[Measurement of the transmucosal biopotential differential via a fiber endoscope as a means of diagnosing the spread of malignant stomach neoplasms into the serous membrane].

A new time-saving procedure of preoperative diagnosis of involvement of serosa and adjacent organs in gastric cancer is discussed. It is based on the comparison of electric potentials across tumor (A) and normal gastric mucosa (B) measured by means of fibroendoscope. Coefficient K which is an A/B ratio was obtained. Statistically significant differences in coefficient K were established in 86 cases with and without involvement of serosa. Difference of electric potentials across gastric mucosa was measured by a newly-developed device which includes platinum electrodes. The null electrode was implanted subcutaneously, the active one was inserted into the stomach.