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a Duke University Medical Center, Durham, North Carolina
b The Congenital Heart Institute of Florida (CHIF) and Cardiac Surgical Associates (CSA), All Children’s Hospital and Children’s Hospital of Tampa, University of South Florida, Saint Petersburg and Tampa, Florida
c Children’s Hospital, Denver, Colorado
d Memorial Hospital Child’s Health Centre, Warsaw, Poland
e St. Christopher’s Hospital for Children, Philadelphia, Pennsylvania
f Wayne State University School of Medicine, Detroit, Michigan
g Montreal Children’s Hospital, Montreal, Quebec, Canada
h Division of Cardiothoracic Surgery, Oregon Health and Science University, Portland, Oregon
i Children’s Memorial Health Institute, Warsaw, Poland
j Policlinico Universita, Padova, Italy
k Children’s Memorial Hospital, Chicago, Illinois
l Freeman Hospital, Newcastle Upon Tyne, United Kingdom
m The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
n Royal Liverpool Children’s Hospital Alder Hey, Liverpool, United Kingdom
o Children’s Hospital Heart Institute, Denver, Colorado
Accepted for publication June 8, 2007.
* Address correspondence to Dr O’Brien, Box 17969, Duke Clinical Research Institute, Durham, NC 27715 (Email: obrie027{at}mc.duke.edu).
Presented at the Forty-third Annual Meeting of The Society of Thoracic Surgeons, San Diego, CA, Jun 29–31, 2007.
Background: The Aristotle Basic Complexity Score (ABC score) was derived by consensus of an international surgeon panel to facilitate assessment of surgical performance for quality improvement in congenital heart surgery. The utility of the ABC score depends on its ability to correctly classify procedures according to their potential for morbidity, mortality, and technical difficulty. This collaborative study combined two multiinstitution databases to assess how well the ABC score predicts the actual morbidity and mortality potential of 131 congenital heart surgery procedures.
Methods: Data from the European Association of Cardiothoracic Surgery (EACTS) congenital database (17,838 operations, 56 centers) and the Society of Thoracic Surgeons (STS) congenital database (18,024 operations, 32 centers) were analyzed. Discrimination of the ABC score for predicting in-hospital mortality and postoperative length of stay (PLOS) of more than 21 days was quantified by the C statistic. Procedure-specific rates of mortality and prolonged PLOS were compared with predictions from a logistic regression model, and an exact binomial test was used to identify procedures that were mortality and morbidity outliers.
Results: There was a significant positive correlation between the ABC score of a procedure and its observed procedure-specific risk of mortality (C = 0.70) and prolonged PLOS (C = 0.67). Several individual procedures were identifed as mortality and morbidity outliers.
Conclusions: The ABC score generally discriminates between low-risk and high-risk congenital procedures making it a potentially useful covariate for case-mix adjustment in congenital heart surgery outcomes analysis. Planned revisions of the ABC score will incorporate empirical data and will benefit from the large sample sizes of the STS and EACTS databases.
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