Which procedure involves a bypass of the duodenum?

The procedure that involves bypassing the duodenum is known as the Roux-en-Y gastric bypass (RYGB). In addition to RYGB, both the sleeve gastrectomy with duodenal switch (SADI-S) and biliopancreatic diversion with duodenal switch (BPD/DS) also involve bypassing the duodenum.

In RYGB, the surgical technique creates a small gastric pouch that significantly limits food intake and re-routes the small intestine to allow food to bypass the stomach and duodenum, leading to changes in digestion and absorption.

SADI-S is a variation of the sleeve gastrectomy that includes a duodenal switch component, promoting weight loss through both restrictive and malabsorptive mechanisms while bypassing the duodenum.

Similarly, BPD/DS consists of a sleeve gastrectomy and a bypass of the duodenum, aiming to reduce caloric absorption and promote significant weight loss.

So, since all of these procedures—RYGB, SADI-S, and BPD/DS—circumvent the duodenum, the selection encompasses all of the procedures as involving duodenal bypass. This is why the correct answer is that all of the options provided involve a