Anaphylaxis — MCCQE Part 1 MCQ

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EasyAllergic ReactionAnaphylaxisMCCQE Part 1

A 35-year-old woman has anaphylaxis after wasp sting: urticaria, wheeze, stridor, BP 70/40. Most appropriate first intervention?

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Correct answer: A — IM epinephrine 0.5 mg into lateral thigh

Anaphylaxis: IM epinephrine first-line, every time, without delay. Anterolateral thigh preferred (better absorption). Can repeat q5-15 min. Adjuncts: IV fluids, antihistamines, steroids. All patients: observe 4-6h, prescribe EpiPen, refer for allergy testing.

Reference: Canadian Allergy/Immunology / CSACI