Risk stratification analysis of operative mortality in coronary artery bypass surgery

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Abstract
Objective: We assessed the operative mortality of coronary artery bypass grafting (CABG) surgery using risk stratification.Methods: In 294 consecutive patients who underwent CABG with or without concomitant surgery from August 1994 to December 1999, we compared operative mortality calculated conventionally and by risk stratification. Scores for each patient were calculated using the Parsonnet additive model and stratified based on the probability of operative mortality.Results: Overall crude hospital mortality was 4.8%–4.0% among patients younger than 80 years and 14% among those 80 years of age or older (p=0.0692). Hospital mortality was 12% in urgent/emergency surgery, and 1.5% in elective surgery (pConclusion: Comparing predicted mortality and actual mortality enabled us to objectively calculate operative results and assess operative quality.