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Ann Thorac Surg 1979;28:429-435
© 1979 The Society of Thoracic Surgeons


Articles

Late Coronary Bypass Graft Flow: Quantitative Assessment by Roentgendensitometry

Daniel Weisz, M.D.*, Robert I. Hamby, M.D., Agop Aintablian, M.D., Choudary Voleti, M.D., Rita Fogel, R.N., B. George Wisoff, M.D.

From the Departments of Surgery and Medicine, Cardio-Thoracic and Cardiology Divisions, Long Island Jewish-Hillside Medical Center, New Hyde Park, and the School of Medicine, Health Sciences Center, State University of New York at Stony Brook, Stony Brook, NY.

* Address reprint requests to Dr. Weisz, 270-05 76th Ave, New Hyde Park, NY 11042.

Quantitative assessment of the flow in 45 saphenous vein aortocoronary bypass grafts in 30 patients was performed by a roentgendensitometric technique. Details of the technique are given.

Mean graft flow for all grafts measured in the early postoperative period (two weeks) and again in the late postoperative period (six months to 3 years; average, 1.5 years) significantly decreased (72.6 ± 34.7 to 57.4 ± 28.6 ml/min; p < 0.01). Mean graft diameter also significantly decreased over the same period (3.5 ± 0.6 to 3.0 ± 0.6 mm; p < 0.01). Differences could not be related to graft site or to the time interval between early and late recatheterization. Changes in diameter did not correlate with changes in flow. During a 3-year follow-up, saphenous vein grafts significantly decreased in diameter and flow but still functioned adequately; and vein grafts generally remained larger than the recipient arteries. The determinant of adequacy of flow is the native coronary bed.







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Copyright © 1979 by The Society of Thoracic Surgeons.