Gastric bypass is one of the most established forms of weight loss surgery, making up around 30 to 40% of bariatric procedures performed in Australia each year. It works by creating a smaller stomach pouch and rerouting part of the small bowel, so you feel full sooner and absorb fewer calories from food.
There are two main ways we perform gastric bypass at Perth Weight Loss & Surgery: the Roux-en-Y Gastric Bypass and the One Anastomosis Gastric Bypass (also known as the Mini Gastric Bypass or Omega Loop). Both are proven, effective procedures. The right one for you depends on your health history, your goals, and what Dr Siva Gounder recommends after your consultation.
The traditional gastric bypass is still considered the gold standard by many surgeons worldwide. A small pouch is created at the top of the stomach, and the small bowel is divided and rejoined in a Y-shaped configuration, with two new connections. This design has over 40 years of data behind it.
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A newer, simplified version of the bypass. A longer, narrower pouch is created, and the small bowel is joined to it with just one new connection, rather than two.
It’s a shorter operation with a similar safety profile and has become increasingly common in Australia over the past decade.
| Traditional Bypass (Roux-en-Y) | Anastomosis Bypass (OAGB / Mini) | |
|---|---|---|
| Also known as | RYGB, traditional bypass | OAGB, Mini Gastric Bypass, Omega Loop |
| Number of bowel connections | Two | One |
| Typical operating time | 1 to 2 hours | Slightly shorter, due to one connection instead of two |
| Effect on reflux (GORD) | Excellent (Diverts both acid and bile) | Poor (High risk of chronic bile reflux) |
| Surgical Complexity | Higher (Requires two connections) | Lower (Requires one connection) |
| Primary Suitability | Patients with pre-existing GERD or severe heartburn | Patients wanting shorter surgical times without pre-existing reflux |
| Nutritional follow-up | Lifelong vitamin and mineral supplementation required | Lifelong vitamin and mineral supplementation required, with close monitoring |
| Dr Siva Gounder's Recommendation | This is Dr Siva's recommended bypass for patients, which will benefit the patient by having a better quality of life after surgery. | This surgery is also performed by Dr Siva on specific cases that need this. He won't recommend this option as the first choice. The patient will have follow-up appointments to track any consequences related to reflux. |
Both procedures are done laparoscopically (keyhole surgery), through several small cuts in the abdomen. Dr Gounder uses a telescope and fine instruments to create a tunnel behind the stomach, then uses a stapling device to form the smaller pouch. The small bowel is then joined to this new pouch, either in one connection (OAGB) or two (RYGB).
Most patients are in the hospital for around 2 nights. As with any surgery, there are risks, including bleeding, bowel obstruction, or leakage from the staple line, occurring in around 1% of cases.
Neither option is universally “better”. Dr Gounder will talk you through which approach suits your body, your medical history, and your goals, including whether you have existing reflux, your BMI, and any previous abdominal surgery. This is why a consultation, rather than a website, is the right place to make this decision.
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Below 18.5 - Underweight
18.5-24.9 - Normal
25.0-29.9 - Overweight
30.0 and Above - Obese
AT THIS STAGE YOU DO NOT QUALIFY FOR WEIGHT LOSS SURGERY, PLEASE
CONTACT US IF YOU HAVE FURTHER QUESTIONS.
