Related Experiment Video
Updated: Mar 24, 2026
23:33
The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation
Published on: February 28, 2012
84.7K
Development and Comparison of Warfarin Dosing Algorithms in Stroke Patients
Sun-Mi Cho1, Kyung-Yul Lee2, Jong Rak Choi3
1Department of Laboratory Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
Yonsei Medical Journal
|March 22, 2016
Summary
A new warfarin dosing algorithm was developed for Korean stroke patients using genetic factors like CYP2C9 and VKORC1. This pharmacogenetic approach improves warfarin dose prediction accuracy in this population.
Area of Science:
- Pharmacogenetics
- Clinical Pharmacology
- Stroke Management
Background:
- Warfarin dosing is influenced by genetic factors, specifically cytochrome P450 2C9 (CYP2C9) and vitamin K epoxide reductase complex subunit 1 (VKORC1).
- Accurate warfarin dosing is critical for stroke patients to prevent thromboembolic events and bleeding.
Purpose of the Study:
- To develop and validate a warfarin dosing algorithm for Korean stroke patients incorporating pharmacogenetic information.
- To compare the predictive accuracy of the developed algorithm against existing methods.
Main Methods:
- A cohort of 101 Korean patients on stable warfarin maintenance doses was studied.
- A multiple linear regression model was used to develop the warfarin dosing algorithm, including age, body weight, and CYP2C9/VKORC1 genotypes.
- Algorithm performance was assessed using coefficient of determination, mean percent deviation, and percentage of predicted doses within ±20% of actual doses.
Main Results:
- The developed pharmacogenetic algorithm explained 51% of the variation in stable warfarin dose.
- The algorithm demonstrated the best performance in predicting doses within 20% of the actual dose, particularly in the intermediate-dose group.
Conclusions:
- The developed warfarin dosing algorithm shows potential utility for optimizing warfarin therapy in Korean stroke patients.
- Further research is needed to confirm the clinical utility of genotype-guided warfarin dosing and identify additional genetic associations.
Related Concept Videos
01:18Anticoagulant Drugs: Vitamin K Antagonists and Direct Oral Anticoagulants
2.7K
Oral anticoagulants are vital tools in preventing and treating blood clotting disorders. This diverse class of medications can be categorized as vitamin K antagonists, exemplified by warfarin, and direct thrombin inhibitors (DTIs), such as dabigatran, as well as factor Xa inhibitors, including rivaroxaban.
Warfarin, a prominent vitamin K antagonist family member, exerts its effect by inhibiting the enzyme VKORC1 (vitamin K epoxide reductase complex 1). By hindering this enzyme, warfarin...
Warfarin, a prominent vitamin K antagonist family member, exerts its effect by inhibiting the enzyme VKORC1 (vitamin K epoxide reductase complex 1). By hindering this enzyme, warfarin...
2.7K
01:29Venous Thrombosis III: Interprofessional Care
459
Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...
459
01:30Anticoagulant Drugs: Low-Molecular-Weight Heparins
2.3K
Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
2.3K
01:25Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant
301
In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
301
01:30Venous Thrombosis IV: Nursing Management
366
Nursing management begins with a thorough assessment of the patient's health history. Key factors include trauma to veins, peripherally inserted central catheters, varicose veins, recent pregnancy or childbirth, surgery, bacteremia, prolonged bed rest, atrial fibrillation, COPD, heart failure, cancer, coagulation disorders, myocardial infarction, spinal cord injury, stroke, prolonged travel, recent bone fractures, and dehydration. Review medication intake, particularly oral contraceptives,...
366
01:15Drug Dosing: Geriatric Patients
345
Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
345