title: Treatment with continuous positive airway pressure is not effective in patients with sleep apnea but no daytime sleepiness. a randomized, controlled trial.
abstract: BACKGROUND
  The sleep apnea-hypopnea syndrome is defined by a pathologic number of respiratory events during sleep (the apnea-hypopnea index, defined as the number of apnea and hypopnea episodes per hour) and daytime symptoms (mostly, excessive sleepiness). In patients with the sleep apnea syndrome, treatment with continuous positive airway pressure (CPAP) normalizes both the apnea-hypopnea index and diurnal symptoms. However, the effect of CPAP in persons with a pathologic apnea-hypopnea index without daytime sleepiness is unclear.
  
  
  OBJECTIVE
  To investigate the short-term effects of CPAP on quality of life, objective sleepiness, cognitive function, and arterial blood pressure in nonsleepy patients with a pathologic apnea-hypopnea index.
  
  
  METHODS
  Multicenter randomized, placebo-controlled, parallel-group study.
  
  
  METHODS
  Six teaching hospitals in Spain.
  
  
  METHODS
  55 patients with an apnea-hypopnea index of 30 or greater who did not have daytime sleepiness (Epworth Sleepiness Scale score </= 10).
  
  
  METHODS
  Patients were randomly assigned to receive optimal (n = 29) or sham (n = 25) CPAP and were observed for 6 weeks.
  
  
  METHODS
  Quality of life, objective sleepiness (Multiple Sleep Latency Test score), cognitive function, and arterial blood pressure.
  
  
  RESULTS
  The intervention and control groups were similar in terms of mean (+/-SE) age (54 +/- 2 vs. 52 +/- 2 years), apnea-hypopnea index (54 +/- 3 vs. 57 +/- 4), Epworth Sleepiness Scale score (7.0 +/- 0.4 vs. 7.0 +/- 0.4) and adherence to CPAP treatment (5.0 +/- 0.4 vs. 4.0 +/- 0.5 hours/d). Other variables, such as quality of life, cognitive function, and arterial blood pressure, were also similar in both groups before treatment. After 6 weeks of CPAP or sham CPAP, none of these variables changed significantly.
  
  
  CONCLUSIONS
  In patients with an apnea-hypopnea index of 30 or greater and no subjective daytime sleepiness, CPAP does not modify quality of life, objective sleepiness, vigilance, attention, memory, information processing, visuomotor coordination, or arterial blood pressure. Treatment with CPAP is therefore not indicated in nonsleepy patients with a pathologic apnea-hypopnea index.
authors.affiliation: Servei de Pneumologia, Hospital Universitari Son Dureta, Andrea Doria, 55, 07014 Palma de Mallorca, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Barbé
authors.forename: L R
authors.initials: LR
authors.lastname: Mayoralas
authors.forename: J
authors.initials: J
authors.lastname: Duran
authors.forename: J F
authors.initials: JF
authors.lastname: Masa
authors.forename: A
authors.initials: A
authors.lastname: Maimó
authors.forename: J M
authors.initials: JM
authors.lastname: Montserrat
authors.forename: C
authors.initials: C
authors.lastname: Monasterio
authors.forename: M
authors.initials: M
authors.lastname: Bosch
authors.forename: A
authors.initials: A
authors.lastname: Ladaria
authors.forename: M
authors.initials: M
authors.lastname: Rubio
authors.forename: R
authors.initials: R
authors.lastname: Rubio
authors.forename: M
authors.initials: M
authors.lastname: Medinas
authors.forename: L
authors.initials: L
authors.lastname: Hernandez
authors.forename: S
authors.initials: S
authors.lastname: Vidal
authors.forename: N J
authors.initials: NJ
authors.lastname: Douglas
authors.forename: A G
authors.initials: AG
authors.lastname: Agustí
mesh_terms: D001794:Blood Pressure; D003071:Cognition; D005260:Female; D006801:Humans; D008875:Middle Aged; D017286:Polysomnography; D011175:Positive-Pressure Respiration / Q000379:methods*; D011446:Prospective Studies; D011788:Quality of Life; D012891:Sleep Apnea Syndromes / Q000503:physiopathology / Q000523:psychology / Q000628:therapy*