Anaphylaxis: Epidemiology and Differential Diagnosis

Area of Science:

• Allergy and Immunology
• Emergency Medicine
• Clinical Practice Guidelines

Background:

• Anaphylaxis-related emergency department visits and hospitalizations show an increasing trend.
• Common anaphylaxis triggers include foods, medications, and insect stings.
• Idiopathic anaphylaxis represents a significant portion of cases, with novel allergens like galactose-α-1,3 galactose leading to reclassification.

Purpose of the Study:

• To review current understanding and management of anaphylaxis.
• To highlight the increasing incidence of anaphylaxis and evolving diagnostic criteria.
• To summarize updated recommendations for preventing biphasic reactions.

Main Methods:

• Review of recent anaphylaxis literature and clinical practice guidelines.
• Analysis of trends in emergency department visits and hospitalizations for anaphylaxis.
• Synthesis of expert recommendations on anaphylaxis management.

Main Results:

• Idiopathic anaphylaxis diagnosis is evolving with the identification of new allergens.
• Galactose-α-1,3 galactose is a notable novel allergen contributing to anaphylaxis reclassification.
• Updated guidelines advise against routine systemic corticosteroids and antihistamines for biphasic reaction prevention.

Conclusions:

• Extended observation (up to 6 hours) is recommended for patients at risk of biphasic anaphylaxis.
• This includes individuals with risk factors and limited access to epinephrine or emergency medical services.
• Management strategies are shifting towards more targeted observation and away from routine prophylactic medications.