Type of Surgery
Last updated: 11/24/2009
A gastric bypass is a surgical procedure that creates a very small stomach; the rest of the stomach is removed. The small intestine is attached to the new stomach, allowing the lower part of the stomach to be bypassed.
This animation describes the three main types of bariatric surgery. Topics covered include gastric bypass surgery, adjustable gastric banding, and sleeve gastrectomy.
Gastric bypass procedures (GBP) are any of a group of similar operations used to treat morbid obesityâ€”the severe accumulation of excess weight as fatty tissueâ€”and the health problems (comorbidities) it causes. Bariatric surgery is the term encompassing all of the surgical treatments for morbid obesity, not just gastric bypasses, which make up only one class of such operations.
A gastric bypass first divides the stomach into a small upper pouch and a much larger, lower "remnant" pouch and then re-arranges the small intestine to allow both pouches to stay connected to it. Surgeons have developed several different ways to reconnect the intestine, thus leading to several different GBP names. Any GBP leads to a marked reduction in the functional volume of the stomach, accompanied by an altered physiological and psychological response to food. The resulting weight loss, typically dramatic, markedly reduces comorbidities. The long-term mortality rate of gastric bypass patients has been shown to be reduced by up to 40%; however, complications are common and surgery-related death occurs within one month in 2% of patients.
Average excess weight loss at five years is 48-74 percent after gastric bypass and 50-60 percent after vertical banded gastroplasty -2004
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