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 type | Interventional |
|---|---|
| Ages | 20 Years to 60 Years |
| Sex | All |
| Enrollment | 220 (estimated) |
| Sponsor | Oslo University Hospital Academic / other |
| Locations | 2 sites (Tønsberg, Vestfold and 1 other locations) |
| Status | Recruiting |
| Started | February 17, 2023 |
| Main results expected | December 2028 |
| Study ends | December 2031 |
| Registry record updated | May 18, 2026 |
| Trial ID | NCT05611697 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.
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Glycemic variability after SASI versus Roux-en-Y gastric bypass
This trial tests whether SASI or Roux-en-Y gastric bypass leads to different glucose fluctuations in adults with severe obesity using continuous glucose monitoring.
-
Postoperative nausea, vomiting and pain after bariatric surgery in Sweden
This study looks at how often people have nausea, vomiting, and pain after bariatric surgery in Sweden and whether anesthesia type or regional blocks affect those outcomes.
-
Low-impact laparoscopy for sleeve gastrectomy in adults with obesity
This will see if low-pressure, small-incision laparoscopy reduces post-surgery pain and improves breathing after sleeve gastrectomy in adults with obesity.
-
Tranexamic acid to reduce bleeding in sleeve gastrectomy and mini gastric bypass
This trial will test whether giving tranexamic acid before laparoscopic sleeve gastrectomy or mini gastric bypass reduces bleeding in adults with morbid obesity.
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Predicting Quality of Life After Bariatric Surgery from Pre-Surgery Profiles
This study tests whether pre-surgical patient traits can predict how quality of life changes after bariatric surgery for adults in the GEROM73 program.
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Endoscopic treatment for overweight and mild obesity using Orbera365
This study is testing whether the Orbera365 intragastric balloon can help people who are overweight or mildly obese lose weight over a year.
How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.