(General Information)
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The Duodenal Switch ("DS") procedure restricts both food intake (initially) and the amount of calories and nutrients actually absorbed by the body.
A partial gastrectomy is performed where approximately 3/4 of the stomach is completely removed. The pyloric valve that regulates the release of contents from the stomach into the small intestine is left intact which means that there is no incidence of the "dumping syndrome" suffered by other bariatric patients. The intestines are then bypassed, leaving only a short section of intestine where most absorption takes place (the "common channel"). The effect of the malabsorption created by the bypass is that DS patients generally only absorb in the region of 30% of fats, 50% of proteins and 80% of carbohydrates ingested.
Following the DS procedure, the patient must be committed to their daily vitamin regimen, higher protein diet and clinical chemistry monitoring for life.
In the initial months after the DS, patients will have a high level of restriction and will feel full after ingesting very small amounts of food. Over a period of time, the stomach starts to stretch. In about 12 to 18 months, the stomach will have stretched to almost normal size allowing the DS patient to eat normally, whilst the bypassed section of intestine will continue to create malabsorption and assist in maintaining the weight loss.
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