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Updated: Feb 4, 2026

Monitoring the Wall Mechanics During Stent Deployment in a Vessel
Published on: May 8, 2012
Lumen-apposing metal stents (LAMS) versus plastic stents for EUS-guided drainage of walled-off necrosis (WON)
Hui-Yun Zhu1, Pei Xie1,2, Ying-Xiao Song1
1Department of Gastroenterology, Changhai Hospital, Second Military Medical University/ Naval Medical University, 168 Changhai Road, Shanghai, 200433, China.
Background:
Endoscopic ultrasonography (EUS)-guided drainage has become the first-line therapy for late peri-pancreatic fluid collection (PFC). Double pigtail plastic stents (DPPS) and lumen-apposing metal stents (LAMS) are commonly used for PFC drainage. Recently, a multi-institutional consensus on PFC drainage has recommended that LAMS should be the standard care for patients with walled-off necrosis (WON). However, given the poor quality of evidence, we aim to perform a large-scale randomized controlled trial to determine whether LAMS is superior to DPPS for WON drainage.
Methods/Design:
The study is an open-label, prospective, parallel-group, superiority, multicenter randomized controlled trial. Two hundred and fifty-six patients with WON who will attend 18 tertiary hospitals in China will be randomly allocated to the LAMS or DPPS group before the procedure. The primary endpoint is the clinical success at one month after drainage (reduction in the size of WON to < 2 cm). Secondary endpoints include technical success, operation time, recurrence, adverse events, and secondary interventions.
Discussion:
The LVPWON trial is designed to determine whether LAMS is effective, safe, and superior to DPPS for WON drainage.
Trial Registration:
ClinicalTrials.gov, NCT03027895 . Registered on 14 January 2017.
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