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J Thorac Cardiovasc Surg 2004;127:1408-1415
© 2004 The American Association for Thoracic Surgery

Surgery for acquired cardiovascular disease

Single versus bilateral internal thoracic artery grafts with concomitant saphenous vein grafts for multivessel coronary artery bypass grafting: Effects on mortality and event-free survival

L.M. Stevens, MDb, M. Carrier, MDa,b,*, L.P. Perrault, MD, PhDa,b, Y. Hébert, MDb, R. Cartier, MDa,b, D. Bouchard, MDb, A. Fortier, MSca, I. El-Hamamsy, MDb, M. Pellerin, MDa,b

a Research Center, Montreal Heart Institute, Montreal, Quebec, Canada
b Department of Surgery, Montreal Heart Institute, Montreal, Quebec, Canada

Received for publication August 4, 2003; revisions received September 30, 2003; accepted for publication October 6, 2003.

* Address for reprints: M. Carrier, MD, Department of Surgery, Montreal Heart Institute, 5000 Belanger St East, Montreal, Quebec H1T 1C8, Canada
michel.carrier{at}icm-mhi.org

BACKGROUND: The issue of superiority of single internal thoracic artery grafting versus bilateral internal thoracic artery grafting remains unresolved. The aim of this study was to compare the long-term outcome of single and bilateral internal thoracic artery grafting with concomitant saphenous vein grafting for multivessel coronary artery bypass grafting.

METHODS: Between March 1985 and April 1995, 6650 patients underwent primary isolated coronary artery bypass grafting with internal thoracic artery grafts, including 4382 patients with multivessel bypass grafting requiring at least 3 grafts. Outcomes of patients undergoing single internal thoracic artery plus saphenous vein grafting (n = 2547) and bilateral internal thoracic artery plus saphenous vein grafting (n = 1835) were obtained at a mean follow-up of 11 ± 3 years.

RESULTS: Patients with bilateral internal thoracic artery grafting were younger, were mostly male, and had less diabetes, hypertension, unstable angina, and recent myocardial infarction than patients undergoing single internal thoracic artery grafting. Thirty-day mortality was 2.3% for the group undergoing single internal thoracic artery grafting versus 1.2% for those undergoing bilateral internal thoracic artery grafting (P = .007). Survival probability at 10 years was 88% for the single-graft group compared with 93% for the bilateral-graft group (P < .001). Multivariate analysis with propensity scoring showed that bilateral internal thoracic artery grafting decreased the risk of death (hazard ratio, 0.74; 95% confidence interval, 0.60-0.90), myocardial infarction (hazard ratio, 0.79; 95% confidence interval, 0.67-0.93), and coronary reoperation (hazard ratio, 0.41; 95% confidence interval, 0.21-0.80) throughout the follow-up period. Other significant predictors of death were diabetes, prior myocardial infarction, need for intra-aortic balloon pump, chronic heart failure, and peripheral vascular disease.

CONCLUSION: Patients undergoing bilateral internal thoracic plus saphenous vein grafting appear to have a significantly better long-term clinical outcome than patients undergoing single internal thoracic artery plus saphenous vein grafting for multivessel coronary artery bypass grafting.




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