No risk factors | | Aspirin 81–325 mg/day |
One moderate-risk factor | | Aspirin 81–325 mg/day or warfarin (target international normalised ratio 2.5; range 2.0–3.0) |
Any high-risk factor or one risk factor | | Warfarin (target international normalised ratio 2.5; range 2.0–3.0) |
Less validated or weaker risk factors | Moderate-risk factors | High-risk factors |
Female sex | Age ≥75 years | Previous stroke, transient ischaemic attack or embolism |
Age 65–74 years | Hypertension | |
Coronary artery disease | Heart failure | Mitral stenosis |
Thyrotoxicosis | Left ventricular dysfunction ≤35% diabetes mellitus | Prosthetic heart valve |