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Anaphylaxis — MCCQE Part 1 MCQ

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HardDyspneaAnaphylaxisMCCQE Part 1

A 34-year-old woman develops wheeze, lip swelling, urticaria and hypotension 10 minutes after eating shellfish. Which of the following is the most appropriate next step?

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Correct answer: D — Give intramuscular epinephrine immediately

Give intramuscular epinephrine immediately is the single best answer because the age, timing, examination findings and investigations in the vignette fit Anaphylaxis better than the alternatives. The most tempting distractor is less appropriate because it either treats a neighbouring presentation, delays a time-critical intervention, or ignores a key discriminator in the stem. The remaining options are suboptimal because they would miss the diagnosis, use an investigation or treatment in the wrong sequence, or fail to address safety and follow-up. Canadian practice should be anchored to CSACI anaphylaxis guidance, with attention to acuity, safety-netting and local provincial pathways.

Reference: CSACI anaphylaxis guidance