Abstract
The distribution of nerve fibers and cell bodies reactive for the peptides enkephalin, neuropeptide Y, substance P, and vasoactive intestinal peptide were studied in biopsies of external muscle taken from the gastric body and antrum of 17 patients undergoing surgery for gastroesophageal reflux, and in regions of healthy stomach resected as part of gastric cancer operations. The results were correlated with preoperative measurements of liquid and solid emptying from the stomach in the patients with gastro-esophageal reflux. In three cases, no delay was detected in either liquid or solid emptying, and the distribution of peptide immunoreactive fibers in the external muscle was similar to that of healthy muscle. In 14 cases, the emptying of either liquids or solids or both was delayed, and in eight of these clearcut changes in the distribution of peptide-immunoreactive fibers occurred. In six cases, the number of enkephalin-immunoreactive fibers was fewer than normal in the biopsy from the gastric body (in one of these samples the number of substance P-immunoreactive fibers was also reduced). In another cae, the number of substance P-immunoreactive fibers in the antrum was reduced, and in another the number of vasoactive intestinal peptide and neuropeptide Y-immunoreactive fibers in the antral biopsy was reduced. It is concluded that in patients with gastroesophageal reflux who have delayed gastric emptying, a proportion demonstrate abnormalities of the peptide-immunoreactive fibers that innervate the gastric external muscle.
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