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J Thorac Cardiovasc Surg 1999;117:292-297
© 1999 Mosby, Inc.

SURGERY FOR ADULT CARDIOVASCULAR DISEASE

QUANTITATIVE ANGIOGRAPHIC ASSESSMENT OF CORONARY ANASTOMOSES PERFORMED WITHOUT CARDIOPULMONARY BYPASS

From the Departments of Surgery^a and Radiology^b and the Cardiac Catheterization Laboratory,^c Montreal Heart Institute, Montreal.

Received for publication March 12, 1998. Revisions requested June 12, 1998; revisions received Aug 26, 1998. Accepted for publication Sept 18, 1998. Address for reprints: Michel Carrier, MD, Montreal Heart Institute, 5000 Belanger St E, Montreal, Quebec H1T 1C8, Canada.

Background: The quality of the anastomosis performed during coronary artery bypass grafting without cardiopulmonary bypass is a current concern, and myocardial wall restraining devices have been designed to optimize results. A quantitative angiographic analysis was performed to assess coronary anastomoses performed on beating hearts.
Methods: We studied 34 patients who underwent coronary artery bypass grafting without cardiopulmonary bypass between February 1996 and April 1997. The left internal thoracic artery was anastomosed to the left anterior descending coronary artery in all patients. Coronary angiograms were performed 4 ± 2 days after the operation. The diameter of the anastomoses was quantified by computer-assisted analysis of grafts and native coronary arteries at the toe and heel of the anastomosis.
Results: Five of the patients who underwent coronary artery bypass without a stabilizer (n = 20) had stenoses of the internal thoracic artery grafted to the left anterior descending coronary artery of more than 50% at the level of the anastomosis proper, 3 had stenoses at the heel of the coronary anastomosis, and 5 had stenoses at the toe. One of the patients in whom a stabilizer was used (n = 14) had a stenosis of more than 50% at the anastomosis, and 1 had stenosis at the heel. Eight patients in whom the anastomoses were performed without stabilization (8/20, 40%) had stenoses of more than 50%, whereas there was only 1 stenosis of more than 50% of coronary luminal diameter among the patients in whom the operation was performed with a stabilizer (P = .02).
Conclusion: The quantitative angiographic evaluation suggests that left internal thoracic artery graft to left anterior descending coronary artery anastomoses have a lesser degree of intraluminal stenosis when performed with the use of a myocardial wall stabilizer.

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