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Gastric Bypass

The MGB (Single Anastamosis Gastric Bypass) was first used in America 16 years ago. It was deemed to be a safe, rapid and effective bariatric operation that yielded excellent results. As it has grown in popularity the worldwide number of procedures has increased significantly.

Important – this procedure should not be confused with the Roux-en-Y Gastric Bypass. The Clinical Team at NOSC have chosen not to become involved with Roux-en-Y due to the complexity of the procedure and the unpleasant, ongoing side effects. The MGB is a technically more simplified and less risky procedure that can easily be modified or reversed.


What is an MGB?

The purpose of the MGB (Single Anastamosis Gastric Bypass) is to create a smaller stomach (a mini stomach) that is long and narrow and that bypasses a section of the small intestine before any food is absorbed. The new mini stomach will hold only a small amount of food which leads to early satiety.

The MGB works by restricting the amount of food that can be eaten at any one time, and by altering the gut hormones involved in appetite control.


Is an MGB suitable for me?

The MGB could be your choice of treatment if your BMI is over 35 and you find it impossible to maintain any weight loss in the long term.

The MGB may be a suitable option if you find it hard under any circumstances to exercise discipline with your diet and you would like a long term surgical option, but don’t want an implanted device such as a gastric band.

The MGB is a long term procedure that can be reversed if necessary. It requires little in the way of follow up visits or further intervention so it is ideal for people with busy lifestyles and for those who are less mobile.


The procedure

The MGB is performed using laparoscopic (keyhole) surgery under general anaesthesia. The operation takes between 60 and 90 minutes and involves a 2 or 3 night stay in hospital.

In the first part of the operation the stomach is divided to create the new mini stomach. This is the restrictive part of the procedure meaning that only a small amount of food can be taken at any one time.

Next, a loop of intestine is joined to the lower part of the mini stomach. This join is called an anastamosis.

Food passes from the mini stomach into the small intestine where it meets digestive juices that have moved downwards from the main stomach. This means that around 2-4m of small intestine is bypassed. This is the hormone altering part of the procedure.


Aftercare

You will follow a liquid only diet for 4 weeks followed by 4 weeks of soft food. You will progress on to normal food in small portions. You are advised to take 2 weeks off work to ensure that you heal as quickly as possible.

You will have lots of support during this time and for the 12 months following your procedure. The NOSC medical team will guide you through your dietary requirements and our support team will be on hand to keep you motivated and to address any issues you may have.


The MGB (Single Anastamosis Gastric Bypass) was first used in America 16 years ago. It was deemed to be a safe, rapid and effective bariatric operation that yielded excellent results. As it has grown in popularity the worldwide number of procedures has increased significantly.

Important – this procedure should not be confused with the Roux-en-Y Gastric Bypass. The Clinical Team at NOSC have chosen not to become involved with Roux-en-Y due to the complexity of the procedure and the unpleasant, ongoing side effects. The MGB is a technically more simplified and less risky procedure that can easily be modified or reversed.

What is a gastric bypass

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