Evaluation of Hepatobiliary Excretion and Enterobiliary Reflux in Rats with Biliary Obstruction Submitted to Bilioduodenal or Biliojejunal Anastomosis

Bilioduodenal and biliojejunal anastomoses are effective for the treatment of biliary obstruction. The objective of this study was to compare the effects of these anastomoses on hepatobiliary excretion and enterobiliary reflux. Enterobiliary reflux and biliary excretion were evaluated respectively after oral administration of technetium (^99mTc) in combination with sodium phytate and intravenous infusion of ^99mTc with diisopropyl-iminodiacetic acid. Enterobiliary reflux occurred to an equal degree in the bilioduodenal and biliojejunal groups. Maximum hepatic activity time (T_max) and radiotracer clearance half-time (T^1/2) were similar in both groups. However, when compared with that found for the sham-operated group, T_max, and T^1/2 were higher in the biliojejunal group (P = 0.02 and P = 0.01, respectively). Histopathological analysis showed marked reduction in ductal proliferation in both groups. These data undermine the theoretical advantages attributed to biliojejunal anastomosis and further the understanding of the pathophysiology of cholangitis that occurs even with patent anastomosis.