Clinical outcome of a highly flexible duodenal stent for gastric outlet obstruction: A multicenter prospective study

Patient-related adverse events and device failures associated with commercially available enteral or duodenal self-expanding metal stents: an analysis of the MAUDE database

BACKGROUND AND AIMS

Duodenal stents are widely used to treat patients with malignant gastric outlet obstruction (MGOO), most commonly from pancreatic cancer. The WallFlex (Boston Scientific, Natick, Mass, USA) and Evolution (Cook Endoscopy, Winston-Salem, NC, USA) duodenal stents are in widespread use for treating MGOO. The objective of this study was to analyze device failures and patient-related adverse events reported to the U.S. Food and Drug Administration (FDA) for these 2 stents.

METHODS

We analyzed postmarketing surveillance data on the WallFlex and Evolution duodenal stents from January 2000 to January 2022 through the FDA's Manufacturer and User Facility Device Experience (MAUDE) database (https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfmaude/search.cfm).

RESULTS

One hundred fifty-four MAUDE reports were identified and analyzed, from which 176 device failures and 186 patient-related adverse events were identified. Device-related failures for the WallFlex stent were delivery system failure (15.4%) and failure to activate the stent (13.2%). Device failures for the Evolution stent were failure to activate the stent (16.5%) and delivery system failure (15.3%). Patient-related adverse events for the WallFlex stent were perforation (18.9%), death (6.6%), and hemorrhage (3.8%), whereas patient-related adverse events for the Evolution duodenal stent were obstruction (16.3%), perforation (6.3%), aspiration (3.8%), and fragments of broken delivery system left in the patient (3.8%).

CONCLUSIONS

Both stents are associated with device failures such as failure to activate the stent, stent migration, and occlusion by tumor growth. Despite high success rates, duodenal stents can be associated with serious device failures and patient-related adverse events.

Gastroduodenal Stenting with a Flexible Stent Demonstrates Favorable Clinical Effectiveness despite Gradual Expansion: A Multicenter Prospective Study

AIMS

This study aimed to evaluate the effectiveness and safety of stenting with a flexible braided self-expandable metal stent (SEMS) for unresectable malignant gastric outlet obstruction (GOO).

METHODS

Palliative stenting was prospectively carried out at seven university hospitals between October 2017 and August 2020. All procedures were performed using a flexible branded SEMS of the same brand. The primary endpoint was clinical success rate at 7 days after stenting. Secondary endpoints were procedural success rate, adverse events, recurrent gastric outlet obstruction (RGOO), and patient survival time.

RESULTS

Sixty patients were enrolled. The procedural and clinical success rates were 100% and 90%, respectively. RGOO occurred in 15 cases (25%). Adverse events other than RGOO were found in seven cases (12%). The 50% survival time was 75.5 days (range: 52-97 days). Median expansion rates at 1, 3, and 7 days after stenting were 55%, 65%, and 75%, respectively.

CONCLUSIONS

A flexible braided stent woven with relatively thin wires was used for malignant GOO. Despite a gradual expansion with slightly lower expansile force, the stent functioned sufficiently well and showed favorable results. Clinical Trials Registry ID: UMIN000029496.

Self-expandable duodenal metal stent placement for the palliation of gastric outlet obstruction over the past 20 years

INTRODUCTION

Duodenal stent placement is a palliative option for management of malignant gastric outlet obstruction (GOO). In the last 20 years, management of gastrointestinal cancers has considerably changed. It is unknown if these changes have affected clinical outcome of duodenal stent placement.

METHODS

Retrospective cohort study conducted in a tertiary referral center. Patients who underwent duodenal stent placement for GOO-symptoms due to a malignant stricture were included. Primary outcome was GOO-symptom free survival. Secondary outcomes included stent-related adverse event rates. Potential explanatory parameters such as period of stent placement (1998-2009 vs 2010-2019), prior treatments, peritoneal deposits, and stricture length were evaluated using multivariable Cox regression analysis.

RESULTS

A total of 147 patients (62 % male; median age 64 years) were included. After a median of 28 days after stent placement, 82 patients (57 %) had recurrent GOO-symptoms. GOO-symptom free survival was significantly lower in 2010-2019 (P < 0.01). Time period was the only independent predictor for reduced GOO-symptom free survival (HR 1.76, P < 0.01). Stent-related adverse event rates increased over time (1998-2009: 31 % vs 2010-2019: 37 %). Prior treatment with chemotherapy and/or radiotherapy was significantly associated with an increased risk of adverse events (OR 2.53, P = 0.02).

