia and complex regional pain syndrome (CRPS) are also on the list.

A team led by Amir Minerbi, MD, PhD, director of the Institute for Pain Medicine, Haifa, Israel, and colleagues published one of the first articles on gut changes in fibromyalgia. They noted that the gut microbiome could be utilized to determine which individuals had the condition and which did not — with about a 90% accuracy.

The team went on to show that transplanting gut microbiota from patients with fibromyalgia into germ-free mice was sufficient to induce pain-like behaviors in the animals — “effects that were reversed when healthy human microbiota were transplanted instead,” Minerbi told GI & Hepatology News.

Further, in a pilot clinical study, the researchers showed that transplanting microbiota from healthy donors led to a reduction in pain and other symptoms in women with treatment-resistant fibromyalgia.

Most recently, they found significant differences in the composition of the gut microbiome in a cohort of patients with CRPS from Israel, compared to matched pain-free control individuals.

Notably, two species — Dialister succinatiphilus and Phascolarctobacterium faecium – were enriched in patients with CRPS, while three species — Ligilactobacillus salivarius, Bifidobacterium dentium, and Bifidobacterium adolescentis – were increased in control samples, according to their report published last month in Anesthesiology.

“Importantly,” these findings were replicated in an independent cohort of patients with CRPS from Canada, “suggesting that the observed microbiome signature is robust and consistent across different environments,” Minerbi told GI & Hepatology News.

 

Causal Role? 

“These findings collectively suggest a causal role for the gut microbiome in at least some chronic pain conditions,” Minerbi said.

However, the co-authors of a linked editorial cautioned that it’s “unclear if D succinatiphilus or P faecium are functionally relevant to CRPS pathophysiology or if the bacteria increased in healthy control samples protect against CRPS development.”

Minerbi and colleagues also observed that fecal concentrations of all measured short chain fatty acids (SCFA) in patients with CRPS were lower on average compared to pain-free control individuals, of which butyric, hexanoic, and valeric acid showed significant depletion.

Additionally, plasma concentrations of acetic acid showed significant depletion in patients with CRPS vs control individuals, while propionate, butyrate, isobutyrate and 2-methyl-butyric acid showed a trend toward lower concentrations.

The quantification of SCFA in patient stool and serum is a “notable advance” in this study, Zulmary Manjarres, PhD; Ashley Plumb, PhD; and Katelyn Sadler, PhD; with the Center for Advanced Pain Studies at The University of Texas at Dallas, wrote in their editorial.

SCFA are produced by bacteria as a byproduct of dietary fiber fermentation and appropriate levels of these compounds are important to maintain low levels of inflammation in the colon and overall gut health, they explained.

This begs the question of whether administering probiotic bacteria — many of which are believed to exert health benefits through SCFA production — can be used to treat CRPS-associated pain. It’s something that needs to be studied, the editorialists wrote.

Yet, in their view, the “most notable achievement” of Minerbi and colleagues is the development of a machine learning model that accurately, specifically and sensitively categorized individuals as patients with CRPS or control individuals based on their fecal microbiome signature.

The model, trained on exact sequence variant data from the Israeli patients, achieved 89.5% accuracy, 90.0% sensitivity, and 88.9% specificity in distinguishing patients with CRPS from control individuals in the Canadian cohort.

Interestingly, in three patients with CRPS who underwent limb amputation and recovered from their pain, their gut microbiome signature remained unchanged, suggesting that microbiome alterations might precede or persist beyond symptomatic phases.

 

Test and Treat: Are We There Yet? 

The gut microbiome link to chronic pain syndromes is a hot area of research, but for now gut microbial testing followed by treatment aimed at “fixing” the microbiome remains largely experimental.

At this point, comprehensive gut-microbiome sequencing is not a routine, guideline-supported part of care for fibromyalgia or any chronic pain condition.

“Unfortunately, even for doctors interested in this area, we are not quite at the state of being able to diagnose and treat pain syndrome based on microbiome data,” Bonakdar told GI & Hepatology News.

He said there are many reasons for this including that this type of microbiome analysis is not commonly available at a routine lab. If patients do obtain testing, then the results are quite complex and may not translate to a diagnosis or a simple microbiome intervention.

“I think the closest option we have now is considering supplementing with commonly beneficial probiotic in pain conditions,” Bonakdar said.

One example is a preliminary fibromyalgia trial which found that supplementing with Lactobacillus, Bifidobacterium, and Saccharomyces boulardii appeared to have benefit.

“Unfortunately, this is hit or miss as other trials such as one in low back pain did not find benefit,” Bonakdar said.

Addressing gut microbiome changes will become “more actionable when microbiome analysis is more commonplace as well as is the ability to tailor treatment to the abnormalities seen on testing in a real-world manner,” Bonakdar said.

“Until then, there is no harm in promoting an anti-inflammatory diet for our patients with pain which we know can improve components of the microbiome while also supporting pain management,” he concluded.

Minerbi, Bonakdar, and the editorial writers had no relevant disclosures.

A version of this article appeared on Medscape.com.

Dear Friends,

Like many readers, I just returned from Digestive Disease Week® (DDW) in San Diego, California. For the first time in my early career, my experience was not just overwhelming and exhausting. Before, I wanted to do everything – lectures, posters, meetings with friends, prospective research collaborators, and more! This year, I acknowledged that instead of spreading myself thin and not fully engaging, I made a focused daily schedule mixed with productivity and social events, selecting only what was most important to me at this time in my career. This time, after DDW, instead of giving in to my inner introvert and holing myself in my house for a week to recover, I am invigorated by what I learned and the people I met. I can’t wait to see what’s to come next year!

In this issue’s “In Focus”, Dr. Evan Dellon describes his diagnostic approach, including a clear history, endoscopic evaluation with biopsy, and ruling out other causes of esophageal eosinophilia. He emphasizes that treatment should target both inflammation and fibrostenosis and reviews the guidelines and evidence behind first-line treatments, surveillance, and long-term maintenance.

In the second of a two-part series in the “Short Clinical Review” section, Dr. Christopher Vélez, Dr. Rosa L. Yu, and Dr. Jennifer Dimino discuss care for patients with disorders of brain-gut interaction from historically marginalized communities. They highlight ways to improve care for these patients in day-to-day clinical practice.

The transition from trainee to a practicing gastroenterologist may bring with it responsibilities of giving feedback to trainees and/or colleagues to improve. In the “Early Career” section, Dr. Michelle Baliss and Dr. Christine Hachem give practical tips on how best to deliver feedback, with a focus on creating time, building rapport, bidirectional communication, and more.

Lastly, in the “Finance/Legal” section, John S. Gardner, a financial advisor, guides trainees and early career gastroenterologists through estate planning – why it’s important, how to do it effectively, and long-term benefits to starting early.

If you are interested in contributing or have ideas for future TNG topics, please contact me ([email protected]) or Danielle Kiefer ([email protected]), Communications/Managing Editor of TNG.

Until next time, I leave you with a historical fun fact because we would not be where we are now without appreciating where we were: the first case of eosinophilic esophagitis was only first described in 1978 and became a distinct entity in the early 1990s.

Yours truly, 

Judy A. Trieu, MD, MPH

Editor-in-Chief

Assistant Professor of Medicine

Interventional Endoscopy, Division of Gastroenterology

Washington University School of Medicine in St. Louis

Dear Friends,

Like many readers, I just returned from Digestive Disease Week® (DDW) in San Diego, California. For the first time in my early career, my experience was not just overwhelming and exhausting. Before, I wanted to do everything – lectures, posters, meetings with friends, prospective research collaborators, and more! This year, I acknowledged that instead of spreading myself thin and not fully engaging, I made a focused daily schedule mixed with productivity and social events, selecting only what was most important to me at this time in my career. This time, after DDW, instead of giving in to my inner introvert and holing myself in my house for a week to recover, I am invigorated by what I learned and the people I met. I can’t wait to see what’s to come next year!

In this issue’s “In Focus”, Dr. Evan Dellon describes his diagnostic approach, including a clear history, endoscopic evaluation with biopsy, and ruling out other causes of esophageal eosinophilia. He emphasizes that treatment should target both inflammation and fibrostenosis and reviews the guidelines and evidence behind first-line treatments, surveillance, and long-term maintenance.

In the second of a two-part series in the “Short Clinical Review” section, Dr. Christopher Vélez, Dr. Rosa L. Yu, and Dr. Jennifer Dimino discuss care for patients with disorders of brain-gut interaction from historically marginalized communities. They highlight ways to improve care for these patients in day-to-day clinical practice.

The transition from trainee to a practicing gastroenterologist may bring with it responsibilities of giving feedback to trainees and/or colleagues to improve. In the “Early Career” section, Dr. Michelle Baliss and Dr. Christine Hachem give practical tips on how best to deliver feedback, with a focus on creating time, building rapport, bidirectional communication, and more.

Lastly, in the “Finance/Legal” section, John S. Gardner, a financial advisor, guides trainees and early career gastroenterologists through estate planning – why it’s important, how to do it effectively, and long-term benefits to starting early.

If you are interested in contributing or have ideas for future TNG topics, please contact me ([email protected]) or Danielle Kiefer ([email protected]), Communications/Managing Editor of TNG.

Until next time, I leave you with a historical fun fact because we would not be where we are now without appreciating where we were: the first case of eosinophilic esophagitis was only first described in 1978 and became a distinct entity in the early 1990s.

Yours truly, 

Judy A. Trieu, MD, MPH

Editor-in-Chief

Assistant Professor of Medicine

Interventional Endoscopy, Division of Gastroenterology

Washington University School of Medicine in St. Louis

Dear Friends,

Like many readers, I just returned from Digestive Disease Week® (DDW) in San Diego, California. For the first time in my early career, my experience was not just overwhelming and exhausting. Before, I wanted to do everything – lectures, posters, meetings with friends, prospective research collaborators, and more! This year, I acknowledged that instead of spreading myself thin and not fully engaging, I made a focused daily schedule mixed with productivity and social events, selecting only what was most important to me at this time in my career. This time, after DDW, instead of giving in to my inner introvert and holing myself in my house for a week to recover, I am invigorated by what I learned and the people I met. I can’t wait to see what’s to come next year!

In this issue’s “In Focus”, Dr. Evan Dellon describes his diagnostic approach, including a clear history, endoscopic evaluation with biopsy, and ruling out other causes of esophageal eosinophilia. He emphasizes that treatment should target both inflammation and fibrostenosis and reviews the guidelines and evidence behind first-line treatments, surveillance, and long-term maintenance.

In the second of a two-part series in the “Short Clinical Review” section, Dr. Christopher Vélez, Dr. Rosa L. Yu, and Dr. Jennifer Dimino discuss care for patients with disorders of brain-gut interaction from historically marginalized communities. They highlight ways to improve care for these patients in day-to-day clinical practice.

The transition from trainee to a practicing gastroenterologist may bring with it responsibilities of giving feedback to trainees and/or colleagues to improve. In the “Early Career” section, Dr. Michelle Baliss and Dr. Christine Hachem give practical tips on how best to deliver feedback, with a focus on creating time, building rapport, bidirectional communication, and more.

Lastly, in the “Finance/Legal” section, John S. Gardner, a financial advisor, guides trainees and early career gastroenterologists through estate planning – why it’s important, how to do it effectively, and long-term benefits to starting early.

If you are interested in contributing or have ideas for future TNG topics, please contact me ([email protected]) or Danielle Kiefer ([email protected]), Communications/Managing Editor of TNG.

Until next time, I leave you with a historical fun fact because we would not be where we are now without appreciating where we were: the first case of eosinophilic esophagitis was only first described in 1978 and became a distinct entity in the early 1990s.

Yours truly, 

Judy A. Trieu, MD, MPH

Editor-in-Chief

Assistant Professor of Medicine

Interventional Endoscopy, Division of Gastroenterology

Washington University School of Medicine in St. Louis

TOPLINE:

Posttraumatic stress disorder (PTSD) among veterans living with HIV significantly increased the risk for AIDS and multiple comorbidities, particularly arthritis, cardiovascular disease (CVD), chronic obstructive pulmonary disease (COPD), chronic kidney disease (CKD), and multimorbidity — with the greatest impact seen in the first decade after diagnosis.

METHODOLOGY:

• Researchers conducted a prospective cohort study to assess whether PTSD is associated with increased risk for adverse clinical outcomes in veterans with HIV who received care at the Department of Veterans Affairs.
• They included 3206 veterans (97.4% men; median age at HIV diagnosis, 31.7 years; 42.1% with PTSD) who were deployed in Iraq and Afghanistan while serving in the military and initiated antiretroviral therapy before December 31, 2020.
• Participants were followed-up until December 2022, with censoring at death, the last health care visit, or study termination. The association between PTSD with morbidity and mortality, considering the number of deployments and levels of combat exposure were determined.

TAKEAWAY:

• PTSD significantly increased the overall risks for AIDS by 11% (adjusted hazard ratio [aHR], 1.11), CKD by 21% (aHR, 1.21), COPD by 46% (aHR, 1.46), multimorbidity by 49% (aHR, 1.49), CVD by 57% (aHR, 1.57), and arthritis by two folds (aHR, 1.95; P <.05 for all).
• Among veterans with a single deployment, those with PTSD had 92%, 87%, 80%, 53%, 44%, 32%, and 27% higher risks for asthma, CVD, arthritis, multimorbidity, COPD, liver disease, and AIDS, respectively, than those without PTSD.
• Veterans with PTSD and combat exposure had a lower risk for AIDS but higher risks for multimorbidity, asthma, CVD, and arthritis than those never diagnosed with PTSD and unexposed to combat.
• The associations of PTSD with mortality and morbidity appeared most pronounced in the first decade post-diagnosis, followed by a gradual decline in association strength; however, risks remained elevated.

