Calculate RCRI (Lee Index) for perioperative cardiac risk stratification. Estimates major adverse cardiac event probability before non-cardiac surgery using 6 clinical predictors.
The Revised Cardiac Risk Index (RCRI), also known as the Lee Index, is the most widely used clinical tool for predicting major adverse cardiac events (MACE) in patients undergoing non-cardiac surgery. Published by Thomas H. Lee and colleagues in 1999, it simplified perioperative risk assessment to just six binary clinical predictors.
Each predictor present adds one point to the score, yielding RCRI classes I through IV with progressively higher MACE rates — from 3.9% with zero risk factors to 15% or more with three or more. MACE in this context includes myocardial infarction, pulmonary edema, ventricular fibrillation or cardiac arrest, and complete heart block.
The RCRI is central to the ACC/AHA Perioperative Cardiovascular Evaluation guidelines and directly informs decisions about proceeding to surgery, ordering further cardiac testing, or initiating perioperative beta-blocker therapy. Its simplicity (six yes/no questions) makes it practical for use by surgeons, anesthesiologists, internists, and nurse practitioners during preoperative clinic visits.
Perioperative cardiac events are a leading cause of morbidity and mortality after non-cardiac surgery. The RCRI enables rapid, evidence-based cardiac risk stratification at the bedside using only history and a serum creatinine — no imaging required. It helps clinicians identify which patients can safely proceed to surgery and which need further cardiac evaluation, preventing both unnecessary testing delays and unrecognized high-risk situations.
RCRI Score = Sum of present risk factors (0–6) Risk factors: (1) High-risk surgery, (2) Ischemic heart disease, (3) CHF, (4) Cerebrovascular disease, (5) Insulin-dependent diabetes, (6) Creatinine > 2.0 mg/dL MACE rates: 0 points = 3.9%, 1 = 6.0%, 2 = 10.1%, ≥3 = 15%+
Result: RCRI Score = 2 (Class III), MACE risk 10.1%
A patient with ischemic heart disease undergoing high-risk abdominal surgery has 2 RCRI points (Class III, 10.1% MACE risk). Per ACC/AHA guidelines, noninvasive cardiac testing should be considered if functional capacity is below 4 METs (unable to climb one flight of stairs without symptoms).
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Intraperitoneal, intrathoracic, and suprainguinal vascular procedures. This includes major abdominal surgery, thoracic surgery, and aortic or peripheral vascular operations. Orthopedic, head/neck, and most urologic procedures are intermediate risk.
The RCRI has been validated in over 20 independent studies with consistent performance (c-statistic 0.65–0.75). It performs best for discriminating between low and high-risk patients. For precise individual risk prediction, it should be combined with clinical judgment and functional capacity assessment.
Functional capacity (measured in METs) is not part of the RCRI score itself but determines the next step when RCRI ≥ 2. If a patient can climb one flight of stairs or walk two blocks without symptoms (≥ 4 METs), further testing may be unnecessary regardless of RCRI score.
No. RCRI was developed and validated for non-cardiac surgery only. Cardiac surgery risk is assessed with dedicated scores (STS Score, EuroSCORE II) that account for cardiac-specific variables.
Age is not one of the six RCRI predictors but is indirectly captured (older patients are more likely to have the comorbidities that are scored). The ACC/AHA guidelines consider age ≥ 70 an additional risk factor that may lower the threshold for further evaluation.
In the original RCRI study, MACE included myocardial infarction, pulmonary edema, ventricular fibrillation or primary cardiac arrest, and complete heart block. Some later studies also include cardiac death and nonfatal stroke.