The traditional duodenal switch (DS), like the gastric bypass (RYGB) and the ModDS, is both a malabsorptive and restrictive surgery.
Traditional duodenal switch: Is it right for me?
The traditional DS procedure was first done in 1986. In this procedure, over 90% of the small intestine was bypassed, which produced excellent weight loss results — but it came with a significant risk of long-term complications. Most of the studies showed that such risk to be over 30%. Because of this high complication rate, very few surgeons in the United States perform this surgery, and it now represents less than 5% of all weight loss surgeries done in the country today.