Anaphylaxis Uncertainty Persists for Patients and Professionals

Misinformation and outdated protocols contribute to the suboptimal management of anaphylaxis by patients and healthcare professionals, based on data from two new studies presented at the American College of Allergy, Asthma and Immunology Annual Scientific Meeting.

Anaphylaxis can strike suddenly, and many patients and caregivers at risk do not know which symptoms to treat with epinephrine, said Joni Chow, DO, of Baylor College of Medicine, San Antonio, Texas, in her presentation at the meeting.

“Early identification of anaphylaxis and early intervention with epinephrine are critical for improving patient outcomes,” Chow said in an interview.

“Many allergic reactions occur in community settings, where written action plans serve to instruct patients and caregivers on how to recognize and respond to these emergencies,” she said. “Currently, anaphylaxis action plans are developed based on the consensus of healthcare professionals, with limited information available on the preferences of patients and caregivers,” she noted. However, even with action plans, many patients and families struggle to recognize and manage severe allergic reactions effectively, she added.

In response to this issue, Chow and colleagues created a survey designed to assess the understanding of anaphylaxis recognition and management by patients and caregivers and to identify their preferences regarding the elements included in the action plans.

In the study, Chow and colleagues surveyed 96 patients and caregivers in an allergy clinic waiting room. The majority (95%) of the patients were prescribed epinephrine. Although 73% said they were comfortable identifying signs of anaphylaxis, only 14% said they were likely to use epinephrine as a first-line treatment.

The most common reason given for avoiding epinephrine was uncertainty over which symptoms to treat (40.6%), followed by hesitancy to visit an emergency department (24%), hesitancy to call 911 (17.7%), uncertainty about how to use epinephrine auto-injectors (11.5%), and fear of needles (5.2%).

Although 85% of the respondents understood that antihistamine use does not prevent the need for epinephrine in cases of anaphylactic reactions, 23.7% said they would use an antihistamine as the first treatment in these cases.

For patients with rash and wheezing after a suspected allergen exposure, approximately two thirds (64.5%) of the respondents said they would inject epinephrine and 10.8% would drive to the emergency room before taking any action, Chow said in her presentation.

The relatively low impact of fear of needles was unexpected, as fear of needles is considered a significant deterrent to epinephrine use, Chow told MedscapeMedical News. “However, our respondents were more inclined to acknowledge a reluctance to escalate to emergency response as the major barrier to treatment,” she said.

The survey also asked patients what features of an anaphylaxis action plan would be most helpful. A majority of respondents (93%) rated a section for the management of mild (non-anaphylactic) allergic reaction symptoms as somewhat or very important. Visual aids for injection of epinephrine and visuals of anaphylaxis symptoms also ranked as somewhat or very important for 87.6% and 81% of respondents, respectively.

The study highlights the importance of educating allergy patients on recognizing and treating anaphylaxis and demonstrates that visuals were preferred in this survey population, Chow said. “Most patients and caregivers from our surveyed population report knowing how to treat anaphylaxis, but many would not use epinephrine as the first treatment,” she noted.

“The study focused on a single community clinic, and it would be beneficial to gather feedback from patients and caregivers representing a wider variety of educational, cultural, social, and socioeconomic backgrounds,” Chow told MedscapeMedical News. “Additionally, input from other stakeholders, such as school nurses, would enhance knowledge,” she said.

Clinical Anaphylaxis Protocols Fall Short

A second study presented at the meeting showed the need to improve anaphylaxis education for clinicians.

Discrepancies in anaphylaxis management include variations in the definition and treatment of the condition, according to Carly Gunderson, DO, of Memorial Healthcare System, Pembroke Pines, Florida, who presented the study at the meeting.

“So often, we see patients in our office with a history of symptoms that meet criteria for anaphylaxis, yet when they call 911 and emergency medical services (EMS) arrive, they never receive epinephrine,” Gunderson said in an interview. “They receive antihistamines, steroids, everything except epinephrine, which is incredibly concerning given that epinephrine is always the first-line treatment for anaphylaxis,” she said.

