Clinical trial Recruiting at 2 sites Observational Ages 18 to 99

Evaluating body fat changes and sleep apnea resolution after bariatric surgery

Official title: Changes in Body Fat and Morphologic Characteristics Associated With Obstructive Sleep Apnea (OSA) Resolution After Bariatric Surgery

Run by Centre Hospitalier Universitaire Saint Pierre · NCT05315752 · Data updated 2026-11-12

This study is testing if losing body fat after bariatric surgery helps people with severe obesity and sleep apnea get better and possibly stop needing their CPAP machines.

Quick facts

Study typeObservational
Ages18 Years to 99 Years
SexAll
Enrollment60 (estimated)
SponsorCentre Hospitalier Universitaire Saint Pierre
Academic / other
Locations2 sites (Brussels and 1 other locations)
StatusRecruiting
StartedApril 22, 2022
Main results expectedDecember 31, 2026
Study endsDecember 31, 2026
Registry record updatedFebruary 13, 2024
Trial IDNCT05315752 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are individuals with severe obesity (BMI≥35-40) or morbid obesity (BMI≥40) who have been diagnosed with obstructive sleep apnea and require CPAP treatment.

Probably not a fit

Patients with cognitive impairments or language barriers that prevent informed consent 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 observational study aims to assess the relationship between biometric changes and the resolution of obstructive sleep apnea (OSA) in patients undergoing bariatric surgery. Candidates for the study are individuals with severe obesity and diagnosed OSA who are currently using Continuous Positive Air Pressure (CPAP) therapy. The study will follow participants for 2, 6, and 12 months post-surgery to evaluate changes in neck circumference, waist/hip ratio, and body composition, comparing these metrics to changes in body mass index (BMI). The goal is to determine if these biometric changes correlate more strongly with OSA resolution than BMI alone.

Why it matters

Potential benefit: If successful, this study could provide insights into more effective treatment strategies for OSA in obese patients post-bariatric surgery.

How similar studies have gone: Previous studies have shown significant improvements in OSA resolution following bariatric surgery, indicating that this approach has been successful in similar contexts.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

Any informed person who is

* eligible for bariatric surgery: with severe obesity (BMI≥35-40) or morbid obesity (BMI≥40), with co-morbidities, who have not lost enough weight with prior lifestyle adaptations (balanced diet, physical activity) AND
* with diagnosed obstructive sleep apnoea (OSA) (AHI \> 15/hr on polysomnography) AND
* requiring treatment with Continuous Positive Air Pressure (CPAP)

Exclusion Criteria:

* Cognitive impairment - language barrier

Where it's running

  • CHU St Pierre
    Brussels, Belgium
    Recruiting
  • Ionela Bold
    Brussels, Belgium
    Recruiting

Study contacts

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.