IN PRACTICE:

“It is recommended that providers who work with VWH [veterans with HIV] consider adopting a trauma-informed model of HIV care and that providers screen veterans for PTSD, so that their unique trauma history can help guide medical decisions and treatment,” the authors wrote.

SOURCE:

This study was led by Kartavya J. Vyas, PhD, Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta. It was published online in AIDS .

LIMITATIONS:

The data could not capture each individual’s true index trauma or the severity of their PTSD. Additionally, the study was limited by considerable loss to follow-up, potential uncontrolled confounding related to homelessness, and a lack of generalizability to veterans with HIV who were not receiving antiretroviral therapy.

DISCLOSURES:

The study did not receive any specific funding. Two authors reported receiving federal research support — one from the Emory Center for AIDS Research and the National Institute of Allergy and Infectious Diseases, and the other from the National Institutes of Health and the CDC — in addition to investigator-initiated grants and consulting fees from various pharmaceutical companies.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article first appeared on Medscape.com.

TOPLINE:

Posttraumatic stress disorder (PTSD) among veterans living with HIV significantly increased the risk for AIDS and multiple comorbidities, particularly arthritis, cardiovascular disease (CVD), chronic obstructive pulmonary disease (COPD), chronic kidney disease (CKD), and multimorbidity — with the greatest impact seen in the first decade after diagnosis.

METHODOLOGY:

• Researchers conducted a prospective cohort study to assess whether PTSD is associated with increased risk for adverse clinical outcomes in veterans with HIV who received care at the Department of Veterans Affairs.
• They included 3206 veterans (97.4% men; median age at HIV diagnosis, 31.7 years; 42.1% with PTSD) who were deployed in Iraq and Afghanistan while serving in the military and initiated antiretroviral therapy before December 31, 2020.
• Participants were followed-up until December 2022, with censoring at death, the last health care visit, or study termination. The association between PTSD with morbidity and mortality, considering the number of deployments and levels of combat exposure were determined.

TAKEAWAY:

• PTSD significantly increased the overall risks for AIDS by 11% (adjusted hazard ratio [aHR], 1.11), CKD by 21% (aHR, 1.21), COPD by 46% (aHR, 1.46), multimorbidity by 49% (aHR, 1.49), CVD by 57% (aHR, 1.57), and arthritis by two folds (aHR, 1.95; P <.05 for all).
• Among veterans with a single deployment, those with PTSD had 92%, 87%, 80%, 53%, 44%, 32%, and 27% higher risks for asthma, CVD, arthritis, multimorbidity, COPD, liver disease, and AIDS, respectively, than those without PTSD.
• Veterans with PTSD and combat exposure had a lower risk for AIDS but higher risks for multimorbidity, asthma, CVD, and arthritis than those never diagnosed with PTSD and unexposed to combat.
• The associations of PTSD with mortality and morbidity appeared most pronounced in the first decade post-diagnosis, followed by a gradual decline in association strength; however, risks remained elevated.

IN PRACTICE:

“It is recommended that providers who work with VWH [veterans with HIV] consider adopting a trauma-informed model of HIV care and that providers screen veterans for PTSD, so that their unique trauma history can help guide medical decisions and treatment,” the authors wrote.

SOURCE:

This study was led by Kartavya J. Vyas, PhD, Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta. It was published online in AIDS .

LIMITATIONS:

The data could not capture each individual’s true index trauma or the severity of their PTSD. Additionally, the study was limited by considerable loss to follow-up, potential uncontrolled confounding related to homelessness, and a lack of generalizability to veterans with HIV who were not receiving antiretroviral therapy.

DISCLOSURES:

The study did not receive any specific funding. Two authors reported receiving federal research support — one from the Emory Center for AIDS Research and the National Institute of Allergy and Infectious Diseases, and the other from the National Institutes of Health and the CDC — in addition to investigator-initiated grants and consulting fees from various pharmaceutical companies.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article first appeared on Medscape.com.

TOPLINE:

Posttraumatic stress disorder (PTSD) among veterans living with HIV significantly increased the risk for AIDS and multiple comorbidities, particularly arthritis, cardiovascular disease (CVD), chronic obstructive pulmonary disease (COPD), chronic kidney disease (CKD), and multimorbidity — with the greatest impact seen in the first decade after diagnosis.

METHODOLOGY:

• Researchers conducted a prospective cohort study to assess whether PTSD is associated with increased risk for adverse clinical outcomes in veterans with HIV who received care at the Department of Veterans Affairs.
• They included 3206 veterans (97.4% men; median age at HIV diagnosis, 31.7 years; 42.1% with PTSD) who were deployed in Iraq and Afghanistan while serving in the military and initiated antiretroviral therapy before December 31, 2020.
• Participants were followed-up until December 2022, with censoring at death, the last health care visit, or study termination. The association between PTSD with morbidity and mortality, considering the number of deployments and levels of combat exposure were determined.

TAKEAWAY:

• PTSD significantly increased the overall risks for AIDS by 11% (adjusted hazard ratio [aHR], 1.11), CKD by 21% (aHR, 1.21), COPD by 46% (aHR, 1.46), multimorbidity by 49% (aHR, 1.49), CVD by 57% (aHR, 1.57), and arthritis by two folds (aHR, 1.95; P <.05 for all).
• Among veterans with a single deployment, those with PTSD had 92%, 87%, 80%, 53%, 44%, 32%, and 27% higher risks for asthma, CVD, arthritis, multimorbidity, COPD, liver disease, and AIDS, respectively, than those without PTSD.
• Veterans with PTSD and combat exposure had a lower risk for AIDS but higher risks for multimorbidity, asthma, CVD, and arthritis than those never diagnosed with PTSD and unexposed to combat.
• The associations of PTSD with mortality and morbidity appeared most pronounced in the first decade post-diagnosis, followed by a gradual decline in association strength; however, risks remained elevated.

IN PRACTICE:

“It is recommended that providers who work with VWH [veterans with HIV] consider adopting a trauma-informed model of HIV care and that providers screen veterans for PTSD, so that their unique trauma history can help guide medical decisions and treatment,” the authors wrote.

SOURCE:

This study was led by Kartavya J. Vyas, PhD, Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta. It was published online in AIDS .

LIMITATIONS:

The data could not capture each individual’s true index trauma or the severity of their PTSD. Additionally, the study was limited by considerable loss to follow-up, potential uncontrolled confounding related to homelessness, and a lack of generalizability to veterans with HIV who were not receiving antiretroviral therapy.

DISCLOSURES:

The study did not receive any specific funding. Two authors reported receiving federal research support — one from the Emory Center for AIDS Research and the National Institute of Allergy and Infectious Diseases, and the other from the National Institutes of Health and the CDC — in addition to investigator-initiated grants and consulting fees from various pharmaceutical companies.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article first appeared on Medscape.com.

Demand for specialized GI care has skyrocketed in recent years, eclipsing the supply of gastroenterologists and impairing patient access to high-quality GI care, particularly in rural and other underserved areas. In this environment, advanced practice providers (APPs), including nurse practitioners (NPs) and physician assistants (PAs), have become increasingly vital clinical partners to gastroenterologists in optimizing patient access, improving health outcomes, and ensuring continuity of care.

Across specialties, APPs are estimated to constitute roughly a third of the US clinical workforce, and demand is only growing. A June 2024 MGMA Stat poll found that 63% of medical groups planned to add new APP roles in the next year. As the GI APP workforce grows, so too will demand for advanced training tailored to the APP role.

AGA has invested heavily in professional development opportunities for NPs and PAs, in recognition of their vital role in providing high-quality GI care. The newly formed AGA NPPA Task Force, co-chaired by Abigail Meyers (who we featured in GIHN’s April issue) and Kimberly Kearns, works closely with the Education and Training Committee to develop education programs to meet the specific needs of NPs and PAs, and advocate for more APP involvement in AGA programming. One example of this is AGA’s 2025 Principles of GI for the NP and PA course, which will be held in Chicago in early August – I encourage you to spread the word and support your APP colleagues in getting involved in these important initiatives as our vital partners in GI care delivery.

In this month’s issue of GIHN, we present the exciting results of the BOSS trial, showing no survival difference between regular and at need surveillance for Barrett’s esophagus, suggesting that at need endoscopy may be a safe alternative for low-risk patients. Continuing our coverage of potentially practice-changing research from DDW, we highlight another recent RCT challenging the use of papillary sphincterotomy as a treatment for pancreas divisum.

In our July Member Spotlight, Eric Shah, MD, MBA (University of Michigan), a past AGA Research Scholar Award recipient, highlights how this critical research support aided him in his journey to develop a now FDA-approved point-of care screening tool used to evaluate patients with chronic constipation for pelvic floor dysfunction during a routine clinic visit. In our quarterly Perspectives column, Dr. David Wan (a GI hospitalist) and Dr. Zeyed Metwalli (an interventional radiologist) discuss best practices in management of lower GI bleeding. We hope you have a restful summer!

Megan A. Adams, MD, JD, MSc

Editor in Chief

Demand for specialized GI care has skyrocketed in recent years, eclipsing the supply of gastroenterologists and impairing patient access to high-quality GI care, particularly in rural and other underserved areas. In this environment, advanced practice providers (APPs), including nurse practitioners (NPs) and physician assistants (PAs), have become increasingly vital clinical partners to gastroenterologists in optimizing patient access, improving health outcomes, and ensuring continuity of care.

Across specialties, APPs are estimated to constitute roughly a third of the US clinical workforce, and demand is only growing. A June 2024 MGMA Stat poll found that 63% of medical groups planned to add new APP roles in the next year. As the GI APP workforce grows, so too will demand for advanced training tailored to the APP role.

AGA has invested heavily in professional development opportunities for NPs and PAs, in recognition of their vital role in providing high-quality GI care. The newly formed AGA NPPA Task Force, co-chaired by Abigail Meyers (who we featured in GIHN’s April issue) and Kimberly Kearns, works closely with the Education and Training Committee to develop education programs to meet the specific needs of NPs and PAs, and advocate for more APP involvement in AGA programming. One example of this is AGA’s 2025 Principles of GI for the NP and PA course, which will be held in Chicago in early August – I encourage you to spread the word and support your APP colleagues in getting involved in these important initiatives as our vital partners in GI care delivery.

In this month’s issue of GIHN, we present the exciting results of the BOSS trial, showing no survival difference between regular and at need surveillance for Barrett’s esophagus, suggesting that at need endoscopy may be a safe alternative for low-risk patients. Continuing our coverage of potentially practice-changing research from DDW, we highlight another recent RCT challenging the use of papillary sphincterotomy as a treatment for pancreas divisum.

In our July Member Spotlight, Eric Shah, MD, MBA (University of Michigan), a past AGA Research Scholar Award recipient, highlights how this critical research support aided him in his journey to develop a now FDA-approved point-of care screening tool used to evaluate patients with chronic constipation for pelvic floor dysfunction during a routine clinic visit. In our quarterly Perspectives column, Dr. David Wan (a GI hospitalist) and Dr. Zeyed Metwalli (an interventional radiologist) discuss best practices in management of lower GI bleeding. We hope you have a restful summer!

Megan A. Adams, MD, JD, MSc

Editor in Chief

Demand for specialized GI care has skyrocketed in recent years, eclipsing the supply of gastroenterologists and impairing patient access to high-quality GI care, particularly in rural and other underserved areas. In this environment, advanced practice providers (APPs), including nurse practitioners (NPs) and physician assistants (PAs), have become increasingly vital clinical partners to gastroenterologists in optimizing patient access, improving health outcomes, and ensuring continuity of care.

Across specialties, APPs are estimated to constitute roughly a third of the US clinical workforce, and demand is only growing. A June 2024 MGMA Stat poll found that 63% of medical groups planned to add new APP roles in the next year. As the GI APP workforce grows, so too will demand for advanced training tailored to the APP role.

AGA has invested heavily in professional development opportunities for NPs and PAs, in recognition of their vital role in providing high-quality GI care. The newly formed AGA NPPA Task Force, co-chaired by Abigail Meyers (who we featured in GIHN’s April issue) and Kimberly Kearns, works closely with the Education and Training Committee to develop education programs to meet the specific needs of NPs and PAs, and advocate for more APP involvement in AGA programming. One example of this is AGA’s 2025 Principles of GI for the NP and PA course, which will be held in Chicago in early August – I encourage you to spread the word and support your APP colleagues in getting involved in these important initiatives as our vital partners in GI care delivery.

In this month’s issue of GIHN, we present the exciting results of the BOSS trial, showing no survival difference between regular and at need surveillance for Barrett’s esophagus, suggesting that at need endoscopy may be a safe alternative for low-risk patients. Continuing our coverage of potentially practice-changing research from DDW, we highlight another recent RCT challenging the use of papillary sphincterotomy as a treatment for pancreas divisum.

In our July Member Spotlight, Eric Shah, MD, MBA (University of Michigan), a past AGA Research Scholar Award recipient, highlights how this critical research support aided him in his journey to develop a now FDA-approved point-of care screening tool used to evaluate patients with chronic constipation for pelvic floor dysfunction during a routine clinic visit. In our quarterly Perspectives column, Dr. David Wan (a GI hospitalist) and Dr. Zeyed Metwalli (an interventional radiologist) discuss best practices in management of lower GI bleeding. We hope you have a restful summer!

Megan A. Adams, MD, JD, MSc

Editor in Chief

Hidradenitis suppurativa (HS) is a chronic scarring inflammatory skin condition of the follicular epithelium that impacts 1% to 4% of the general population (eFigure).^1-3 This statistic likely is an underrepresentation of the affected population due to missed and delayed diagnoses.¹ Hidradenitis suppurativa has been identified as having one of the strongest negative impacts on patients’ lives based on studied skin diseases.⁴ Its recurrent nature can negatively impact both the patient’s physical and mental state.³ Due to the debilitating effects of HS, we aimed to create updated recommendations for empiric antibotics based on affected anatomic locations in an effort to improve patient quality of life.

