The Omega Loop gastric bypass is very similar to the standard Roux-en-Y gastric bypass.
It is not a new procedure, it has been around since in the late 1960s. Today, because it is slightly easier to perform laparoscopically than the standard Roux-en-Y gastric bypass, it has started to come back into fashion and is being promoted as a quicker and effective alternative to standard gastric bypass. The operation is popular in Europe and is gaining popularity in Australia, perhaps positioned as something slightly more effective than sleeve gastrectomy, but easier and not quire as effective as Roux-en-Y gastric bypass.
The main difference between the standard Roux-en-Y gastric bypass procedure and the Omega Loop gastric bypass can be seen by comparing the two diagrams below. In the case of the Omega Loop gastric bypass there is only one bowel join (anastomosis) whereas in the Roux-en-Y gastric bypass there are two joins– an upper and a lower. Because of this the Omega Loop gastric bypass can be done more quickly than the standard gastric bypass, and theoretically with fewer early complications.
In both operations there stomach is merely divided into a small upper portion, leaving the larger lower portion of the stomach with its storage capacity, untouched. This is the restrictive part of the procedure and means that only a small amount of food can be taken at any one time. Next, a loop of bowel is joined to the small upper part of the stomach. (The joining of bowel to bowel, or stomach to bowel is called an “anastamosis”). This means that food passes from the small stomach straight into the bowel therefore bypassing the storage capacity of the main stomach. Fats and sugars therefore bypass the stomach, duodenum and upper part of the small bowel where they are normally absorbed, instead passing downstream as waste. Fewer calories absorbed, means weight los
Very similar to operation to standard Roux-en-Y gastric bypass
Weight loss and health benefits resulting are essentially the same as for standard Roux-en-Y gastric bypass.
A more advanced procedure than sleeve gastrectomy
Quicker to perform laparoscopically than standard gastric bypass
May result in more reflux than standard gastric bypass
If reflux is problematic, may need to be converted to standard gastric bypass
The long term results of allowing bile into the stomach are unknown
Not as much data on the long term outcomes as for standard gastric bypass, sleeve gastrectomy and adjustable gastric banding