Table 2. Revised Cardiac Risk Index (Lee criteria) risk factors (points) for severe cardiac events.

Risk factor			Points
Coronary heart disease			1
High-risk operation			1
Heart failure			1
Cerebrovascular disease			1
Insulin-dependent diabetes mellitus			1
Serum creatinine concentration > 2 mg/dL			1
Risk of severe cardiac events
Points	Class	Risk
0	I	0.4%
1	II	0.9%
2	III	6.6%
≥ 3	IV	11.0%