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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.
Lip GY, Nieuwlaat R, Pisters R, Lane DA, Crijns HJ. Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation using a novel risk factor-based approach: the euro heart survey on atrial fibrillation. Chest. 2010 Feb;137(2):263-72. Epub 2009 Sep 17.
Olesen JB, Lip GY, Hansen ML, Hansen PR, Tolstrup JS, Lindhardsen J, Selmer C, Ahlehoff O, Olsen AM, Gislason GH, Torp-Pedersen C. Validation of risk stratification schemes for predicting stroke and thromboembolism in patients with atrial fibrillation: nationwide cohort study. BMJ. 2011 Jan 31;342:d124. doi: 10.1136/bmj.d124.
QxMD Cardiology contributing author: Dr. Jason Andrade, MD, FRCP(C)