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Updated: Jun 10, 2026

The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation
Published on: February 28, 2012
[Warfarin hipersensitivity: how to deal with it?]
Ana Furtado Lima1, José Reis, Fátima Serrano
1Serviço de Medicina Materno-Fetal, Maternidade Dr. Alfredo da Costa, Lisboa.
This case study highlights warfarin hypersensitivity in a patient with specific VKORC1 and CYP2C9 genetic variations. Understanding pharmacogenetics can prevent adverse drug reactions to warfarin.
Area of Science:
- Pharmacogenetics
- Clinical Case Reports
- Drug Metabolism
Background:
- Warfarin is a common anticoagulant used for thromboembolic risk.
- Genetic variations can significantly influence warfarin efficacy and safety.
- VKORC1 and CYP2C9 gene polymorphisms are key determinants of warfarin response.
Observation:
- A patient with thromboembolic risk developed warfarin hypersensitivity.
- The patient was found to be heterozygous for VKORC1 -1639G>A.
- The patient was homozygous for CYP2C9*3/*3 genotype.
Findings:
- Specific genetic polymorphisms in VKORC1 and CYP2C9 are associated with warfarin hypersensitivity.
- CYP2C9*3/*3 genotype significantly impacts warfarin metabolism.
- VKORC1 -1639G>A polymorphism affects warfarin pharmacodynamics.
Implications:
- Investigating genetic polymorphisms can help predict and prevent warfarin-induced hypersensitivity.
- Personalized medicine approaches using pharmacogenetics can optimize warfarin therapy.
- Understanding warfarin pharmacodynamics and Vitamin K interaction is crucial for safe anticoagulation.
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