EuroSCORE II.

Area of Science:

• Cardiology
• Medical Statistics
• Health Services Research

Background:

• The European System for Cardiac Operative Risk Evaluation (EuroSCORE) is a widely used tool for assessing cardiac surgery risk.
• Over time, patient demographics and surgical outcomes have evolved, necessitating an update to the original EuroSCORE model.
• Previous iterations of the EuroSCORE may not accurately reflect current patient populations and their associated risks.

Purpose of the Study:

• To develop and validate an updated risk prediction model for major cardiac surgery.
• To improve the accuracy of cardiac surgical risk assessment by incorporating contemporary data.
• To create a new model, EuroSCORE II, that better reflects current patient profiles and outcomes.

Main Methods:

• Prospective data collection from 22,381 major cardiac surgery patients across 154 hospitals in 43 countries.
• Rigorous data validation using mandatory fields, range checks, and logic checks.
• Development of a logistic regression model (EuroSCORE II) using a dedicated dataset and testing on a separate validation subset.

Main Results:

• The patient cohort was older and had more comorbidities (e.g., NYHA class IV, renal dysfunction) than the original EuroSCORE database.
• The original EuroSCORE models overpredicted mortality in the current patient population.
• EuroSCORE II demonstrated good calibration (predicted vs. actual mortality) and strong discrimination (AUC of 0.8095) in the validation subset.

Conclusions:

• Despite significant reductions in cardiac surgical mortality, patients undergoing surgery are older and sicker.
• EuroSCORE II offers improved calibration and maintains powerful discrimination for assessing cardiac surgical risk.
• EuroSCORE II is proposed as the future standard for cardiac surgical risk assessment.