Severe gastric mucosal changes following vagotomy with duodenogastric reflux.

We conducted an experimental study of the morphological changes in gastric mucosa following vagotomy, in particular of the chronic effects of duodenogastric reflux. Male Wistar rats were divided into four groups: sham operation, duodenogastric reflux (DGR), truncal vagotomy with duodenogastric reflux (TV + DGR), and truncal vagotomy with bypass (TV + bypass). The last operation was performed to observe the effects of vagotomy without reflux. The duodenogastric reflux procedure was established by cutting the duodenum just distal to the orifice of bile and pancreatic ducts following gastrojejunostomy. After 12 and 30 weeks, animals were killed for morphological studies of gastric mucosa. The TV + DGR group showed formation of multiple elevated lesions macroscopically, and microscopically showed marked atrophy of gastric glands and proliferation of cystically dilated adenomatous lesions, which were regarded as precancerous or paracancerous lesions. The DGR group showed chronic gastric ulcer and hyperplasia of the gastric glands. However, the TV + bypass group showed no remarkable changes in the gastric mucosa. These results indicate that chronic effects of duodenogastric reflux following vagotomy induce severe inflammatory changes as well as structural alteration of the gastric mucosa. Therefore, a regular follow-up observation is necessary after vagotomy when combined with a drainage procedure because the latter could promote duodenogastric reflux and produces pathological changes to the stomach.