AVAPS-AE Efficacy Study
AVAPS-AE Efficacy Study
The purpose of this study is to evaluate the feasibility of using of the Average Volume
 Assured Pressure Support (AVAPS-AE) mode versus Continuous Positive Airway Pressure (CPAP)
 and bilevel pressure support ventilation (PSV) modes of ventilation in patients diagnosed
 with Obesity Hypoventilation syndrome (OHS).

 The investigators believe the use of the AVAPS-AE mode of ventilation after 6 weeks will
 yield daytime gas exchange values which are equivalent or no worse when compared to using
 CPAP and bilevel PSV modes of ventilation in the OHS population.
Inclusion Criteria:

 -  Age greater than or equal to 18 years of age; less than or equal to 70 years of age

 -  Diagnosis of Obesity Hypoventilation Syndrome via a diagnostic sleep study in the past
 3 months but have not initiated therapy

 -  BMI greater than or equal to 30 kg/m2

 -  Daytime PaCO2 greater than or equal to 45 mmHg

 -  Apnea Hypopnea index (AHI) > 5

 -  Daytime pH > 7.35

 -  Forced Expiratory Volume at 1 second / forced vital capacity (FEV1/FVC) > 70%

 Exclusion Criteria:

 -  Acutely ill, medically complicated or who are medically stable, or as otherwise
 determined by the investigator

 -  Respiratory alkalosis (pH > 7.45), per investigator discretion

 -  Emergency admissions on chronic respiratory failure

 -  Hospitalization for respiratory exacerbation < 6 weeks prior to screening visit

 -  Participants in whom PAP therapy is otherwise medically contraindicated

 -  Impaired upper airway function. For example, obstruction due to infections(laryngitis,
 epiglottis), craniofacial malformations, tumors, uvulopalatopharyngoplasty, presence
 of tracheostomy, or bilateral vocal cord palsy that does not allow tolerance of
 Non-invasive positive pressure ventilation (NPPV)

 -  Facial trauma, burns, surgery or anatomical abnormalities interfering with mask fit.