Endoscopic Transluminal Drainage and Necrosectomy by Using a Novel, Through-the-scope, Fully Covered, Large-bore Esophageal Metal Stent: Preliminary Experience in 10 Patients

Background: Interventions for necrotizing pancreatitis have undergone a recent paradigm shift toward minimally invasive techniques, including endoscopic transluminal necrosectomy (ETN). The optimal stent for endoscopic transmural drainage remains unsettled.

Objective: To evaluate a novel large-bore, fully covered metal through-the-scope (TTS) esophageal stent for cystenterostomy in large walled-off necrosis (WON).

Design: Retrospective case series.

Setting: Single tertiary care academic center.

Patients: Ten patients with large (>10 cm) WON collections who underwent endoscopic transmural drainage and ETN.

Intervention: Initial cystenterostomy was performed by using EUS, and in the same session, a TTS (18 × 60 mm), fully covered esophageal stent was placed to create a wide-bore fistula into the cavity. In 1 or more later sessions, the stent was removed, and ETN was performed as needed.

Main Outcome Measurements: Technical and clinical success rates and adverse events.

Results: The TTS stent was successfully deployed at the initial cystogastrostomy in all 10 patients. All patients had large WON (median size 17 cm, range 11-30 cm) and underwent intervention at a median of 30 days (range 12-117 days) after onset of acute pancreatitis. Resolution of WON was achieved in 9 of the 10 patients (90%) after a median of 3 endoscopic sessions. There were no early adverse events. Late adverse events occurred in 3 patients (30%); worsening of infection from stent migration and occlusion of cystogastrostomy (2 patients), and fatal pseudoaneurysmal bleeding from erosion of infected necrosis into a major artery distant from the stent (1 patient). The stent was easily removed in all the cases after resolution or improvement of the necrotic cavity.

Limitations: Retrospective, single-center evaluation of a small number of cases. No comparative arm to determine the relative efficacy or cost-effectiveness of these stents compared with conventional plastic stents.

Conclusions: Endoscopic therapy using a large-bore TTS, fully covered esophageal stent is feasible for use in the treatment of large WON. Further studies are needed to validate these findings.