title: Severe obstructive sleep apnea: sleepy versus nonsleepy patients.
abstract: OBJECTIVE
  To compare demographic and polysomnographic data of sleepy versus nonsleepy severe obstructive sleep apnea (OSA) patients according to the Epworth Sleepiness Scale (ESS).
  
  
  METHODS
  Retrospective cohort.
  
  
  METHODS
  Six hundred forty-four consecutive severe (apnea-hypopnea index [AHI] >or= 30) adult OSA patients who underwent a polysomnographic evaluation in our sleep disorders unit. ESS data were available in 569 (88.3%). Three hundred twenty-seven (57.5%) patients had ESS > 10.
  
  
  RESULTS
  Sleepy severe OSA patients are slightly younger and more obese than nonsleepy patients. These sleepy patients have shorter sleep latency and lower percentage of slow wave sleep. They consistently show a higher AHI, both supine and lateral AHI, have a higher number of short arousals, and a higher arousal index. They also have higher snoring loudness in the supine and both lateral positions and a lower minimal SaO(2) in rapid eye movement and non-rapid eye movement sleep. After adjusting for confounders, a logistic regression model points to apnea index as a significant prognostic factor for excessive daytime sleepiness.
  
  
  CONCLUSIONS
  Severe OSA sleepy patients have a syndrome that is significantly more severe than nonsleepy patients. Sleepy patients have worse sleep-related breathing parameters, and their sleep patterns are lighter and more fragmented than nonsleepy patients. Apnea index appears as an important prognostic factor for excessive daytime sleepiness.
authors: Sleep Disorders Unit, Loewenstein Hospital-Rehabilitation Center, Raanana, Israel. arieo@clalit.org.il
authors: Arie
authors: A
authors: Oksenberg
authors: Elena
authors: E
authors: Arons
authors: Khitam
authors: K
authors: Nasser
authors: Ophir
authors: O
authors: Shneor
authors: Henryk
authors: H
authors: Radwan
authors: Donald S
authors: DS
authors: Silverberg
mesh_terms: D000367:Age Factors; D016009:Chi-Square Distribution; D003710:Demography; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000150:complications; D017286:Polysomnography; D011379:Prognosis; D012372:ROC Curve; D012189:Retrospective Studies; D012307:Risk Factors; D012890:Sleep / Q000502:physiology*; D020181:Sleep Apnea, Obstructive / Q000503:physiopathology*; D012894:Sleep Stages / Q000502:physiology; D012895:Sleep, REM / Q000502:physiology