Lee's Criteria: predicts Major Adverse Cardiac Events (MACE) after non-cardiac surgery
Total Score
RCRI 0 — Estimated MACE risk: ~0.4%. Very low cardiac risk. No further cardiac testing required before low-to-intermediate-risk surgery. Proceed with standard anaesthetic assessment.
Disclaimer: The clinical scoring and algorithms on this platform are intended strictly for professional informational purposes. They do not constitute a definitive medical diagnosis, treatment, or clinical decision. The final judgment and responsibility lie with the treating physician.
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The Revised Cardiac Risk Index (RCRI), also known as Lee's Criteria (Lee et al., Circulation 1999), is the most widely validated bedside scoring tool for pre-operative cardiac risk stratification before non-cardiac surgery. It identifies six independent risk factors (high-risk surgery, ischemic heart disease, CHF, cerebrovascular disease, pre-operative insulin therapy, pre-operative creatinine > 2.0 mg/dL), each contributing 1 point. It is the primary risk stratification tool in both the 2014 ACC/AHA and 2022 ESC guidelines on perioperative cardiovascular evaluation.
Functional capacity is the critical modifier the RCRI alone cannot capture. An RCRI-2 patient who can climb two flights of stairs without symptoms (≥ 4 METs) carries substantially lower realized cardiac risk than an RCRI-2 patient who is bed-bound. The ACC/AHA perioperative algorithm explicitly asks whether functional capacity is adequate (≥ 4 METs) as the branch point before recommending further cardiac testing — excellent functional status can safely defer stress testing even in patients with elevated RCRI scores.
Lee TH, Marcantonio ER, Mangione CM, et al. Derivation and prospective validation of a simple index for prediction of cardiac risk of major noncardiac surgery. Circulation. 1999;100(10):1043-1049. doi:10.1161/01.CIR.100.10.1043. PMID: 10477528
Fleisher LA, Fleischmann KE, Auerbach AD, et al. 2014 ACC/AHA guideline on perioperative cardiovascular evaluation and management of patients undergoing noncardiac surgery. Circulation. 2014;130(24):2215-2245. doi:10.1161/CIR.0000000000000106. PMID: 25085962
Disclaimer: The clinical scoring and algorithms on this platform are intended strictly for professional informational purposes. They do not constitute a definitive medical diagnosis, treatment, or clinical decision. The final judgment and responsibility lie with the treating physician.
Apply to all adult patients scheduled for elective non-cardiac surgery as the first step in pre-operative cardiac risk stratification, per ACC/AHA 2014 and ESC 2022 guidelines. The RCRI guides whether further cardiac testing (stress test, echocardiography) is warranted — it does not replace clinical judgment or cardiology consultation in complex cases. Do not apply to emergency surgery, where the risk-benefit calculus is determined by the urgency of the operation.
Functional capacity is a critical modifier that the RCRI alone cannot capture. A patient with an RCRI of 2 who can climb two flights of stairs without symptoms (> 4 METs) has a substantially lower realized risk than an RCRI 2 patient who is functionally limited. The ACC/AHA algorithm explicitly asks whether functional capacity is adequate (≥ 4 METs) before recommending further testing — excellent functional status can safely defer stress testing even in elevated-RCRI patients.
The RCRI was derived from a single academic center with a specific case mix (mostly elective surgery). It may underestimate risk in vascular surgery populations and in emergency procedures. For patients undergoing major vascular surgery, the Vascular Quality Initiative (VQI) Cardiac Risk Index or the NSQIP MICA calculator may provide better calibration than the RCRI.