血管外支架预防猪大隐静脉移植血管再狭窄的实验研究  

Experimental Study of External Stents Preventing Porcine Saphenous Vein Grafts Restenosis

作　　者：郑家豪[1] 潘文标[1] 吕一峰[1] 吴学军[1] 

机构地区：[1]上海交通大学医学院附属仁济医院胸心外科,上海200001

出　　处：《中国胸心血管外科临床杂志》2006年第6期405-408,共4页Chinese Journal of Clinical Thoracic and Cardiovascular Surgery

基　　金：上海市教委资助项目(03BK21);上海市浦东新区科技局资助项目(Pkj2002-60)

摘　　要：目的以猪大隐静脉-颈总动脉旁路移植动物模型为基础，观察涤纶血管外支架支持预防静脉移植血管内、中膜增生的作用。方法将10只25～30kg普通长白猪行双侧大隐静脉-颈总动脉旁路移植术（端侧吻合），一侧静脉移植血管放置涤纶外支架（实验组），另一侧作为对照（对照组）。术后35d取出移植血管进行组织学和免疫组织化学检测。结果对照组静脉移植血管内膜增生较实验组明显增加（0．4872±0．0706mmVS．0．2259±0．0553mm，P〈0．01）；对照组中膜增生亦较实验组增加（0．6246±0．0859mmVS．0．4201±0．0615mm，P〈0．01）；对照组内膜面积是实验组的2倍，中膜面积是实验组的近1.5倍。实验组内膜及中膜内侧区域增殖细胞核抗原（PCNA）、血小板源性生长因子（PDGF）阳性细胞显著减少，PCNA从7．98％±4．06％减少至3．35％±0．95％（P〈0．01），PDGF从9．47％±5．35％减少至2．67％±0．97％（P〈0．01）。结论非限制性涤纶血管外支架可以显著抑制大隐静脉移植血管新内膜及中膜增生，可能预防大隐静脉移植血管的再狭窄。Objective To evaluate the effect of external stents on preventing vein graft neointima formation and medial thickening with non-restrictive macro porous polyester stent around porcine vein grafts. Methods Studies were performed by using ＂white race＂ pigs （n= 10） weight 25-30 kg. All the animals underwent bilateral saphenous vein into carotid artery bypass grafting. In each animal, a maeroporous stent was placed around a graft on one side and a control （unstented） graft on the opposite side. The polyester stent was shaped to cover both anastomoses completely. The size of the stem allowed unrestricted expansion of the graft in initial response to arterial pressure. After 35 days of surgery,all animals were taken to remove the grafts. Graft wall dimensions, platelet- derived growth factor （PDGF） expression and cell proliferation using proliferating cell nuclear antigen （PCNA） were measured on histological sections. Results Stents significantly reduced neointimal thickening （0. 4872 ± 0. 0706 mm vs. 0. 2259± 0. 0553mm,P〈0. 01）and medial thickening （0. 6246±0. 0859mm vs. 0. 4201±0. 0615mm,P〈0. 01）. Stents significantly reduced the percentage of cells expressing PDGF and PCNA. Media, intimal PCNA index was reduced from 7. 980/00± 4. 060/00 to 3.35±0.95%（P〈0.01）, PDGF index was reduced from 9.47%±5.35% to 2.67%± 0.97% （P 〈0. 01）. Conclusion External non-restrictive polyester stent can significantly inhibit neointimal formation and medial thickening, and may prevent late vein grafts restenosis.

关 键 词：冠状动脉旁路移植术 静脉移植物 再狭窄 血管外支架 

分 类 号：R541.4[医药卫生—心血管疾病]