title: Laminar flow due to venous valves masquerading as vein graft spasm.
abstract: Two cases of laminar flow at the venous valves were found to produce a tapered appearance of the vein grafts, similar to spasm, during angiography. This possibility should be kept in mind when considering the diagnosis of spasm in a vein graft during postoperative angiographic studies. In addition, the follow-up of these cases suggests that valves may predispose to later stenosis or occlusion of the vein grafts.
mesh_terms: D000328:Adult; D000368:Aged; D000792:Angiography; D001026:Coronary Artery Bypass / Q000009:adverse effects*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D012501:Saphenous Vein / Q000000981:diagnostic imaging / Q000473:pathology* / Q000637:transplantation; D014661:Vasoconstriction