Abstract：
BACKGROUND:The reversibility of the morphologic and functional alterations that occur in veins transplanted into the arterial circulation was examined in this study. METHODS:Common carotid vein bypass grafts (VG) were performed in 20 male New Zealand White rabbits. Ten VG and jugular veins (CV) were harvested after 14 days, and ten VG were reimplanted as venovenous bypass grafts (REV) and harvested after an additional 14 days. Vessels were taken for structural or isometric tension studies to norepinephrine, serotonin, and bradykinin and to acetylcholine and sodium nitroprusside after precontraction. RESULTS:There was a decrease in the thickness of the intima (p = 0.02) and the media (p = 0.002) in REV compared with VG. In REV, sensitivity to norepinephrine decreased (p = 0.0007) with a reduced maximal tension to norepinephrine (p = 0.02) and to serotonin (p = 0.0001). Bradykinin sensitivity increased in REV (p = 0.003 vs VG) and was greater than in CV. Only the precontracted CV and REV relaxed to acetylcholine. All tissues relaxed to sodium nitroprusside. CONCLUSIONS:This study suggests that intimal hyperplasia can be reversed with restoration of endothelium-dependent relaxing factor-mediated relaxation but that only a partial regression of the contractile abnormalities can be achieved.
journal_name
Surgeryjournal_title
Surgeryauthors
Davies MG,Klyachkin ML,Dalen H,Svendsen E,Hagen POsubject
Has Abstractpub_date
1993-08-01 00:00:00pages
258-70; discussion 270-1issue
2eissn
0039-6060issn
1532-7361journal_volume
114pub_type
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