Ulcer Disease in Excluded Segments After Roux-en-Y Gastric Bypass: Updated Review

Overview

Ulcer disease in the excluded stomach and duodenum following Roux-en-Y gastric bypass (RYGB) is rare but can cause severe complications such as bleeding and perforation. This review summarizes 54 reported cases, highlighting clinical presentations, pathophysiology, and treatment challenges unique to the altered anatomy post-RYGB.

Background

Bariatric surgery, particularly RYGB, is increasingly performed worldwide for morbid obesity and type 2 diabetes management. RYGB alters gastrointestinal anatomy by creating a small gastric pouch and excluding the remnant stomach and duodenum from food passage, which complicates access and diagnosis of peptic ulcer disease (PUD) in these segments. While marginal ulcers at the gastrojejunal anastomosis are well-studied, ulcers in excluded segments remain less understood, with limited data mostly from case reports and small series. Understanding the incidence, risk factors, and clinical features of ulcer disease in excluded segments is critical for timely diagnosis and management.

Data Highlights

Key Findings

• Ulcer disease in excluded stomach and duodenum post-RYGB is rare but often presents with severe complications such as bleeding and perforation.
• The majority of reported cases involve females, with symptom onset ranging widely from months to decades after surgery.
• Despite decreased gastrin levels post-RYGB, acid production persists in the excluded stomach, maintaining an acidic environment conducive to ulcer formation.
• Altered anatomy leads to loss of nutrient buffering and reduced pancreatic bicarbonate secretion, increasing mucosal vulnerability.
• Pharmacokinetic changes after RYGB reduce proton pump inhibitor absorption and efficacy, complicating ulcer prevention and treatment.
• Additional risk factors include NSAID use, smoking, and Helicobacter pylori infection, which exacerbate mucosal injury in excluded segments.

Clinical Implications

Clinicians should maintain a high index of suspicion for ulcer disease in excluded segments in post-RYGB patients presenting with upper abdominal pain, bleeding, or signs of sepsis. Diagnostic challenges due to altered anatomy necessitate tailored imaging and endoscopic approaches. Awareness of altered acid production and PPI pharmacokinetics is essential for effective prevention and management strategies. Avoidance of NSAIDs and smoking cessation should be emphasized to reduce ulcer risk.

Conclusion

Ulcer disease in excluded segments after RYGB, though uncommon, carries significant morbidity due to diagnostic and therapeutic challenges posed by altered anatomy and physiology. Comprehensive understanding of pathophysiology and risk factors is vital to improve patient outcomes through timely diagnosis and optimized treatment.

References

1. G. Peter et al. 2020 -- Review of Ulcer Disease in Excluded Segments Following Roux-en-Y Gastric Bypass