Abstract
Background A specific risk model concerning mortality of patients undergoing isolated coronary
artery bypass grafting (CABG) is developed based on the national quality benchmarking
mandatory by law in Germany.
Methods On the basis of the national data pool from 2004, a risk score model for patients
undergoing isolated CABG was developed and finally adjusted with the data of 43,145
patients of the year 2008. Modeling was performed by logistic regression analysis.
This risk model was validated with the 2007 data pool which comprised 45,569 patients.
Results Observed in-hospital mortality after isolated CABG procedures was 3.0% in 2008. Hosmer–Lemeshow
test p value was 0.189 and area under receiver operating characteristic curve was 0.826.
Applying the German CABG score for 2007 resulted in an observed-to-expected mortality
ratio of 1.01.
Conclusion The German CABG score for in-hospital mortality is a risk score with proven validity
for isolated CABG, developed by means of the patient population in Germany. It can
be used for the assessment of patient risk groups and for interhospital benchmarking.
We encourage other researchers to apply and validate this score in comparable health
care systems.
Keywords
in-hospital mortality - risk factors - CABG - risk adjustment
