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Ann Thorac Surg 1977;23:1-8
© 1977 The Society of Thoracic Surgeons

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Articles

Sequential Anastomoses in Coronary Artery Grafting: Technical Aspects and Early and Late Angiographic Results

Department of Surgery, Montreal Heart Institute, Montreal, Que, Canada

Accepted for publication April 16, 1976.

^* Address reprint requests to Dr. C. M. Grondin, Department of Surgery, Montreal Heart Institute, 5000 E Belanger St, Montreal, Que H1T 1C8, Canada.

The present study concerns itself with the early and late results obtained with aortocoronary vein grafts containing more than 1 coronary anastomosis per graft. The surgical technique is described in detail and some of the hazards are outlined. It is apparent that the use of side-to-side anastomoses (SSAs) leads to a marked increase in blood flow in the proximal portion of the graft (average flow, 131 ml/min) and also increases the patency rate of the proximal anastomosis. Thus, 3 of 51 SSAs were obstructed on the early angiogram, and only 1 of the 28 SSAs restudied at one year had become occluded. Although the cumulative—early and late—patency rate (55/66, or 83.3%) of the distal end-to-side anastomoses (ESAs) was not significantly better than that usually seen with conventional vein grafts, it is believed that improvement in the technique and greater awareness of some of its pitfalls will further decrease the occlusion rate of distal ESAs. Most occlusions of the ESA appeared related to angulation, which tended to occur in the segment of graft between the proximal and the distal anastomoses. Appropriate modifications in the technique are described that should help to eliminate this difficulty.

The use of SSAs also allows for grafting of small coronary arteries which, with the conventional single anastomosis technique, are not usually bypassed in view of the high expected failure rate. Thus, of the 9 SSAs performed to 1 mm arteries and studied on two occasions, 8 remained open early after operation and 7 were still patent a year later.

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