[Intestinal microflora and bile acids following biliary tract reconstruction]

Area of Science:

• Gastroenterology
• Surgical Innovation
• Microbiology

Context:

• Biliary reconstruction techniques (B-I and B-II) are crucial surgical procedures.
• Understanding their impact on intestinal microflora and bile acid metabolism is vital for patient outcomes.
• Previous studies have not fully elucidated the microbial and biochemical changes post-reconstruction.

Purpose:

• To compare the effects of B-I (cholecystoduodenostomy, cholecystojejunostomy) and B-II (Roux-Y cholecystojejunostomy) biliary reconstruction on jejunal microflora and bile acid composition in dogs.
• To investigate the relationship between bacterial overgrowth and bile acid changes in the jejunum following different reconstruction types.
• To assess the risk of ascending cholangitis associated with each reconstruction method.

Summary:

• Dogs undergoing B-II reconstruction showed significantly higher incidences of gram-positive, gram-negative, and anaerobic bacteria in jejunal fluid compared to B-I reconstruction.
• Unconjugated and secondary bile acids increased in jejunal fluid more frequently in dogs with B-II reconstruction, correlating with bacterial overgrowth.
• B-I reconstruction (cholecystoduodenostomy and cholecystojejunostomy) demonstrated lower bacterial presence and more stable bile acid profiles.

Impact:

• The findings indicate that B-II biliary reconstruction may predispose to bacterial overgrowth and altered bile acid metabolism.
• This elevated risk of microbial imbalance and biochemical changes suggests B-II is inferior to B-I in preventing complications such as ascending cholangitis.
• Results provide critical insights for surgical technique selection in biliary reconstruction to minimize post-operative risks.