AN ELECTROMYOGRAPHIC STUDY ON THE CORRELATION BETWEEN GASTRIC AND DUODENAL MOTILITY

Abstract

The purpose of the present electromyographic study in dogs was to elucidate the correlation between gastric and duodenal motility.The action potentials at the pyloric portion of the stomach and the first portion of the duodenum were recorded on, 1) the non-treated control stomach, 2) the transected stomachs to induce hypermotility of the pyloric portion, 3) the vagotomized stomachs following transection to reduce the peristaltic activity, 4) and on the vagotomized stomachs (without transection).The results were as follows:1) The duodenum in 35.7 per cent of the cases showed action potentials in correlation with the gastric action potentials.2) The correlation was increased in the transected stomachs, and slightly decreased in the vagotomized stomachs.3) The gastric action potentials in the transected stomachs showed a tendency of correlation with more distal portion of the duodenum than those in the non-treated control stomachs. This finding was not altered significantly by vagotomy . When the duodenal electrode was placed more distally, the action potentials of the pyloric portion were less frequently correlated.4) The discharge interval was more prolonged and the propagation velocity was larger in the correlated spikes than those of the non-correlated spikes.5) The frequency of the antiperistalsis at the pyloric portion was more decreased in the correlated cases than in the non-correlated ones. Normoperistalsis at the pyloric portion showed a tendency of higher rate of correlation with the duodenum than those of antiperistalsis.6) The duodenal spikes in the correlated cases were more frequent than those in the non-correlated cases.