duodenal switch (DS), a surgical treatment for morbid obesity consisting of resection of the greater curvature of the stomach, leaving in place the pylorus and a little of the duodenum, which are anastomosed to the ileum. The rest of the duodenum and jejunum simply empty their secretions into the distal ileum through a new anastomosis. Also called biliopancreatic diversion, gastric reduction duodenal switch.
