Idiopathic anaphylaxis: Diagnosis and management

Area of Science:

• Immunology
• Allergy
• Genetics

Background:

• Idiopathic anaphylaxis (IA) is a diagnosis of exclusion, challenging due to the inability to identify specific triggers.
• IA affects approximately 20% of the adult anaphylaxis population, often with comorbid atopic conditions.
• Advancements in diagnostics and understanding of related conditions are improving the accuracy of IA diagnosis.

Purpose of the Study:

• To review differential diagnoses for idiopathic anaphylaxis.
• To discuss current and potential management strategies for IA.
• To highlight the challenges in diagnosing and managing IA.

Main Methods:

• A comprehensive literature search was conducted.
• Databases used included PubMed, Google Scholar, and Embase.
• The review focused on differential diagnoses and management of IA.

Main Results:

• Key differential diagnoses for IA include galactose-alpha-1,3-galactose (alpha-gal) allergy and hereditary alpha-tryptasemia.
• Alpha-gal allergy presents as a delayed (3-6 hour) IgE-mediated reaction to red meat carbohydrates.
• Hereditary alpha-tryptasemia involves genetic variations (TPSAB1) leading to elevated serum tryptase.
• Acute IA management involves epinephrine autoinjectors; long-term management with antihistamines and biologics shows limited evidence.
• Biologics may offer a steroid-sparing approach, but further research is needed.

Conclusions:

• Diagnosing IA is complex due to a lack of specific criteria and challenges in differential diagnosis.
• Current treatment options for IA are limited, necessitating further research into effective therapies.
• Identifying specific triggers and conditions like alpha-gal allergy and hereditary alpha-tryptasemia is crucial for managing IA.