Revised Cardiac Risk Index (RCRI) — Lee Index

A validated 6-variable prediction rule for estimating the risk of major adverse cardiac events (MACE) in patients undergoing non-cardiac surgery. The RCRI (Lee Index) is the most widely used perioperative cardiac risk stratification tool, endorsed by ACC/AHA guidelines. It identifies patients who may benefit from cardiology evaluation, preoperative cardiac testing, or beta-blocker initiation before surgery.