Validation of EuroSCORE II in Chinese Patients Undergoing Coronary Artery Bypass Surgery

Abstract

Background: Comparisons between the EuroSCORE and EuroSCORE II in the patient populations for coronary artery bypass grafting are limited. The aim of the study was to compare the use of the EuroSCORE and EuroSCORE II as risk model for predicting in-hospital mortality in Chinese patients undergoing coronary artery bypass grafting (CABG).Methods: Patients (n = 1598) with complete records of baseline and operative data were retrospectively collected from computerized records. The expected mortality rate for logistic EuroSCORE and EuroSCORE II was determined. Performance of the logistic EuroSCORE and EuroSCORE II model was assessed by comparing the observed and expected in-hospital mortality. The area under the receiver operating characteristics curve (AUC) values were calculated for these models to compare predictive power.Results: Observed in-hospital overall mortality rate was 3.19%. The logistic EuroSCORE model (Hosmer-Lemeshow: P < .05, O/E = 0.73) over-predicted mortality (4.39%) and the EuroSCORE II model showed good calibration and discriminative capacity (area 0.762) in predicting in-hospital mortality (Hosmer-Lemeshow: P = .191, O/E = 1.24).Conclusion: EuroSCORE II model reduces the overestimation of the calculated risk by logistic EuroSCORE in this population. EuroSCORE II risk model may be suitable in patients undergoing coronary artery bypass surgery in China.