ObjectiveReport the experience with the Society of Thoracic Surgeons scoring system in a
Brazilian population submitted to isolated coronary artery bypass graft
surgery.MethodsData were collected from January-2010 to December-2011, and analyzed to determine
the performance of the Society of Thoracic Surgeons scoring system on the
determination of postoperative mortality and morbidity, using the method of the
receiver operating characteristic curve as well as the Hosmer-Lemeshow and the
Chi-square goodness of fit tests. From the 1083 cardiac surgeries performed during
the study period 659 represented coronary artery bypass graft procedures which are
included in the present analysis. Mean age was 61.4 years and 77% were men.ResultsGoodness of fit tests have shown good calibration indexes both for mortality
(X2=6.78, P=0.56) and general morbidity
(X2=6.69, P=0.57). Analysis of area under the
ROC-curve (AUC) demonstrated a good performance to detect the risk of death (AUC
0.76; P<0.001), renal failure (AUC 0.79;
P<0.001), prolonged ventilation (AUC 0.80;
P<0.001), reoperation (AUC 0.76; P<0.001)
and major morbidity (AUC 0.75; P<0.001) which represents the
combination of the assessed postoperative complications. STS scoring system did
not present comparable results for short term hospital stay, prolonged length of
hospital stay and could not be properly tested for stroke and wound infection.ConclusionSociety of Thoracic Surgeons scoring system presented a good calibration and
discrimination in our population to predict postoperative mortality and the
majority of the harmful events following coronary artery bypass graft surgery.
Analysis of larger samples might be needed to further validate the use of the
score system in Brazilian populations.
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