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Laryngoscope. 2010 Mar;120(3):643-8. doi: 10.1002/lary.20758.

Severe obstructive sleep apnea: sleepy versus nonsleepy patients.

Author information

1
Sleep Disorders Unit, Loewenstein Hospital-Rehabilitation Center, Raanana, Israel. arieo@clalit.org.il

Abstract

OBJECTIVES/HYPOTHESIS:

To compare demographic and polysomnographic data of sleepy versus nonsleepy severe obstructive sleep apnea (OSA) patients according to the Epworth Sleepiness Scale (ESS).

STUDY DESIGN:

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.

PMID:
19941283
DOI:
10.1002/lary.20758
[Indexed for MEDLINE]

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