Methods

An institutional review board–approved retrospective medical chart review of 485 patients diagnosed with HS and evaluated at the University of Texas Medical Branch in Galveston from January 2006 to December 2021 was conducted. Males and females of all ages (including pregnant and pediatric patients) were included. Only patients for whom anatomic locations of HS lesions or culture sites were not documented were excluded from the analysis. Locations of cultures were categorized into 5 groups: axilla; groin; buttocks; inframammary; and multiple sites of involvement, which included any combination of 2 or more sites. Types of bacteria collected from cultures and recorded included Escherichia coli, Enterococcus species, Proteus mirabilis, Pseudomonas aeruginosa, Staphylococcus aureus, coagulase-negative staphylococci (CoNS), and other Gram-negative species. Sensitivity profiles also were analyzed for the most commonly cultured bacteria to create recommendations on antibiotic use based on the anatomic location of the lesions. Data analysis was conducted using descriptive statistics and bivariate analysis.

Results

The analysis included 485 patients comprising 600 visits. Seventy-five percent (363/485) of the study population was female. The axilla was the most common anatomic location for HS lesions followed by multiple sites of involvement. In total, 283 cultures were performed; males were 1.1 times more likely than females to be cultured. While cultures were most frequently obtained in patients with axillary lesions only (93/262 [35%]) or from multiple sites of involvement (83/179 [46%]) as this was the most common presentation of HS in our patient population, cultures were more likely to be obtained when patients presented with only buttock (32/38 [84%]) and inframammary (20/25 [80%]) lesions (Table).

Staphylococcus aureus was the most commonly cultured bacteria in general (53/283 [19%]) as well as for HS located the axilla (24/56 [43%]) and in multiple sites (16/51 [31%]). Proteus mirabilis (29/283 [10%]) was the second most commonly cultured bacteria overall and was cultured most often in the axilla (15/56 [27%]) and inframammary region (6/14 [43%]). These were followed by beta-hemolytic Streptococcus species (26/283 [9%]) and Enterococcus species (21/283 [7%]), which was second to P mirabilis as the most commonly cultured bacteria in the inframammary region (6/14 [43%])(eTable 1).

eTable 2 shows the sensitivity profiles for the most commonly cultured bacteria: S aureus, P mirabilis, and Enterococcus species. Staphylococcus aureus located in the axilla, buttocks, and groin was most sensitive to rifampin (41/44 [93%]), TMP/SMX (41/44 [93%]), and tetracycline (39/44 [89%]) and most resistant to erythromycin (26/44 [59%]) and oxacillin (24/44 [55%]). Proteus mirabilis in the inframammary region was most sensitive to ampicillin (27/27 [100%]), gentamicin (27/27 [100%]), levofloxacin (27/27 [100%]), and TMP/SMX (26/27 [96%]). Enterococcus species were most sensitive to vancomycin (20/20 [100%]) and ampicillin (19/20 [95%]) and most resistant to gentamicin (5/20 [25%]).

Comment

To treat HS, it is important to understand the cause of the condition. Although the pathogenesis of HS has many unknowns, bacterial colonization and biofilms are thought to play a role. Lipopolysaccharides found in the outer membrane of Gram-negative bacteria are pathogen-associated molecular patterns that present to the toll-like receptors of the human immune system. Once the toll-like receptors recognize the pathogen-associated molecular patterns, macrophages and keratinocytes are activated and release proinflammatory and anti-inflammatory cytokines and chemokines. Persistent presentation of bacteria to the immune system increases immune-cell recruitment and worsens chronic inflammation in patients with HS. Evidence has revealed that bacteria initiate and sustain the inflammation seen in patients with HS; therefore, reducing the amount of bacteria could alleviate some of the symptoms of HS.⁵ It is important to continue learning about the pathophysiology of this disease as well as formulating tailored treatments to minimize patient discomfort and improve quality of life.

Based on the findings of the current study and the safety profile of the medication, tetracyclines may be considered for first-line empiric therapy in patients with HS involving the axilla only, buttocks only, or multiple sites. For additional coverage of P mirabilis in the axilla or inframammary region, TMP/SMX monotherapy or tetracycline plus ampicillin may be considered. For inframammary lesions only, empiric treatment with ampicillin or TMP/ SMX is recommended. For HS lesions in the groin area, coverage of Enterococcus species with ampicillin should be considered. Patients with multiple sites of involvement that include the inframammary or groin regions similarly should receive empiric antibiotics that cover both S aureus and Gram-negative bacteria, such as TMP/SMX or tetracycline and ampicillin, respectively; if the multiple sites do not include the inframammary or groin regions, Gram-negative coverage may not be indicated. Based on our findings, standardization of treatment for patients with HS can allow for earlier and potentially more effective treatment.

In a similar study conducted in 2016, bacteria species were isolated from the axilla, groin, and gluteus/perineum in patients with HS.⁵ In that study, the most prominent bacteria in the axilla was CoNS; in the groin, P mirabilis and E coli; and in the gluteus/perineum, E coli and CoNS. These results differed from ours, which found S aureus as the abundant bacteria in these areas. In the 2016 study, the highest rates of resistance were found for penicillin G, erythromycin, clindamycin, and ampicillin.⁵ In contrast, the current study found high sensitivities for clindamycin and ampicillin, but our results support the finding of high resistance for erythromycin. These differences could be accounted for by the lower sample size of patients in the 2016 study: 68 patients were analyzed for sensitivity results, and 171 patients were analyzed for frequency of bacterial species in patients with HS.⁵

Our study is limited by its relatively small sample size. Additionally, all patients were seen at 1 of 2 clinic sites, located in League City and Galveston, Texas, and the data from this geographic area may not be applicable to patients seen in different climates.

Conclusion

Outcomes for patients with HS improve with early intervention; however, HS treatment may be delayed by selection of ineffective antibiotic therapy. Our study provides clinicians with recommendations for empiric antibiotic treatment based on anatomic location of HS lesions and culture sensitivity profiles. Utilizing tailored antibiotic therapy on initial clinical evaluation may increase early disease control and improve morbidity and disease outcomes, thereby increasing patient quality of life.

Hidradenitis suppurativa (HS) is a chronic scarring inflammatory skin condition of the follicular epithelium that impacts 1% to 4% of the general population (eFigure).^1-3 This statistic likely is an underrepresentation of the affected population due to missed and delayed diagnoses.¹ Hidradenitis suppurativa has been identified as having one of the strongest negative impacts on patients’ lives based on studied skin diseases.⁴ Its recurrent nature can negatively impact both the patient’s physical and mental state.³ Due to the debilitating effects of HS, we aimed to create updated recommendations for empiric antibotics based on affected anatomic locations in an effort to improve patient quality of life.

Methods

An institutional review board–approved retrospective medical chart review of 485 patients diagnosed with HS and evaluated at the University of Texas Medical Branch in Galveston from January 2006 to December 2021 was conducted. Males and females of all ages (including pregnant and pediatric patients) were included. Only patients for whom anatomic locations of HS lesions or culture sites were not documented were excluded from the analysis. Locations of cultures were categorized into 5 groups: axilla; groin; buttocks; inframammary; and multiple sites of involvement, which included any combination of 2 or more sites. Types of bacteria collected from cultures and recorded included Escherichia coli, Enterococcus species, Proteus mirabilis, Pseudomonas aeruginosa, Staphylococcus aureus, coagulase-negative staphylococci (CoNS), and other Gram-negative species. Sensitivity profiles also were analyzed for the most commonly cultured bacteria to create recommendations on antibiotic use based on the anatomic location of the lesions. Data analysis was conducted using descriptive statistics and bivariate analysis.

Results

The analysis included 485 patients comprising 600 visits. Seventy-five percent (363/485) of the study population was female. The axilla was the most common anatomic location for HS lesions followed by multiple sites of involvement. In total, 283 cultures were performed; males were 1.1 times more likely than females to be cultured. While cultures were most frequently obtained in patients with axillary lesions only (93/262 [35%]) or from multiple sites of involvement (83/179 [46%]) as this was the most common presentation of HS in our patient population, cultures were more likely to be obtained when patients presented with only buttock (32/38 [84%]) and inframammary (20/25 [80%]) lesions (Table).

Staphylococcus aureus was the most commonly cultured bacteria in general (53/283 [19%]) as well as for HS located the axilla (24/56 [43%]) and in multiple sites (16/51 [31%]). Proteus mirabilis (29/283 [10%]) was the second most commonly cultured bacteria overall and was cultured most often in the axilla (15/56 [27%]) and inframammary region (6/14 [43%]). These were followed by beta-hemolytic Streptococcus species (26/283 [9%]) and Enterococcus species (21/283 [7%]), which was second to P mirabilis as the most commonly cultured bacteria in the inframammary region (6/14 [43%])(eTable 1).

eTable 2 shows the sensitivity profiles for the most commonly cultured bacteria: S aureus, P mirabilis, and Enterococcus species. Staphylococcus aureus located in the axilla, buttocks, and groin was most sensitive to rifampin (41/44 [93%]), TMP/SMX (41/44 [93%]), and tetracycline (39/44 [89%]) and most resistant to erythromycin (26/44 [59%]) and oxacillin (24/44 [55%]). Proteus mirabilis in the inframammary region was most sensitive to ampicillin (27/27 [100%]), gentamicin (27/27 [100%]), levofloxacin (27/27 [100%]), and TMP/SMX (26/27 [96%]). Enterococcus species were most sensitive to vancomycin (20/20 [100%]) and ampicillin (19/20 [95%]) and most resistant to gentamicin (5/20 [25%]).

Comment

To treat HS, it is important to understand the cause of the condition. Although the pathogenesis of HS has many unknowns, bacterial colonization and biofilms are thought to play a role. Lipopolysaccharides found in the outer membrane of Gram-negative bacteria are pathogen-associated molecular patterns that present to the toll-like receptors of the human immune system. Once the toll-like receptors recognize the pathogen-associated molecular patterns, macrophages and keratinocytes are activated and release proinflammatory and anti-inflammatory cytokines and chemokines. Persistent presentation of bacteria to the immune system increases immune-cell recruitment and worsens chronic inflammation in patients with HS. Evidence has revealed that bacteria initiate and sustain the inflammation seen in patients with HS; therefore, reducing the amount of bacteria could alleviate some of the symptoms of HS.⁵ It is important to continue learning about the pathophysiology of this disease as well as formulating tailored treatments to minimize patient discomfort and improve quality of life.

Based on the findings of the current study and the safety profile of the medication, tetracyclines may be considered for first-line empiric therapy in patients with HS involving the axilla only, buttocks only, or multiple sites. For additional coverage of P mirabilis in the axilla or inframammary region, TMP/SMX monotherapy or tetracycline plus ampicillin may be considered. For inframammary lesions only, empiric treatment with ampicillin or TMP/ SMX is recommended. For HS lesions in the groin area, coverage of Enterococcus species with ampicillin should be considered. Patients with multiple sites of involvement that include the inframammary or groin regions similarly should receive empiric antibiotics that cover both S aureus and Gram-negative bacteria, such as TMP/SMX or tetracycline and ampicillin, respectively; if the multiple sites do not include the inframammary or groin regions, Gram-negative coverage may not be indicated. Based on our findings, standardization of treatment for patients with HS can allow for earlier and potentially more effective treatment.

In a similar study conducted in 2016, bacteria species were isolated from the axilla, groin, and gluteus/perineum in patients with HS.⁵ In that study, the most prominent bacteria in the axilla was CoNS; in the groin, P mirabilis and E coli; and in the gluteus/perineum, E coli and CoNS. These results differed from ours, which found S aureus as the abundant bacteria in these areas. In the 2016 study, the highest rates of resistance were found for penicillin G, erythromycin, clindamycin, and ampicillin.⁵ In contrast, the current study found high sensitivities for clindamycin and ampicillin, but our results support the finding of high resistance for erythromycin. These differences could be accounted for by the lower sample size of patients in the 2016 study: 68 patients were analyzed for sensitivity results, and 171 patients were analyzed for frequency of bacterial species in patients with HS.⁵

Our study is limited by its relatively small sample size. Additionally, all patients were seen at 1 of 2 clinic sites, located in League City and Galveston, Texas, and the data from this geographic area may not be applicable to patients seen in different climates.

Conclusion

Outcomes for patients with HS improve with early intervention; however, HS treatment may be delayed by selection of ineffective antibiotic therapy. Our study provides clinicians with recommendations for empiric antibiotic treatment based on anatomic location of HS lesions and culture sensitivity profiles. Utilizing tailored antibiotic therapy on initial clinical evaluation may increase early disease control and improve morbidity and disease outcomes, thereby increasing patient quality of life.

Hidradenitis suppurativa (HS) is a chronic scarring inflammatory skin condition of the follicular epithelium that impacts 1% to 4% of the general population (eFigure).^1-3 This statistic likely is an underrepresentation of the affected population due to missed and delayed diagnoses.¹ Hidradenitis suppurativa has been identified as having one of the strongest negative impacts on patients’ lives based on studied skin diseases.⁴ Its recurrent nature can negatively impact both the patient’s physical and mental state.³ Due to the debilitating effects of HS, we aimed to create updated recommendations for empiric antibotics based on affected anatomic locations in an effort to improve patient quality of life.

Methods

An institutional review board–approved retrospective medical chart review of 485 patients diagnosed with HS and evaluated at the University of Texas Medical Branch in Galveston from January 2006 to December 2021 was conducted. Males and females of all ages (including pregnant and pediatric patients) were included. Only patients for whom anatomic locations of HS lesions or culture sites were not documented were excluded from the analysis. Locations of cultures were categorized into 5 groups: axilla; groin; buttocks; inframammary; and multiple sites of involvement, which included any combination of 2 or more sites. Types of bacteria collected from cultures and recorded included Escherichia coli, Enterococcus species, Proteus mirabilis, Pseudomonas aeruginosa, Staphylococcus aureus, coagulase-negative staphylococci (CoNS), and other Gram-negative species. Sensitivity profiles also were analyzed for the most commonly cultured bacteria to create recommendations on antibiotic use based on the anatomic location of the lesions. Data analysis was conducted using descriptive statistics and bivariate analysis.

