CHADS2 schema for selecting antithrombotic therapy in non-valvular atrial fibrillation

Risk factor

Points

Congestive heart failure

Hypertension

Age ≥ 75 years

Diabetes mellitus

Stroke (prior stroke or TIA)

1

1

1

1

2

Adapted from: Gage BF, Waterman AD, Shannon W, et al. Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation. JAMA 2001;285:2864–70.