Intestinal stenosis were produced in the lower small bowel by a longitudinal inverting plication of the intestinal wall by squeezing the bowel by balloon with continuous pressure, and by making a reversed segment of bowel. After these procedures, the action potentials were recorded from the stomach, duodenum, jejunum, ileum, terminal ileum, and ascending colon by extracellular electrodes fixed in their muscular layers. Results were as follows;
I. By the inverted plication, action potentials of oral ileum and duodenum showed higher activities four days after the operation which, however, became normal in every portion of the tracts seven days after the operation.
II. By squeezing of the bowel, increased electric activities in the portion proximal to the squeezed ileum was observed, but no remarkable changes were found in the duodenum or stomach. On the otherhand, decrease of discharge was found in the distal ileum.
III. In reversed anastomsis, it was revealed that the reversed segment when made not shorter than 10 cm in length was good for producing the intestinal stenosis. Increased potentials and irregular pattern were investigated in the oral part of intestine. In the reversed intestinal segment, high potentials were kept continuously and the peristaltic movements were predominantly isoperistaltic. No propagation of movements beyond the anastomotic line was observed.
