Clinical trial Recruiting at 2 sites Interventional Ages 20 to 60

Comparing two surgical options for treating morbid obesity

Official title: Laparoscopic Single Anastomosis Sleeve Ileal Bypass Versus Laparoscopic Sleeve Gastrectomy for Morbid Obesity: A Randomized Trial

Run by Oslo University Hospital · NCT05611697 · Data updated 2026-11-12

This study is testing whether a new type of weight loss surgery called SASI works better than the traditional sleeve gastrectomy for people with severe obesity.

Quick facts

Study typeInterventional
Ages20 Years to 60 Years
SexAll
Enrollment220 (estimated)
SponsorOslo University Hospital
Academic / other
Locations2 sites (Tønsberg, Vestfold and 1 other locations)
StatusRecruiting
StartedFebruary 17, 2023
Main results expectedDecember 2028
Study endsDecember 2031
Registry record updatedMay 18, 2026
Trial IDNCT05611697 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates for this study are Norwegian-speaking adults aged 20-60 with morbid obesity and a BMI of 35 kg/m2 or higher, who have previously attempted weight loss.

Probably not a fit

Patients with a BMI of 55 kg/m2 or higher, a history of major abdominal surgery, or established gastroesophageal reflux disease 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 study compares the effectiveness of two bariatric surgical procedures: the single anastomosis sleeve ileal bypass (SASI) and sleeve gastrectomy. It aims to evaluate weight loss outcomes, gastroesophageal reflux, and the impact on obesity-related comorbidities in morbidly obese patients. The primary endpoint is the change in body mass index (BMI) over two years following the procedures. The SASI procedure is a newer approach that has been introduced in Norway, and this study seeks to determine its efficacy compared to the established sleeve gastrectomy.

Why it matters

Potential benefit: If successful, this study could provide insights into more effective surgical options for morbidly obese patients, potentially leading to better weight loss outcomes and improved health.

How similar studies have gone: While the SASI procedure is relatively novel, previous studies on similar bariatric procedures have shown promising results, indicating potential for success.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Morbid obesity at referral for bariatric surgery (i.e. a body-mass index \[BMI\] of ≥35 kg/m2 with obesity-related comorbid conditions or ≥40 kg/m2 with or without such comorbidities).
2. Age 20-60 years.
3. Previous failed attempts of weight loss.
4. Norwegian speaking patients.

Exclusion Criteria:

1. BMI ≥55 kg/m2.
2. A history of major abdominal or bariatric surgery (excluding appendectomy, cholecystectomy, and sectio).
3. Established disabling cardiopulmonary disease, ongoing treatment for cancer, long-term steroid use, and conditions believed to be associated with poor adherence after surgery.
4. Previous or current gastroesophageal reflux symptoms with daily use of antireflux medication. Patients are also excluded if preoperative manometry identifies a hiatal hernia (≥4cm in axial length) or if preoperative upper endoscopy identifies esophagitis grade C or D (LA classification), peptic stricture, Barrett's esophagus, or esophageal carcinoma.
5. Achalasia
6. Pregnancy.

Where it's running

  • The Morbid Obesity Center, Vestfold Hospital Trust
    Tønsberg, Vestfold, Norway
    Recruiting
  • Oslo University Hospital
    Oslo, Norway
    Recruiting

Study contacts

  • Principal investigator: Torgeir T Søvik, MD, PhD — Oslo University Hospital
  • Study coordinator: Helene M Haug, MD
  • Email: b31831@ous-hf.no
  • Phone: +47 22 11 80 80

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

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.