A duodenal switch is a restrictive and malabsorptive procedure. The restrictive component occurs when three quarters of the stomach is removed through a sleeve gastrectomy. The normal function of the stomach is maintained, however, its capacity is just markedly reduced.
Subsequently, the duodenum is cut in two positions, proximally and distally. The malabsorptive component is formed when the distal part of the duodenum is reconnected to the stomach forming a new pathway (the Roux limb). Food bypasses the majority of the duodenum which limits the amount of food that can be absorbed. Key enzymes from the pancreas can still enter the new and shorter small intestines and allow the natural breakdown of food. The full name for this method of bypass is a biliopancreatic diversion with sleeve gastrectomy.
