The mini gastric bypass, also known as the single anastomosis gastric bypass, is a relatively new procedure which combines some of the properties of a gastric sleeve and a Roux-en-Y gastric bypass. The upper part of the stomach is divided into a tube, similar to the top three quarters of a sleeve and then joined to a loop of intestine. It is an operation that combines restriction with some malabsorption and intended to result in good weight loss and improved quality of life.
What happens during laparoscopic mini/single anastomosis gastric bypass surgery?
The mini-gastric bypass procedure is performed using laparoscopic (keyhole) technique under general anaesthetic. Five small incisions (between five and twelve mm in length) are made for the insertion of keyhole surgical instruments. Using these instruments, the top of the stomach is stapled to form a thin tube (30ml to 50ml in size). The thin tube becomes the new, smaller stomach and is completely separate from the rest of the stomach. This stomach is then sewn to a loop of the small intestine, bypassing the first part of the intestine called the duodenum and approximately 150–200cm of the bowel. The rest of the stomach and upper part of the small intestine remains in the body but is no longer used for food digestion.
What is the recovery like?
Most people will stay in hospital for three or four days after surgery. After the procedure you will start on clear fluids only (water, black tea, broth, juices). These will need to be sipped slowly in small amounts. An x-ray study is performed after the operation to check the size of the stomach pouch and ensure there is no leak from the new connection. You will then remain on fluids such as water, clear soups, milk, diet cordials, or tea and coffee for the rest of your hospital stay. During the next four to six weeks, while your body heals, you will gradually increase the texture and volume of the food you take. Further information, including a dietary guidelines booklet, will be provided at your post-operative appointment with the dietitian.
Does this surgery always lead to major weight loss?
The mini-gastric bypass procedure helps you to lose weight in two ways:
It is important to remember that surgery is a tool for weight loss. It is vital that eating behaviours are modified to get the best result from the procedure.
What are the possible complications?
As with any surgical procedure, the mini-gastric bypass operation has a risk profile which is important to understand before proceeding.
Your surgical team will take all possible measures to reduce these risks, but if these complications occur, further treatment may be necessary.
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