title: Scanning electron microscope study of human veins and aorta-coronary artery vein grafts.
abstract: Scanning electron microscope study of two vein grafts which were removed after 50 months of implantation as aorta-coronary artery vein grafts showed considerable subendothelial thickening, which consisted of relatively cell-poor fibrous layer. In one of the grafts the endothelial surface was intact; the second graft showed focal loss of endothelial cells. Sections of two fresh human veins, studied prior to their insertion as aorta-coronary artery vein grafts, have shown that they retained an intact endothelial layer. A third fresh vein, however, showed focal damage with missing endothelial cells and adherent fibrin.
mesh_terms: D001344:Autopsy; D001026:Coronary Artery Bypass; D003331:Coronary Vessels / Q000473:pathology / Q000648:ultrastructure*; D006801:Humans; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D012501:Saphenous Vein / Q000473:pathology / Q000648:ultrastructure*