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Coronary bypass with arterial conduits
D F Del Rizzo1, S E Fremes, G T Christakis
1Sunnybrook Health Science Centre, University of Toronto, Canada.
Insights
Multi-arterial grafting is a safe and effective myocardial revascularization technique in carefully selected patients. Further studies are needed to determine if this approach improves long-term survival and reduces reoperation rates.
Area of Science:
- Cardiovascular Surgery
- Surgical Outcomes Research
Background:
- Coronary artery bypass grafting (CABG) is a common procedure for myocardial revascularization.
- The choice of arterial and venous conduits can influence surgical outcomes.
- Multi-arterial grafting aims to improve revascularization efficacy compared to conventional methods.
Purpose of the Study:
- To assess the efficacy and safety of multi-arterial grafting compared to single internal mammary artery or saphenous vein grafts.
- To identify predictors of operative mortality in patients undergoing myocardial revascularization.
Main Methods:
- Retrospective analysis of 368 patients undergoing multi-arterial grafting (group M).
- Comparison with 2092 patients receiving single internal mammary artery +/- veins (group S) and 602 patients receiving only saphenous vein grafts (group V).
- Multivariate logistic regression analysis to identify predictors of operative mortality.
Main Results:
- Group M patients were younger and had fewer comorbidities (less female, urgent cases, preoperative myocardial infarction, redo surgery) than groups S and V.
- Redo surgery, intra-aortic balloon pump assist, diabetes, urgent surgery, and advanced age predicted operative mortality.
- Conduit choice did not predict mortality or morbidity in regression analysis, despite univariate differences.
Conclusions:
- Multi-arterial grafting is a safe and efficacious procedure in carefully selected patients, despite technical challenges.
- Long-term survival and freedom from reoperation require further investigation.
- Patient selection is crucial for optimizing outcomes in complex revascularization strategies.
Abstract:
To assess the efficacy of arterial revascularization 368 patients were studied who underwent myocardial revascularization with two or more arterial conduits (group M) and compared with 2092 patients in whom a single internal mammary artery +/- veins (group S), and to a third group in which only saphenous vein conduits (group V, n = 602) were used. Group M patients were younger (aged 54.0(9.5) years; 4.1% aged > 70 years) than either group V (67.6(8.9) years, 40.7% > 70 years, P < 0.0001) or group S patients (62.0(8.5) years, 15.7% > 70 years, P < 0.0001). Furthermore, this cohort group had the lowest percentage of females (8.4%), of urgent cases (21.7%), of preoperative myocardial infarction (6.0%), and of redo surgery (0.8%). In contrast, patients who received only saphenous vein conduits had the highest proportion of female patients (29.2%), of urgent cases (47.4%), of preoperative myocardial infarction (16.5%), and of redo surgery (5.5%). By multivariate logistic regression analysis (odds ratio in parentheses), redo surgery (6.06, P = 0.0001), preoperative intra-aortic balloon pump assist (6.11, P = 0.0001), diabetes (1.97, P = 0.03), urgent surgery (1.80, P = 0.05), and advanced age (2.14, P = 0.01) were all predictors of operative mortality. In contrast, while choice of conduit appeared to influence outcome by univariate analysis (4.2% mortality in group V, P < 0.001), it was not found to be a predictor of either mortality or morbidity by regression analysis. The present results indicate that, in carefully selected patients, despite increased technical demands with longer periods of aortic occlusion and longer pump times, multi-arterial grafting (compared with conventional revascularization) is a safe and efficacious procedure. Whether or not this approach to revascularization will increase long-term survival and freedom from reoperation will require further study.