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Conference report

Mini-Gastric Bypass (One-Anastomosis) Course

Mini-Gastric (One-Anastomosis) Bypass Course held Aug. 27, 2014 at the IFSO Congress, Montreal

This article was co-authored by Mervyn Deitel, MD, FASMBS (Toronto, Canada) and Kuldeepak S. Kular, MD (Bija, India)

Kuldeepak S. Kular

All the Course presenters had published recent series with the MGB operation (OAGB), and these articles can be accessed under their names via PubMed. These papers keep disclosing that MGB has excellent results. A syllabus with abstracts of these current papers was disseminated to the attendees.

Mervyn Deitel

Under the organization of Jean-Marc Chevalier, Pradeep Chowbey, Kudeepak S. Kular, Mervyn Deitel, and Wei-Jei Lee, a mini-gastric bypass (MGB/OAGB, omega-loop gastric bypass) course was held in Montreal at the IFSO Congress. 

Pradeep Chowbey

Besides the Faculty of 30 experts, there were 100 attendees, many of whom were already performing the MGB.  It is noteworthy that all those performing the MGB had previously performed other bariatric operations.

Jean-Marc Chevalier

Dr. Cesare Peraglie of Florida presented the tips and techniques, based on a 10-year personal series of 1,500 MGBs (see Figure1).  His patients had had no operative mortality, and the long-term outcome in terms of maintained excess weight loss (mean 79%) and resolution of co-morbidities was excellent.  His video showed the dissection commencing transversely just below the crow’s foot, then going proximally beside a bougie, to the left of the angle of His which resulted in no proximal leaks. His antecolic gastrojejunostomy, 180-200 cm distal to Treitz’ ligament, is constructed wide to avoid back-pressure.

Complications of the MGB were presented by David Hargroder of  Missouri, based on a personal series of 1,400 cases.  Gastroesophageal disease with the long gastric conduit was not a postoperative feature, and for the rare instance of inadequate or excess weight loss, the gastrojejunal anastomosis could be easily moved proximally or distally. 

Figure 1: MGB (one-anastomosis or omega-loop gastric bypass)

Kular presented prevention and treatment of marginal ulcer after MGB in a series of >1,000 patients. Salicylates and smoking were avoided postop, but in his practice in the Punjab (where a diet high in fruits and vegetables is consumed), whisky did not cause ulcer. Marginal ulcer after MGB is less that after RYGB.

Robert Rutledge

Hiatal hernias (HH) are generally not repaired during the MGB, as the gastrojejunal anastomosis usually reduces the cardia. The  MGB leads to >85% resolution of GERD.  If a HH is still present, Robert Rutledge recommended repair if necessary 12-18 months after the MGB.  However, when a HH contained adherent fundus, Peraglie stated that the fundus was reduced and the hernia repaired at the MGB operation.  Rutledge, the originator of the MGB in 1997, emphasized the eradication of H. pylori and the necessity for postoperative supplements, including iron, calcium – preferably dairy, multi-vits, yoghurt, fresh fruits and vegetables. Postprandial hypoglycemia was rare.  The MGB induces significant fatty food intolerance and mild steatorrhea in response to large fatty meals.

Internal hernias had not occurred in the experience of the attendees, but leak at the gastrojejunostomy or distal small bowel obstruction did occur rarely.Atul Peters presented excellent results with MGB in the super obese.  Jean-Marc Chevallier presented a study showing the excellent quality of life at 5 years after MGB.

The data from the MGB Consensus Conferences in Paris (the last being October 2013 and also reported in Bariatric News) was presented by Deitel.  The weight loss and durability of the MGB was superior to the other bariatric operations.

Mario Musella and Marco Milone of Italy presented resolution of type 2 diabetes, hypertension and other co-morbidities after MGB, finding superiority in their study compared to laparoscopic sleeve gastrectomy (LSG).  The excellent Italian multi-center outcome of 974 consecutive laparoscopic MGBs was presented by Maurizio De Luca.  

