The impact of genetic polymorphisms and patient characteristics on warfarin dose requirements: a cross-sectional study in Iran

Clinical Therapeutics
Soha NamaziAhmad Reza Mehdipour

Abstract

Warfarin is the most commonly prescribed oral anticoagulant drug for prophylaxis and treatment of venous and arterial thromboembolic disorders. Its anticoagulant effect is widely variable between patients because of pharmacodynamic, pharmacokinetic, and pharmacogenetic factors. This study was conducted to identify the associations between demographic characteristics, warfarin maintenance dose, and genetic polymorphisms of cytochrome P450 (CYP) 2C19, CYP2C9, and vitamin K epoxide reductase complex subunit 1 (VKORC1). This study was conducted from April 2005 to April 2008 at 3 warfarin clinics affiliated with Shiraz University of Medical Sciences. Blood samples were collected from patients with stable warfarin maintenance dose and a stable target international normalized ratio of 2 to 3. Patients who had a condition (including use of an interacting medication) affecting the metabolism of warfarin were excluded. CYP2C9, CYP2C19, and VKORC1 genotyping was performed by polymerase chain reaction-restriction fragment length polymorphism. The associations between demographic characteristics (eg, age, sex, body surface area, weight, height), genetic factors, and maintenance warfarin dose were examined by multiple linear regression. The ...Continue Reading

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