Thrombotic risk | |||
---|---|---|---|
High | Moderate | Low | |
Mechanical heart valve |
| Bi-leaflet aortic valve and one of the following:
|
|
Atrial fibrillation |
| CHADS score of 3 or 4 | CHADS score 0–2 (no previous TIA/Stroke) |
Venous thromboembolism |
|
| Single VTE >12 months ago and no other risk factors |
AF = atrial fibrillation; CHADS = congestive cardiac failure, hypertension, age of 75 years or older, diabetes or previous stroke or TIA; TIA = transient ischaemic attack; VTE = venous thromboembolism.
Adapted with permission from Douketis et al.33