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Review article: Strategies to determine whether hypergastrinaemia is due to Zollinger-Ellison syndrome rather than a more common benign cause Murugesan SV; Varro A; Pritchard DMAliment Pharmacol Ther 2009[May]; 29 (10): 1055-68BACKGROUND: As there is considerable overlap between the fasting serum gastrin concentrations found in Zollinger-Ellison syndrome and various common conditions such as Helicobacter pylori infection and acid suppressing medication use, establishing the cause of hypergastrinaemia in individual cases can sometimes be difficult. AIM: To review the causes of hypergastrinaemia and the role of additional non-invasive investigations in hypergastrinaemic patients. METHODS: Review of articles following a Pubmed search. RESULTS: As gastrinomas may cause serious complications and be potentially life threatening, investigation of hypergastrinaemic patients should particularly focus on confirming or refuting the diagnosis of Zollinger-Ellison syndrome. Establishing the cause of hypergastrinaemia may be difficult when there is only a mild-to-moderate elevation of fasting serum gastrin concentration and concurrent treatment with proton pump inhibitor drugs and the presence of H. pylori infection can both confuse the clinical picture. A variety of provocative tests are therefore useful for establishing whether a hypergastrinaemic patient has a gastrinoma and current evidence suggests that the secretin test should be used first line. CONCLUSIONS: We suggest an algorithm for the investigation of patients found to have an elevated fasting serum gastrin concentration and address the roles of gastrin stimulation tests in current clinical practice.|Algorithms[MESH]|Diagnosis, Differential[MESH]|Gastrinoma/*etiology[MESH]|Gastrins/*metabolism[MESH]|Gastrointestinal Agents/*adverse effects[MESH]|Helicobacter Infections/*diagnosis[MESH]|Helicobacter pylori/isolation & purification[MESH]|Humans[MESH]|Secretin/*metabolism[MESH]|Zollinger-Ellison Syndrome/*complications[MESH] |
