title: A functional and histopathological comparison of proximal and distal saphenous vein contractility and morphology.
abstract: Variations in vascular reactivity and morphology of proximal and distal saphenous vein might affect its performance as a bypass conduit. Because peri- or postoperative graft spasm or intimal hyperplasia reduces patency, we compared the reactivity and morphology of human proximal and distal saphenous vein conduits. Isometric tension studies were performed in response to potassium chloride (80 mM), phenylephrine (10(-8) - 10(-5) M), norepinephrine (10(-8) - 10(-5) M), and angiotensin II (10(-11) - 10(-7) M). Relaxant responses were tested with acetylcholine (10(-9) - 10(-5) M), sodium nitroprusside (10(-10) - 10(-6) M), and diltiazem (10(-10) - 10(-4) M). Also, vein segments from proximal and distal leg saphenous vein grafts were collected for histopathologic investigation. In proximal and distal saphenous vein segments, we also examined the structure of intima, media, and adventitia, and we evaluated the smooth muscle cell/extracellular matrix ratio in the media. There was no significant difference (P > 0.05) between proximal and distal venous segments in response to vasoconstrictors or vasodilators. Similarly, investigation by light microscopy was unable to show any significant difference between proximal and distal conduits in vascular structure. The smooth muscle cell/extracellular matrix ratio was also similar in these graft materials. Our failure to find functional or morphologic differences between proximal and distal saphenous vein segments suggests that there is no advantage in using one of these preparations over the other as a conduit in coronary artery bypass operations.
authors.affiliation: Department of Cardiovascular Surgery, Akdeniz University, 07070 Antalya, Turkey. Golbasi@akdeniz.edu.tr
authors.forename: Ilhan
authors.initials: I
authors.lastname: Golbasi
authors.forename: Arda
authors.initials: A
authors.lastname: Tasatargil
authors.forename: Nazif Hikmet
authors.initials: NH
authors.lastname: Aksoy
authors.forename: Gulay
authors.initials: G
authors.lastname: Sadan
authors.forename: Edibe
authors.initials: E
authors.lastname: Karasu
authors.forename: Cengiz
authors.initials: C
authors.lastname: Turkay
authors.forename: Omer
authors.initials: O
authors.lastname: Bayezid
mesh_terms: D000368:Aged; D001026:Coronary Artery Bypass; D003327:Coronary Disease / Q000601:surgery; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D008875:Middle Aged; D011189:Potassium Chloride / Q000494:pharmacology; D012501:Saphenous Vein / Q000166:cytology* / Q000502:physiology* / Q000637:transplantation; D018608:Ultrasonography, Doppler; D014661:Vasoconstriction / Q000187:drug effects / Q000502:physiology*; D014662:Vasoconstrictor Agents / Q000494:pharmacology
chemical_list: D014662:Vasoconstrictor Agents; D011189:Potassium Chloride