Decision analysis in evaluation of hypergastrinemia.

Hypergastrinemia and gastric acid hypersecretion are the principal laboratory features of Zollinger-Ellison syndrome. Decision and cost-effectiveness analyses were employed in the present study to compare and contrast the diagnostic strategies of initial gastric analysis followed by secretin infusion test versus secretin infusion test alone in the evaluation of hypergastrinemia in patients suspected of having gastrinoma. The results of this study showed that 59 percent of patients with elevated serum gastrin values were either hypochlorhydric or achlorhydric. Application of decision analysis to either diagnostic strategy demonstrated that gastric analysis followed by secretin infusion test, if indicated, was superior in expected value than secretin infusion test alone. Likewise, in this group of patients, performance of gastric analysis in the outpatient setting prior to secretin infusion testing was financially more advantageous than performance of secretin infusion testing alone. These results also demonstrate the importance of performing gastric analysis prior to anticipated hospitalization for evaluation of suspected gastrinoma. Such testing would obviate unnecessary hospitalization and medical costs.