Gastric Dumping Syndrome - Diagnosis

Diagnosis

Physicians diagnose dumping syndrome primarily on the basis of symptoms in patients who have had gastric surgery. Tests may be needed to exclude other conditions that have similar symptoms. Two ways of determining if a patient has dumping syndrome include barium fluoroscopy and radionuclide scintigraphy. In the first procedure, a contrast of barium-labeled medium is ingested and x-ray images are taken; early dumping can be easily recognized by premature emptying of the contrast medium from the stomach.

The second method, scintigraphy (or radionuclide scanning), involves a similar procedure in which a labeled medium containing 99mTc (or other radionuclide) colloid or chelate is ingested. The 99mTc isotope decays in the stomach, and the gamma photons emitted are detected by a gamma camera; the radioactivity of the area of interest (the stomach) can then be plotted against time on a graph. Patients with dumping syndrome generally exhibit steep drops in their activity plots, corresponding to abnormally rapid emptying of gastric contents into the duodenum.