A consecutive series of 78 males with uncomplicated duodenal ulcer was prospectively randomised into one group treated with proximal gastric vagotomy (PGV) and another group treated with proximal gastric vagotomy with pyloroplasty (PGVP). Fortyseven patients had more than one year’s follow-up. The main findings were a significantly increased incidence of dumping in the patients who underwent PGVP as compared to those treated with PGV, and an extremely low incidence of diarrhoea in both groups.