[Duodenitis and its correlation to diseases of the neighbouring organs and to duodeno-gastric reflux (author's transl)].

In 26,4% of patients (n = 201) with disturbances in the upper abdomen a serious proximal duodenitis was found. Older persons were more often concerned. A duodeno-gastric reflux was more frequent in presence of a serious duodenitis than in normal mucous membrane. Duodenitis was significantly more frequent in patients with atropic gastritis, ventricular ulcers and cholecystectomy. In the patients with reflux of bile the cases of antrum gastritis, with diseases of the biliary tract and nonoperated biliary tract diseases were significantly correlated with duodenitis; in atrophic gastritis as well as in gastric ulcers a duodeno-gastric reflux was found more than accidentally.