Impact of Automatic Positive Airway Pressure on Treatment Compliance in OSA Patients Awaiting Bariatric Surgery

Study Overview
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Brief Summary
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Obstructive sleep apnea (OSA) is a syndrome characterized by intermittent dynamic obstruction of the upper airways that causes a fall in oxygen saturation, reflex sympathetic activation and sleep micro-arousals. In surgical patients, OSA is a well-known risk factor for perioperative complications. At Institut Universitaire de cardiologie et de Pneumologie de Quebec (IUCPQ), the investigators perform more than 450 bariatric surgeries per year. Consequently, the identification and management of OSA in this high-risk surgical population is an essential part of practice. Actual guidelines recommend that treatment for OSA be initiated before the surgical procedure. Presently, the first line treatment for OSA is continuous positive airway pressure (CPAP) therapy delivering a fixed pressure continuously to maintain the patency of the upper airways. However the compliance to this therapy is poor. An available alternative is automatic positive airway pressure (APAP) which delivers a variable amount of pressure to prevent reduction in airflow that accompanies upper airway obstruction. The APAP delivers the lowest pressure needed to prevent upper airways collapse. APAP significantly reduces the mean level of pressure delivered in comparison to conventional treatment. Theoretically, it seems logical that applying the lowest pressure necessary would allow a better device-patient synchrony and therefore improve patient's comfort.Recent trials comparing APAP and CPAP have shown that APAP is non-inferior to CPAP in controlling obstructive events. APAP would be a valuable alternative if it was not for its excess cost. However, APAP improves compliance to treatment in two types of population: poor compliant subjects and those needing high pressure levels. The investigators know that compliance to positive pressure is poor in patients without excessive daytime sleepiness, which represents the majority of patient waiting bariatric surgery. Moreover, in patients needing levels of pressure ≥ 10 water cm (cmH20), APAP improves treatment compliance, minimises side effects and improves quality of life. The review of 180 files of OSA patients treated by CPAP who had bariatric surgery in our center in 2012 demonstrated that the majority of patients needed high level pressure. These values suggest that APAP could improve treatment compliance in apneic patients waiting for bariatric surgery because they are usually poorly symptomatic and they generally require high positive pressure level.

Official Title
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Impact of Automatic Positive Airway Pressure on Treatment Compliance in Obstructive Sleep Apnea Patients Awaiting Bariatric Surgery

Conditions
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Obstructive Sleep Apnea, Treatment Compliance, Automatic Positive Airway Pressure

Intervention / Treatment
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* Device: Positive airway pressure for the treatment of OSA


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Obese patients with a BMI ≥ 40 kg/m2 or ≥ 35 kg/m2 with additional risk factors for cardiovascular disease and eligible for bariatric surgery; Laparoscopic bariatric surgery planned in 2-6 months. Procedures include biliopancreatic diversion with duodenal switch and sleeve gastrectomy; Recent diagnosis of obstructive sleep apnea made by a sleep study. The sleep study must be a overnight pulse oximetry showing a 3% desaturation index ≥ 25/hour or a polysomnography with a apnea + hypopnea index (AHI) ≥ 25/hour* ; No previous use of positive airway pressure device; ≥18 year old. Exclusion Criteria: Severe comorbidities (respiratory, cardiac, neurologic or metabolic unstable disease); Central sleep apnea; Obesity hypoventilation syndrome; Planned bariatric surgery by laparotomy; Contraindications to positive airway pressure therapy: pneumothorax within the preceding 6 months, cerebrospinal fluid leak, cranial surgery or trauma within the last year.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Automatic positive airway pressure<br>Automatic positive airway pressure treatment of obstructive sleep apnea | Device: Positive airway pressure for the treatment of OSA<br> <br> * Other names: Positive pressure device used: ResMed Autoset S9.;|
| Active Comparator: Continuous positive airway pressure<br>Continuous positive airway pressure for the treatment of obstructive sleep apnea | Device: Positive airway pressure for the treatment of OSA<br> <br> * Other names: Positive pressure device used: ResMed Autoset S9.;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Compliance of APAP and CPAP | Total utilisation time, daily hours of utilisation, percentage of nights with positive pressure | at time of surgery | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Mean pressure level with APAP and CPAP | Pressure applied (mean pressure and 90th/95th percentile), apnea hypopnea index, amount of mask leaks. | at time of surgery | 
| Mean pressure level with APAP and CPAP | Pressure applied (mean pressure and 90th/95th percentile), apnea hypopnea index, amount of mask leaks. | 1 month | 
| Residual apnea + hypopnea index | Number of residual respiratory events recorded by the positive pressure device during the treatment period | at time of surgery | 
| Residual apnea + hypopnea index | Number of residual respiratory events recorded by the positive pressure device during the treatment period | 1 month | 
| epworth sleepiness score | Somnolence measured by Epworth Sleepiness Scale; | at time of surgery | 
| quality of life score with APAP and CPAP | Quality of life measured by Questionnaire sur la Qualité de vie du Québec | at time of surgery | 
| Positive pressure therapy adverse events | Positive airway pressure adverse effects measured by a visual analogic scale. | at time of surgery | 
| Compliance of APAP and CPAP | Total utilisation time, daily hours of utilisation, percentage of nights with positive pressure | 1 month | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Obstructive sleep apnea, Treatment compliance, Automatic positive airway pressure, Continuous positive airway pressure, Bariatric surgery