Radial artery graft string sign due to lumen obliteration by neointima: insight from optical coherence tomography.

The radial artery is a commonly used conduit for coronary artery bypass grafting. Long-term patency rates are at least as good and in some series are better than for saphenous vein grafts (1,2). owever, radial artery graft failure remains a ignificant problem (3), in particular in cases here radial conduits are used on smaller target essels or where there is significant competitive ow from a native coronary with a relatively low rade stenosis (4). The string sign, where the radial graft conduit is patent but with only a thread of antegrade flow, is a well-recognized angiographic presentation of radial graft failure