Single versus multiple internal mammary artery grafting for coronary artery bypass: 15-year follow-up of a clinical practice trial

Circulation
William R BurfeindJ Scott Rankin

Abstract

The long-term clinical advantages of using routine multiple internal mammary artery (IMA) grafts for coronary artery bypass (CAB) are not clear. This study was designed to test the hypothesis that multiple IMA grafts would provide better 15-year outcomes when compared with single IMA and vein grafts. Between 1984 and 1987, 1067 consecutive patients undergoing isolated CAB were referred to 1 surgeon practicing primarily single and another surgeon maximizing multiple IMA grafts (clinical practice trial). A 207-patient subset with multiple IMAs underwent postoperative graft angiography at 1 to 32 weeks to define initial IMA patency. Patients were followed-up yearly, and the groups were analyzed as (I) surgical strategy (surgeon operating) (single=413 versus multiple=654), (II) ultimate operation performed (single=418 versus multiple=449), or (III) single versus multiple coronary systems revascularized with IMAs (single=490 versus multiple=377). Advantages of this study design were that an entire referral population was examined, multiple IMAs were applied to the entire spectrum of baseline patient risk, 15-year follow-up provided a complete prognostic picture, and the subgroups were potentially comparable at baseline. In all 3 ana...Continue Reading

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