One-Anastomosis (Mini) Gastric Bypass

What is One-Anastomosis Gastric Bypass?

One-Anastomosis Gastric Bypass is a form of bariatric surgery that modifies the digestive system to restrict food intake and reduce calorie absorption. During the procedure, the stomach is divided to create a small pouch, which is then directly connected to a loop of the small intestine. This "bypass" reduces the size of the stomach and reroutes food, limiting both the amount you can eat and the nutrients absorbed.

Unlike traditional Roux-en-Y Gastric Bypass, the OAGB involves just one connection (anastomosis) between the stomach and intestines, making the procedure less complex and quicker.

Benefits of One-Anastomosis Gastric Bypass

The Mini Gastric Bypass offers numerous benefits, making it an attractive option for patients:

• Significant Weight Loss: OAGB typically results in rapid and sustained weight loss. Most patients lose 60-80% of their excess body weight within 12-18 months after surgery.

• Simpler Procedure: With only one anastomosis, the surgery is quicker, with shorter operating times and fewer complications compared to other bypass procedures.

• Lower Risk of Nutritional Deficiencies: Since it bypasses a smaller portion of the intestines, OAGB may lead to fewer severe nutrient malabsorption issues compared to more extensive bypass procedures.

• Resolution of Obesity-Related Conditions: The surgery can greatly improve or resolve conditions such as type 2 diabetes, hypertension, sleep apnea, and joint pain.

• Improved Quality of Life: Patients report improvements in energy levels, mobility, and overall well-being.

When to Consider One-Anastomosis Gastric Bypass

The OAGB is suitable for individuals struggling with severe obesity and related health conditions who have been unable to achieve sustained weight loss through diet, exercise, or medications. You may consider this procedure if:

• You have a BMI of 40 or higher, or a BMI of 35+ with obesity-related health issues (such as diabetes or hypertension).

• You have tried other weight loss methods without success.

• You are committed to making significant lifestyle changes post-surgery, including a healthy diet and regular physical activity.

OAGB is also ideal for patients seeking a simpler surgical option with effective, long-term weight loss results.

What to Expect Before and After Surgery

Before Surgery

Prior to surgery, you will undergo a comprehensive evaluation, including medical tests, nutritional counselling, and consultations with your surgical team. You'll also be given a specific pre-surgery diet to follow to help reduce liver size and improve surgical outcomes.

During Surgery

The procedure is performed laparoscopically (minimally invasive), requiring small incisions. The surgery usually takes between 60-90 minutes, and most patients can expect a hospital stay of 1-3 days.

After Surgery

After OAGB, you’ll follow a carefully planned post-operative diet that transitions from liquids to soft foods, and eventually to solid foods. You will need to eat smaller, nutrient-dense meals to support your weight loss and avoid deficiencies. Regular follow-ups with your bariatric team are essential to monitor your progress and ensure long-term success.

Patients often start seeing weight loss within the first month, and major improvements in health conditions like diabetes and high blood pressure can occur within weeks.

Risks and Considerations

While the One-Anastomosis Gastric Bypass is generally safe and effective, like any surgery, it comes with potential risks and complications:

• Dumping Syndrome: Rapid movement of food into the small intestine can lead to nausea, diarrhoea, and sweating, especially after consuming high-sugar or fatty foods.

• Nutrient Deficiencies: Although less common than with other bypass procedures, patients can still experience deficiencies in vitamins and minerals like iron, calcium, and B12, requiring lifelong supplements.

• Reflux or Ulcers: Some patients may experience bile reflux or ulcers in the stomach or intestines.

• Risk of Hernia or Blood Clots: As with any major surgery, there is a small risk of developing hernias, blood clots, or infection.

• Weight Regain: While rare, some patients may regain weight if they don’t adhere to long-term dietary and lifestyle changes.

Your surgeon will discuss these risks in detail during your consultation and will monitor your health closely in the months and years following the procedure.

If you’re considering weight loss surgery and want to explore the benefits of One-Anastomosis Gastric Bypass, book a consultation with us today to discuss your options and find out if OAGB is the right solution for you.