Mini Gastric Bypass

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What is mini gastric bypass?

The mini gastric bypass, also called the one anastomosis gastric bypass (OAGB), and the Omega loop gastric bypass, is a real alternative to the sleeve gastrectomy and Roux Y gastric bypass operations.

It was first described in 1997, and has become popular in Europe and Asia. It involves creating a sleeve-like stomach, and bypassing some of the bowel. But no stomach is discarded, and the bowel is connected as a loop, not a Y.

There is some medium term data coming through which suggests that the minigastric bypass is associated with less weight regain and reflux than the sleeve gastrectomy, and weight loss results more similar to the Roux Y gastric bypass.

Advantages of the Mini Gastric Bypass

  • Stomach is not removed permanently
  • potentially better hunger control and weight loss
  • Potentially safer than Roux Y gastric bypass

The risk of volvulus (twisting of the bowel) which can happen after Roux Y, does not seem to occur.


The join of the stomach to the bowel has the risk of bleeding, stricture or ulcers (each about 1% chance), like the Roux. There is a smaller chance of bleeding or stricture with the sleeve.

The anastomosis to the bowel increases the chance of dumping, similar to the Roux Y

There is still a chance of leak, like the sleeve and the Roux Y.

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