Clinical trial Recruiting at 1 site Interventional Ages 18 to 60

Comparing two types of gastric bypass for obesity treatment

Official title: A Multicentre Randomized Controlled Trial Comparing Outcome of Laparoscopic One-anastomosis Gastric Bypass and Laparoscopic Long Biliopancreatic Limb Roux Gastric Bypass for Treatment of Morbid Obesity.

Run by Tartu University Hospital · NCT04812132 · Data updated 2026-11-12

This study is testing which type of gastric bypass surgery, one-anastomosis or long biliary limb Roux, works better for people with obesity to help them lose weight and improve their health over time.

Quick facts

Study typeInterventional
Ages18 Years to 60 Years
SexAll
Enrollment500 (estimated)
SponsorTartu University Hospital
Academic / other
Locations1 site (Tartu)
StatusRecruiting
StartedJanuary 1, 2021
Main results expectedDecember 31, 2031
Study endsDecember 31, 2036
Registry record updatedMarch 23, 2021
Trial IDNCT04812132 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates for this study are adults aged 18-60 with a BMI over 35 and obesity-related diseases or a BMI over 40.

Probably not a fit

Patients under 18 or over 60 years old, those with prior bariatric surgery, or those with active gastrointestinal or psychiatric conditions may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial is a prospective multicenter randomized controlled trial designed to compare the outcomes of one-anastomosis gastric bypass (OAGB) with long biliary limb Roux gastric bypass in patients suffering from obesity. The study aims to enroll up to 500 patients across three clinics in Estonia and will evaluate various outcomes including excess weight loss percentage, effects on type 2 diabetes, hypertension, hyperlipidemia, and obstructive sleep apnea. Additionally, it will assess nutritional deficiencies, reflux disease occurrence, and quality of life impacts over a follow-up period of 1, 5, and 10 years post-surgery.

Why it matters

Potential benefit: If successful, this study could provide insights into which surgical approach offers better outcomes for patients with obesity and related health conditions.

How similar studies have gone: While many studies have compared OAGB to standard Roux gastric bypass, this study is novel as it specifically compares OAGB to long biliary limb gastric bypass.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* BMI over 35 and obesity related disease
* BMI over 40
* age between 18-60 years
* agrees to participate in the study

Exclusion Criteria:

* age under 18 years or over 60 years
* abundant adhesions discovered during the surgery
* active upper gastrointestinal ulcer disease
* prior bariatric surgery
* active symptomatic reflux disease
* active psychiatric disease (eg psychosis)

Where it's running

  • Tartu University Hospital
    Tartu, Estonia
    Recruiting

Similar studies

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.