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CHADS₂ is a scoring system used for estimating ischaemic stroke risk in patients with atrial fibrillation.
- 0: no prophylaxis / aspirin (0.6% risk)
- 1: aspirin / warfarin (3% risk)
- ≥2: warfarin (>5% risk)
Gage BF et al. Selecting Patients With Atrial Fibrillation for Anticoagulation: Stroke Risk Stratification in Patients Taking Aspirin. Circulation. 2004; 110: 2287-2292.Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ. Validation of Clinical Classification Schemes for Predicting Stroke: Results From the National Registry of Atrial Fibrillation.