The researchers investigated whether bilioduodenal reflux plays a crucial role in stent occlusion, and reported their findings in the September issue of Endoscopy.
Plastic stents in 100 consecutive patients with various biliary disorders were investigated both macroscopically and cytologically.
In 37 patients with elective stent extraction, the only risk factor for stent occlusion was the duration of stenting.
|Biliary stents capable of preventing duodenobiliary reflux would be beneficial.
Plant material was found as a consequence of duodenobiliary reflux in 38 of the 89 stents with any stent content.
In patients who had two stents, the stent content was found to be identical in 8 of 14 cases.
Investigator U. Weickert, of the University of Witten/Herdecke, said on behalf of fellow authors, "In addition to other mechanisms of biliary stent occlusion, duodenobiliary reflux appears to play an important role."
"A stent design capable of at least partly preventing this type of reflux might be of clinical benefit," it was concluded.