title: Patency of aortocoronary saphenous vein bypass grafts 5 to 7 years after surgery.
mesh_terms: D017023:Coronary Angiography; D001026:Coronary Artery Bypass / Q000592:standards*; D005500:Follow-Up Studies; D006085:Graft Survival; D006801:Humans; D012501:Saphenous Vein / Q000000981:diagnostic imaging* / Q000637:transplantation; D014182:Transplantation, Autologous