The Mini gastric bypass or Single Anastomosis Gastric bypass has been performed for about 20 years. It combines properties of both the Gastric sleeve and the Roux-en-Y gastric bypass. The upper part of your stomach is divided into a tube, similar to the top three quarters of a sleeve, and then joined to a loop of intestine.
Several studies have been published on the long term effects of the Mini Gastric bypass surgery. Two years after the surgery, weight loss is 75-85% of excess body weight; five years after the surgery, it is stable at 70-75%.
So, on average, a typical patient who is 50 kilograms overweight will lose between 35– 42.5 kilograms.
Using key-hole surgery, the top of your stomach is stapled to form a thin tube (50ml in size). A loop of your small intestine is then joined on to your new stomach pouch. This bypasses the first part of your intestine called the duodenum and approximately 150–200cm of your small bowel. The rest of your stomach and upper part of your small intestine remains in the body but is no longer used for food digestion.
You will stay in hospital 1- 2 nights and will usually return to work within two weeks. However, everyone is different.
- Mini or Single Anastomosis Gastric bypass surgery takes shorter operating time than the Roux-en-Y gastric bypass surgery
- Appears to be more effective for patients with a higher BMI, compared with the Roux-en-Y gastric bypass
- Type 2 Diabetes Mellitus: Comparable results to a Roux-en-Y gastric bypass.
- Less risk of internal hernias
- Lifelong usage of food supplements and vitamins is necessary for all patients
- Greater risk of malnutrition, when compared to a gastric sleeve or Roux-en-Y bypass
- Risk of anaemia (low haemoglobin), caused by low iron levels. Women of child-bearing age are most at risk
- Greater likelihood that patients will experience more bile reflux than after a Roux-en-Y gastric bypass