RCRI (Revised Cardiac Risk Index) Calculator

The Revised Cardiac Risk Index (RCRI), also called the Lee Index, estimates the risk of major cardiac complications in the 30 days after major noncardiac surgery. Thomas Lee and colleagues published it in 1999 after studying more than 4,000 surgical patients. It uses six simple yes or no risk factors, so you can score it at the bedside without a complex model. A higher count of factors moves the patient into a higher risk class.

Each of the six Lee risk factors that applies adds 1 point, and the total is the sum (an integer from 0 to 6). The six factors are high-risk surgery, a history of ischemic heart disease, a history of congestive heart failure, a history of stroke or transient ischemic attack, preoperative insulin treatment, and a preoperative serum creatinine above 2 mg/dL. This calculator scores the creatinine factor for you: enter the lab value in mg/dL and it adds the point when the result is above 2.0 (about 176.8 micromol/L).

The point total maps to four risk classes. In the original Lee 1999 validation cohort, Class I (0 points) carried about a 0.4% rate of major cardiac complications, Class II (1 point) about 0.9%, Class III (2 points) about 6.6%, and Class IV (3 or more points) about 11%. Major complications here mean myocardial infarction, pulmonary edema, ventricular fibrillation or primary cardiac arrest, and complete heart block. More recent validations report somewhat higher event rates, so treat these figures as the classic estimates rather than exact modern probabilities.

In the RCRI, high-risk surgery means an intraperitoneal procedure, an intrathoracic procedure, or a suprainguinal vascular procedure (such as aortic or other major vascular surgery above the groin). These operations carried the largest cardiac stress in the original study, so they score 1 point. Lower-risk operations, such as endoscopic, superficial, cataract, or ambulatory procedures, do not score this factor. If you are unsure how a planned operation is classified, ask the surgical or anesthesia team.

The renal risk factor is defined as a preoperative serum creatinine above 2.0 mg/dL, which is about 176.8 micromol/L. Entering the actual lab value lets the tool apply that threshold for you, so you do not have to remember the exact cutoff. A creatinine of exactly 2.0 does not score the point, while any value above it adds 1 point. If your lab reports creatinine in micromol/L, divide by 88.4 to convert to mg/dL before entering it.

No. This calculator is for education and quick reference only and is not a substitute for professional medical advice, diagnosis, or treatment. The RCRI describes risk across groups of patients and does not predict the outcome for any single person. Perioperative decisions belong with a qualified clinician who can weigh the specific operation, your functional capacity, cardiac biomarkers, and your full medical history.