Preoperative Cardiac Risk Evaluation with RCRI and AUBHAS2
Comparison of Risk Assessment Tools
- The Revised Cardiac Risk Index (RCRI) is superior to AUBHAS2 for preoperative cardiac risk evaluation due to its extensive validation, widespread clinical adoption, and recommendation in the 2024 AHA/ACC guidelines for perioperative cardiovascular management 1, 2
- RCRI is a simple, validated, and commonly used tool to assess perioperative risk of major cardiac complications, with 6 predictors of risk (1 point assigned for each criterion) 1
- The American University of Beirut (AUB) HAS2 cardiovascular risk index is a newer tool that stratifies patients into low (score 0-1), intermediate (score 2-3), and high risk (score >3) based on 6 data elements 1, 2
- RCRI risk factors include: ischemic heart disease, congestive heart failure, cerebrovascular disease, high-risk surgery, preoperative insulin treatment for diabetes mellitus, and preoperative kidney dysfunction 3
- Risk stratification with RCRI shows increasing risk with more factors: 0 factors (low risk), 1 factor (low to moderate risk), 2 factors (moderate risk), and ≥3 factors (high risk) for major cardiac complications 4
Strengths and Limitations of RCRI
- The RCRI is endorsed by the American College of Cardiology and American Heart Association in their 2024 guidelines for perioperative cardiovascular management 1, 5
- The RCRI provides moderate discriminative ability for cardiac events in patients undergoing non-cardiac surgery 5, 6
- The RCRI has been recalibrated for specific surgical populations (e.g., thoracic surgery as ThRCRI) to improve its predictive accuracy in specialized settings 7, 8
- In a pooled analysis of 24 validation studies, the RCRI showed modest risk discrimination for cardiac events, with some discordance among risk-prediction tools in identifying low-risk patients 1
Clinical Application and Decision-Making
- For initial cardiac risk assessment, use the RCRI as a validated screening tool before proceeding to more specialized cardiac testing 5, 6
- For patients with RCRI ≥2, consider additional risk assessment, including functional capacity evaluation using tools like the Duke Activity Status Index (DASI) 1, 2
- For thoracic surgery patients, the ThRCRI is recommended as it has been specifically recalibrated for this population 7, 8