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Previous Volume 351:2302-2309 November 25, 2004 Number 22 Next

	Full Text PDF PDA Full Text PowerPoint Slide Set Perspective by Lytle, B. W. Letters Add to Personal Archive Add to Citation Manager Notify a Friend E-mail When Cited E-mail When Letters Appear PubMed Citation

ABSTRACT

Background In the past decade, the radial artery has frequently been used for coronary bypass surgery despite concern regarding the possibility of graft spasm. Graft patency is a key predictor of long-term survival. We therefore sought to determine the relative patency rate of radial-artery and saphenous-vein grafts in a randomized trial in which we controlled for bias in the selection of patients and vessels.

Methods We enrolled 561 patients at 13 centers. The left internal thoracic artery was used to bypass the anterior circulation. The radial-artery graft was randomly assigned to bypass the major vessel in either the inferior (right coronary) territory or the lateral (circumflex) territory, with the saphenous-vein graft used for the opposing territory (control). The primary end point was graft occlusion, determined by angiography 8 to 12 months postoperatively.

Results Angiography was performed at one year in 440 patients: 8.2 percent of radial-artery grafts and 13.6 percent of saphenous-vein grafts were completely occluded (P=0.009). Diffuse narrowing of the graft (the angiographic "string sign") was present in 7.0 percent of radial-artery grafts and only 0.9 percent of saphenous-vein grafts (P=0.001). The absence of severe native-vessel stenosis was associated with an increased risk of occlusion of the radial-artery graft and diffuse narrowing of the graft. Harvesting of the radial artery was well tolerated.

Conclusions Radial-artery grafts are associated with a lower rate of graft occlusion at one year than are saphenous-vein grafts. Because the patency of radial-artery grafts depends on the severity of native-vessel stenosis, such grafts should preferentially be used for target vessels with high-grade lesions.

Source Information

From the Divisions of Cardiac Surgery (N.D.D., S.E.F.), Cardiology (E.A.C.), and General Internal Medicine (C.D.N.), Sunnybrook and Women's College Health Sciences Centre, University of Toronto, Toronto.

Address reprint requests to Dr. Fremes at Sunnybrook and Women's College Health Sciences Centre, Rm. H410 2075 Bayview Ave., Toronto, ON M4N 3M5, Canada, or at stephen.fremes{at}sw.ca.

Full Text of this Article

Related Letters:

Radial-Artery Coronary Bypass Grafts
Khot U. N., Friedman D. T., Ellis S. G., Montoli A., Desai N. D., Fremes S. E.
Extract | Full Text | PDF  
N Engl J Med 2005; 352:941-942, Mar 3, 2005. Correspondence

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