Atrial fibrillation scoring system for risk stratification and need for anticoagulation.
Risk of stroke in non-valvular atrial fibrillation at 1 year in non-anticoagulated patients (per the original 2009 study):
- Score 0 → 0%
- Score 1 → 0.6%
- Score 2 → 1.6%
- Score 3-6 → ~3%
- Score ≥7 → ≥ 8%
Per the 2014 AHA guidelines for Atrial Fibrillation:
- Score ≥ 2 → anticoagulant recommended
- Score 1 → antiplatelet or anticoagulant recommended
- Score 0 → antiplatelet or no antiplatelet/anticoagulant
Lip GY et al. 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; 137(2):263-72. Text
Okumura K et al. Validation of CHA2DS2-VASc and HAS-BLED scores in Japanese patients with nonvalvular atrial fibrillation: an analysis of the J-RHYTHM Registry. Circ J. 2014; 78(7):1593-9. Text