A 52-year-old man with a 10-year history of GERD presents with persistent epigastric pain and heartburn despite 6 weeks of omeprazole 20 mg once daily. Upper endoscopy reveals a 2 cm ulcer in the gastric antrum with no signs of malignancy on biopsy. H. pylori serology is negative. What is the most appropriate next step in management?

Explanation

## Clinical Context This patient has a documented gastric ulcer that is refractory to standard-dose PPI therapy. The absence of H. pylori and malignancy rules out infectious and neoplastic causes, leaving inadequate acid suppression as the likely etiology. ## Rationale for Correct Answer **High-Yield:** Gastric ulcers require higher-dose PPI therapy compared to duodenal ulcers because gastric mucosa is more sensitive to acid injury and healing is slower. Standard-dose omeprazole (20 mg once daily) is insufficient for gastric ulcer healing. **Key Point:** The appropriate next step is to escalate PPI dosing to omeprazole 20 mg twice daily (or equivalent 40 mg once daily), which provides sustained gastric pH >4 for >18 hours daily—the target for gastric ulcer healing. Follow-up endoscopy at 4 weeks confirms healing and excludes malignancy (gastric ulcers carry a small risk of occult malignancy). ## Dose Escalation Algorithm ```mermaid flowchart TD A[Gastric ulcer on standard PPI]:::outcome --> B{H. pylori status?}:::decision B -->|Positive| C[Triple/quad therapy]:::action B -->|Negative| D{Healing at 4 weeks?}:::decision D -->|Yes| E[Continue PPI, taper if possible]:::action D -->|No| F[Escalate to high-dose PPI]:::action F --> G[Omeprazole 20 mg BD or 40 mg OD]:::action G --> H[Repeat endoscopy at 4 weeks]:::action H --> I{Ulcer healed?}:::decision I -->|Yes| J[Continue high-dose PPI for 4-8 weeks total]:::action I -->|No| K[Investigate for NSAID use, Zollinger-Ellison]:::urgent ``` ## Comparison: PPI Dosing for Ulcer Healing | Ulcer Type | Standard Dose | Refractory Dose | Healing Time | |---|---|---|---| | Duodenal | Omeprazole 20 mg OD | 40 mg OD | 2–4 weeks | | Gastric | Omeprazole 20 mg BD | 40 mg BD | 4–8 weeks | | NSAID-related | 20 mg BD | 40 mg OD–BD | 4–8 weeks | **Clinical Pearl:** Gastric ulcers heal more slowly than duodenal ulcers and require higher acid suppression. Repeat endoscopy is mandatory to confirm healing and exclude malignancy—this is a cardinal rule in gastric ulcer management. [cite:KD Tripathi 8e Ch 50]