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The risk of coronary bypass surgery for patients with postinfarction angina
T J Gardner1, R S Stuart, P S Greene
1Division of Cardiac Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland 21205.
Insights
Unstable postinfarction angina patients undergoing coronary artery bypass surgery had significant mortality predictors including anterior infarction and intra-aortic balloon pump use. Long-term survival rates were favorable.
Area of Science:
- Cardiology
- Cardiac Surgery
- Clinical Outcomes
Background:
- Unstable postinfarction angina is a critical condition requiring timely intervention.
- Coronary artery bypass grafting (CABG) is a primary treatment for severe coronary artery disease.
- Understanding predictors of mortality is crucial for patient management.
Purpose of the Study:
- To identify significant predictors of perioperative and late mortality in patients with unstable postinfarction angina undergoing isolated CABG.
- To evaluate long-term survival rates in this patient cohort.
Main Methods:
- Retrospective analysis of 300 consecutive patients undergoing isolated CABG for unstable postinfarction angina between 1982 and 1987.
- Univariate and multivariate analyses were performed to identify predictors of mortality.
- Kaplan-Meier survival analysis was used to assess long-term outcomes.
Main Results:
- Hospital mortality was 5%, with an additional 5.5% late deaths over a mean follow-up of 23.3 months.
- Significant independent predictors of mortality by multivariate analysis included anterior transmural infarction and preoperative intra-aortic balloon pump use.
- Actuarial survival was 96% at 1 year and 88% at 5 years.
Conclusions:
- Anterior transmural infarction and preoperative intra-aortic balloon pump use are key independent predictors of mortality in this patient group.
- Isolated CABG offers favorable long-term survival for patients with unstable postinfarction angina.
- Risk stratification based on these factors can aid in surgical decision-making and patient counseling.
Abstract:
Three hundred consecutive patients who developed unstable postinfarction angina requiring isolated coronary artery bypass from 1982 through 1987 were analyzed. Hospital mortality was 5%; 15 (5.5%) additional late deaths occurred during the 69-month follow-up period (mean follow-up, 23.3 months). Significant independent predictors of perioperative mortality by univariate analysis were ejection fraction (p = 0.004); existence of an anterior, transmural infarction (p = 0.0001); and the requirement for preoperative intra-aortic balloon counterpulsation (p = 0.001). By multivariate analysis, only the occurrence of an anterior, transmural infarction (p = 0.001) and the preoperative use of an intra-aortic balloon pump (p = 0.004) were significant independent predictors of mortality. Actuarial survival in this group ranged from 96 +/- 1% at 1 year to 88 +/- 4% at 5 years.