Risk factor	Points
Cerebrovascular disease	1
Congestive heart failure	1
Creatinine level > 2.0 mg per dL (176.80 μmol per L)	1
Diabetes mellitus requiring insulin	1
Ischemic cardiac disease	1
Suprainguinal vascular surgery, intrathoracic surgery, or intra-abdominal surgery	1
Total points: