Endosonography-guided transmural drainage of pancreatic fluid collections: comparative outcomes by stent type

Background Pancreatic fluid collections (PFCs), including walled-off necrosis (WON), are commonly described sequelae of pancreatitis. Endosonography-guided PFC drainage can be performed using plastic stents (PS), fully covered self-expanding metal stents (FCSEMS), or lumen-apposing metal stents (LAMS). We performed a retrospective study comparing clinical outcomes and adverse events by stent type. Methods In this historical cohort, patients undergoing endosonography-guided PFC drainage from 2010 to 2019 were divided into groups: those treated with (1) PS, (2) FCSEMS, and (3) LAMS. Clinical success, the primary outcome, was defined as complete resolution or size reduction of ≥ 50%, with resolution of symptoms and no reintervention required at 3 months following the index procedure. Adverse events (AEs) and procedure times were also evaluated. Results Fifty-eight patients were included. Procedure times were significantly shorter with LAMS (21.4 ± 10.8 min versus 53.0 ± 24.4 min for FCSEMS and 65.9 ± 23.4 min for PS, p < 0.001). Clinical success rates for WON were higher with LAMS compared with FCSEMS (95.7% vs 66.7%, respectively; p = 0.04). For all PFCs, treatment with LAMS trended towards higher clinical success rates compared with PS and FCSEMS (96.3% vs 81.8% vs 77.8%, respectively; p = 0.14). Early AEs (within 1 week) occurred at significantly lower rates in the LAMS group compared to PS and FCSEMS (0% vs 33.3% vs 10.6%, respectively; p = 0.006), as did late AEs (7.4% vs 44.5% vs 40%, respectively; p = 0.01). Conclusions LAMS is superior in terms of WON clinical success, favorable in terms of lower adverse event profile, and shorter in terms of procedural time compared to FCSEMS and PS. LAMS can be considered as an initial approach for WON, given that clinical success in WON is lower when using PS or FCSEMS, though more high-quality data are needed.