A comparative study of different methods of the assessment of a complete vagotomy (after Grassi--in 50 patients; after Uln--in 35 patients; the method of ultragastric pH-metry after stimulation by insulin of the gastric secretion--in 15 patients; the method of electrogastromyography after electrostimulation of the vagus nerve--in 5 patients) has shown that the method of electrogastromyography after the electrostimulation of the vagus nerves is the most perspective.