Impact of Transmural Plastic Stent on Recurrence of Pancreatic Fluid Collection After Metal Stent Removal in Disconnected Pancreatic Duct

Study Overview
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Brief Summary
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Walled of necrosis (WON) is severe local complication of acute necrotizing pancreatitis. Disconnected pancreatic duct syndrome(DPDS) is commonly seen (50-60%) after necrotizing pancreatitis and has long term implication like recurrent pancreatic fluid collections (PFC)] requiring re-intervention. Incidence of recurrent PFC is more common in patients with DPDS (17-50%) compared to others. Studies has shown permanent in-dwelling transmural stent reduces recurrence of PFC (1.7% vs 17.4%, p<0.001). Nowadays,WON is effectively managed with endoscopic step up approach (96%). Several studies showed dedicated self-expandable metal stent (SEMS) are effective compared to the plastic stents in management of WON with decreased need of re-intervention. However, SEMS cannot be kept for longer duration because of associated adverse events. So, experts recommend to remove SEMS within 4-6 weeks of placement. Considering this background, study is planned with aim to see the effect of transmural plastic stenting on recurrence of PFC after SEMS removal in walled off necrosis with DPDS.

Detailed Description
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Acute necrotizing pancreatitis (ANP) is lethal complication and account for 10-20% of total pancreatitis. Necrotic collection is seen in majority of ANP and >50% of necrotic collection transform into Walled of necrosis (WON). Management of WON is challenging and under progressive evolution. With the advent of step up approach WON is effectively managed with greater success. Various studies and meta-analysis proved the efficacy of dedicated self-expandable metal stents (SEMS) over plastic stent in WON management. Disconnected pancreatic duct syndrome (DPDS) is late complication of necrotizing pancreatitis and increasingly identified after necrosectomy. DPDS is defined as complete disruption of the main pancreatic duct, resulting in a variable portion of the upstream pancreatic gland becoming isolated from the main pancreatic duct downstream. Ductal disruption leads to accumulation of pancreatic juice forming pancreatic or peri-pancreatic fluid collection. Incidence of recurrence of PFC in DPD is   50%. DPDS is a separate clinical entity which demands special strategic approach and requires frequent re-intervention (surgical/endoscopic). Treatment option for DPDS is controversial and not yet clearly defined. Studies have shown that long term transmural plastic stent placement can reduce the recurrence rate (Stent removed-17% vs stent left behind-1.7%). So, some experts recommend that transmural stents can be left in situ indefinitely to decrease recurrence of PFC. Nowadays, SEMS are widely used for management of WON. However, metal stents cannot be kept for longer period because of increasing adverse events associated with longer duration (impaction/burring of SEMS in gastric wall, bleeding). So, recommendation is to remove SEMS as early as possible (within 4-6 weeks of drainage). Considering this fact, study is planned to evaluate the effect of transmural plastic stenting on recurrence of PFC after SEMS removal in walled off necrosis with DPDS. This will be randomised control study in patients with WON with DPDS who underwent SEMS drainage. After removal of SEMS patients with documented DPDS (magnetic resonance pancreatography and endoscopic retrograde pancreatography) will be randomised into 2 arms. In study arm after SEMS removal transmural plastic stent will be placed in to the cavity and in control arm SEMS will be removed with no transmural stenting. Thereafter patients will be followed at 3 months,6 months and yearly.

Official Title
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Does Transmural Plastic Stenting Prevent the Recurrence of Pancreatic Fluid Collection After Metal Stent Removal in Walled Off Necrosis With Disconnected Pancreatic Duct Syndrome ? -Prospective Randomized Controlled Trial

Conditions
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Acute Pancreatitis Necrotizing

Intervention / Treatment
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* Device: Transmural Plastic stenting


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All the patient who underwent EUS guided drainage with metal stent DPDS on MRCP & ERCP Exclusion Criteria: Unwillingness to give written informed consent MRCP/ERCP-PD stricture ? (mimics DPD), leak Bleeding diathesis (Coagulopathy & thrombocytopenia) chronic pancreatitis

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Transmural stenting<br>In patients of walled off necrosis with disconnected pancreatic duct syndrome, metal stent will be removed at 3-4 weeks followed by transmural plastic stenting in the residual cavity. | Device: Transmural Plastic stenting<br>* After metal stent removal in patients of disconnected pancreatic duct syndrome, transmural plastic- double pig tail stent will be placed into the residual necrotic cavity with the standard duodenoscope.<br>|
| No Intervention: No stenting<br>In patients of walled off necrosis with disconnected pancreatic duct syndrome, metal stent will be removed at 3-4 weeks without any further intervention. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Recurrence of PFC | In the study will see the re-ccurence of fluid collection in control and study arm | 3 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Technical Success | complication associated with deployment of transmural plastic, stent migration,recurrence of pancreatic fluid collection at 6 months and 1 year,new onset diabetes mellitus | 24 Months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Walled of necrosis