CHA2DS2-VASc Score

A higher score indicates a higher annual risk of stroke in AFib patients. Score 0 = low risk (about 0% per year), score 1 = low-moderate (about 1.3%), score 2 = moderate (about 2.2%). Scores of 2 or more usually warrant anticoagulation.

C = Congestive heart failure (1 pt), H = Hypertension (1 pt), A2 = Age 75 or older (2 pts), D = Diabetes mellitus (1 pt), S2 = Stroke, TIA, or thromboembolism (2 pts), V = Vascular disease (1 pt), A = Age 65-74 (1 pt), Sc = Sex category female (1 pt).

Includes prior heart attack (MI), peripheral artery disease (PAD), or aortic plaque.

It is specifically validated for non-valvular atrial fibrillation. Patients with rheumatic mitral stenosis or mechanical heart valves require different risk assessment approaches.

Generally no. The female sex point alone, with no other risk factors, is considered low risk. Guidelines recommend anticoagulation when additional risk factors bring the total to 2 or higher.

No. This tool provides educational estimates of stroke risk. All decisions about anticoagulation therapy should be made by a qualified healthcare provider in conjunction with bleeding risk assessment (HAS-BLED score).

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