Wei-Jei Lee

The 10-year comparison of MGB and RYGB (and more recently the LSG), in terms of postoperative weight loss, complications, resolution of diabetes, elevation of GLP-1 and quality of life, was presented by Prof. Wei-Jei Lee of Taiwan; he found superiority with the MGB in each instance.  Better results were also found with the MGB in an audit comparing it with LSG and RYGB by G.S. Jammu of India. 

The technique of the Caballero OAGB since 2004 was presented by Prof. Manuel GarciaCaballero of Spain, who inserts antireflux stitches between the afferent limb and stomach. His results have also been superior to the other bariatric operations with respect to remission or cure of diabetes.  He tailors the OAGB in diabetes surgery and for BMI.  The similar Miguel A. Carbajo method was presented by Enrique Luque De Leon of Mexico.  The results of 12 years with 2,400 OAGBs found superior results over RYGB, LSG and gastric banding.  It is estimated that 15% of the MGB surgeons insert the antireflux sutures.

Deitel pointed out that there is no evidence for increased cancer after MGB. In the literature, more than 40 cases of carcinoma after RYGB were cited, in addition to a number of cases after LAGB, and two cases after the LSG.  After MGB, no cases of carcinoma in the gastric tube or esophagus have been reported. It is noted that following the thousands of vagotomy and pyloroplasty operations for peptic ulcer disease in the 1960–70s, in which some bile was always present in the lower stomach, no cases of carcinoma were reported. Furthermore, a warning is often given about carcinoma developing in the rat’s stomach when subjected to a bile preparation; however, Frantz showed that the neoplastic changes in the unique rodent stomach occur in the proximal two-thirds (which is squamous-cell), and not in the distal one-third (which is glandular like the human stomach). Long-term follow-up after Billroth II which permits bile in stomach has indeed found a decreased incidence of carcinoma, and these studies were performed before H. pylori was known or treated.  

Kular presented his comparison of MGB and LSG, in which the weight loss after MGB was greater and the complications less.  Drs. Jean Cady and Antoine Sopriani presented a large series of MGB as a rescue operation after gastric banding failure.  Techniques for conversion to MGB after failed band, LSG and other bariatric operations were presented by Jean-Marc Chevallier. He also presented a short video of the restoration of normal anatomy after MGB for very rare de-nutrition; reversal of MGB is an easy operation.  Robotics in MGB was presented by Arun Prasad of India, which showed the ease and accuracy of this method.

The technique of the Greco-Tacchino distal MGB with a larger proximal gastric conduit and a more distal gastroileostomy was presented and recently published as “Ileal Food Diversion” – which they compared to BPD.  However, their operation is easier and has had better results.  

The experts agreed that the MGB is a simple, rapid, safe operation, with excellent resolution of obesity-associated diseases, durable weight loss, a relatively short learning curve, is adjustable with BMI and, if ever necessary, easily reversible.  Because of interest in this Course and the free papers on MGB presented during the IFSO Congress, it has been decided to hold an MGB Course in Vienna at IFSO-2015 on Aug. 26.  A Bibliography of papers presented follows:


