Pull-in small bile duct's choledochojejunostomy in rabbits

Objective To investigate the effect of Pull in choledochojejunostomy which apllied in rabbits' Small bile duct construction on prevention of anastomosis stenosis and potential mechanisms.Methods A total of 21 rabbits were randomly assigned to three groups(n=7).Group A underwent a simple laparotomy (SL),group B biliary-enteric sutured by mucosa to mucosa Choledochojejunostomy (CJ) and group C Pull-in Choledochojejunostomy(PCJ).TBil and DBil were test in 2,4,8 weeks.The tissue of bile duct and anastomotic stoma were collected after Rabbits was killed in 8 weeks.The diameter of bile duct lumen,anastomotic stoma and the thickness of bile duct were measured respectively.Pathological changes of anastomotic stoma were observed and ki67 expression was studied by Immunohistochemical staining.Results (1)Bilirubin level was nomal in group A and C,but significantly higher in group B(P＜0.01).(2)Anastomotic stoma in group C was larger than that in group A and even more than that(completely closed) in group B.There was also statistically significant difference in the diameter of anastomotic stoma,C＞A＞B(P＜0.01).The diameter of bile duct lumen and the thickness of bile duct showed the similar results,B＞C＞A(P＜0.01).(3) As for the inflammatory studies,Group B was observed with significant infiltrated neutrophils compared with group C.Furthermore,cytokine studies showed that the expression of Ki67 index around anastomosis was significantly difference among three groups,B＞C＞A(P＜0.01).Conclusions The studies suggested that pull-in choledochojejunostomy which apllied in rabbits' small bile duct reconstruction could offer some beneficial effect in preventing anastomotic stoma stenosis.The mechanism might be through reducing the inflammatory reaction and restraining excessive hyperplasia in the area around anastomotic stoma. Key words: Portoenterostomy, hepatic;  Stomas