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Idiopathic anaphylaxis.

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    Idiopathic anaphylaxis (IA) is a diagnosis of exclusion presenting with anaphylaxis symptoms without a clear trigger. Frequent IA episodes may require prednisone, while all patients need epinephrine for self-administration.

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    Area of Science:

    • Allergy and Immunology
    • Clinical Medicine
    • Emergency Medicine

    Background:

    • Idiopathic anaphylaxis (IA) is defined as anaphylaxis without an identifiable cause.
    • Clinical presentation mirrors allergen-induced anaphylaxis, including urticaria, angioedema, and hypotension.
    • IA is a diagnosis of exclusion, often requiring differentiation from other conditions.

    Purpose of the Study:

    • To define idiopathic anaphylaxis and its characteristics.
    • To outline diagnostic considerations and differential diagnoses for IA.
    • To establish classification and management strategies based on IA frequency.

    Main Methods:

    • Review of clinical manifestations and diagnostic criteria for IA.
    • Differential diagnosis exploration, including indolent systemic mastocytosis and other conditions.
    • Classification of IA into frequent (IA-F) and infrequent (IA-I) based on episode frequency.

    Main Results:

    • IA presents with diverse symptoms, consistent with known anaphylaxis triggers.
    • Elevated serum tryptase acutely suggests anaphylaxis but may indicate other disorders if persistently elevated.
    • Urticaria presence aids in differentiating IA from mimic disorders, except indolent systemic mastocytosis.

    Conclusions:

    • IA requires a thorough diagnostic workup to exclude other causes.
    • Classification into IA-F and IA-I guides initial therapeutic decisions, with IA-F often necessitating prednisone.
    • All patients diagnosed with IA must be educated on epinephrine self-administration.