Prognostic information in administrative co-morbidity data following coronary artery bypass grafting.
OBJECTIVE
The aim of this study was to evaluate the prognostic information obtainable from administrative data with respect to 30-day mortality following coronary artery bypass grafting (CABG) and to compare it with the European System for Cardiac Operative Risk Evaluation (EuroSCORE) recorded in a clinical database.


METHODS
We used a co-morbidity index calculated from administrative data in the Danish National Patient Register by means of all admissions 1 year prior to CABG. In addition, each CABG was categorised as being isolated or not, and acute or not. The prognostic power of the co-morbidity index was compared to that achieved using EuroSCORE from a clinical database comprising information on all patients treated with CABG in Denmark. The outcome was all-cause mortality within 30 days after CABG and the prognostic power was evaluated using logistic regression analyses.


RESULTS
We identified 20078 patients treated with CABG from 2000 to 2007 with a complete registration of the total additive EuroSCORE in the clinical database. The co-morbidity index carried significant prognostic information regarding 30-day mortality (c-statistic 0.81). The prognostic power of the co-morbidity index was equal to that of the EuroSCORE (c-statistic 0.79).


CONCLUSIONS
A standard co-morbidity index based on administrative data as well as on clinical data has proven equally useful for prediction of mortality amongst CABG patients.
Abildstrøm
Steen Zabell
SZ
National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark. stabil@dadlnet.dk
Hvelplund
Anders
A
Rasmussen
Søren
S
Nielsen
Per Hostrup
PH
Mortensen
Poul Erik
PE
Kruse
Marie
M
D000368:Aged; D015897:Comorbidity; D001026:Coronary Artery Bypass / Q000401:mortality*; D016208:Databases, Factual; D003718:Denmark / Q000453:epidemiology; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D016896:Treatment Outcome