  1. Rutledge R. The mini-gastric bypass: experience with first 1,274 cases. Obes Surg 2001; 11:276-80.
  2. Garcia-Caballero M, Carbalo M. One anastomosis gastric bypass: a simple, safe and efficient procedure for treating morbid obesity. Nutr Hosp 2004;19:372-5.
  3. Rutledge R, Walsh W. Continued excellent results with the mini-gastric bypass: six- year study in 2,410 patients. Obes Surg 2005;15:1304-8.
  4. Carbajo M, Garcia-Caballero M, Toledano M, Osorio D, Garacia-Lanza C, Carmona JA. One-anastomosis gastric bypass by laparoscopy: results of the first 209 patients. Obes Surg 2005;15:398-404.
  5. Lee WJ, Yu PJ, Wang W, Chen TC, Wei PL, Huang MT. Laparoscopic Roux-en- Y versus mini-gastric bypass for the treatment of morbid obesity: a prospective randomized controlled clinical trial. Ann Surg 2005;242:20–8.
  6. Noun R, Riachi E, Zeidan S, Abboud B, Chalhoub V, Yazigi A. Mini-gastric bypass by mini-laparotomy: a cost-effective alternative in the laparoscopic era. Obes Surg 2007;17:1482-6.
  7. Peraglie C. Laparoscopic minigastric bypass (LMGB) in the super-super obese: outcomes in 16 patients. Obes Surg 2008;18:1126-9.
  8. Chevallier J-M, Chakhtoura G, Zinzindohoue F. Laparoscopic mini-gastric bypass. In: Deitel M, Gagner M, Dixon JB, Himpens J (eds). Handbook of Obesity Surgery. Toronto:F-D Communications. 2010:pp 78-84.
  9. Noun R, Skaff J, Riachi E, Daher R, Antoun NA, Nasr M. One thousand consecutive mini-gastric bypass: short and long-term outcome. Obes Surg 2012;22:697-703.
  10. Piazza L, Ferrara F, Leanza S, Coco D, Sarvà S, Bellia A, Di Stefano C, Basile F, Biondi A. Laparoscopic mini-gastric bypass: short-term single-institute experience. Updates Surg 2011;63:239-42.
  11. Lee WJ, Ser KH, Lee YC, Tsou JJ, Chen SC, Chen JC. Laparoscopic Roux-en-Y vs.  mini-gastric bypass for the treatment of morbid obesity: a 10-year experience.  Obes Surg 2012;22:1827-34.
  12. Garcia-Caballero M, Valle M, Martinez-Moreno JM, et al.  Resolution of diabetes  mellitus and metabolic syndrome in normal weight 24-29 BMI patients with one  anastomosis gastric bypass. Nutr Hosp 2012;27:623-31.
  13. Milone M, Di Minno MN, Leongito M, Maietta P, Bianco P, Taffuri C, Gaudioso D, Lupoli R, Savastano S, Milone F, Musella M. Bariatric surgery and  diabetes remission: sleeve gastrectomy or mini-gastric bypass? World J  Gastroenterol 2013;19:6590-7.
  14. Moszkowicz D, Rau C, Guennzi M, Zinzindohoue F, Berger A, Chevallier JM.  Laparoscopic omega-loop gastric bypass for the conversion of failed sleeve gastrectomy: early experience. J Vis Surg 2013;150:373-8.
  15. Musella M, Sousa A, Greco F, De Luca, Manno E, Di Stefano C, Milone M, Bonfanto R, Segato G, Antonino A, Piazzo L. The laparoscopic mini-gastric bypass: The Italian experience: outcomes from 974 consecutive cases in a multi-center  review. Surg Endosc 2014;28:156-63.
  16. Kular KS, Manchanda N, Rutledge R. A 6-year experience with 1,054 mini-gastric bypasses—First study from Indian subcontinent. Obes Surg 2014; DOI 10.1007/s11695-014-1220-3.
  17. Disse E, Pasquer A, Espalieu P, Poncet G, Gouillat C, Robert M. Greater weight loss with the omega loop bypass compared to Roux-en-Y gastric bypass: a  comparative study. Obes Surg 2014 Jan 19 [Epub].
  18. Coskin H, Hasbahceci M, Bozkurt S, et al. Effect of laparoscopic mini-gastric  bypass on diabetes in morbidly obese patients. Eur J Laparosc Surg 2014:1:40-4.
