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Aortocoronary bypass results: a discriminant multivariate analysis of risk factors of operative mortality
G Ottino1, S Bergerone, M Di Leo
1Department of Cardiovascular Medicine and Heart Surgery, University of Turin, Turin, Italy.
Insights
Older age and longer cross-clamp times significantly increase operative mortality risk in coronary artery bypass surgery patients. These factors are critical for improving surgical outcomes and patient survival rates.
Area of Science:
- Cardiovascular Surgery
- Medical Statistics
Background:
- Coronary artery bypass surgery (CABG) is a critical intervention for managing coronary artery disease.
- Evaluating operative mortality and associated risk factors is essential for refining surgical protocols and improving patient outcomes.
Purpose of the Study:
- To analyze the clinical outcomes of CABG, focusing on operative mortality.
- To identify significant risk factors contributing to operative mortality in CABG patients.
Main Methods:
- Retrospective analysis of 437 consecutive CABG patients from January 1979 to December 1983.
- Exclusion of patients who underwent combined surgical procedures.
- Statistical analysis of clinical, angiographic, and surgical variables to determine risk factors for operative mortality.
Main Results:
- Overall operative mortality was 5.49% (24 patients), with cardiac causes accounting for 75% of deaths.
- Significant risk factors for operative mortality identified were advanced age (p = 0.002) and prolonged cross-clamp time (p = 0.016).
- Ejection fraction (EF) approached statistical significance as a risk factor (p = 0.06).
Conclusions:
- Age and cross-clamp time are significant predictors of operative mortality in CABG.
- These findings highlight the importance of patient age and procedural efficiency in CABG outcomes.
- Further investigation into factors like ejection fraction may further refine risk assessment.
Abstract:
Clinical results of coronary artery bypass surgery have been evaluated analyzing operative mortality and its related risk factors. Four hundred and thirty seven consecutive patients undergoing coronary artery bypass surgery between January 1979, and December 1983, form the clinical material of this study. The gender of patients was male in 89% of the cases, the age ranged from 34 to 78 years with a mean of 54.8 +/- 8.2 (SD); patients with combined surgical procedures were excluded. The operative mortality was 5.49% (24 patients); no significant difference was found between years of the observation period. Death was due to cardiac causes in 75% of cases. Statistical analysis carried on 14 clinical, angiographic and surgical variables identified as significant risk factors of operative mortality age (p = 0.002) and cross-clamp time (p = 0.016). Both of these increased their weight when entered in a stepwise logistic regression. The EF also showed a value close to statistical significance (p = 0.06).