Paper I
2022 May (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Vitamin K in warfarin toxicity

Q101 marksShort Answers

Answer

Warfarin inhibits vitamin K epoxide reductase, blocking the vitamin K-dependent gamma-carboxylation (hepatic activation) of clotting factors II, VII, IX, and X. Vitamin K is the antidote in warfarin toxicity because it restores the substrate needed for this activation step, allowing synthesis of functional clotting factors to resume — reversing the coagulopathy. Onset takes several hours to days (new factor synthesis is required), so fresh frozen plasma or prothrombin complex concentrate is added for immediate reversal in severe bleeding.

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