Changes in Body Fat and Morphologic Characteristics Associated With OSA Resolution After Bariatric Surgery

  • End date
    Dec 31, 2024
  • participants needed
  • sponsor
    Centre Hospitalier Universitaire Saint Pierre
Updated on 14 June 2022
bariatric surgery
gastric bypass
morbid obesity
weight control


Prospective study with inclusion of bariatric surgery candidates with diagnosed Obstructive Sleep Apnea and requiring treatment with Continuous Positive Air Pressure, aiming to evaluate at 2-6-12 months after bariatric surgery whether the relationship between biometric changes (reduction in neck circumference, height, waist/hip ratio, and fat and lean mass) and the resolution of OSA is better than the relationship between these biometric changes and BMI reduction.


Investigators are concerned about the high prevalence of Obstructive Sleep Apnoea syndrome (OSA) in the bariatric population. Postoperatively, there is a high rate of recovery from OSA. Indeed, investigators know from previous reports that weight loss is a very effective, but time consuming, strategy for treating OSA. Patients are therefore treated with CPAP (Continuous Positive Airway Pressure) while waiting for weight loss. In a recent meta-analysis, which focused on the effect of weight loss achieved through lifestyle interventions in 618 overweight and obese patients, the apnea-hypopnea index (AHI) decreased by an amount of 16/h for an average weight loss of 14 kg (1). However, the majority of patients are not able to maintain weight loss in the long term, and weight gain is associated with recurrence/aggravation of OSAS (2). Nowadays, bariatric surgery is a common strategy to achieve sustained and significant weight loss in obese patients. Sarkhosh et al. examined the impact of bariatric surgery (restrictive procedures, with a mild malabsorption component, or largely malabsorptive procedures) on sleep apnoea in 13,900 patients. Depending on the procedure, improvement or resolution of OSAS was achieved in 78-90% of patients (3).

Prospective longitudinal postoperative follow-up study : inclusion of patients who had scheduled bariatric surgery, diagnosed with OSA, AHI > 15 (polysomnography), treated with self-controlled CPAP (APAP), under remote monitoring;

Baseline measures:

  1. Anthropometric characteristics: body mass index (BMI), neck circumference, waist/hip ratio, fat mass + lean mass (bioelectrical impedance measurements),
  2. APAP treatment characteristics, mean APAP pressure, 95th percentile APAP pressure, APAP adherence.


  1. The 2-month follow-up: body mass index (BMI), neck circumference, waist/hip ratio, fat mass + fat-free mass (bioelectrical impedance measurements), mean APAP pressure, 95th percentile APAP pressure, APAP adherence. To assess potential regression of OSA with weight loss: home polygraphy after 4 nights off APAP (4).
  2. Six-month and 12-month follow-up: same as at 2 months. Follow-up stops in case of a polygraph showing an AHI <10, allowing APAP treatment to be stopped.

Condition Obesity, Obstructive Sleep Apnea
Treatment Bariatric Surgery
Clinical Study IdentifierNCT05315752
SponsorCentre Hospitalier Universitaire Saint Pierre
Last Modified on14 June 2022


Yes No Not Sure

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
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