[Duodenogastric-reflux-favouring behaviour of the pylorus in patients with gastritis and duodenitis (author's transl)].

The pylorus was observed gastroscopically, biopsies of the gastral and duodenal mucosa were taken in 183 patients. If the mucosa did not show signs of inflammation, reflux-favouring behaviour of the pylorus (permanently being ajar or acting hyperkinetically) was rare. In patients with gastritis it was significantly more frequent. If the inflammation concerned the mucosa of the stomach as well as that of the duodenum the reflux-favouring behaviour of the pylorus was especially frequent.