RCRI Calculator (Revised Cardiac Risk Index)
The Revised Cardiac Risk Index, also known as the Lee Index, is the most widely used tool for estimating the risk of a major cardiac event after non-cardiac surgery. It uses six simple clinical predictors to classify patients into risk categories, helping guide decisions about preoperative testing and perioperative management.
The RCRI was developed by Thomas Lee and colleagues, published in Circulation in 1999, using data from 4,315 patients aged 50 or older undergoing elective major non-cardiac surgery. Each of the six predictors adds 1 point:
- High-risk surgery: Intraperitoneal, intrathoracic, or suprainguinal vascular procedures
- Ischemic heart disease: History of MI, positive stress test, current angina, nitrate use, or pathological Q waves on ECG
- Congestive heart failure: History of CHF, pulmonary edema, S3 gallop, bilateral rales, or CXR showing pulmonary vascular redistribution
- Cerebrovascular disease: History of stroke or transient ischemic attack
- Insulin-dependent diabetes: Diabetes requiring preoperative insulin
- Renal insufficiency: Preoperative creatinine above 2.0 mg/dL
Risk stratification:
- 0 points: ~3.9% risk (very low)
- 1 point: ~6.0% risk (low)
- 2 points: ~10.1% risk (moderate)
- 3+ points: ~15% or higher risk (elevated)
The original Lee study reported lower risk percentages (0.4%, 0.9%, 6.6%, 11% for classes I-IV), but subsequent validation studies and meta-analyses have shown higher event rates, particularly when including troponin-detected myocardial injury.
The RCRI has its limitations. It was validated in an era before modern troponin assays, and it does not account for patient age, functional capacity, or the specific type of surgery beyond the high-risk category. Despite these limitations, it remains the recommended starting point for preoperative cardiac risk stratification in guidelines from the AHA/ACC, ESC, and CCS.
Disclaimer: This calculator is for educational purposes only. Perioperative cardiac risk assessment should incorporate clinical judgment, patient preferences, and the specific surgical context. Consult your surgical and anesthesia team.