Gastric bypass is performed using key-hole surgery. The procedure is performed in patients who have had previous weight loss surgery – e.g. sleeve gastrectomy or gastric banding, and in patients as a primary (first-time) procedure.
A gastric bypass involves turning the stomach into a narrow tube and joining the small bowel to this portion of the stomach. Another join between two pieces of small bowel is performed further along the bowel to prevent a problem called bile reflux.
Gastric bypass is often performed in patients who have previously had weight loss surgery and may be the preferred operation in patients with poorly controlled reflux.
Patients lose approximately 70% of their excess weight. Complications include a leak at the staple line or anastomosis (where bowel is joined to each other), bleeding and internal hernia.