The laparoscopic one anastomosis gastric bypass is a variant of the Laparoscopic Roux en Y gastric bypass. It is also known as the mini gastric bypass (MGB) or omega loop gastric bypass. It is significantly increasing worldwide in terms of popularity because of it's excellent results. It has excellent short and long term weight loss.
The operation involves the formation of a long narrow gastric pouch (40ml size). The stomach pouch then is joined to the small bowel so that 1.5 to 2m of the small bowel is bypassed. As there is no second anastomosis there are fewer complications. At one year the average excess body weight loss is 75%.
As this operation has more "power" in terms of weight loss compared to the sleeve gastrectomy, it is a good choice for people with BMIs above 50.