The Efficacy of Endoscopic Sphincterotomy after Cholecystectomy in Patients with Sphincter-of-Oddi Dysfunction

Forty-seven patients thought to have dysfunction of the sphincter of Oddi were randomly assigned to undergo endoscopic sphincterotomy or sham sphincterotomy in a prospective double-blind study. All the patients had pain resembling biliary pain, had previously undergone a cholecystectomy, and had clinical characteristics suggesting biliary obstruction. The patients were randomly assigned to the treatment (n = 23) or nontreatment (n = 24) group...