CONCLUSIONS

Clinical outcome of duodenal stent placement did not improve over time. The decreased GOO-symptom free survival and increased adverse event rate in more recent years are probably related to the chemo- and/or radiotherapy treatment provided prior to duodenal stent placement.

Efficacy and safety of endoscopic duodenal stent versus endoscopic or surgical gastrojejunostomy to treat malignant gastric outlet obstruction: systematic review and meta-analysis

Background and study aims  Malignant disease accounts for up to 80 % of gastric outlet obstruction (GOO) cases, which may be treated with duodenal self-expanding metal stents (SEMS), surgical gastrojejunostomy (GJ), and more recently endoscopic-ultrasound-guided gastroenterostomy (EUS-GE). These three treatments have not been compared head-to-head in a randomized trial. Methods  We searched the Embase and MEDLINE databases for studies published January 2015-February 2021 assessing treatment of malignant GOO using duodenal SEMS, endoscopic (EUS-GE) or surgical (laparoscopic or open) GJ. Efficacy outcomes assessed included technical and clinical success rates, GOO recurrence and reintervention. Safety outcomes included procedure-related bleeding or perforation, and stent-related events for the duodenal SEMS and EUS-GE arms. Results  EUS-GE had a lower rate of technical success (95.3%) than duodenal SEMS (99.4 %) or surgical GJ (99.9%) ( P  = 0.0048). For duodenal SEMS vs. EUS-GE vs. surgical GJ, rates of clinical success (88.9 % vs. 89.0 % vs. 92.3 % respectively, P  = 0.49) were similar. EUS-GE had a lower rate of GOO recurrence based on limited data ( P  = 0.0036), while duodenal SEMS had a higher rate of reintervention ( P  = 0.041). Overall procedural complications were similar (duodenal SEMS 18.7 % vs. EUS-GE 21.9 % vs. surgical GJ 23.8 %, P  = 0.32), but estimated bleeding rate was lowest ( P  = 0.0048) and stent occlusion rate was highest ( P  = 0.0002) for duodenal SEMS. Conclusions  Duodenal SEMS, EUS-GE, and surgical GJ showed similar clinical efficacy for the treatment of malignant GOO. Duodenal SEMS had a lower procedure-related bleeding rate but higher rate of reintervention.

Development and validation of a risk score for prediction of clinical success after duodenal stenting for malignant gastric outlet obstruction

BACKGROUND

To develop and validate a risk score for predicting clinical success after duodenal stenting using self-expanding metallic stents (SEMS) for malignant gastric outlet obstruction (GOO).

RESEARCH DESIGN AND METHODS

Consecutive patients who underwent duodenal stenting for malignant GOO were evaluated. Potential predictors of clinical success were determined by uni/multivariate logistic regression analysis.Multiplication of the regression coefficients of the logistic regression model by a factor of two and rounding to obtain easy-to-use point numbers enabling the calculation of the score. Using 10-fold cross-validation, the model was internally validated.

RESULTS

One hundred twelve patients were included. Clinical success was achieved in 93 (83.0%) patients. On multivariate logistic regression, selected age ≤65 years (p = 0.05, 1.5 points), stenosis type I (p = 0.04, 3 points), and pancreatic cancer (p = 0.01, 3.5 points) were significant predictors of clinical success. On the Receiver Operating Characteristic (ROC) analysis, a score of 5 had higher specificity and sensitivity.

CONCLUSION

Our score could be useful at identifying, among poor surgical candidates, patients more likely to benefit from SEMS.

Retroperitoneal Liposarcoma Presenting With Malignant Gastric Outlet Obstruction and Acute Pancreatitis: A Case Report

Dedifferentiated liposarcomas (DDLPS) are rare, high-grade malignancies that usually originate in the retroperitoneum. Frequently, they present as asymptomatic masses, abdominal distention, abdominal pain, and weight loss. They tend to grow significantly and are usually large in size at the time of diagnosis. Surgical resection is the mainstay of treatment; however, local recurrence is common. When unresectable, they can invade local structures and produce a significant mass effect on the adjacent organs. Here we present the first case of malignant gastric outlet obstruction (MGOO) and acute pancreatitis from a retroperitoneal DDLPS.