Paper I
2025 August (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Low dose Aspirin.

Q33 marksShort Notes

Answer

Low-dose aspirin (75–150 mg/day) irreversibly acetylates and inhibits platelet cyclooxygenase-1, blocking thromboxane A2 synthesis for the entire lifespan of the platelet, while relatively sparing endothelial COX-mediated prostacyclin production — a net antiplatelet effect distinct from aspirin’s higher-dose analgesic/anti-inflammatory action.

Uses: secondary prevention of myocardial infarction and ischemic stroke, primary prevention in high-risk individuals, acute coronary syndrome (given immediately, chewed for rapid absorption).

Adverse effects: increased bleeding risk, GI irritation/peptic ulceration (though lower risk than analgesic doses), rare hypersensitivity.

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