RA graft patency in relation to preoperative target vessel stenosis of 90%
The stenosis of the target coronary artery vessel to which RA was grafted was < 90% in all five patients that developed RA graft stenosis at 12 months. Namely, the native vessel stenoses on preoperative coronary angiography was 70-80% in all 5 cases. Conversely, no significant RA graft stenosis was seen on in the remaining 45 patients in whom the RA was placed to a native target vessel with > 90% narrowing (p<0.0001).