Abstract
We thank Dr Nezic and colleagues for their interest in our work. They suggest that our conclusions on the relative patency of radial artery (RA) and saphenous vein (SV) grafts in diabetic patients1 may differ if string sign grafts were considered occluded rather than patent. The predefined primary end point of the Radial Artery Patency Study2,3 was the proportion of RA and SV grafts that were completely occluded at follow-up angiography, where complete occlusion was defined as the absence of visible opacification of the target coronary vessel (ie, Thrombolysis in Myocardial Infarction [TIMI] 0 flow).4 Perfect graft patency (TIMI 3 flow) was a secondary angiographic end point, as was the presence of diffuse narrowing of the graft to <1 mm in diameter but with TIMI flow of at least 1 (ie, angiographic “string sign”). The study …
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