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Predictors of operative mortality for coronary bypass grafting in patients with ischemic heart disease
Insights
Predictors of operative mortality (OM) in coronary artery grafting (CAG) include severe angina, abrupt propranolol withdrawal, left main coronary disease, and prolonged cardiopulmonary bypass (CPB). Combining these factors improves risk prediction for patients undergoing CAG.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Clinical Cardiology
Background:
- Operative mortality (OM) is a critical outcome in coronary artery grafting (CAG).
- Identifying predictors of OM is essential for patient risk stratification and surgical planning.
- Previous studies have explored various factors influencing OM after CAG.
Purpose of the Study:
- To investigate predictors of operative mortality (OM) in patients undergoing coronary artery grafting (CAG).
- To examine the influence of pre-operative factors including angina class, propranolol withdrawal strategy, coronary artery disease extent, and cardiopulmonary bypass (CPB) duration on OM.
- To evaluate the combined effect of these predictors on OM for improved risk assessment.
Main Methods:
- Retrospective analysis of 172 consecutive patients undergoing CAG.
- Data collection on angina class, propranolol withdrawal (gradual vs. abrupt), left main coronary artery disease presence, and cardiopulmonary bypass (CPB) time.
- Statistical analysis to identify significant predictors of OM and their interdependencies.
Main Results:
- Overall operative mortality was 5.2% (9/172).
- Significant predictors of increased OM included Class IV angina (7%), abrupt propranolol withdrawal (6.6%), left main coronary artery disease (25%), and CPB longer than 120 minutes (50%).
- Combinations of left main coronary artery disease with prolonged CPB, and Class IV angina with prolonged CPB, were associated with significantly higher OM.
Conclusions:
- Class IV angina, abrupt propranolol withdrawal, left main coronary artery disease, and prolonged CPB are potent, interdependent predictors of OM in CAG.
- Considering these predictors individually and in combination enhances the effective prediction of OM for patients undergoing CAG.
- These findings aid in optimizing surgical strategies and patient selection for coronary artery grafting.
Abstract:
Predictors for operative mortality (OM) were studied in 172 consecutive patients (pts) undergoing coronary artery grafts (CAG) for angina pectoris.Seventy eight pts had Class IV angina; of the 147 patients given propranolol, 41 were gradually withdrawn from propranolol and finally discontinued 24 hours before surgery, and 106 were abruptly withdrawn from propranolol 24 hours before CAG; 20 pts had left main coronary disease; 156 pts had cardiopulmonary bypass (CPB) time shorter than 20 minutes, and 16 pts had a CPB longer than 120 minutes.The operative mortality was 5.2% (9/172) for the entire group. Class IV angina (OM 7%), abrupt propranolol withdrawal (OM 6.6%), left main coronary artery disease (OM 25%), and CPB longer than 120 minutes (OM 50%), all significantly increased OM. These variables were interdependent, however, as many pts belonged to several predictor categories, combinations of predictors were examined, in order to more accurately predict the risk of individual pts. The combination of left main coronary artery disease and CPB longer than 120 minutes; and Class IV angina and CPB longer than 120 minutes were significantly associated with higher operative mortality.We conclude that Class IV angina, abrupt propranolol withdrawal, left main coronary artery disease and prolonged CPB are potent, interdependent predictors of OM in pts undergoing CAG. Consideration of these predictors, alone and in combination, allows effective prediction of OM for CAG in patients with stable angina pectoris.