ArticleObesity surgery2015
One thousand single anastomosis (omega loop) gastric bypasses to treat morbid obesity in a 7-year period: outcomes show few complications and good efficacy.
Article in Obesity surgery, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to 2 registered trials, which are not on this map. Cited by 143 papers, 18 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
The Evidence of One-anastomosis Gastric Bypass/Mini-Gastric Bypass Versus Roux-en Y Gastric Bypass in Metabolic Surgery - a Prospective Randomized Controlled Trial
Comparison of 2 Suture Materials for Closure of Ventral Defect at the Gastrojejunostomy in One-Anastomosis-Gastric Bypass / Mini-Gastric Bypass (OAGB / MGB): a Randomized Short Term Study With Monocrylic Spiral Knotless Tissue Control Device vs. Traditional Polyglactin Multifilament Suture
Who cites it
143 citing papers in PubMed, 18 syntheses or guidelines pooled it, 277 citations in OpenAlex.
- Long-Term Outcomes of One Anastomosis Gastric Bypass: A Systematic Review and Meta-Analysis of 5-Year and Beyond.Obesity surgery · 2026Pooled it
- Primary and Revisional One Anastomosis Gastric Bypass: A Systematic Review and GRADE-Based IFSO Position Statement.Obesity surgery · 2026Pooled it
- Mapping the Landscape of Marginal Ulcers After One Anastomosis Gastric Bypass: Incidence, Regional Trends, and Treatment Insights from a Systematic Review and Meta-analysis.Obesity surgery · 2025Pooled it
- One Anastomosis Gastric Bypass Versus Roux‑en‑Y Gastric Bypass for Obesity: An Updated Meta‑analysis and Systematic Review of Randomized Controlled Trials.Obesity surgery · 2025Pooled it
- Outcomes of One-Anastomosis Gastric Bypass Conversion to Roux-en-Y Gastric Bypass for Severe Obesity: A Systematic Review and Meta-analysis.Obesity surgery · 2024Pooled it
- Does One-Anastomosis Gastric Bypass Expose Patients to Gastroesophageal Reflux: a Systematic Review and Meta-analysis.Obesity surgery · 2023Pooled it
- Marginal Ulcers Following One-Anastomosis Gastric Bypass: a Systematic Review and Meta-analysis.Obesity surgery · 2023Pooled it
- One Anastomosis Gastric Bypass (OAGB) with a 150-cm Biliopancreatic Limb (BPL) Versus a 200-cm BPL, a Systematic Review and Meta-analysis.Obesity surgery · 2023Pooled it
- Surgical Management of Gastro-oesophageal Reflux Disease After One Anastomosis Gastric Bypass - a Systematic Review.Obesity surgery · 2022Pooled it
- What Is the Efficacy of Short Length of Biliopancreatic Limb in One-Anastomosis Gastric Bypass? A Systematic Review and Meta-analysis of Short-Term Results.Obesity surgery · 2022Pooled it
- Effect of Biliopancreatic Limb Length on Weight Loss, Postoperative Complications, and Remission of Comorbidities in One Anastomosis Gastric Bypass: a Systematic Review and Meta-analysis.Obesity surgery · 2022Pooled it
- Indications, Operative Techniques, and Outcomes for Revisional Operation Following Mini-Gastric Bypass-One Anastomosis Gastric Bypass: a Systematic Review.Obesity surgery · 2020Pooled it
- Clinical Outcomes of One Anastomosis Gastric Bypass Versus Sleeve Gastrectomy for Morbid Obesity.Obesity surgery · 2020Pooled it
- One Anastomosis Gastric Bypass Versus Roux-en-Y Gastric Bypass for Morbid Obesity: an Updated Meta-Analysis.Obesity surgery · 2019Pooled it
- One Anastomosis (Mini) Gastric Bypass Is Now an Established Bariatric Procedure: a Systematic Review of 12,807 Patients.Obesity surgery · 2018Pooled it
- [Evidence of the Mini-/One-anastomosis-gastric-Bypass for being a standard procedure in obesity and metabolic surgery].Der Chirurg; Zeitschrift fur alle Gebiete der operativen Medizen · 2018Pooled it
- Pooled it
- One-Anastomosis Gastric Bypass Versus Sleeve Gastrectomy for Morbid Obesity: a Systematic Review and Meta-analysis.Obesity surgery · 2017Pooled it
- Effect of tailoring biliopancreatic limb length based on total small bowel length versus standard limb length in one anastomosis gastric bypass: 1-year outcomes of the TAILOR randomized clinical superiority trial.The British journal of surgery · 2024Trial
- The Surgical Technique of Primary Modified Fundoplication Using the Excluded Stomach with Simultaneous Gastric Bypass.Obesity surgery · 2023Trial
83 more citing papers are in PubMed but not listed here.
Corrections and comments
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Authors and funding
8 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundA short-term randomized controlled trial shows that the one anastomosis gastric bypass (OAGB) is a safe and effective alternative to the Roux-en-Y gastric bypass (RYGB).
objectiveThe aim of this study is to evaluate the OAGB at our University Hospital between 2006 and 2013. PATIENTS: One thousand patients have undergone an OAGB. Data were collected on all consecutive patients. The mean follow-up period was 31 months (SD, 26.3; range, 12-82.9), and complete follow-up was available in 126 of 175 patients (72 %) at 5 years after surgery.
resultsMortality rate was 0.2 %. Overall morbidity was 5.5 %; 34 required reoperations: i.e., 6 leaks, 5 obstructions, 5 incisional hernias, 7 biliary refluxes, 2 perforated ulcers, 2 bleeds, 2 abscesses, and 1 anastomotic stricture. Four patients were reoperated for weight regain. Overall rate of marginal ulcers was 2 % (n = 20), all in heavy smokers. Conversion from an OAGB to a RYGB was required in nine cases (0.9 %): seven for intractable biliary reflux, two for a marginal ulcer. At 5 years, percent excess body mass index loss was 71.6 ± 27 %. One hundred patients with type-2 diabetes, with a mean preoperative HbA1C of 7.7 ± 1.9 %, were followed for >2 years; the total resolution rate was 85.7 %.
conclusionThis study confirms that the OAGB is an effective procedure for morbid obesity with comparable outcomes to RYGB; in addition, it seems to be safer with lower morbidity. Its technical simplicity represents a real advantage and makes it an option that should be considered by all bariatric surgeons.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.