[Canine intestinal myoelectric activity after total gastrectomy with jejunal interposition]

Changes of intestinal myoelectric activities after total gastrectomy with jejunal interposition were studied in three conscious dogs. Under general anesthesia a total gastrectomy was performed and intestinal continuity was reestablished by a 15 cm jejunal segment interposed between the esophagus and the duodenum. Two electrodes were sown each to the serosal surface of the interposed segment of the jejunum, duodenum, and distal potion of the jejunum, respectively. After recovery from the surgery, the myoelectric activities were recorded for 8 to 12 hours during fasting and after feeding a 200 ml liquid meal. In each segment, total gastrectomy did not alter the initiation of the migrating myoelectric complex (MMC) during fasting. Total gastrectomy also changed neither the postprandial inhibition of the enteric MMC nor the induction of the fed myoelectric pattern after feeding. The way of MMC propagation along the small intestine, however, showed various patterns. Each of three segments generated its own MMCs. Some complexes migrated to the next segment or had an effect on initiating new MMCs of the next segment. Although MMCs occurring in the segment of the interposed jejunum hardly migrated to the adjacent duodenum, some jumped to the distal jejunum. These results suggest that there are no coordinated activities between the interposed jejunum and the duodenum after total gastrectomy with jejunal interposition.