title: Determinants of continuous positive airway pressure compliance in a group of Chinese patients with obstructive sleep apnea.
abstract: OBJECTIVE
  To assess continuous positive airway pressure (CPAP) compliance and factors associated with CPAP compliance among Chinese patients with obstructive sleep apnea (OSA).
  
  
  METHODS
  A prospective study of 112 consecutive patients with newly diagnosed OSA commencing CPAP treatment.
  
  
  METHODS
  A university teaching hospital.
  
  
  RESULTS
  The following factors were evaluated for any correlation with objective CPAP compliance (effective mask pressure [hours per day]) at 1 month and 3 months: age, baseline apnea-hypopnea index (AHI), common OSA symptoms, minimum arterial oxygen saturation (SaO(2)), mean SaO(2), arousal index (AI), Epworth sleepiness scale (ESS), education level, CPAP levels, satisfaction with CPAP, side effects, and machine cost. There were 101 male and 11 female patients, with a mean (+/- SD) age of 45.6 +/- 1.2 years; body mass index, 29.3 +/- 5.2 kg/m(2); AI, 60 +/- 18/h; AHI, 48 +/- 24/h; minimum SaO(2) of 70 +/- 17%; and mean SaO(2) of 86 +/- 7%. ESS fell from 12.9 +/- 4.0 (baseline) to 5.2 +/- 4.7 at 3 months (p < 0.001). Objective CPAP compliance was 5.4 +/- 1.6 h/d and 5.3 +/- 1.6 h/d, while 75% and 72% of our patients were using CPAP objectively for > or = 4 h/d and at least 70% of the nights per week at 1 month and 3 months, respectively. Following univariate analysis of variance, a high baseline AHI (p = 0.006 and p = 0.004) was associated with higher objective CPAP compliance at 1 month and 3 months, respectively.
  
  
  CONCLUSIONS
  CPAP usage and compliance were high in this patient population. A high baseline AHI was the only significant independent predictor of better CPAP compliance.
authors.affiliation: Department of Medicine and Therapeutics, Centre for Clinical Trials and Epidemiological Research, Prince of Wales Hospital, Shatin, New Territories, Hong Kong. dschui@cuhk.edu.hk
authors.forename: D S
authors.initials: DS
authors.lastname: Hui
authors.forename: D K
authors.initials: DK
authors.lastname: Choy
authors.forename: T S
authors.initials: TS
authors.lastname: Li
authors.forename: F W
authors.initials: FW
authors.lastname: Ko
authors.forename: K K
authors.initials: KK
authors.lastname: Wong
authors.forename: J K
authors.initials: JK
authors.lastname: Chan
authors.forename: C K
authors.initials: CK
authors.lastname: Lai
mesh_terms: D000367:Age Factors; D002681:China; D004522:Educational Status; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood; D010349:Patient Compliance; D017060:Patient Satisfaction; D011175:Positive-Pressure Respiration / Q000009:adverse effects; D011446:Prospective Studies; D020181:Sleep Apnea, Obstructive / Q000503:physiopathology / Q000628:therapy*; D012894:Sleep Stages; D011795:Surveys and Questionnaires
chemical_list: D010100:Oxygen