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[Incidence and relation of endoscopic sphincterotomy to the proximal migration of biliary prostheses].

BACKGROUND
Endoprostheses are commonly used in the treatment of biliary disorders. The frequency of and potential risk factors for stent migration, however, remain largely unknown.


OBJECTIVE
To determine how often biliary duct stents migrate proximally and to quantify the influence of specific risk factors on the occurrence of stent migration. PATIENTS METHODS AND RESULTS: We analyzed the occurrence of stent migration among the 410 stents for which follow-up data were available between January 1995 to December 1998. In 272 cases, we performed endoscopic sphincterotomy. Results demonstrated incidence rates of 4.4% for proximal biliary stent migration iatrogenic strictures were significantly associated with proximal biliary stent migration.


CONCLUSIONS
Iatrogenic strictures were significantly associated with proximal common bile duct migration and the association between sphincterotomy and proximal migration failed to reach statistical significance.