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General Medicine · Critical care
Sample itemA man develops widespread urticaria, lip swelling, wheeze and hypotension within minutes of a wasp sting. Which is the single most important first drug?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
A. Intramuscular adrenaline
Airway swelling, bronchospasm and hypotension after an allergen exposure indicate anaphylaxis. Adrenaline given intramuscularly into the anterolateral thigh is the first-line, life-saving drug because it reverses vasodilatation, oedema and bronchospasm, and the other agents are adjuncts.
Option by option
A. Intramuscular adrenaline (correct)
Correct. Early intramuscular adrenaline is the cornerstone of anaphylaxis treatment.
B. Intravenous chlorpheniramine
Antihistamines relieve itching and urticaria but do not treat shock or airway obstruction.
C. Intravenous hydrocortisone
Hydrocortisone acts slowly and does not reverse the immediate life-threatening features.
D. Nebulised salbutamol
Salbutamol may help wheeze but does not treat hypotension or laryngeal oedema.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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