Large-diameter balloon dilation after endoscopic sphincterotomy for removal of difficult bile duct stones

Background and study aims: Endoscopic sphincterotomy followed by extraction using a Dormia basket or an extraction balloon catheter is the procedure that is generally used for the removal of bile duct stones. This is not successful in all patients, however, and some stones have to be extracted using lithotripsy devices. In an attempt to avoid mechanical lithotripsy, we used large-diameter balloons after sphincterotomy for removing stones that could not be extracted using the conventional methods.

Patients and methods: In this retrospective pilot study, large-diameter (15-mm, 18-mm, or 20-mm maximum sizes) balloon dilation of the sphincterotomy site was performed in 50 patients in whom bile duct stones could not be removed by endoscopic sphincterotomy and Dormia basket or balloon catheter extraction.

Results: The stones varied in size from < 15 mm to 25 mm. Common bile duct stones could be removed in all the patients using the large-diameter balloon technique. A Dormia basket or an extraction balloon catheter was required for removal of stones in 29 patients (58 %); and mechanical lithotripsy was required in five patients (10 %). Minor oozing of blood was seen in 16 patients (32 %), but the ooze stopped spontaneously during the endoscopy. Melena occurred in two patients and major bleeding requiring surgery occurred in one patient. Mild acute pancreatitis that resolved with conservative management occurred in four patients (8 %). There were no perforations and no deaths.

Conclusions: Large-diameter balloon dilation of the sphincterotomy site is an effective procedure for removal of bile duct stones that cannot be extracted by endoscopic sphincterotomy and conventional extraction devices. Mechanical lithotripsy could be avoided in the majority of these patients using this approach.

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