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Ann Thorac Surg 1979;28:176-183
© 1979 The Society of Thoracic Surgeons
From the Divisions of Thoracic and Cardiovascular Surgery and Cardiology, Wadsworth VA Hospital and UCLA School of Medicine, Los Angeles, CA
* Address reprint requests to Dr. Cukingnan, 465 N Roxbury Dr, Beverly Hills, CA 90210
To determine factors affecting saphenous vein graft patency, 218 grafts in 66 unselected patients were studied angiographically 1 year after operation. Fourteen variables were extracted from the angiograms, electrocardiograms, and intraoperative flow measurements to assess their predictive value. Preoperative coronary vessel diameter and degree of proximal stenosis measured angiographically correlated significantly with graft patency. Graft patency for vessels > 1.5 mm in diameter with > 70% stenosis was 93% (98 out of 105). Vessel size at operation and the presence of reactive hyperemia > 20 ml per minute also correlated significantly with graft patency. Reactive hyperemia increased significantly as the severity of the vessel stenosis proximal to the graft increased, thus suggesting a mechanism for the improved patency rate of grafts to more stenotic vessels. The patency rate of the end-to-side component of a continuity graft (left anterior descending coronary artery and diagonal or marginal artery in 1 graft) was 100% and of the side-to-side component, 77%.
This study shows that the patency rate for saphenous vein grafts compares favorably with the reported patency for internal mammary grafts when critical factors such as vessel size (> 1.5 mm) and degree of stenosis (> 70%) are considered in bypass selection.
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