High risk | Moderate risk | Low risk | |
---|---|---|---|
Untreated patients | |||
Atrial Fibrillation Investigators (1994)11 | Age ⩾ 65 years History of hypertension Diabetes Prior stroke/TIA | Age < 65 years No high risk features | |
Observed stroke rate | 5.1%/year | NA | 1.0%/year |
American College of Chest Physicians Consensus (1998)14 | Age > 75 years History of hypertension Prior stroke/TIA Left ventricular dysfunction2-150 > 1 moderate risk factor | Age 65-75 years Diabetes Coronary disease Thyrotoxicosis | Age < 65 years No risk factors |
Observed stroke rate | NA | NA | NA |
Aspirin treated patients | |||
Stroke Prevention in Atrial Fibrillation (1995)12 | Women > 75 years Systolic BP > 160 mm Hg Prior stroke/TIA Left ventricular dysfunction2-151 | History of hypertension No high risk features | No high risk features No history of hypertension |
Observed stroke rate | 7.7%/year | 3.6%/year | 1.1%/year |
SPAF Exploratory Analysis (1999)13 | Women > 75 years Systolic > 160 mm Hg Hypertension plus age > 75 Prior stroke/TIA | Hypertension and age ⩽ 75 years Diabetes No high risk features | No high or moderate risk features |
Observed stroke rate | 7.1%/year | 2.6%/year | 0.9%/year |