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Mini Gastric Bypass (MGB / OAGB)

Simplified bariatric bypass technique performed with a single omega-loop gastrojejunal anastomosis.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Genel Cerrahi department. Book Appointment →

What is Mini Gastric Bypass (MGB / OAGB)?

Mini gastric bypass (MGB) or One Anastomosis Gastric Bypass (OAGB) is a bariatric surgical technique developed as a simple alternative to the traditional Roux-en-Y gastric bypass. It was introduced by Rutledge in 2001 and its global popularity has grown markedly in recent years.

Technically, a long, narrow gastric tube is created and a loop (omega) gastrojejunostomy is fashioned approximately 150-200 cm distal to the ligament of Treitz. Because only one anastomosis is performed, the operative time is shorter and the technique is simpler than Roux-en-Y.

It provides effective weight loss and type 2 diabetes remission. Potential advantages include shorter operative time, fewer anastomotic complications, and easy revisability. Disadvantages include the risk of biliary reflux, marginal ulcer, and long-term nutritional deficiencies.

Symptoms

Morbid obesity (BMI ≥40)
BMI 35-40 with comorbidities
Type 2 diabetes mellitus
Sleep apnea and metabolic syndrome
Dyslipidemia and hypertension
Inadequate weight loss after sleeve gastrectomy
Hepatic steatosis (NASH)

Risk Factors

BMI >50 (super-obesity — mini bypass especially advantageous)
Insulin resistance and type 2 diabetes
Failed prior restrictive procedure
Need for a technically straightforward operation
Absence of GERD (because of biliary reflux risk)
Elderly patient unable to tolerate prolonged surgery
Setting in which long-term nutritional follow-up is feasible

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Failure of medical therapy for morbid obesity
  • Uncontrolled diabetes and metabolic syndrome
  • Quality of life impaired by obesity
  • Progression of obesity-related comorbidities
  • Persistent sleep apnea despite CPAP
  • Failure of previous bariatric surgery

Treatment Methods

01
Preoperative multidisciplinary evaluation (psychiatry, dietitian, endocrinology)
02
Laparoscopic creation of a long, narrow gastric tube
03
Identification of small bowel 150-200 cm distal to ligament of Treitz
04
Single omega-loop gastrojejunostomy
05
Postoperative liquid → puree → soft → normal diet progression
06
Multivitamin, B12, iron, calcium, and vitamin D replacement
07
Regular bariatric clinic follow-up and laboratory monitoring

Which Department to Visit?

You can visit our Genel Cerrahi department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.