Results

The analysis included 485 patients comprising 600 visits. Seventy-five percent (363/485) of the study population was female. The axilla was the most common anatomic location for HS lesions followed by multiple sites of involvement. In total, 283 cultures were performed; males were 1.1 times more likely than females to be cultured. While cultures were most frequently obtained in patients with axillary lesions only (93/262 [35%]) or from multiple sites of involvement (83/179 [46%]) as this was the most common presentation of HS in our patient population, cultures were more likely to be obtained when patients presented with only buttock (32/38 [84%]) and inframammary (20/25 [80%]) lesions (Table).

Staphylococcus aureus was the most commonly cultured bacteria in general (53/283 [19%]) as well as for HS located the axilla (24/56 [43%]) and in multiple sites (16/51 [31%]). Proteus mirabilis (29/283 [10%]) was the second most commonly cultured bacteria overall and was cultured most often in the axilla (15/56 [27%]) and inframammary region (6/14 [43%]). These were followed by beta-hemolytic Streptococcus species (26/283 [9%]) and Enterococcus species (21/283 [7%]), which was second to P mirabilis as the most commonly cultured bacteria in the inframammary region (6/14 [43%])(eTable 1).

eTable 2 shows the sensitivity profiles for the most commonly cultured bacteria: S aureus, P mirabilis, and Enterococcus species. Staphylococcus aureus located in the axilla, buttocks, and groin was most sensitive to rifampin (41/44 [93%]), TMP/SMX (41/44 [93%]), and tetracycline (39/44 [89%]) and most resistant to erythromycin (26/44 [59%]) and oxacillin (24/44 [55%]). Proteus mirabilis in the inframammary region was most sensitive to ampicillin (27/27 [100%]), gentamicin (27/27 [100%]), levofloxacin (27/27 [100%]), and TMP/SMX (26/27 [96%]). Enterococcus species were most sensitive to vancomycin (20/20 [100%]) and ampicillin (19/20 [95%]) and most resistant to gentamicin (5/20 [25%]).

Comment

To treat HS, it is important to understand the cause of the condition. Although the pathogenesis of HS has many unknowns, bacterial colonization and biofilms are thought to play a role. Lipopolysaccharides found in the outer membrane of Gram-negative bacteria are pathogen-associated molecular patterns that present to the toll-like receptors of the human immune system. Once the toll-like receptors recognize the pathogen-associated molecular patterns, macrophages and keratinocytes are activated and release proinflammatory and anti-inflammatory cytokines and chemokines. Persistent presentation of bacteria to the immune system increases immune-cell recruitment and worsens chronic inflammation in patients with HS. Evidence has revealed that bacteria initiate and sustain the inflammation seen in patients with HS; therefore, reducing the amount of bacteria could alleviate some of the symptoms of HS.⁵ It is important to continue learning about the pathophysiology of this disease as well as formulating tailored treatments to minimize patient discomfort and improve quality of life.

Based on the findings of the current study and the safety profile of the medication, tetracyclines may be considered for first-line empiric therapy in patients with HS involving the axilla only, buttocks only, or multiple sites. For additional coverage of P mirabilis in the axilla or inframammary region, TMP/SMX monotherapy or tetracycline plus ampicillin may be considered. For inframammary lesions only, empiric treatment with ampicillin or TMP/ SMX is recommended. For HS lesions in the groin area, coverage of Enterococcus species with ampicillin should be considered. Patients with multiple sites of involvement that include the inframammary or groin regions similarly should receive empiric antibiotics that cover both S aureus and Gram-negative bacteria, such as TMP/SMX or tetracycline and ampicillin, respectively; if the multiple sites do not include the inframammary or groin regions, Gram-negative coverage may not be indicated. Based on our findings, standardization of treatment for patients with HS can allow for earlier and potentially more effective treatment.

In a similar study conducted in 2016, bacteria species were isolated from the axilla, groin, and gluteus/perineum in patients with HS.⁵ In that study, the most prominent bacteria in the axilla was CoNS; in the groin, P mirabilis and E coli; and in the gluteus/perineum, E coli and CoNS. These results differed from ours, which found S aureus as the abundant bacteria in these areas. In the 2016 study, the highest rates of resistance were found for penicillin G, erythromycin, clindamycin, and ampicillin.⁵ In contrast, the current study found high sensitivities for clindamycin and ampicillin, but our results support the finding of high resistance for erythromycin. These differences could be accounted for by the lower sample size of patients in the 2016 study: 68 patients were analyzed for sensitivity results, and 171 patients were analyzed for frequency of bacterial species in patients with HS.⁵

Our study is limited by its relatively small sample size. Additionally, all patients were seen at 1 of 2 clinic sites, located in League City and Galveston, Texas, and the data from this geographic area may not be applicable to patients seen in different climates.

Conclusion

Outcomes for patients with HS improve with early intervention; however, HS treatment may be delayed by selection of ineffective antibiotic therapy. Our study provides clinicians with recommendations for empiric antibiotic treatment based on anatomic location of HS lesions and culture sensitivity profiles. Utilizing tailored antibiotic therapy on initial clinical evaluation may increase early disease control and improve morbidity and disease outcomes, thereby increasing patient quality of life.

There is a shortage of pediatric dermatologists in the United States, with fewer than 2% of practicing dermatologists specializing in pediatrics.¹ Pediatric dermatology has the third highest referral rate by pediatricians but also is the third most challenging specialty to access, with an average appointment wait time of 92 days.^2,3 Another factor leading to increased appointment wait times is the specificity of care required for pediatric patients. Frequently, pediatric patients evaluated by a general dermatologist will be referred to their pediatric dermatology colleagues. As medical students, we were introduced to the field of pediatric dermatology through different avenues—personal experience, research mentorship, or a clinical rotation in medical school. We found ourselves curious about the discrepancy between the supply of and demand for pediatric dermatologists and wondered what could be done to increase awareness of this subspecialty among medical students. We believe this workforce shortage can be ameliorated by improving early exposure to pediatric dermatology. In this article, we explore the existing framework surrounding pediatric dermatology in medical education and offer feasible recommendations and solutions to realistically combat this problem.

Pediatric dermatologists are essential to the greater dermatology community. Pediatric dermatologists receive advanced training in complex pediatric skin conditions that often is lacking in general dermatology residency. A large percentage of pediatric dermatology patients seen in academic medical centers have already been seen by general dermatologists who subsequently referred them to specialty care. In one study, 9.6% (10/108) of practicing pediatric dermatologists noted that their referrals were from general dermatologists.⁴ In another study, 42% (19/45) of referrals to a multidisciplinary pediatric dermatology-genetics were from general dermatologists.⁵ Given the shortage of pediatric dermatologists, these referrals undoubtedly overwhelm the system, and the results of these studies underscore the reality that general dermatologists do not necessarily feel adequately trained in complex pediatric conditions, creating an intrinsic need for pediatric dermatologists.

Admani et al⁶ reported that early mentorship was the single most important factor to 84% (91/109) of survey respondents who pursued pediatric dermatology. Forty percent (40/100) of survey respondents chose their specialty of pediatric dermatology during pediatrics residency, 34% (34/100) during medical school, 17% (17/100) during dermatology residency, and 5% (5/100) during internship, indicating that medical school is a crucial time for recruitment.⁶ It has been noted in the literature that more medical students matched to dermatology residency from schools with dermatology clerkships built into the curriculum than from schools without dedicated dermatology rotations, suggesting that early clinical exposure to dermatology fields has a predictable influence in matching.⁷ Currently, only about 10% (15/155) of allopathic medical schools in the United States offer a formal elective in pediatric dermatology via the Association of American Medical College’s Visiting Student Learning Opportunities program.⁸ When this information was cross-referenced with the most recently matched pediatric dermatology fellowship class (2023-2024), provided by the Fellowship Directors Chair of the Society for Pediatric Dermatology, we found that 17% (4/24) of the matched fellows attended one of these 15 medical schools. We also found that the 2023-2024 pediatric dermatology fellowship class had 12 unmatched spots out of 36 total positions nationwide (33%), highlighting a gap in pediatric dermatology care and placing further strain on an already underserved subspecialty. These data suggest that, while dermatologists may decide to pursue pediatric dermatology fellowships during residency, there is an opportunity to foster interest during medical school training and improve the fellowship match rate.

Several medical schools in the United States incorporate pediatric dermatology into their curricula, including lectures in preclinical courses and career panels to pediatric dermatology electives in the third and fourth years. These institutions can serve as models for other medical schools. Within preclinical content, we recommend creating a designated dermatology unit that can incorporate common pediatric dermatology pathologies also seen by general practitioners, such as common childhood rashes, atopic dermatitis, alopecia areata, seborrheic dermatitis, and acne. Rare pediatric diseases such as epidermolysis bullosa, tuberous sclerosis, and Ehlers-Danlos syndrome also may be included in the unit. If schools are not able to offer a stand-alone dermatology preclinical course, this content can be added to the immunology, musculoskeletal, infectious diseases, or genetics courses to account for the multisystemic effects of some of these conditions. Ideally, schools would offer elective exposure to pediatric dermatology during the clinical years of medical school to increase knowledge of the field; for example, pediatric dermatology materials could be included in core clerkships, as much of this content is applicable to the general pediatrics rotation. In particular, a lecture on common rashes in pediatric patients could be given before starting the core pediatric rotation. Additionally, problem-based pediatric dermatology cases could be implemented during the core pediatrics rotation. If students are offered an independent dermatology clinical elective, the already formatted 2- and 4-week basic dermatology courses designed by the American Academy of Dermatology could serve as suggested teaching guides or as self-teaching resources that could complement the dermatology rotation.^9,10 Pediatric topics (eg, pediatric cutaneous fungal infections) are included within the American Academy of Dermatology basic dermatology curriculum.^8,9

Increasing access to pediatric dermatology resources such as lecture series and mentorship opportunities could further broaden the pediatric dermatology knowledge base of medical students. Within medical school dermatology interest groups, there is an opportunity to have a pediatric dermatology lead to help coordinate lecture series and journal club sessions for interested students. The Society for Pediatric Dermatology and the Pediatric Dermatology Research Alliance have created programs to support students, and we encourage schools to raise awareness of these organizations as well as conference and grant opportunities. These initiatives foster meaningful mentor-mentee relationships, and more medical students may be interested if they are aware of these support networks.

There also may be opportunities to create residency tracks that increase the number of dermatology residency applicants. Programs such as the newly implemented pediatric dermatology track at the University of Pennsylvania and New York University allow medical students who are interested in pursuing pediatric dermatology to have a more focused and linear training path.^11,12 Due to the inherent competition in matching into dermatology, we surmise that many students with interest in pediatric dermatology are lost to pediatric residencies. Given the large percentage of pediatric residents who ultimately develop an interest in pediatric dermatology, holding a spot for pediatric dermatology applicants—akin to the combined medical-dermatology spots—may be an avenue to increase the pool of pediatric dermatology fellows.^1,6 Another avenue is to encourage the development of first-year pediatric internship tracks that lead directly into dermatology residency, such as newly established programs at the University of Pennsylvania and New York University.^11,12

As a group of both aspiring and practicing pediatric dermatologists, we have identified opportunities for formalized education in and early exposure to this subspecialty during medical training instead of leaving the discovery of the field to chance. The gaps in medical education that we have identified have already led us to present potential curricular changes to the medical education committee at our home institution. We hope to inspire the development of strong pediatric dermatology education at the medical school level.

While the solution to the pediatric dermatology workforce shortage is complex and multifaceted, there is a unique opportunity to target medical students through mentorship, access to education, and clinical experiences. We recommend that medical schools implement these educational methods and track the efficacy of these interventions to quantify the predicted association between an increased workforce and early exposure to pediatric dermatology. Addressing a lack of exposure to the field and increasing support of students pursuing pediatric dermatology can help to alleviate the shortage at the earliest point in training.

There is a shortage of pediatric dermatologists in the United States, with fewer than 2% of practicing dermatologists specializing in pediatrics.¹ Pediatric dermatology has the third highest referral rate by pediatricians but also is the third most challenging specialty to access, with an average appointment wait time of 92 days.^2,3 Another factor leading to increased appointment wait times is the specificity of care required for pediatric patients. Frequently, pediatric patients evaluated by a general dermatologist will be referred to their pediatric dermatology colleagues. As medical students, we were introduced to the field of pediatric dermatology through different avenues—personal experience, research mentorship, or a clinical rotation in medical school. We found ourselves curious about the discrepancy between the supply of and demand for pediatric dermatologists and wondered what could be done to increase awareness of this subspecialty among medical students. We believe this workforce shortage can be ameliorated by improving early exposure to pediatric dermatology. In this article, we explore the existing framework surrounding pediatric dermatology in medical education and offer feasible recommendations and solutions to realistically combat this problem.

Pediatric dermatologists are essential to the greater dermatology community. Pediatric dermatologists receive advanced training in complex pediatric skin conditions that often is lacking in general dermatology residency. A large percentage of pediatric dermatology patients seen in academic medical centers have already been seen by general dermatologists who subsequently referred them to specialty care. In one study, 9.6% (10/108) of practicing pediatric dermatologists noted that their referrals were from general dermatologists.⁴ In another study, 42% (19/45) of referrals to a multidisciplinary pediatric dermatology-genetics were from general dermatologists.⁵ Given the shortage of pediatric dermatologists, these referrals undoubtedly overwhelm the system, and the results of these studies underscore the reality that general dermatologists do not necessarily feel adequately trained in complex pediatric conditions, creating an intrinsic need for pediatric dermatologists.

