From July, 1964, to July, 1968, bilateral selective vagotomy and pyloroplasty were performed in 135 patients for duodenal ulcer, without postoperative mortality. Two unrelated deaths occurred during the period of the survey and 2 other patients were lost to follow-up. The remaining 131 patients were followed up for a minimum of 5 years and a maximum of 9 years.The most frequent symptoms were epigastric fullness, early dumping and mild diarrhoea. Only I case of moderate diarrhoea was observed, and none of severe diarrhoea. Food vomiting, bile vomiting and hypoglycaemia-like attacks were uncommon. Recurrent duodenal ulcer was proved in 4.6 per cent and highly suspected in I.5 per cent. Gastric ulcer was proved in * Valladolid, Spain.