Abstract
Genetic warfarin resistance is rare and mainly associated with two genes encoding CYP2C9 and VKORC1.In addition to dietary counselling and drug compliance, options in warfarin-resistant patients include increasing the warfarin dose, which carries a risk of bleeding complications, or switching to novel oral anticoagulants, which increases the risk of prosthetic valve thrombosis.We replaced a metallic valve with a bioprosthetic valve, which is the first time this has been documented in a patient with warfarin resistance.
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