Acta Cirurgica Brasileira
On-line version ISSN 1678-2674
PANDOLFI JR., H. et al. EVOLUTION OF SECONDARY BILIARY FIBROSIS IN RATS TREATED WITH BILE-DUODENAL SHUNT OR ROUX-EN-Y BILE-JEJUNAL SHUNT WITH EXCLUDED LOOP OF 5, 10 AND 15 CENTIMETERS. Acta Cir. Bras. [online]. 2001, vol.16, suppl.1, pp. 47-51. ISSN 1678-2674. http://dx.doi.org/10.1590/S0102-86502001000500015.
The type of bile-digestive shunt used for the treatment of cholestasis can be affect the process of repair of liver damage. We evaluated the performance of bile-duodenal and Roux-en-Y bile-jejunal shunts with excluded loop of different lengths in the process of liver repair in rats with secondary biliary fibrosis. Thirty Wistar rats, after 15 days of biliary obstruction (BO), were divided into 5 groups of 6 animals: the BO group, duodenal shunt group (BDS) and with jejunal shunt, with excluded loop of 5 cm (BJS5 group), 10 cm (BJS10 group) and 15 cm (BJS15 group), and reevaluated 3 months later. Six animals were submitted to sham surgery (SHAM group). All animals were submitted to qualitative and morphometric histological evaluations of the liver, to blood biochemical and to microbiological bile analysis, and to a study of hepatic mitochondrial function. Liver and spleen weights (g/kg body weight) were also determined. In the statistical analysis, the level of significance was set at 5%. The animals of the BO group showed a significant increase in median values of total bilirubins (9.6 mg/dl), alkaline phosphatase (AP) (296 U/ml) and aminotransferases (133 U/ml for ALT and 419 U/ml for AST) compared to the SHAM group.with normalization after all the shunt modalities used. A significant increase in liver and spleen weight occurred in the BO group (medians of 49.85 and 5.71, respectively) compared to the SHAM group (medians of 30.0 and 3.04 g/kg). There was a significant regression of liver weight in all the treatments, whereas spleen weight regressed only in the animals treated with a BJS (median values of 2.53 for BJS5, 2.82 for BJS10 and 2.93 for BJS15). There was a significant increase in estimated weight (g/kg body weight) of bile ducts, of fibrosis and of hepatocytes in animals of BO group (medians of 1.30; 10.03 and 37.0, respectively) compared to animals of SHAM group (medians of 0.03; zero and 29.37). There was a significant regression of estimated weight of bile ducts and of fibrosis, with respective median values of 0.22 and 0.22 in BDS group, of 0.45 and 3.31 in BJS5 group, and of 0.22 and 5.0 in BJS15 group. There was a significant regression of estimated hepatocyte weight only in BJS5, BJS10 and BJS15 groups, with median values of 31.93, 24.46 and 28.52 g/kg body weight. In all types of treatment a mixed inflammatory infiltrate occurred in the portal spaces, associated with enterobiliary reflux and with bacterial contamination of the bile. There was a significant increase in oxygen consumption by hepatic mitochondria in states 3 and 4 in BO group (respective medians of 101.55 and 31.05 nanoatoms O2/mg protein/min) compared to SHAM group (medians of 57.22 and 15.51). The O2 consumption normalized only in the animals of BJS15 group (medians of 52.38 and 14.8). The performance of the BJS indicates the importance of the evaluation of alternatives that might minimize the contact of enteric content with the biliary tree.
Keywords : cholestasis; biliary fibrosis; portal hypertension; bile-digestive shunt.