Admani et al⁶ reported that early mentorship was the single most important factor to 84% (91/109) of survey respondents who pursued pediatric dermatology. Forty percent (40/100) of survey respondents chose their specialty of pediatric dermatology during pediatrics residency, 34% (34/100) during medical school, 17% (17/100) during dermatology residency, and 5% (5/100) during internship, indicating that medical school is a crucial time for recruitment.⁶ It has been noted in the literature that more medical students matched to dermatology residency from schools with dermatology clerkships built into the curriculum than from schools without dedicated dermatology rotations, suggesting that early clinical exposure to dermatology fields has a predictable influence in matching.⁷ Currently, only about 10% (15/155) of allopathic medical schools in the United States offer a formal elective in pediatric dermatology via the Association of American Medical College’s Visiting Student Learning Opportunities program.⁸ When this information was cross-referenced with the most recently matched pediatric dermatology fellowship class (2023-2024), provided by the Fellowship Directors Chair of the Society for Pediatric Dermatology, we found that 17% (4/24) of the matched fellows attended one of these 15 medical schools. We also found that the 2023-2024 pediatric dermatology fellowship class had 12 unmatched spots out of 36 total positions nationwide (33%), highlighting a gap in pediatric dermatology care and placing further strain on an already underserved subspecialty. These data suggest that, while dermatologists may decide to pursue pediatric dermatology fellowships during residency, there is an opportunity to foster interest during medical school training and improve the fellowship match rate.

Several medical schools in the United States incorporate pediatric dermatology into their curricula, including lectures in preclinical courses and career panels to pediatric dermatology electives in the third and fourth years. These institutions can serve as models for other medical schools. Within preclinical content, we recommend creating a designated dermatology unit that can incorporate common pediatric dermatology pathologies also seen by general practitioners, such as common childhood rashes, atopic dermatitis, alopecia areata, seborrheic dermatitis, and acne. Rare pediatric diseases such as epidermolysis bullosa, tuberous sclerosis, and Ehlers-Danlos syndrome also may be included in the unit. If schools are not able to offer a stand-alone dermatology preclinical course, this content can be added to the immunology, musculoskeletal, infectious diseases, or genetics courses to account for the multisystemic effects of some of these conditions. Ideally, schools would offer elective exposure to pediatric dermatology during the clinical years of medical school to increase knowledge of the field; for example, pediatric dermatology materials could be included in core clerkships, as much of this content is applicable to the general pediatrics rotation. In particular, a lecture on common rashes in pediatric patients could be given before starting the core pediatric rotation. Additionally, problem-based pediatric dermatology cases could be implemented during the core pediatrics rotation. If students are offered an independent dermatology clinical elective, the already formatted 2- and 4-week basic dermatology courses designed by the American Academy of Dermatology could serve as suggested teaching guides or as self-teaching resources that could complement the dermatology rotation.^9,10 Pediatric topics (eg, pediatric cutaneous fungal infections) are included within the American Academy of Dermatology basic dermatology curriculum.^8,9

Increasing access to pediatric dermatology resources such as lecture series and mentorship opportunities could further broaden the pediatric dermatology knowledge base of medical students. Within medical school dermatology interest groups, there is an opportunity to have a pediatric dermatology lead to help coordinate lecture series and journal club sessions for interested students. The Society for Pediatric Dermatology and the Pediatric Dermatology Research Alliance have created programs to support students, and we encourage schools to raise awareness of these organizations as well as conference and grant opportunities. These initiatives foster meaningful mentor-mentee relationships, and more medical students may be interested if they are aware of these support networks.

There also may be opportunities to create residency tracks that increase the number of dermatology residency applicants. Programs such as the newly implemented pediatric dermatology track at the University of Pennsylvania and New York University allow medical students who are interested in pursuing pediatric dermatology to have a more focused and linear training path.^11,12 Due to the inherent competition in matching into dermatology, we surmise that many students with interest in pediatric dermatology are lost to pediatric residencies. Given the large percentage of pediatric residents who ultimately develop an interest in pediatric dermatology, holding a spot for pediatric dermatology applicants—akin to the combined medical-dermatology spots—may be an avenue to increase the pool of pediatric dermatology fellows.^1,6 Another avenue is to encourage the development of first-year pediatric internship tracks that lead directly into dermatology residency, such as newly established programs at the University of Pennsylvania and New York University.^11,12

As a group of both aspiring and practicing pediatric dermatologists, we have identified opportunities for formalized education in and early exposure to this subspecialty during medical training instead of leaving the discovery of the field to chance. The gaps in medical education that we have identified have already led us to present potential curricular changes to the medical education committee at our home institution. We hope to inspire the development of strong pediatric dermatology education at the medical school level.

While the solution to the pediatric dermatology workforce shortage is complex and multifaceted, there is a unique opportunity to target medical students through mentorship, access to education, and clinical experiences. We recommend that medical schools implement these educational methods and track the efficacy of these interventions to quantify the predicted association between an increased workforce and early exposure to pediatric dermatology. Addressing a lack of exposure to the field and increasing support of students pursuing pediatric dermatology can help to alleviate the shortage at the earliest point in training.

There is a shortage of pediatric dermatologists in the United States, with fewer than 2% of practicing dermatologists specializing in pediatrics.¹ Pediatric dermatology has the third highest referral rate by pediatricians but also is the third most challenging specialty to access, with an average appointment wait time of 92 days.^2,3 Another factor leading to increased appointment wait times is the specificity of care required for pediatric patients. Frequently, pediatric patients evaluated by a general dermatologist will be referred to their pediatric dermatology colleagues. As medical students, we were introduced to the field of pediatric dermatology through different avenues—personal experience, research mentorship, or a clinical rotation in medical school. We found ourselves curious about the discrepancy between the supply of and demand for pediatric dermatologists and wondered what could be done to increase awareness of this subspecialty among medical students. We believe this workforce shortage can be ameliorated by improving early exposure to pediatric dermatology. In this article, we explore the existing framework surrounding pediatric dermatology in medical education and offer feasible recommendations and solutions to realistically combat this problem.

Pediatric dermatologists are essential to the greater dermatology community. Pediatric dermatologists receive advanced training in complex pediatric skin conditions that often is lacking in general dermatology residency. A large percentage of pediatric dermatology patients seen in academic medical centers have already been seen by general dermatologists who subsequently referred them to specialty care. In one study, 9.6% (10/108) of practicing pediatric dermatologists noted that their referrals were from general dermatologists.⁴ In another study, 42% (19/45) of referrals to a multidisciplinary pediatric dermatology-genetics were from general dermatologists.⁵ Given the shortage of pediatric dermatologists, these referrals undoubtedly overwhelm the system, and the results of these studies underscore the reality that general dermatologists do not necessarily feel adequately trained in complex pediatric conditions, creating an intrinsic need for pediatric dermatologists.

Admani et al⁶ reported that early mentorship was the single most important factor to 84% (91/109) of survey respondents who pursued pediatric dermatology. Forty percent (40/100) of survey respondents chose their specialty of pediatric dermatology during pediatrics residency, 34% (34/100) during medical school, 17% (17/100) during dermatology residency, and 5% (5/100) during internship, indicating that medical school is a crucial time for recruitment.⁶ It has been noted in the literature that more medical students matched to dermatology residency from schools with dermatology clerkships built into the curriculum than from schools without dedicated dermatology rotations, suggesting that early clinical exposure to dermatology fields has a predictable influence in matching.⁷ Currently, only about 10% (15/155) of allopathic medical schools in the United States offer a formal elective in pediatric dermatology via the Association of American Medical College’s Visiting Student Learning Opportunities program.⁸ When this information was cross-referenced with the most recently matched pediatric dermatology fellowship class (2023-2024), provided by the Fellowship Directors Chair of the Society for Pediatric Dermatology, we found that 17% (4/24) of the matched fellows attended one of these 15 medical schools. We also found that the 2023-2024 pediatric dermatology fellowship class had 12 unmatched spots out of 36 total positions nationwide (33%), highlighting a gap in pediatric dermatology care and placing further strain on an already underserved subspecialty. These data suggest that, while dermatologists may decide to pursue pediatric dermatology fellowships during residency, there is an opportunity to foster interest during medical school training and improve the fellowship match rate.

Several medical schools in the United States incorporate pediatric dermatology into their curricula, including lectures in preclinical courses and career panels to pediatric dermatology electives in the third and fourth years. These institutions can serve as models for other medical schools. Within preclinical content, we recommend creating a designated dermatology unit that can incorporate common pediatric dermatology pathologies also seen by general practitioners, such as common childhood rashes, atopic dermatitis, alopecia areata, seborrheic dermatitis, and acne. Rare pediatric diseases such as epidermolysis bullosa, tuberous sclerosis, and Ehlers-Danlos syndrome also may be included in the unit. If schools are not able to offer a stand-alone dermatology preclinical course, this content can be added to the immunology, musculoskeletal, infectious diseases, or genetics courses to account for the multisystemic effects of some of these conditions. Ideally, schools would offer elective exposure to pediatric dermatology during the clinical years of medical school to increase knowledge of the field; for example, pediatric dermatology materials could be included in core clerkships, as much of this content is applicable to the general pediatrics rotation. In particular, a lecture on common rashes in pediatric patients could be given before starting the core pediatric rotation. Additionally, problem-based pediatric dermatology cases could be implemented during the core pediatrics rotation. If students are offered an independent dermatology clinical elective, the already formatted 2- and 4-week basic dermatology courses designed by the American Academy of Dermatology could serve as suggested teaching guides or as self-teaching resources that could complement the dermatology rotation.^9,10 Pediatric topics (eg, pediatric cutaneous fungal infections) are included within the American Academy of Dermatology basic dermatology curriculum.^8,9

Increasing access to pediatric dermatology resources such as lecture series and mentorship opportunities could further broaden the pediatric dermatology knowledge base of medical students. Within medical school dermatology interest groups, there is an opportunity to have a pediatric dermatology lead to help coordinate lecture series and journal club sessions for interested students. The Society for Pediatric Dermatology and the Pediatric Dermatology Research Alliance have created programs to support students, and we encourage schools to raise awareness of these organizations as well as conference and grant opportunities. These initiatives foster meaningful mentor-mentee relationships, and more medical students may be interested if they are aware of these support networks.

There also may be opportunities to create residency tracks that increase the number of dermatology residency applicants. Programs such as the newly implemented pediatric dermatology track at the University of Pennsylvania and New York University allow medical students who are interested in pursuing pediatric dermatology to have a more focused and linear training path.^11,12 Due to the inherent competition in matching into dermatology, we surmise that many students with interest in pediatric dermatology are lost to pediatric residencies. Given the large percentage of pediatric residents who ultimately develop an interest in pediatric dermatology, holding a spot for pediatric dermatology applicants—akin to the combined medical-dermatology spots—may be an avenue to increase the pool of pediatric dermatology fellows.^1,6 Another avenue is to encourage the development of first-year pediatric internship tracks that lead directly into dermatology residency, such as newly established programs at the University of Pennsylvania and New York University.^11,12

As a group of both aspiring and practicing pediatric dermatologists, we have identified opportunities for formalized education in and early exposure to this subspecialty during medical training instead of leaving the discovery of the field to chance. The gaps in medical education that we have identified have already led us to present potential curricular changes to the medical education committee at our home institution. We hope to inspire the development of strong pediatric dermatology education at the medical school level.

While the solution to the pediatric dermatology workforce shortage is complex and multifaceted, there is a unique opportunity to target medical students through mentorship, access to education, and clinical experiences. We recommend that medical schools implement these educational methods and track the efficacy of these interventions to quantify the predicted association between an increased workforce and early exposure to pediatric dermatology. Addressing a lack of exposure to the field and increasing support of students pursuing pediatric dermatology can help to alleviate the shortage at the earliest point in training.

THE DIAGNOSIS: Acral Eruptive Syringoma

Syringomas are small, benign, often asymptomatic eccrine tumors that originate in the intraepidermal portion of eccrine sweat ducts.¹ Clinically, they present as multiple symmetric white-to-yellow or discrete flesh-colored papules measuring 1 to 3 mm in diameter, often located on the face (most commonly on the eyelids), with a greater prevalence in middle-aged women. Occasionally, they manifest in other locations such as the cheeks, chest, axillae, abdomen, and groin.²

In 1987, Friedman and Butler³ developed a classification system categorizing syringomas into 4 clinical subtypes: familial syringoma, localized syringoma, Down syndrome–related syringoma, and generalized syringoma. The fourth subtype includes the variant of eruptive syringoma,³ a rare clinical manifestation that often develops before or during puberty with several flesh-colored or lightly pigmented papules on the neck, anterior chest, upper abdomen, axillae, periumbilical region, and/or genital region.^1,4,5 The etiology of eruptive syringomas is unclear, although it has been linked to abnormal proliferation of sweat glands due to an underlying local inflammatory process.⁶

Acral distribution of syringomas is a rare variant that can manifest as part of generalized eruptive syringoma with consequent involvement of the arms and other areas.^5,7 There are limited case reports on eruptive syringomas with predominant acral distribution.⁸ Compared to classic syringomas, the acral variant is associated with an older age of onset as well as a similar prevalence between men and women.⁹ Acral eruptive syringoma (AES) usually is isolated to the distal arms and legs. The most commonly affected region is the anterior surface of the forearms, although involvement of the dorsal hands, wrists, and feet also has been reported.^10-16

The first known case of AES, which was reported in 1977, described eruptive syringomas on the dorsal hands of a healthy 31-year-old man.¹⁷ Several cases have been reported since then, mostly in patients aged 30 to 60 years, with predominant involvement of the dorsal hands and forearms.^18-24 A review of Embase as well as PubMed articles indexed for MEDLINE using the search terms syringoma OR eccrine ductal tumor and eruptive OR acral OR arms OR forearms OR extremities identified 19 reported cases of AES between 1977 and 2023. For the reported AES cases, the mean (SD) age at diagnosis was 45.1 years (15.96 years), with patient ages ranging from 19 to 76 years. Notably, most cases occurred in individuals aged between 30 and 60 years, which deviates from the typical age of onset of localized syringomas, commonly seen during puberty or early adulthood.

