CHA2DS2-VASc Score Calculator for Atrial Fibrillation Stroke Risk

Key points

• The CHA₂DS₂-VASc score estimates annual stroke risk in non-valvular atrial fibrillation using 8 clinical factors.

• Use results to inform anticoagulation discussions alongside bleeding risk, patient preferences, and guideline recommendations.

Rundown

1. Select applicable risk factors (age, CHF/LV dysfunction, hypertension, diabetes, prior stroke/TIA, vascular disease, sex).

2. Click Calculate → the tool summarizes the total score and general risk category.

3. Click Copy results to paste into the note or patient message.

Interpretation

• Higher scores indicate greater annual stroke risk.

• Typical clinical use: weigh anticoagulation benefits vs. bleeding risk and patient values.

• Scores are estimates, not diagnoses. Always interpret with clinical context (valvular disease, transient AF, reversible triggers, frailty).

Limitations & caveats

• Not validated for moderate-to-severe mitral stenosis or mechanical valves.

• Stroke risk is continuous; categories simplify a continuum.

• Consider parallel bleeding risk assessment and comorbidities.

Next steps

• Discuss shared decision-making for anticoagulation.

• Optimize BP, diabetes, lipids, and lifestyle risk factors.

• Reassess periodically as risk factors change.

Evidence

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. doi: 10.1378/chest.09-1584. Epub 2009 Sep 17. PMID: 19762550.