The measurement of gastric transmucosal potential difference through a gastroduodenoscope.
D004386:Duodenum / Q000502:physiology; D004566:Electrodes; D004594:Electrophysiology; D004724:Endoscopy; D005753:Gastric Mucosa / Q000502:physiology*; D005773:Gastroscopy; D006801:Humans; D008722:Methods