Simple Laboratory Test-Based Risk Scores in Coronary Catheterization: Development, Validation, and Comparison to...

Area of Science:

• Cardiology
• Medical Diagnostics
• Biostatistics

Background:

• Coronary catheterization is a common procedure with associated mortality risks.
• Accurate risk stratification is crucial for patient management and decision-making.
• Existing risk scores may not fully capture mortality risk in all patient populations.

Purpose of the Study:

• To develop and validate laboratory test-based risk scores (lab risk scores) for reclassifying mortality risk in patients undergoing their first coronary catheterization.
• To compare the predictive performance of lab risk scores against conventional demographic and clinical risk factors.

Main Methods:

• Utilized logistic regression with group LASSO penalty to select significant laboratory tests (<30 days pre-catheterization) and demographic factors associated with mortality.
• Developed risk scores from selected variables and validated them internally (Calgary) and externally (Edmonton).
• Assessed discrimination, calibration, and net reclassification improvement compared to traditional risk factors.

Main Results:

• Lab risk scores demonstrated strong associations with mortality (29-40x higher risk for top vs. bottom quintile).
• Scores showed good discrimination and calibration in both derivation and validation cohorts (C-indices 0.80-0.85).
• Lab risk scores reclassified 11%-20% of deaths and 6%-9% of survivors, outperforming traditional risk factors.

Conclusions:

• Laboratory test-based risk scores are as powerful as demographic and clinical factors in predicting mortality after coronary catheterization.
• These lab risk scores offer a valuable tool for risk stratification in patients undergoing the procedure.
• Implementation of lab risk scores can improve patient management and outcomes.