涤纶人工血管重建狗下腔静脉时血浆与腔面6-K-PGF_(1α)变化的研究

A study on changes of 6 K PGF 1α from plasma and the luminal surface of the Dacron grafts implanted into the canine inferior vene cava

为探讨涤纶人工血管（Ｄａｃｒｏｎ）经自体静脉碎片种植植入体内后腔面是否释放较多６酮前列腺素Ｆ１α（６ＫＰＧＦ１α），种植组１３条犬以自体颈静脉碎片种植Ｄａｃｒｏｎ植入下腔静脉，以全血预凝Ｄａｃｒｏｎ植入８条犬作为对照。于术前、术毕、处死时静脉采血行血浆６ＫＰＧＦ１α，ＴＸＢ２测定。术后定期处死取移植物行光镜与扫描电镜观察及腔面６ＫＰＧＦ１α测定。结果显示：种植组通畅率（６１５％）高于对照组（２５０％），移植物腔面术后二周可形成新内皮层，对照组仅吻合口附近少数内皮细胞。处死时，种植组血浆与移植物腔面６ＫＰＧＦ１α含量均高于对照组、血浆ＴＸＢ２含量低于对照组。提示：自体静脉碎片种植可使Ｄａｃｒｏｎ腔面术后二周形成新内皮、并释放较多６ＫＰＧＦ１α及增加血浆６ＫＰＧＦ１α含量、提高犬下腔静脉重建通畅率。测定血浆６ＫＰＧＦ１α与ＴＸＢ２含量可能有助于间接了解移植物通畅情况。

The aim of this study is to determine whether seeded Dacron with autologous venous tissue fragments shows significant 6-keto-prostglandin F 1α (6 K PGF 1α )production after in vivo implantation.The Dacron grafts seeded with autologous venous fragments were implanted into the inferior vene cava(IVC)of the 13 canines as seeded group;and the control group (8 canines),in which grafts were only preclotted with fresh blood. Plasma 6 K PGF 1α and TXB 2 were assessed at different time.All of the specimens explanted at exsanguination were observed with light microscopy and sanning electron microscopy and the amounts of 6 K PGF 1α from the luminal surface were assessed using ridioimmunoassay. The results showed that the total patency rate of the explanted vessels was higher in seeded group (61.5%) than that in control group ( 25% ),and that endothelial cells lined the whole luminal surface of Dacron at the 14th day after operation in seeded group,but thrombus covered the surface of Dacron at the 14th day in control ones. The level of 6 K PGF 1α from plasma and the luminal surface of Dacron grafts in seeded group was higher,but the level of plasma TXB 2 was lower than that in control group. It can be concluded that seeding Dacron with autologous venous fragments makes a new endothelial lining possible at two weeks,and can release more 6 K PGF 1α and thus lead to an improved patency rate of canine IVC reconstructions,so the graft patency might be determined according to the changes of plasma 6 K PGF 1α and TXB 2 level.