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Anaphylaxis — SCE Acute Medicine MCQ

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EasyOtherAnaphylaxisSCE Acute Medicine

A 34-year-old man with known peanut allergy eats a takeaway and develops wheeze, throat tightness and generalised urticaria. Observations show RR 30/min, SpO2 91% on air, pulse 132/min and BP 82/46 mmHg. He is anxious and has a hoarse voice. What is the most important immediate action?

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Correct answer: C — Give intramuscular adrenaline 500 micrograms into the anterolateral thigh

Airway, breathing and circulatory compromise after allergen exposure indicates anaphylaxis. The immediate treatment is IM adrenaline 500 micrograms in adults into the anterolateral thigh, with repeat dosing if needed. Antihistamines and steroids are adjuncts and should not delay adrenaline; IV adrenaline is reserved for experienced clinicians in monitored specialist settings.

Reference: Resuscitation Council UK Anaphylaxis Guidance