“Because EMS providers are often the first healthcare professionals to assess patients experiencing anaphylaxis, their ability to recognize and appropriately treat anaphylaxis is essential,” Gunderson emphasized.

Gunderson and colleagues analyzed data from 30 states with mandatory Advanced Cardiac Life Support protocols to identify gaps in recognizing anaphylaxis and areas for improvement in prehospital management.

Only 15 states (50%) included gastrointestinal symptoms in the definition of anaphylaxis, 40% included neurologic manifestations, and 47% used a two-organ system definition, Gunderson noted in her presentation.

All 30 state protocols recommended diphenhydramine and epinephrine for anaphylactic reactions, 90% recommended albuterol if respiratory symptoms were present, 73% recommended intravenous fluids, and 60% recommended steroids. All but one of the state protocols listed epinephrine as the first-line recommendation for anaphylaxis; 25 states allowed epinephrine autoinjectors and 17 provided autoinjectors.

“We were shocked by how many protocols didn’t include gastrointestinal (abdominal pain, vomiting) or neurologic (lethargy, altered mental status) manifestations, when these are common presenting symptoms of anaphylaxis,” Gunderson told MedscapeMedical News.

“We were also disappointed by how many protocols continue to recommend outdated interventions such as first-generation antihistamines and corticosteroids in the treatment of anaphylaxis,” she said.

Although anaphylaxis management has come a long way, the current study suggests that there is clearly room for improvement in the education of healthcare providers on how to identify and treat anaphylaxis, said Gunderson. “Most people think of anaphylaxis as the typical ‘face swelling up, throat closing’ type of reaction, which it can be, but in reality, there are so many other ways that it can present,” she said. “Healthcare providers must be aware of all of these possible manifestations so that we can treat in a timely manner to improve outcomes,” she added.

Limitations of the study included the focus only on states with mandatory or model EMS protocols, Gunderson told MedscapeMedical News. As for additional research, the most important next steps are practical ones, namely, identifying ways to realistically implement necessary protocol changes, she said.

Real-World Data Support Need for Education

Real-world studies are important to identify current practice and opportunities for improvement, said S. Shahzad Mustafa, MD, lead physician in allergy, immunology, and rheumatology at Rochester Regional Health and clinical associate professor of medicine at the University of Rochester School of Medicine and Dentistry, Rochester, New York, in an interview.

“Management of anaphylaxis continues to evolve, and studies like these can help standardize evidence-based care across different medical settings, such as emergency medical services, urgent care, and emergency departments,” said Mustafa. Mustafa was not involved in either study.

The findings of the two studies were not unexpected, Mustafa said. “Heterogeneity in medical care is well recognized in numerous conditions, and anaphylaxis is no different. Patients and healthcare providers continue to have hesitation to use epinephrine and continue to overly rely on antihistamines and/or systemic steroids,” he noted.

For both studies, the takeaway message is that education is paramount to optimize anaphylaxis management, Mustafa told Medscape Medical News. “Education needs to focus on timely recognition of anaphylaxis, including atypical features such as gastrointestinal symptoms, and appropriate therapy with epinephrine,” he said.

Looking ahead, “research demonstrating differences in clinical outcomes with differing approaches to anaphylaxis may highlight the importance of early recognition and treatment with epinephrine,” said Mustafa. Management of anaphylaxis also lends itself to quality improvement studies, he added.

Neither of the studies received any outside funding. The researchers had no financial conflicts to disclose. Mustafa had no disclosures related to anaphylaxis but disclosed serving on the speakers’ bureau for Genentech, GSK, AstraZeneca, Regeneron/Sanofi, and CSL Behring and received grants from Takeda.

Heidi Splete is a Bethesda, Maryland-based freelance medical writer.