RESUMO
The joint work of doctors and mathematicians is based upon their 20-years experience with performing vagotomy in the clinic. Prognosis of recurrence of ulcer disease was elaborated on materials of 141 operations of isolated selective proximal vagotomy for chronic duodenal ulcer. The dispensary principle of managing the patients after operation allowed obtaining objective data both in the nearest and remote (over 10 years) periods. A group of 20 patients with recurrent ulcers and 13 patients with hypersecretion gastroduodenitis was considered to have unfavorable postoperative status. The prognosis developed may be used to make the indications to isolated selective proximal vagotomy more exact. The prognosis was correct in 80% of the observations.