title: Effect of endoscopic sphincterotomy on bile lithogenicity in patients with gallbladder in situ.
abstract: OBJECTIVE
  Endoscopic sphincterotomy results in a continuous flow of bile into the duodenum and consequently leads to an increase in the frequency of enterohepatic bile acid cycling. Because bile acids are the driving force of biliary secretion, sphincterotomy may affect bile genesis. The present study was undertaken to determine the influence of endoscopic sphincterotomy on bile composition.
  
  
  METHODS
  The cholesterol saturation index and the bile acid pattern were determined in the gallbladder bile of lithiasis patients with (group III) or without sphincterotomy (group I), and in the hepatic bile of patients with gallbladder in situ who were checked at 3 months after the endoscopic procedure (group II). Stones from each patient were examined for chemical composition and microstructure.
  
  
  RESULTS
  All the patients had cholesterol stones. After endoscopic sphincterotomy the molar percentages of cholesterol in the gallbladder bile of group III and in the hepatic bile of group II were significantly lower (-31% and -46% respectively) than in group I. Similarly, the cholesterol saturation index in the hepatic bile (0.79) and the gallbladder bile (0.86) from patients who had undergone sphincterotomy indicated undersaturation whereas bile from group I was oversaturated (1.25). On the other hand, endoscopic sphincterotomy did not modify the hydrophobicity index of the bile acid pool, even though deoxycholate content increased.
  
  
  CONCLUSIONS
  Endoscopic sphincterotomy causes a marked decrease in the lithogenicity of bile and thus may prevent the risk of recurrence of cholesterol lithiasis.
authors.affiliation: Department of Hepato-Gastroenterology, L'Archet II Hospital, Nice, France.
authors.forename: F X
authors.initials: FX
authors.lastname: Caroli-Bosc
authors.forename: J C
authors.initials: JC
authors.lastname: Montet
authors.forename: L
authors.initials: L
authors.lastname: Salmon
authors.forename: J F
authors.initials: JF
authors.lastname: Demarquay
authors.forename: R
authors.initials: R
authors.lastname: Dumas
authors.forename: A M
authors.initials: AM
authors.lastname: Montet
authors.forename: J L
authors.initials: JL
authors.lastname: Bernard
authors.forename: J P
authors.initials: JP
authors.lastname: Delmont
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001646:Bile / Q000737:chemistry*; D001647:Bile Acids and Salts / Q000032:analysis*; D002760:Cholangiopancreatography, Endoscopic Retrograde; D002763:Cholecystectomy; D002769:Cholelithiasis / Q000737:chemistry / Q000175:diagnosis / Q000601:surgery*; D002784:Cholesterol / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D005260:Female; D005704:Gallbladder / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D010743:Phospholipids / Q000032:analysis; D012086:Reoperation; D012189:Retrospective Studies; D055502:Secondary Prevention; D016717:Sphincterotomy, Endoscopic; D016896:Treatment Outcome; D014463:Ultrasonography
chemical_list: D001647:Bile Acids and Salts; D010743:Phospholipids; D002784:Cholesterol