  19. Rutledge R. Hospitalization before and after mini-gastric bypass surgery. Int J Surg 2007;5:35-40.
  20. Lee WJ, Lee YC, Ser KH, Chen SC, Su YH. Revisional surgery for laparoscopic minigastric bypass. Surg Obes Relat Dis 2011;7:486-91.
  21. Weiner RA, Theodoridou S, Weiner S. Failure of laparoscopic sleeve gastrectomy – further procedure? Obes Facts 2011:Suppl 1:42-6.
  22. Moszkowicz D, Arienzo R, Khettab I, Rahmi G, Zinzindohoue F, Berger A, Chevallier JM. Sleeve gastrectomy severe complications: is it always a reasonable surgical option? Obes surg 2013;3:676-86.
  23. Christou NV, Look D, MacLean LD.  Weight gain after short- and long-limb gastric bypass in patients followed for longer than 10 years. Ann Surg 2006;244;:734-40.
  24. Higa K, Ho T, Tercero F, Yunus T, Boone KB. Laparoscopic Roux-en- Y gastric bypass: 10-year follow-up. Surg Obes Relat Dis 2011;7: 516–25.
  25. Rutledge R, Kular KS, Marchanda N, Bandari M, Goel R. A comparison of the outcomes of revision of the Roux-en-Y (RNY) and mini-gastric bypass (MGB); hard vs. easy. Eur J Endosc Laparosc Surg 2014;1:1-6.
  26. Frantz JD, Bretton G, Cartwright ME, et al. Proliferative lesions of the  non-glandular and glandular stomach of rats. In: Guides for Toxicologic Pathology STP/ARF/AFIP, Washington, DC, 1991.
  27. Kular KS, Machanda N, Rutledge R. Analysis of the five-year outcomes of sleeve gastrectomy and mini gastric bypass: a report from the Indian sub-continent. Obes Surg 2014;24:1724-8.
  28. Scozzari G, Trapani R, Toppino M, Morino M. Esophagogastric cancer after bariatric surgery: systematic review of the literature. Surg Obes Relat Dis 2013;9:133–42.
  29. Nau P, Rattner DW, Meireles O. Linitus plastica presenting two years after elective Roux-en-Y gastric bypass for treatment of morbid obesity: a case report and review of the literature. 2013;June 19. Epub.
  30. Scheepers AF, Schoon EJ, Nienhuijs SW. Esophageal cancer after sleeve gastrectomy. Surg Obes Relat Dis 2011;e11-2.
  31. Angrisani L, Santonicola A, Iovino P. Gastric cancer: a de novo diagnosis after laparoscopic sleeve gastrectomy. Surg Obes Relat Dis 2014;10:186-7.
  32. Lee WJ, Wang W, Lee YC, Huang MT, Ser KH, Chen JC. Laparoscopic mini-gastric bypass: experience with tailored bypass limb according to body weight. Obes Surg 2008;18:294-9.
  33. Chen MC, Lee YC, Lee WJ, Liu HL, Ser KH. Diet behavior and low hemoglobin level after laparoscopic mini-gastric bypass surgery. Hepatogastroenterology 2012;59:2530–32.
  34. Deitel M. Mini-gastric (one-anastomosis) bypass becoming a mainstream operation. Bariatric News, issue 18, Dec. 2013 – page 13.
  35. Lee YC, Lee WWJ, Liew PL. Predictors of remission of type 2 diabetes mellitus in obese patients after gastrointestinal surgery.  Obes Res Clin Pract   2013 Dec7 c0e431-500.
  36. Georgiadou D, Sergentans TN, Nixon A, et al.  Efficacy and safety of laparoscopic mini gastric bypass. A systematic review. Surg Obes Relat Dis 2014 Feb 15 [Epub ahead of print].
  37. Kim Z, Hur KY. Laparoscopic mini-gastric bypass for type 2 diabetes: the preliminary report. World J Surg. 2011;35:631–636.
  38. Prasad A. Robotic one anastomosis (omega loop/mini) gastric bypass for morbid obesity. Journal of Robotic Surgery. 2014; Aug 14.  DOI 10.1007/s11701-014-0480-1.
  39. Greco F, Tacchino R. Ileal food diversion: a simple, powerful and easily revisable and reversible single-anastomosis gastric bypass. Obes Surg 2014 Sep 19 [Epub].

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