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CHADS2 system which relies on scoring individual risk factors to assess overall thromboembolic risk.
| congestive cardiac failure | +1 |
| hypertension | +1 |
| age 75 or greater than 75 yrs old | +1 |
| diabetes mellitus | +1 |
| previous history of arterial thromboembolism, e.g. stroke | +2 |
