What metal stent size is used for an EUS-directed trans-gastric ERCP (EDGE) in a patient with a Roux-en-Y gastric bypass?

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EDGE Procedure Stent Size for ERCP in Gastric Bypass Patients

For EUS-directed transgastric ERCP (EDGE) in Roux-en-Y gastric bypass patients, use a 20-mm diameter lumen-apposing metal stent (LAMS) with endoscopic suturing for fixation to minimize migration risk and maximize procedural success. 1, 2

Optimal Stent Specifications

A 20-mm LAMS is superior to 15-mm stents for EDGE procedures, as smaller diameter stents (15 mm) are independently associated with a 5-fold increased risk of intraprocedural stent migration (odds ratio 5.36,95% CI 1.29-22.24, P = .021). 1

The standard LAMS dimensions used include:

  • Inner diameter: 20 mm (preferred) or 15 mm 1, 3
  • Saddle length: 10-15 mm 4
  • Bilateral anchor flanges: 29 mm (for 20-mm stent) or 24 mm (for 15-mm stent) 4

Critical Technical Considerations

Stent Fixation is Essential

Endoscopic suturing of the LAMS is protective against migration and should be performed routinely, particularly for same-session procedures. 3, 2 In a multicenter study of 37 patients undergoing same-session EDGE with sutured 20-mm LAMS, there were zero episodes of stent dislodgement or delayed migration, compared to 8.6% migration rates without fixation. 1, 2

  • Use 2 endoscopic sutures for optimal fixation (used in 89.2% of successful cases) 2
  • Single suture may be acceptable if technical constraints exist (used in 10.8% of cases) 2

Single-Session vs. Dual-Session Approach

Same-session EDGE (SS-EDGE) with a sutured 20-mm LAMS achieves 100% technical success and allows immediate intervention for urgent indications like cholangitis, avoiding the traditional 2-4 week wait for fistula maturation. 2

For non-urgent cases, dual-session EDGE remains an option:

  • Median interval between sessions: 17 days 3
  • 64% of patients in multicenter series underwent dual-session approach 3

Access Route Selection

Gastrogastric fistula is the most common access route (70.3% of cases), created between the gastric pouch and excluded stomach. 2

Jejunogastric fistula is the alternative (29.7% of cases), connecting the Roux limb to the excluded stomach. 2

The choice depends on endoscopic visualization and anatomic proximity—select the location with closest apposition between lumens for safe LAMS deployment. 3

Procedural Success and Safety Profile

Technical success of LAMS placement exceeds 99% (171/172 patients in the largest multicenter series), with clinical success of pancreaticobiliary intervention at 95%. 5

Mean procedure time is 65-97 minutes, depending on complexity of the intervention. 3, 5

Adverse Event Profile

Overall adverse event rate is 10.6% with sutured 20-mm LAMS, with no severe perforations when proper technique is used. 2

Most common complications:

  • Stent migration: 17% without fixation 5 vs. 0% with suturing 2
  • Post-procedural bleeding: 8.1% (typically managed conservatively) 2
  • Cholangitis: 2.7% 2

Post-Procedure Fistula Management

LAMS should be removed after a mean indwell time of 69 days once the pancreaticobiliary intervention is complete. 5

Endoscopic fistula closure should be performed in 40% of patients at the time of LAMS removal to prevent persistent fistula. 5

Persistent fistula occurs in 31% of assessed patients, with longer LAMS indwell time being a significant predictor. 5 However, these fistulas are successfully managed endoscopically in the vast majority of cases. 3, 2

Weight Considerations

Average weight gain while LAMS is in place is 12 pounds, though 59.4% of patients gain less than 5 pounds, suggesting minimal impact on bariatric outcomes when LAMS is removed promptly. 5

Common Pitfalls to Avoid

  • Do not use 15-mm LAMS without fixation for same-session procedures—this combination has unacceptably high migration rates 1
  • Do not leave LAMS in place beyond necessary duration—prolonged indwell time increases persistent fistula risk 5
  • Do not proceed without endoscopic suturing capability for same-session EDGE—migration risk is too high without fixation 3, 2
  • Do not attempt EDGE without therapeutic echoendoscope with 3.7-mm accessory channel required for LAMS delivery system 4

References

4
Guideline

Guideline Directed Topic Overview

Dr.Oracle Medical Advisory Board & Editors, 2025

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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