Paper I
2021 February (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Adrenaline in anaphylactic shock

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Answer

Adrenaline is the drug of choice in anaphylactic shock because it acts at multiple receptor sites simultaneously to reverse the life-threatening features of anaphylaxis: α1 action causes vasoconstriction, reversing hypotension and mucosal oedema; β1 action increases heart rate and contractility, supporting cardiac output; β2 action produces bronchodilatation, relieving bronchospasm, and stabilizes mast cells, reducing further mediator release. This combined effect addresses both the cardiovascular collapse and airway obstruction of anaphylaxis rapidly, unlike other drugs (antihistamines, corticosteroids), which are slower and only adjunctive.

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