犬胆管壁的应力-应变性扩张构建宽口径胆管的实验研究

目的 探索短期内以持续渐增的局部胆管内压构建局部宽口径胆管的可行性及形态特征.方法 杂交犬12只随机分配到A、B两组中,A组仅在胆总管内放置胆管扩张器作胆汁外引流,B组在胆总管内放置胆管扩张器引流并分别在手术后的第1、8、15、22天向扩张球囊注水,注水容积分别为0.1、0.15、0.2、0.25 ml,扩张球囊以渐增的压力持续扩张1个月.观察两组手术前后血清总胆红素(TB)、丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(ALT)及胆管直径(BDD)、胆管壁及肝组织学病理变化、术后X线胆道造影检查.结果 A、B两组扩张前后及组间比较在TB、ALT、AST及肝组织学方面差异不明显;BDD在A、B两组扩张前后及组间比较差异明显;B组胆管壁增厚,管腔增粗,管壁柔韧性好,肝外胆管以扩张处为中心向邻近胆管方向扩张,胆管壁特殊染色示胶原及弹力纤维排列致密,无断裂.结论 以持续渐增的局部胆管内压扩张局部胆管,构建的胆管管壁厚,管腔粗,胆管壁胶原及弹力纤维排列致密.扩张的局部胆管为犬胆管损伤早期胆肠重建及制备宽大的胆肠吻合口创造了条件.

Application of stress and complaisance distention of bile ducts to construct wide caliber local biliary tract in dogs

Objective To study the feasibility and morphological characteristics of wide caliber of local biliary tract constructed by increasing pressure of local bile duct in a short period of time.Methods Twelve mongrel dogs were randomized into 2 groups.In group A,only inlaid bile duct dilator(IBDD)was placed for biliary drainage in common bile duct.In group B,IBDD was placed in tommort bile duct for biliary drainage and dilated it through affusing 0.1 ml,0.1 5 ml,0.2 ml and 0.25 ml water on postoperative day 1,8,15 and 22,respectively.The expandable ballbladders were kept on being dilated with increasing pressure for a month.Total bilirubin(TB),alanine aminotransferase (ALT),aspartate aminotransferase;aspartate transaminase(AST)of serum,bile duct diameter (BDD),histologic changes of biliary duct wall and hepatic tissue,and postoperative biliary tract contrast were determined before and after operation in both groups.Results There was no significant difference in TB,ALT,AST and histologic changes of hepatic tissue in bilary predilation and postdilation of each group and between group A and group B.There was great difference in BDD in bilary predilation and postdilation of each group and between group A and group B.In group B,the biliary wall was thickened and the lumina of bile duct widened,favorable tenacity of broaden biliary tract was shown.The specific staining of the broadened biliary wall showed that collagen and elastic fibers compacted fine and close and there was no breakage.Conclusion Dilated local bile duct constructed by increasing internal pressure of local bile duct has thick wall,wide caliber and its collagen and elastic fibers compact fine and close.This provides condition to supply early-stage cholangio-jejunostomotic reconstruction of bile duct iniury and create wide stoma for cholangio-jejunostomy in dogs.