Currently, AES is categorized within the clinical presentation of eruptive syringoma. Nevertheless, some authors have proposed classifying it as a distinct fifth clinical group due to specific features that distinguish it from generalized eruptive syringoma.⁹ This reclassification has considerable implications for the differential diagnosis, particularly because exclusive acral involvement poses a substantial diagnostic challenge and often requires histologic confirmation.

As shown in the Figure, histopathologic examination revealed tubular structures in the upper dermis with characteristic comma-shaped extensions. Some of these structures were lined with cuboidal cells and contained eosinophilic material within the lumen. There was no involvement of the epidermis or deeper dermis. The histologic features were consistent with syringoma, which is distinguished by its predominant involvement of the upper dermis and the presence of enlarged, dilated eccrine ducts, as observed in our case.

Treatment of syringomas often is challenging due to the high rate of recurrence and the risk for postinflammatory hyperpigmentation. Since the condition is benign, treatment typically is pursued for aesthetic reasons. Various therapeutic approaches have been reported, each with diverse response rates. The most common method involves surgical intervention, either with electrodesiccation or CO₂ laser—both of which have shown satisfactory resolution of lesions without recurrence at 1-year follow-up, with no major scarring reported.^25,26 Alternatively, topical management with retinoids daily over a 4-month period leads to flattening of the tumors with no further appearance of new lesions.²⁷ Despite the availability of numerous management options, establishing a first-line treatment remains controversial due to the high risk for recurrence and the variability in the number and location of lesions among individual patients. In our case, given the benign nature of syringomas, the asymptomatic nature of the lesions, the involvement of noncritical aesthetic areas, and the limited response to noninvasive therapeutic options, the patient was informed of the diagnosis, and no further pharmacologic or surgical intervention was pursued.

THE DIAGNOSIS: Acral Eruptive Syringoma

Syringomas are small, benign, often asymptomatic eccrine tumors that originate in the intraepidermal portion of eccrine sweat ducts.¹ Clinically, they present as multiple symmetric white-to-yellow or discrete flesh-colored papules measuring 1 to 3 mm in diameter, often located on the face (most commonly on the eyelids), with a greater prevalence in middle-aged women. Occasionally, they manifest in other locations such as the cheeks, chest, axillae, abdomen, and groin.²

In 1987, Friedman and Butler³ developed a classification system categorizing syringomas into 4 clinical subtypes: familial syringoma, localized syringoma, Down syndrome–related syringoma, and generalized syringoma. The fourth subtype includes the variant of eruptive syringoma,³ a rare clinical manifestation that often develops before or during puberty with several flesh-colored or lightly pigmented papules on the neck, anterior chest, upper abdomen, axillae, periumbilical region, and/or genital region.^1,4,5 The etiology of eruptive syringomas is unclear, although it has been linked to abnormal proliferation of sweat glands due to an underlying local inflammatory process.⁶

Acral distribution of syringomas is a rare variant that can manifest as part of generalized eruptive syringoma with consequent involvement of the arms and other areas.^5,7 There are limited case reports on eruptive syringomas with predominant acral distribution.⁸ Compared to classic syringomas, the acral variant is associated with an older age of onset as well as a similar prevalence between men and women.⁹ Acral eruptive syringoma (AES) usually is isolated to the distal arms and legs. The most commonly affected region is the anterior surface of the forearms, although involvement of the dorsal hands, wrists, and feet also has been reported.^10-16

The first known case of AES, which was reported in 1977, described eruptive syringomas on the dorsal hands of a healthy 31-year-old man.¹⁷ Several cases have been reported since then, mostly in patients aged 30 to 60 years, with predominant involvement of the dorsal hands and forearms.^18-24 A review of Embase as well as PubMed articles indexed for MEDLINE using the search terms syringoma OR eccrine ductal tumor and eruptive OR acral OR arms OR forearms OR extremities identified 19 reported cases of AES between 1977 and 2023. For the reported AES cases, the mean (SD) age at diagnosis was 45.1 years (15.96 years), with patient ages ranging from 19 to 76 years. Notably, most cases occurred in individuals aged between 30 and 60 years, which deviates from the typical age of onset of localized syringomas, commonly seen during puberty or early adulthood.

Currently, AES is categorized within the clinical presentation of eruptive syringoma. Nevertheless, some authors have proposed classifying it as a distinct fifth clinical group due to specific features that distinguish it from generalized eruptive syringoma.⁹ This reclassification has considerable implications for the differential diagnosis, particularly because exclusive acral involvement poses a substantial diagnostic challenge and often requires histologic confirmation.

As shown in the Figure, histopathologic examination revealed tubular structures in the upper dermis with characteristic comma-shaped extensions. Some of these structures were lined with cuboidal cells and contained eosinophilic material within the lumen. There was no involvement of the epidermis or deeper dermis. The histologic features were consistent with syringoma, which is distinguished by its predominant involvement of the upper dermis and the presence of enlarged, dilated eccrine ducts, as observed in our case.

Treatment of syringomas often is challenging due to the high rate of recurrence and the risk for postinflammatory hyperpigmentation. Since the condition is benign, treatment typically is pursued for aesthetic reasons. Various therapeutic approaches have been reported, each with diverse response rates. The most common method involves surgical intervention, either with electrodesiccation or CO₂ laser—both of which have shown satisfactory resolution of lesions without recurrence at 1-year follow-up, with no major scarring reported.^25,26 Alternatively, topical management with retinoids daily over a 4-month period leads to flattening of the tumors with no further appearance of new lesions.²⁷ Despite the availability of numerous management options, establishing a first-line treatment remains controversial due to the high risk for recurrence and the variability in the number and location of lesions among individual patients. In our case, given the benign nature of syringomas, the asymptomatic nature of the lesions, the involvement of noncritical aesthetic areas, and the limited response to noninvasive therapeutic options, the patient was informed of the diagnosis, and no further pharmacologic or surgical intervention was pursued.

THE DIAGNOSIS: Acral Eruptive Syringoma

Syringomas are small, benign, often asymptomatic eccrine tumors that originate in the intraepidermal portion of eccrine sweat ducts.¹ Clinically, they present as multiple symmetric white-to-yellow or discrete flesh-colored papules measuring 1 to 3 mm in diameter, often located on the face (most commonly on the eyelids), with a greater prevalence in middle-aged women. Occasionally, they manifest in other locations such as the cheeks, chest, axillae, abdomen, and groin.²

In 1987, Friedman and Butler³ developed a classification system categorizing syringomas into 4 clinical subtypes: familial syringoma, localized syringoma, Down syndrome–related syringoma, and generalized syringoma. The fourth subtype includes the variant of eruptive syringoma,³ a rare clinical manifestation that often develops before or during puberty with several flesh-colored or lightly pigmented papules on the neck, anterior chest, upper abdomen, axillae, periumbilical region, and/or genital region.^1,4,5 The etiology of eruptive syringomas is unclear, although it has been linked to abnormal proliferation of sweat glands due to an underlying local inflammatory process.⁶

Acral distribution of syringomas is a rare variant that can manifest as part of generalized eruptive syringoma with consequent involvement of the arms and other areas.^5,7 There are limited case reports on eruptive syringomas with predominant acral distribution.⁸ Compared to classic syringomas, the acral variant is associated with an older age of onset as well as a similar prevalence between men and women.⁹ Acral eruptive syringoma (AES) usually is isolated to the distal arms and legs. The most commonly affected region is the anterior surface of the forearms, although involvement of the dorsal hands, wrists, and feet also has been reported.^10-16

The first known case of AES, which was reported in 1977, described eruptive syringomas on the dorsal hands of a healthy 31-year-old man.¹⁷ Several cases have been reported since then, mostly in patients aged 30 to 60 years, with predominant involvement of the dorsal hands and forearms.^18-24 A review of Embase as well as PubMed articles indexed for MEDLINE using the search terms syringoma OR eccrine ductal tumor and eruptive OR acral OR arms OR forearms OR extremities identified 19 reported cases of AES between 1977 and 2023. For the reported AES cases, the mean (SD) age at diagnosis was 45.1 years (15.96 years), with patient ages ranging from 19 to 76 years. Notably, most cases occurred in individuals aged between 30 and 60 years, which deviates from the typical age of onset of localized syringomas, commonly seen during puberty or early adulthood.

Currently, AES is categorized within the clinical presentation of eruptive syringoma. Nevertheless, some authors have proposed classifying it as a distinct fifth clinical group due to specific features that distinguish it from generalized eruptive syringoma.⁹ This reclassification has considerable implications for the differential diagnosis, particularly because exclusive acral involvement poses a substantial diagnostic challenge and often requires histologic confirmation.

As shown in the Figure, histopathologic examination revealed tubular structures in the upper dermis with characteristic comma-shaped extensions. Some of these structures were lined with cuboidal cells and contained eosinophilic material within the lumen. There was no involvement of the epidermis or deeper dermis. The histologic features were consistent with syringoma, which is distinguished by its predominant involvement of the upper dermis and the presence of enlarged, dilated eccrine ducts, as observed in our case.

Treatment of syringomas often is challenging due to the high rate of recurrence and the risk for postinflammatory hyperpigmentation. Since the condition is benign, treatment typically is pursued for aesthetic reasons. Various therapeutic approaches have been reported, each with diverse response rates. The most common method involves surgical intervention, either with electrodesiccation or CO₂ laser—both of which have shown satisfactory resolution of lesions without recurrence at 1-year follow-up, with no major scarring reported.^25,26 Alternatively, topical management with retinoids daily over a 4-month period leads to flattening of the tumors with no further appearance of new lesions.²⁷ Despite the availability of numerous management options, establishing a first-line treatment remains controversial due to the high risk for recurrence and the variability in the number and location of lesions among individual patients. In our case, given the benign nature of syringomas, the asymptomatic nature of the lesions, the involvement of noncritical aesthetic areas, and the limited response to noninvasive therapeutic options, the patient was informed of the diagnosis, and no further pharmacologic or surgical intervention was pursued.

Blood cultures provide crucial evidence for diagnostic medicine, specifically aimed at identifying the presence of microbial infections in the bloodstream. Blood culturing is instrumental in diagnosing conditions such as sepsis, bacteremia, or fungemia, where the identification of the causative agent is necessary for targeted and effective treatment.¹

The process involves aseptically drawing blood into sterile culture bottles, minimizing the risk of contamination with well-established guidelines. These culture bottles contain specific growth media that support the replication of microorganisms if they are present. Once the blood specimen is collected, it incubates, allowing any potential pathogens to grow. Subsequent analysis and identification of these microorganisms enable health care professionals (HCPs) to prescribe appropriate antimicrobial therapies to treat specific infections, contributing to more effective and targeted patient care.²

The reliability of blood culture results depends on minimizing contamination risk, a challenge inherent in the procedure. Contamination can lead to false-positive results, potentially misguiding treatment.³ HCPs must adhere to strict aseptic techniques during blood draws, ensuring proper skin preparation with antiseptic solutions. The use of sterile equipment and avoiding prolonged tourniquet application helps maintain the integrity of the blood specimen. Timely inoculation of blood into culture bottles and careful handling are essential to mitigate contamination risk.² Regular training and reinforcement of proper techniques is important to uphold the accuracy of blood culture results and enhance the reliability of diagnoses and treatment decisions.³ Despite diligent contamination prevention efforts, health care systems struggle to maintain contamination rates below the 3.0% national benchmark set by the Clinical & Laboratory Standards Institute (CLSI).⁴

Blood culture contamination is a critical concern in clinical practice; it can lead to misdiagnosis, prolonged hospital stays, unnecessary antibiotic use, and increased health care costs.⁵ Monitoring blood culture contamination is integral to patient safety, avoiding inappropriate and potentially harmful treatment, providing efficient care, contributing to antibiotic stewardship, supporting cost efficiency, and maintaining quality assurance and clinical research practices for public health.⁶

The initial specimen diversion technique (ISDT) recently emerged as a potential strategy to reduce blood culture contamination rates. This technique involves diverting a small portion of the initial blood plus the skin plug from the hollow needle away from the primary collection site before filling the culture bottles. This process minimizes skin surface contaminants, providing a cleaner blood specimen for culturing.⁷

The ISDT was introduced as a result of historically elevated contamination rates.⁸ Despite implementing various mitigation methods, the US Department of Veterans Affairs (VA) Central Texas Healthcare System (VACTHCS) has struggled to meet the national benchmark of maintaining blood culture contamination < 3.0%. The VACTHCS is a 146-bed teaching hospital with about 30,000 annual visits at the Olin E. Teague Veterans Affairs Medical Center (OETVMC) emergency department (ED). VACTHCS conducted a 16-month pilot study using 2 commercially available ISDT devices and published the findings.⁸

The Military Construction, Veterans Affairs, and Related Agencies Appropriations Act, 2022 (MilCon-VA Act) committee report prioritized the reduction of blood culture contamination to < 1% to prevent health risks and harm to veterans undergoing blood testing for the diagnosis of sepsis.⁹ Because it had been 5 years since OETVMC began using an ISDT in the ED, the ISDT adaptation strategy for mitigating blood culture contamination was revisited per institution policy.

