43 patients with complicated gastric, duodenal or anastomotic ulcers resected according to Billroth II-Roux were controlled clinically, by endoscopy and X-ray. Little amounts of bile acid were found in only one case. Two groups with different pH-values were verified: 6 patients with pH from 1.2 to 2.2; three of them had recurrent ulcers. In the other group of the remaining 37 patients pH was higher than 5.5; there was only one recurrence in a patient with HPT. According to the Visick grading system results were good or excellent in 86%. The study shows that under conditions of no bile reflux and maintained vagal stimulation recurrence of ulcer is probable. In the acid ulcer type (Johnson II and III), duodenal ulcer and anastomotic ulcer supplementary vagotomy is recommendable.