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Ann Thorac Surg 1991;52:225-229
© 1991 The Society of Thoracic Surgeons

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Articles

Internal mammary artery graft at reoperation: Risks, benefits, and methods of preservation

Departments of Surgery and Hospital Epidemiology, Saint Thomas Hospital, and Departments of Surgery and Preventive Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA

^_* Address reprint requests to Dr Coltharp, 4230 Harding Rd, Suite 501, Nashville, TN 37205.

To determine the effect of a prior internal mammary artery (IMA) graft on coronary artery bypass reoperation (CABR), we reviewed our experience with 410 consecutive patients: 313 received only saphenous vein grafts at initial coronary artery bypass grafting (CABG), and 97 received at least one IMA graft at CABG. Cardiac catheterization data before CABG were available in 110 patients (56 received only saphenous vein grafts, 54 received at least one IMA graft), allowing comparison of left ventricular function at CABG and CABR. Injury of the IMA graft occurred in 5 patients (1 death), but presence of an IMA graft was not an independent predictor of morbidity or mortality. Overall, the incidences of complications and deaths were higher in patients with saphenous vein grafts than in patients with IMA grafts, though not significantly so. Internal mammary artery grafts better preserved cardiac function: patients with IMA grafts had worse left ventricular function before CABG but better left ventricular function before CABR than patients with saphenous vein grafts. Left ventricular function deterioration from before CABG to before CABR was significantly less in patients with IMA grafts. We conclude that the risk of CABR is not increased by a previously constructed IMA graft and that left ventricular function is better preserved at CABR when an IMA graft was constructed at the initial operation.

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