The objective of this quality improvement project was to analyze retrospective data to understand the long-term impact of ISDT use on blood culture contamination rates. We hypothesized that ISDT use would contribute to efforts to maintain OETVMC ED blood culture contamination rate below the national (3.0%) and VACTHCS (2.5%) thresholds. This project assessed the progress for reducing blood culture contamination compared with the pre-ISDT era.⁸

METHODS

This retrospective analysis compared the blood culture contamination rates 36 months before and after the introduction of the ISDT device at the OETVMC ED. The preimplementation period was from December 2014 through November 2017 (36 months) and the postimplementation period was December 2017 through November 2020 (36 months). Data were collected from the Department of Pathology and Microbiology blood culture records of all adult patients admitted to the hospital through the ED and required blood cultures for suspicion of infection. Protected health information and VA sensitive information were not collected: all data were deidentified. A total of 18,541 blood cultures were collected 36 months preimplementation and 14,865 blood cultures were collected up to 36 months postimplementation. For comparison purposes, a similar dataset was collected from patients’ blood samples drawn by phlebotomists in the laboratory, where there had been no previous issues with overcontamination; no ISDT devices were used in the collection of these samples.

Blood Culture Contamination Variable

Blood cultures were monitored using the BACT/ALERT 3D (bioMérieux) and subsequently BACT/ALERT VIRTUO (bioMérieux), with positive bottles characterized by VITEK MS Matrix Assisted Laser Desorption Ionization Time-of-Flight technology (bioMérieux) and automated susceptibility testing (VITEK 2 [bioMérieux]).¹⁰ In an updated review of blood culture contamination, the American Society for Microbiology used the College of American Pathologists' Q-Probes quality improvement studies as a guideline for classifying contamination. A sample was determined to be contaminated if ≥ 1 of the following organisms were found in only 1 bottle in a series of blood culture sets: coagulase-negative staphylococci, Micrococcus species, α-hemolytic viridans group streptococci, Corynebacterium species, Propionibacterium acnes, and Bacillus species.¹¹ The contamination assessment criteria remained unchanged, except for use of an ISDT device in blood culture collection at the ED.

The VACTHCS Infection Prevention Department ensured that the ISDT device was available and that ED nurses were trained annually on its use to collect blood cultures. Monthly reports of contamination were sent to the nursing supervisor for corrective action and retraining. The initial performance improvement project was slated for 16 months but was expanded to a 6-year period of retrospective data to obtain strong correlation.

Statistical Analysis

Contamination rates were recorded monthly from the hospital laboratory information management system for 36 months both before and after ISDT adoption. Statistical analysis was performed using a 2-tailed unpaired t-test to compare monthly contamination rates for the 2 periods with GraphPad Prism version 10.0.0 for Windows.

RESULTS

Prior to 2017, the ED reported contamination rates above the national (3.0%) and OETVMC thresholds (2.5%), with a mean of 4.5% (95% CI, 3.90-4.90).⁸ After ISDT implementation, the ED showed significant improvement with a reduction to mean 2.6% (95% CI, 2.10-3.20) (P < .001) (Figure 1). Figure 2 shows monthly blood culture contamination rates at the ED from December 2014 through November 2020. Month 36 (November 2017) shows a clear dip in contamination rate when the ISDT was introduced and month 37 to month 44 show remarkably low contamination rates. During this time, the institute experimented with 2 ISDT devices, and closer scrutiny may reveal this period as an outlier due to the monitoring of ISDT application, as previously reported.⁸

The blood culture contamination rate for samples drawn by the phlebotomists in the laboratory (excluding the ED) was calculated during the same time period (Figure 3). Non-ED contamination rates remained below 2.5% for 69 of 72 months.

DISCUSSION

The blood culture contamination rate in the OETVMC ED dropped following ISDT implementation and continued to show long-term benefits. For the 36-month period following ISDT implementation, the mean contamination rate was 2.6%, which was below the national target threshold of 3.0% and close to the OETVMC target of 2.5%. These results suggest that ISDT can have a positive impact on patient care and laboratory efficiency. Improvements in the blood contamination rates in the ED can have a positive impact on the overall hospital contamination rates.

Blood drawn by phlebotomists in the hospital laboratory infrequently had contamination rates that exceeded the 2.5% target threshold. Because the non-ED contamination rates did not change throughout the comparison period, other factors were likely not involved in the improvements seen in the ED. The decision to implement ISDT exclusively in the ED was based on its historically elevated contamination rate.⁸ Issues with blood culture contamination in EDs across various hospital systems are well documented and not unique to VACTHCS.¹²

Contamination in blood cultures can be a significant issue in the hospital. It occurs when microorganisms from the skin or environment enter the blood culture sample during collection. Moreover, it can contribute to antibiotic resistance when patients are prescribed inappropriate antibiotics. It is also important to ensure HCPs are well-trained and consistently follow standardized protocols and understand the implications of false-positive results.¹³

ISDT helps reduce false-positive results and is a significant advancement in the field of blood culture collection.^8,14 By discarding the initial blood, it ensures that only the true bloodstream sample is cultured, leading to more accurate results.¹⁵ It also may minimize the risk of contamination-related delays in diagnosis and treatment and benefits patients and health care institutions by potentially reducing hospital stays, unnecessary antibiotic use, and health care costs.

One of the ISDT device manufacturers estimated the financial impact on OETVMC based on the pilot project.⁸ While this study did not calculate the direct and indirect cost savings associated with this process improvement, the manufacturer’s website suggests that VACTHCS could annually save about $486,000.¹⁶ Furthermore, implementation of ISDT may improve laboratory efficiency, as they reduce the workload associated with identifying and reporting false-positive cultures. ⁶ ISDT devices represent a valuable tool in the efforts to reduce blood culture contamination and its wide-ranging implications in clinical settings. While ISDT alone will not be sufficient in achieving a lower threshold (< 1%) of blood culture contamination, it can be part of a multiprong effort that optimizes best practices in the collection, handling, and management of blood cultures.

Continuous quality improvement efforts and monitoring of blood culture contamination rates can help health care institutions identify problem areas and implement necessary changes. Addressing blood culture contamination can improve patient care, reduce costs, and address antibiotic resistance.

Limitations

This study was limited by its study design, which did not use a side-by-side comparison of blood cultures from groups with and without ISDT. All blood cultures from patients in the region were processed at OETVMC, which may not be representative of non-VA EDs. Part of this study took place during the COVID-19 pandemic, which may have skewed data. Additionally, hospital data were collected from a veteran population in Central Texas, and the lack of demographic diversity may not be generalizable to the greater population.

CONCLUSIONS

The findings of this study suggest ISDT may be effective in reducing blood culture contamination rates in the high-risk ED environment, which aligns with previous research. ^5,14 The ISDT may help reduce blood culture contamination rates, improving the quality of patient care and reducing health care costs. MilCon-VA mandated that all VA facilities have blood culture contamination as a metric with a goal of blood culture contamination rates < 1%.⁸ However, achieving this goal remains a challenge. Further research and continuous quality improvement efforts are necessary to achieve it. Consistently achieving a contamination threshold of < 1% may require minimizing human error. An automated robotic venipuncture device, as recently designed and reported, may be necessary to reduce human error in blood draw and contamination.¹⁶

Blood cultures provide crucial evidence for diagnostic medicine, specifically aimed at identifying the presence of microbial infections in the bloodstream. Blood culturing is instrumental in diagnosing conditions such as sepsis, bacteremia, or fungemia, where the identification of the causative agent is necessary for targeted and effective treatment.¹

The process involves aseptically drawing blood into sterile culture bottles, minimizing the risk of contamination with well-established guidelines. These culture bottles contain specific growth media that support the replication of microorganisms if they are present. Once the blood specimen is collected, it incubates, allowing any potential pathogens to grow. Subsequent analysis and identification of these microorganisms enable health care professionals (HCPs) to prescribe appropriate antimicrobial therapies to treat specific infections, contributing to more effective and targeted patient care.²

The reliability of blood culture results depends on minimizing contamination risk, a challenge inherent in the procedure. Contamination can lead to false-positive results, potentially misguiding treatment.³ HCPs must adhere to strict aseptic techniques during blood draws, ensuring proper skin preparation with antiseptic solutions. The use of sterile equipment and avoiding prolonged tourniquet application helps maintain the integrity of the blood specimen. Timely inoculation of blood into culture bottles and careful handling are essential to mitigate contamination risk.² Regular training and reinforcement of proper techniques is important to uphold the accuracy of blood culture results and enhance the reliability of diagnoses and treatment decisions.³ Despite diligent contamination prevention efforts, health care systems struggle to maintain contamination rates below the 3.0% national benchmark set by the Clinical & Laboratory Standards Institute (CLSI).⁴

Blood culture contamination is a critical concern in clinical practice; it can lead to misdiagnosis, prolonged hospital stays, unnecessary antibiotic use, and increased health care costs.⁵ Monitoring blood culture contamination is integral to patient safety, avoiding inappropriate and potentially harmful treatment, providing efficient care, contributing to antibiotic stewardship, supporting cost efficiency, and maintaining quality assurance and clinical research practices for public health.⁶

The initial specimen diversion technique (ISDT) recently emerged as a potential strategy to reduce blood culture contamination rates. This technique involves diverting a small portion of the initial blood plus the skin plug from the hollow needle away from the primary collection site before filling the culture bottles. This process minimizes skin surface contaminants, providing a cleaner blood specimen for culturing.⁷

The ISDT was introduced as a result of historically elevated contamination rates.⁸ Despite implementing various mitigation methods, the US Department of Veterans Affairs (VA) Central Texas Healthcare System (VACTHCS) has struggled to meet the national benchmark of maintaining blood culture contamination < 3.0%. The VACTHCS is a 146-bed teaching hospital with about 30,000 annual visits at the Olin E. Teague Veterans Affairs Medical Center (OETVMC) emergency department (ED). VACTHCS conducted a 16-month pilot study using 2 commercially available ISDT devices and published the findings.⁸

The Military Construction, Veterans Affairs, and Related Agencies Appropriations Act, 2022 (MilCon-VA Act) committee report prioritized the reduction of blood culture contamination to < 1% to prevent health risks and harm to veterans undergoing blood testing for the diagnosis of sepsis.⁹ Because it had been 5 years since OETVMC began using an ISDT in the ED, the ISDT adaptation strategy for mitigating blood culture contamination was revisited per institution policy.

The objective of this quality improvement project was to analyze retrospective data to understand the long-term impact of ISDT use on blood culture contamination rates. We hypothesized that ISDT use would contribute to efforts to maintain OETVMC ED blood culture contamination rate below the national (3.0%) and VACTHCS (2.5%) thresholds. This project assessed the progress for reducing blood culture contamination compared with the pre-ISDT era.⁸

METHODS

This retrospective analysis compared the blood culture contamination rates 36 months before and after the introduction of the ISDT device at the OETVMC ED. The preimplementation period was from December 2014 through November 2017 (36 months) and the postimplementation period was December 2017 through November 2020 (36 months). Data were collected from the Department of Pathology and Microbiology blood culture records of all adult patients admitted to the hospital through the ED and required blood cultures for suspicion of infection. Protected health information and VA sensitive information were not collected: all data were deidentified. A total of 18,541 blood cultures were collected 36 months preimplementation and 14,865 blood cultures were collected up to 36 months postimplementation. For comparison purposes, a similar dataset was collected from patients’ blood samples drawn by phlebotomists in the laboratory, where there had been no previous issues with overcontamination; no ISDT devices were used in the collection of these samples.

Blood Culture Contamination Variable

Blood cultures were monitored using the BACT/ALERT 3D (bioMérieux) and subsequently BACT/ALERT VIRTUO (bioMérieux), with positive bottles characterized by VITEK MS Matrix Assisted Laser Desorption Ionization Time-of-Flight technology (bioMérieux) and automated susceptibility testing (VITEK 2 [bioMérieux]).¹⁰ In an updated review of blood culture contamination, the American Society for Microbiology used the College of American Pathologists' Q-Probes quality improvement studies as a guideline for classifying contamination. A sample was determined to be contaminated if ≥ 1 of the following organisms were found in only 1 bottle in a series of blood culture sets: coagulase-negative staphylococci, Micrococcus species, α-hemolytic viridans group streptococci, Corynebacterium species, Propionibacterium acnes, and Bacillus species.¹¹ The contamination assessment criteria remained unchanged, except for use of an ISDT device in blood culture collection at the ED.

The VACTHCS Infection Prevention Department ensured that the ISDT device was available and that ED nurses were trained annually on its use to collect blood cultures. Monthly reports of contamination were sent to the nursing supervisor for corrective action and retraining. The initial performance improvement project was slated for 16 months but was expanded to a 6-year period of retrospective data to obtain strong correlation.

Statistical Analysis

Contamination rates were recorded monthly from the hospital laboratory information management system for 36 months both before and after ISDT adoption. Statistical analysis was performed using a 2-tailed unpaired t-test to compare monthly contamination rates for the 2 periods with GraphPad Prism version 10.0.0 for Windows.

RESULTS

Prior to 2017, the ED reported contamination rates above the national (3.0%) and OETVMC thresholds (2.5%), with a mean of 4.5% (95% CI, 3.90-4.90).⁸ After ISDT implementation, the ED showed significant improvement with a reduction to mean 2.6% (95% CI, 2.10-3.20) (P < .001) (Figure 1). Figure 2 shows monthly blood culture contamination rates at the ED from December 2014 through November 2020. Month 36 (November 2017) shows a clear dip in contamination rate when the ISDT was introduced and month 37 to month 44 show remarkably low contamination rates. During this time, the institute experimented with 2 ISDT devices, and closer scrutiny may reveal this period as an outlier due to the monitoring of ISDT application, as previously reported.⁸

The blood culture contamination rate for samples drawn by the phlebotomists in the laboratory (excluding the ED) was calculated during the same time period (Figure 3). Non-ED contamination rates remained below 2.5% for 69 of 72 months.

