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Ann Thorac Surg 2005;79:544-551
© 2005 The Society of Thoracic Surgeons

Original article: Cardiovascular

Comparison of Saphenous Vein and Internal Thoracic Artery Graft Patency by Coronary System

Joseph F. Sabik, III, MDa,*, Bruce W. Lytle, MDa, Eugene H. Blackstone, MDa,b, Penny L. Houghtaling, MSb, Delos M. Cosgrove, MDa

a Department of Thoracic and Cardiovascular Surgery
b Department of Biostatistics and Epidemiology, The Cleveland Clinic Foundation, Cleveland, Ohio

Accepted for publication July 19, 2004.

* Address reprint requests to Dr Sabik, Department of Thoracic and Cardiovascular Surgery, The Cleveland Clinic Foundation, 9500 Euclid Ave, Desk F24, Cleveland, OH 44195 (E-mail: sabikj{at}ccf.org).

Presented at the Fortieth Annual Meeting of The Society of Thoracic Surgeons, San Antonio, TX, Jan 26–28, 2004.

BACKGROUND: We sought to compare saphenous vein and internal thoracic artery graft patency by coronary system.

METHODS: From 1972 to 1999, 50,278 patients underwent primary coronary surgery; subsequently, 4,333 had angiography of 2,121 internal thoracic artery and 8,733 saphenous vein grafts. Longitudinal analysis was used to model graft occlusion and identify risk factors. Using the model, patency was calculated twice for each graft and compared first as if an internal thoracic artery, and second as if a saphenous vein, were used.

RESULTS: Unadjusted 1-, 5-, and 10-year patency was 93%, 88%, and 90% for internal thoracic arteries and 78%, 65%, and 57% for saphenous veins. At 10 years, internal thoracic arteries were more likely than saphenous veins to be patent to left anterior descending in 99.1% of cases, to diagonals in 98.3%, to circumflex in 98.3%, to posterior descending artery in 98.5%, and to right coronary arteries in 82.5%. For right coronary arteries, saphenous vein patency was equivalent to or better than internal thoracic artery patency early after surgery. However, by 10 years, internal thoracic artery patency was better in right coronary arteries with 70% stenosis or greater. At all times after surgery and all levels of clinically important coronary stenosis, internal thoracic artery patency surpassed saphenous vein patency in grafts to the left anterior descending, diagonal, circumflex, and posterior descending arteries.

CONCLUSIONS: Internal thoracic arteries demonstrate better patency than saphenous veins except when grafting moderately stenosed right coronary arteries. When bypassing right coronary arteries with less than 70% stenosis, saphenous veins may be a better choice.




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