Duodenal Switch Surgery

The duodenal switch surgery is a complex and invasive weight-loss procedure that combines gastrectomy – removal of part of the stomach with an intestinal bypass.


The primary goal of this procedure is to restrict the capacity of the stomach to hold food and the nutrition the small intestine can absorb from the food. For this reason, it is also known as the ‘malabsorptive’ procedure. 

Duodenal Switch Surgery is of two types:

  • Biliopancreatic Diversion
  • Loop Duodenal Switch

Who Needs Duodenal Switch Surgery?

Duodenal Switch surgery is recommended for patients with more than 50 and above BMI. This is a severe form of obesity and can cause various metabolic disorders and chronic conditions and compromise the quality of life.

How Is Duodenal Switch Surgery Done?

Duodenal switch surgery can be done either as an open surgery or as a laparoscopic procedure. This two step-surgery begins with a Sleeve Gastrectomy where 65% of the stomach is removed. The surgeon then creates an intestinal bypass which is performed on the same day or after a few days.

The two methods – Biliopancreatic Diversion and the more advanced Loop Duodenal switch begin by dividing the small intestine on the top near the duodenum. Then the lower section of the small bowel is attached to the top, and the duodenum is ‘’switched’’ with the lower end of the small intestine.

While Biliopancreatic Diversion bypasses the small intestine by 80%, the loop version bypasses only about 60%. The latter is simpler with one division and reconnection.


It may take up to a year to achieve the desired weight loss.

The surgery is safe but may carry some complications like infection in the wounds, and excessive bleeding, which is common with other procedures.

The patient may have to spend up to a week after the Duodenal Switch in the hospital.

Patients may experience malnutrition after undergoing this procedure. Regular intake of vitamin supplements will help.

The patient will be advised to take only a liquid diet for the first week, after which they can slowly consume pureed food.

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