DISCUSSION

The blood culture contamination rate in the OETVMC ED dropped following ISDT implementation and continued to show long-term benefits. For the 36-month period following ISDT implementation, the mean contamination rate was 2.6%, which was below the national target threshold of 3.0% and close to the OETVMC target of 2.5%. These results suggest that ISDT can have a positive impact on patient care and laboratory efficiency. Improvements in the blood contamination rates in the ED can have a positive impact on the overall hospital contamination rates.

Blood drawn by phlebotomists in the hospital laboratory infrequently had contamination rates that exceeded the 2.5% target threshold. Because the non-ED contamination rates did not change throughout the comparison period, other factors were likely not involved in the improvements seen in the ED. The decision to implement ISDT exclusively in the ED was based on its historically elevated contamination rate.⁸ Issues with blood culture contamination in EDs across various hospital systems are well documented and not unique to VACTHCS.¹²

Contamination in blood cultures can be a significant issue in the hospital. It occurs when microorganisms from the skin or environment enter the blood culture sample during collection. Moreover, it can contribute to antibiotic resistance when patients are prescribed inappropriate antibiotics. It is also important to ensure HCPs are well-trained and consistently follow standardized protocols and understand the implications of false-positive results.¹³

ISDT helps reduce false-positive results and is a significant advancement in the field of blood culture collection.^8,14 By discarding the initial blood, it ensures that only the true bloodstream sample is cultured, leading to more accurate results.¹⁵ It also may minimize the risk of contamination-related delays in diagnosis and treatment and benefits patients and health care institutions by potentially reducing hospital stays, unnecessary antibiotic use, and health care costs.

One of the ISDT device manufacturers estimated the financial impact on OETVMC based on the pilot project.⁸ While this study did not calculate the direct and indirect cost savings associated with this process improvement, the manufacturer’s website suggests that VACTHCS could annually save about $486,000.¹⁶ Furthermore, implementation of ISDT may improve laboratory efficiency, as they reduce the workload associated with identifying and reporting false-positive cultures. ⁶ ISDT devices represent a valuable tool in the efforts to reduce blood culture contamination and its wide-ranging implications in clinical settings. While ISDT alone will not be sufficient in achieving a lower threshold (< 1%) of blood culture contamination, it can be part of a multiprong effort that optimizes best practices in the collection, handling, and management of blood cultures.

Continuous quality improvement efforts and monitoring of blood culture contamination rates can help health care institutions identify problem areas and implement necessary changes. Addressing blood culture contamination can improve patient care, reduce costs, and address antibiotic resistance.

Limitations

This study was limited by its study design, which did not use a side-by-side comparison of blood cultures from groups with and without ISDT. All blood cultures from patients in the region were processed at OETVMC, which may not be representative of non-VA EDs. Part of this study took place during the COVID-19 pandemic, which may have skewed data. Additionally, hospital data were collected from a veteran population in Central Texas, and the lack of demographic diversity may not be generalizable to the greater population.

CONCLUSIONS

The findings of this study suggest ISDT may be effective in reducing blood culture contamination rates in the high-risk ED environment, which aligns with previous research. ^5,14 The ISDT may help reduce blood culture contamination rates, improving the quality of patient care and reducing health care costs. MilCon-VA mandated that all VA facilities have blood culture contamination as a metric with a goal of blood culture contamination rates < 1%.⁸ However, achieving this goal remains a challenge. Further research and continuous quality improvement efforts are necessary to achieve it. Consistently achieving a contamination threshold of < 1% may require minimizing human error. An automated robotic venipuncture device, as recently designed and reported, may be necessary to reduce human error in blood draw and contamination.¹⁶

Blood cultures provide crucial evidence for diagnostic medicine, specifically aimed at identifying the presence of microbial infections in the bloodstream. Blood culturing is instrumental in diagnosing conditions such as sepsis, bacteremia, or fungemia, where the identification of the causative agent is necessary for targeted and effective treatment.¹

The process involves aseptically drawing blood into sterile culture bottles, minimizing the risk of contamination with well-established guidelines. These culture bottles contain specific growth media that support the replication of microorganisms if they are present. Once the blood specimen is collected, it incubates, allowing any potential pathogens to grow. Subsequent analysis and identification of these microorganisms enable health care professionals (HCPs) to prescribe appropriate antimicrobial therapies to treat specific infections, contributing to more effective and targeted patient care.²

The reliability of blood culture results depends on minimizing contamination risk, a challenge inherent in the procedure. Contamination can lead to false-positive results, potentially misguiding treatment.³ HCPs must adhere to strict aseptic techniques during blood draws, ensuring proper skin preparation with antiseptic solutions. The use of sterile equipment and avoiding prolonged tourniquet application helps maintain the integrity of the blood specimen. Timely inoculation of blood into culture bottles and careful handling are essential to mitigate contamination risk.² Regular training and reinforcement of proper techniques is important to uphold the accuracy of blood culture results and enhance the reliability of diagnoses and treatment decisions.³ Despite diligent contamination prevention efforts, health care systems struggle to maintain contamination rates below the 3.0% national benchmark set by the Clinical & Laboratory Standards Institute (CLSI).⁴

Blood culture contamination is a critical concern in clinical practice; it can lead to misdiagnosis, prolonged hospital stays, unnecessary antibiotic use, and increased health care costs.⁵ Monitoring blood culture contamination is integral to patient safety, avoiding inappropriate and potentially harmful treatment, providing efficient care, contributing to antibiotic stewardship, supporting cost efficiency, and maintaining quality assurance and clinical research practices for public health.⁶

The initial specimen diversion technique (ISDT) recently emerged as a potential strategy to reduce blood culture contamination rates. This technique involves diverting a small portion of the initial blood plus the skin plug from the hollow needle away from the primary collection site before filling the culture bottles. This process minimizes skin surface contaminants, providing a cleaner blood specimen for culturing.⁷

The ISDT was introduced as a result of historically elevated contamination rates.⁸ Despite implementing various mitigation methods, the US Department of Veterans Affairs (VA) Central Texas Healthcare System (VACTHCS) has struggled to meet the national benchmark of maintaining blood culture contamination < 3.0%. The VACTHCS is a 146-bed teaching hospital with about 30,000 annual visits at the Olin E. Teague Veterans Affairs Medical Center (OETVMC) emergency department (ED). VACTHCS conducted a 16-month pilot study using 2 commercially available ISDT devices and published the findings.⁸

The Military Construction, Veterans Affairs, and Related Agencies Appropriations Act, 2022 (MilCon-VA Act) committee report prioritized the reduction of blood culture contamination to < 1% to prevent health risks and harm to veterans undergoing blood testing for the diagnosis of sepsis.⁹ Because it had been 5 years since OETVMC began using an ISDT in the ED, the ISDT adaptation strategy for mitigating blood culture contamination was revisited per institution policy.

The objective of this quality improvement project was to analyze retrospective data to understand the long-term impact of ISDT use on blood culture contamination rates. We hypothesized that ISDT use would contribute to efforts to maintain OETVMC ED blood culture contamination rate below the national (3.0%) and VACTHCS (2.5%) thresholds. This project assessed the progress for reducing blood culture contamination compared with the pre-ISDT era.⁸

METHODS

This retrospective analysis compared the blood culture contamination rates 36 months before and after the introduction of the ISDT device at the OETVMC ED. The preimplementation period was from December 2014 through November 2017 (36 months) and the postimplementation period was December 2017 through November 2020 (36 months). Data were collected from the Department of Pathology and Microbiology blood culture records of all adult patients admitted to the hospital through the ED and required blood cultures for suspicion of infection. Protected health information and VA sensitive information were not collected: all data were deidentified. A total of 18,541 blood cultures were collected 36 months preimplementation and 14,865 blood cultures were collected up to 36 months postimplementation. For comparison purposes, a similar dataset was collected from patients’ blood samples drawn by phlebotomists in the laboratory, where there had been no previous issues with overcontamination; no ISDT devices were used in the collection of these samples.

Blood Culture Contamination Variable

Blood cultures were monitored using the BACT/ALERT 3D (bioMérieux) and subsequently BACT/ALERT VIRTUO (bioMérieux), with positive bottles characterized by VITEK MS Matrix Assisted Laser Desorption Ionization Time-of-Flight technology (bioMérieux) and automated susceptibility testing (VITEK 2 [bioMérieux]).¹⁰ In an updated review of blood culture contamination, the American Society for Microbiology used the College of American Pathologists' Q-Probes quality improvement studies as a guideline for classifying contamination. A sample was determined to be contaminated if ≥ 1 of the following organisms were found in only 1 bottle in a series of blood culture sets: coagulase-negative staphylococci, Micrococcus species, α-hemolytic viridans group streptococci, Corynebacterium species, Propionibacterium acnes, and Bacillus species.¹¹ The contamination assessment criteria remained unchanged, except for use of an ISDT device in blood culture collection at the ED.

The VACTHCS Infection Prevention Department ensured that the ISDT device was available and that ED nurses were trained annually on its use to collect blood cultures. Monthly reports of contamination were sent to the nursing supervisor for corrective action and retraining. The initial performance improvement project was slated for 16 months but was expanded to a 6-year period of retrospective data to obtain strong correlation.

Statistical Analysis

Contamination rates were recorded monthly from the hospital laboratory information management system for 36 months both before and after ISDT adoption. Statistical analysis was performed using a 2-tailed unpaired t-test to compare monthly contamination rates for the 2 periods with GraphPad Prism version 10.0.0 for Windows.

RESULTS

Prior to 2017, the ED reported contamination rates above the national (3.0%) and OETVMC thresholds (2.5%), with a mean of 4.5% (95% CI, 3.90-4.90).⁸ After ISDT implementation, the ED showed significant improvement with a reduction to mean 2.6% (95% CI, 2.10-3.20) (P < .001) (Figure 1). Figure 2 shows monthly blood culture contamination rates at the ED from December 2014 through November 2020. Month 36 (November 2017) shows a clear dip in contamination rate when the ISDT was introduced and month 37 to month 44 show remarkably low contamination rates. During this time, the institute experimented with 2 ISDT devices, and closer scrutiny may reveal this period as an outlier due to the monitoring of ISDT application, as previously reported.⁸

The blood culture contamination rate for samples drawn by the phlebotomists in the laboratory (excluding the ED) was calculated during the same time period (Figure 3). Non-ED contamination rates remained below 2.5% for 69 of 72 months.

DISCUSSION

The blood culture contamination rate in the OETVMC ED dropped following ISDT implementation and continued to show long-term benefits. For the 36-month period following ISDT implementation, the mean contamination rate was 2.6%, which was below the national target threshold of 3.0% and close to the OETVMC target of 2.5%. These results suggest that ISDT can have a positive impact on patient care and laboratory efficiency. Improvements in the blood contamination rates in the ED can have a positive impact on the overall hospital contamination rates.

Blood drawn by phlebotomists in the hospital laboratory infrequently had contamination rates that exceeded the 2.5% target threshold. Because the non-ED contamination rates did not change throughout the comparison period, other factors were likely not involved in the improvements seen in the ED. The decision to implement ISDT exclusively in the ED was based on its historically elevated contamination rate.⁸ Issues with blood culture contamination in EDs across various hospital systems are well documented and not unique to VACTHCS.¹²

Contamination in blood cultures can be a significant issue in the hospital. It occurs when microorganisms from the skin or environment enter the blood culture sample during collection. Moreover, it can contribute to antibiotic resistance when patients are prescribed inappropriate antibiotics. It is also important to ensure HCPs are well-trained and consistently follow standardized protocols and understand the implications of false-positive results.¹³

ISDT helps reduce false-positive results and is a significant advancement in the field of blood culture collection.^8,14 By discarding the initial blood, it ensures that only the true bloodstream sample is cultured, leading to more accurate results.¹⁵ It also may minimize the risk of contamination-related delays in diagnosis and treatment and benefits patients and health care institutions by potentially reducing hospital stays, unnecessary antibiotic use, and health care costs.

One of the ISDT device manufacturers estimated the financial impact on OETVMC based on the pilot project.⁸ While this study did not calculate the direct and indirect cost savings associated with this process improvement, the manufacturer’s website suggests that VACTHCS could annually save about $486,000.¹⁶ Furthermore, implementation of ISDT may improve laboratory efficiency, as they reduce the workload associated with identifying and reporting false-positive cultures. ⁶ ISDT devices represent a valuable tool in the efforts to reduce blood culture contamination and its wide-ranging implications in clinical settings. While ISDT alone will not be sufficient in achieving a lower threshold (< 1%) of blood culture contamination, it can be part of a multiprong effort that optimizes best practices in the collection, handling, and management of blood cultures.

Continuous quality improvement efforts and monitoring of blood culture contamination rates can help health care institutions identify problem areas and implement necessary changes. Addressing blood culture contamination can improve patient care, reduce costs, and address antibiotic resistance.

Limitations

This study was limited by its study design, which did not use a side-by-side comparison of blood cultures from groups with and without ISDT. All blood cultures from patients in the region were processed at OETVMC, which may not be representative of non-VA EDs. Part of this study took place during the COVID-19 pandemic, which may have skewed data. Additionally, hospital data were collected from a veteran population in Central Texas, and the lack of demographic diversity may not be generalizable to the greater population.

CONCLUSIONS

The findings of this study suggest ISDT may be effective in reducing blood culture contamination rates in the high-risk ED environment, which aligns with previous research. ^5,14 The ISDT may help reduce blood culture contamination rates, improving the quality of patient care and reducing health care costs. MilCon-VA mandated that all VA facilities have blood culture contamination as a metric with a goal of blood culture contamination rates < 1%.⁸ However, achieving this goal remains a challenge. Further research and continuous quality improvement efforts are necessary to achieve it. Consistently achieving a contamination threshold of < 1% may require minimizing human error. An automated robotic venipuncture device, as recently designed and reported, may be necessary to reduce human error in blood draw and contamination.¹⁶