By clicking on the “Submit” button below, you acknowledge that you have read, understand, and agree to be bound by the terms of the QxMD Online Calculator End User Agreement.
Use this calculator to calculate CHA2DS2-VASc score and risk of stroke in atrial fibrillation.
About this calculator
The CHA2DS2-VASc score can be considered an extension of the CHADS2 schema by considering additional stroke risk factors that may influence a decision whether or not to anticoagulate. When compared to the CHADS2 score, CHA2DS2-VASc performed better in predicting patients at high risk, and those categorised as low risk by CHA2DS2-VASc were truly at low risk for thromboembolism.
Warfarin anticoagulation titrated to an INR of 2.0-3.0 is recommended for the average patient with a CHA2DS2-VASc score ≥2 unless contraindicated (e.g., history of frequent falls, clinically significant bleeding, inability to obtain regular INR). Either Warfarin or Aspirin can be used for the average patient with a CHA2DS2-VASc score of 1 depending on physician discretion and patient preference. Aspirin 325 mg daily is recommended for the average patient with a CHA2DS2-VASc score of 0.
QxMD Cardiology contributing author: Dr. Jason Andrade, MD, FRCP(C)