How this calculator works
The original RCRI assigns one point to each of six factors for patients undergoing major noncardiac surgery. Class I is 0, II is 1, III is 2 and IV is at least 3. The separate 2017 Canadian Cardiovascular Society estimates for 30-day death, MI or cardiac arrest are 3.9%, 6.0%, 10.1% and 15.0% respectively. These differ from the original study's broader cardiac-complication endpoint and should not be mixed. The result is an estimate for information only and is not medical advice.
Formula
RCRI = sum of six 0/1 factors. CCS 2017 30-day event estimates: 0 → 3.9%; 1 → 6.0%; 2 → 10.1%; ≥3 → 15.0%.
Worked example
No factors gives score 0, class I and cohort estimate 3.9%. Insulin treatment plus prior heart failure gives score 2, class III and 10.1%.
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Frequently asked questions
Is this for cardiac surgery?
No. It is intended for major noncardiac surgery.
Does exactly 2 mg/dL score a creatinine point?
The original RCRI definition used above 2 mg/dL; this page preserves that strict boundary.
Why do other pages show 0.4% or 0.9%?
They may report the original complication rates, which use a different endpoint and cohort.