Sphincter stenosis and gallstone migration through the biliary tract

Area of Science:

• Gastroenterology
• Biliary system physiology
• Pancreatic duct function

Background:

• Gallstones are common and can cause complications.
• The effect of gallstone passage on the sphincter of Oddi is debated.
• Previous assumptions suggested sphincter insufficiency, not stenosis.

Purpose of the Study:

• To investigate if gallstone passage causes stenosis or insufficiency at the duodenal papilla.
• To determine the impact of gallstone migration on pancreatic juice reflux.
• To clarify the functional changes in the sphincter of Oddi post-gallstone passage.

Main Methods:

• Studied meal-stimulated pancreatic enzyme activity in T-drain bile from the common bile duct in three patient groups post-cholecystectomy.
• Group A: Gallbladder stones only.
• Group B: Gallbladder and bile duct stones.
• Group C: Acute gallstone-induced pancreatitis (evidence of duodenal migration).

Main Results:

• Reflux of pancreatic juice into the common bile duct was absent in Group A.
• Occasional reflux was observed in Group B.
• Strikingly increased reflux was noted in Group C.
• Gallstone passage correlated with increased pancreatic juice reflux.

Conclusions:

• Passage of gallstones through the biliary tract causes functional stenosis of the sphincter of Oddi.
• This stenosis facilitates a common channel between the pancreatic and common bile ducts.
• The findings do not support the hypothesis of sphincter insufficiency.