Duodenal Switch Bypass Surgery is a longer, more complicated stomach bypass procedure. The bariatric surgeon partially resects the stomach leaving a smaller pouch (about 6 ounces capacity) which restricts food intake. The small intestine is then divided, with one end attached to the stomach pouch forming the "alimentary limb."
All food ingested into the stomach passes down this segment which completely bypasses the duodenum and the jejunum. Meanwhile, the digestive juices from the pancreas and stomach, regulated by the pyloric valve at the stomach exit, are channeled through the "biliopancreatic limb", which meets the "alimentary limb" thus forming a common limb at which point some calorie and nutritional absorption then occurs.
Results after a Duodenal Switch Bypass Surgery:
On average, patients who have malabsorptive bypass surgery, like duodenal switch bypass, typically lose two-thirds of their pre-operative excess weight within 2 years. Although a more drastic procedure than other bypass surgeries, biliopancreatic duodenal switch surgery is especially effective for weight reduction.