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Zollinger-Ellison syndrome — Clinical Guidelines

Overview

Zollinger-Ellison syndrome (ZES) is characterized by excessive gastric acid secretion due to gastrin-producing tumors (gastrinomas), leading to severe peptic ulcer disease and diarrhea. It can occur sporadically or in association with multiple endocrine neoplasia type 1 (MEN1). 1 2

Diagnosis

Key Diagnostic Criteria:

- Plasma gastrin levels >1000 pg/mL - Basal acid output >15 mEq/h (intact stomach) or >5 mEq/h (post-gastrectomy) - Elevated gastrin levels with pH <2

Recommended Tests:

- Imaging studies (CT, MRI, somatostatin receptor scintigraphy) to locate gastrinomas - Secretin stimulation test to confirm gastrinoma presence

Grading:

- Lesion localization via imaging is crucial for management planning 1 3

Management

First-Line Treatments:

- Proton Pump Inhibitors (PPIs): Omeprazole 80-100 mg/day or pantoprazole 40-160 mg/day

Adjunctive Treatments:

- Surgical Management: - Sporadic ZES: Routine surgery early, including intraoperative exploration and lymphadenectomy regardless of imaging findings 1 - MEN1/ZES: Surgery recommended only for lesions >2 cm; radical resection (e.g., pancreaticoduodenectomy) considered 1 - Conservative Excision: For isolated benign duodenal wall gastrinomas, conservative excision may be preferred over total gastrectomy 4

Special Populations

Elderly Patients:

- PPIs can be administered at high dosages without significant adverse effects 2

Comorbidities:

- Management strategies should consider coexisting conditions, emphasizing PPI efficacy and safety 2

Key Recommendations

Surgical intervention should be routinely considered early in sporadic ZES cases, including those with negative imaging findings, to manage gastrinomas effectively. (Evidence: Strong 1)

For MEN1-related ZES, surgical resection is indicated only for gastrinomas larger than 2 cm. (Evidence: Moderate 1)

Proton pump inhibitors should be initiated at high doses (e.g., omeprazole 80-100 mg/day or pantoprazole 40-160 mg/day) in elderly patients for effective control of gastric acid hypersecretion. (Evidence: Strong 2)

References

1 Shao QQ, Zhao BB, Dong LB, Cao HT, Wang WB. Surgical management of Zollinger-Ellison syndrome: Classical considerations and current controversies. World journal of gastroenterology 2019. link 2 Tomassetti P, Salomone T, Migliori M, Campana D, Corinaldesi R. Optimal treatment of Zollinger-Ellison syndrome and related conditions in elderly patients. Drugs & aging 2003. link 3 Bhagavan BS, Slavin RE, Goldberg J, Rao RN. Ectopic gastrinoma and Zollinger-Ellison syndrome. Human pathology 1986. link80130-7) 4 Kune GA, Judson R, Sinclair R. Zollinger-Ellison syndrome caused by a duodenal wall tumour. The Medical journal of Australia 1977. link

Zollinger-Ellison syndrome