Suspended Overlength Biliary Stents Preventing Duodenobiliary Reflux in Patients With Biliary Stricture

Not Applicable

• Conditions: Bile Duct Stricture
• Interventions: Procedure: ordinary plastic biliary stents; Procedure: 26cm suspended overlength biliary stents; Procedure: 30cm suspended overlength biliary stents

• Registration Number: NCT03310554
• Lead Sponsor: Peking University Third Hospital

Brief Summary

Endoscopic insertion of plastic or metal stents in bile duct under endoscopic retrograde cholangiopancreatography is a well established treatment of distal malignant biliary obstruction.Biliary stents are widely used to relieve symptoms of malignant biliary stricture.Now, the mainly used biliary stents include plastic and metal stents. The main limitation of long time plastic stents is stents occlusion. Biliary plastic stents are changed every 2 to 3 months due to an expected median patency from 77 to 126 days.Metal stents present a lower risk of recurring biliary occlusion, yet high cost and stents occlusion are eventually inevitable. The mechanism of biliary stents occlusion include biliary sluge of the accumulation of bacteria and duodenal biliary reflux .The anti-reflux barrier of Oddi's sphincter disappears after the insertion of biliary stents and the presure in bile duct lowers the duodenals, which cause the retrograde flow of duodenal material into the biliary ducts. Besides, ordinary biliary plastic stent is short which can also shortens the length of duodenal biliary reflux . Therefore, trying to prevent the duodenal biliary reflux is very important in reducing biliary stents occlusion and it is gradually concerned by clinical researchers. Some studies have showed that plastic stents with antireflux valves can effectively reduce the biliary stent stricture and prolong the stents patency, which means reducing duodenobiliary reflux is surely useful for keeping biliary stent patency.So,we assume to explore an innovatively suspended overlength biliary stents (made from nasobiliary tube with length of 26cm or 30cm) as substitution for ordinary biliary plastic stent to prevent the duodenobiliary reflux by extending the length of duodenal content reflux and avoid the stents shift via suspending in intrahepatic duct. In this study,we will design a randomized controlled trial to compare the patency of different length of suspended overlength biliary stents and ordinary plastic biliary stents in patients with distal malignant biliary obstruction to evaluate the effect and safety of suspended overlength biliary stents for the prevention of duodenobiliary reflux and the effect of different length of the stents.

Detailed Description

Endoscopic insertion of plastic or metal stents in bile duct under endoscopic retrograde cholangiopancreatography is a well established treatment of distal malignant biliary obstruction.Biliary stents are widely used to relieve symptoms of malignant biliary stricture.Now, the mainly used biliary stents include plastic and metal stents. The main limitation of long time plastic stents is stents occlusion. Biliary plastic stents are changed every 2 to 3 months due to an expected median patency from 77 to 126 days.Metal stents present a lower risk of recurring biliary occlusion, yet high cost and stents occlusion are eventually inevitable. The mechanism of biliary stents occlusion include biliary sluge of the accumulation of bacteria and duodenal biliary reflux .The anti-reflux barrier of Oddi's sphincter disappears after the insertion of biliary stents and the presure in bile duct lowers the duodenals, which cause the retrograde flow of duodenal material into the biliary ducts. Besides, ordinary biliary plastic stent is short which can also shortens the length of duodenal biliary reflux . Therefore, trying to prevent the duodenal biliary reflux is very important in reducing biliary stents occlusion and it is gradually concerned by clinical researchers. Some studies have showed that plastic stents with antireflux valves can effectively reduce the biliary stent stricture and prolong the stents patency, which means reducing duodenobiliary reflux is surely useful for keeping biliary stent patency .So,we assume to explore an innovatively suspended overlength biliary stents (made from nasobiliary tube with length of 26cm or 30cm) as substitution for ordinary biliary plastic stent to prevent the duodenobiliary reflux by extending the length of duodenal content reflux and avoid the stents shift via suspending in intrahepatic duct. In this study,we will design a randomized controlled trial to compare the patency of different length of suspended overlength biliary stents and ordinary plastic biliary stents in patients with distal malignant biliary obstruction to evaluate the effect and safety of suspended overlength biliary stents for the prevention of duodenobiliary reflux and the effect of different length of the stents.

The investigators will recruit patients according to admission criteria and exclusion criteria. Eligible patients with distal malignant biliary obstruction will be randomly divided into 26cm suspended overlength biliary stents group (experimental group) 、30cm suspended overlength biliary stents group (experimental group) and ordinary plastic biliary stents group (control group).The test groups will be placed the 26cm or 30cm suspended overlength biliary stents in introhepatic bile duct in ERCP. The control group will be placed ordinary plastic biliary stents in ERCP. The primary endpoint is the duration of stent patency and the rate of stent occlusion.The secondary outcomes include the mortality of each group, adverse events and the rate of technical success.

Study Timeline

• Study First Submitted: 2017-10-11
• Study First Submitted QC: 2017-10-11
• Study First Posted: 2017-10-16
• Study Start: 2018-01-11
• Primary Completion: 2021-03-10
• Status Verified: 2021-08
• Last Update Submitted: 2021-08-10
• Last Update Posted: 2021-08-11
• Study Completion: 2021-09-30

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 117

Inclusion Criteria

• Unresectable extrahepatic malignant biliary stricture,available for insertion of biliary stents in ERCP to alleviate biliary stricture.

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Exclusion Criteria

1. Patients agree with metal biliary stents;
2. Patients with biliary stricture need double or multiple stents inserted;
3. Patients with previous surgical drainage procedure;
4. Patients with resectable biliary occlusion;
5. A guidewire could not be passed through the stricture;
6. Patients with duodenal obstruction and duodenal endoscopy could not be reached to papillary.;
7. Patients with any contraindication to endoscopic procedures or refuse informed consent

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
ordinary plastic biliary stents group	ordinary plastic biliary stents	-
26cm suspended overlength biliary stents group	26cm suspended overlength biliary stents	-
30cm suspended overlength biliary stents group	30cm suspended overlength biliary stents	-

Primary Outcome Measures

Name	Time	Method
stent patency and stent occlusion rate	12 months after ERCP	Patients with symptoms of cholangitis and worsening liver function tests suggestive of cholestasis are considered as premature stent occlusion.

Secondary Outcome Measures

Name	Time	Method
adverse events	12 months after ERCP	Adverse events include complications of post ERCP such as pancreatitis,biliary infection, bleeding, perforation and stent migration etc.
the rate of technical success	12 months after ERCP	Technical success is defined as successful insertion of the stent into the bile duct during ERCP.
mortality of each group	12 months after ERCP	We will compare the mortality of each group after the insertion of biliary stents.

Trial Locations

Locations (1)

Peking University Third Hospital; 🇨🇳 Beijing, Beijing, China