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Functional disorders of the upper gastrointestinal tract frequently require the placement of biopsy tubes into the duodenum. At present, monitoring of correct placement of these tubes usually entails the use of x-rays involving a single or repeated exposures. For accurate placement of duodenal tubes, the difference in TPD between the stomach and the duodenum has been employed as a criterion. Measurement of the TPD is technically simple, can be done at the bedside and obviates the need for using x-rays. Suitable hardware and the procedure are described in detail.

biomedizinische technik

Die transmurale Potentialdifferenz (tPD) des Gastrointestinaltraktes: Ihre diagnostische Nutzung zur röntgenbelastungsfreien Plazierung von Dünndarmsonden - The transmural Potential Difference (tPD) of the Gastrointestinaltract: Its Diagnostic Application to Position Control of Duodenal Biopsy Tubes with X-Ray Burden