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Selective venous sampling for gastrin to localize gastrinomas. A prospective assessment
Annals of Internal Medicine
|December 1, 1986
Summary
Selective venous sampling for gastrin is less useful for localizing gastrinomas in Zollinger-Ellison syndrome than previously thought. Imaging studies offer higher accuracy and should be prioritized over routine gastrin sampling.
Area of Science:
- Endocrinology
- Surgical Oncology
- Diagnostic Imaging
Background:
- Zollinger-Ellison syndrome is characterized by gastrin-producing tumors (gastrinomas).
- Accurate localization of gastrinomas is crucial for effective surgical management.
- Selective venous sampling for gastrin has been proposed as a method for tumor localization.
Purpose of the Study:
- To prospectively evaluate the utility of selective venous sampling for gastrin in localizing gastrinomas.
- To compare the diagnostic performance of gastrin sampling with imaging studies and surgical findings.
- To determine the clinical value of routine preoperative gastrin sampling.
Main Methods:
- Prospective evaluation of 27 patients with Zollinger-Ellison syndrome.
- Selective venous sampling for gastrin to detect gastrin gradients.
- Comparison of gastrin sampling results with imaging studies (e.g., CT, MRI) and surgical outcomes.
- Analysis of sensitivity, specificity, and predictive values of each diagnostic method.
Main Results:
- A significant gastrin gradient was observed in 20 out of 27 patients.
- Gastrinoma was surgically confirmed in 15 patients.
- Imaging studies correctly identified the tumor in 12 of 15 patients with confirmed gastrinoma.
- Selective venous sampling showed equal sensitivity to imaging but lower positive and negative predictive values and specificity.
- 8 patients without surgically found gastrinoma had a significant gastrin gradient, and none had positive imaging.
Conclusions:
- Selective venous sampling for gastrin has limited utility in localizing gastrinomas.
- Imaging studies demonstrate superior positive and negative predictive values and specificity compared to gastrin sampling.
- Routine preoperative selective venous sampling for gastrin is not recommended for patients with Zollinger-Ellison syndrome.
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