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KMID : 0389520020090020106
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Sleep Medicine.Psychophysiology
2002 Volume.9 No. 2 p.106 ~ p.114
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Comparison of Daytime Sleepiness between Normal Subjects and Patients with Sleep Disorders and Analysis of Its Clinical Implications
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Lee Jin-Sung
Kim Seog-Ju
Choi Jong-Bae
Jeong Do-Un
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Abstract
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Objectives: Daytime sleepiness is a common symptom and is associated with sleep behavior, sleep deprivation, and night shift, etc. It is also one of the most important symptoms of sleep disorders like obstructive sleep apnea (OSA). According tour survey on Korean literature, a few studies have dealt with daytime sleepiness, and we have not been able to locate any study comparing normal subjects with polysomnography?proven sleep disorder patients regarding daytime sleepiness. We aimed at compang daytime sleepiness among normal healthy daytime workers, medical students being expected to have daytime sleepiness due to chronic sleep deprivation, and patients having sleep disorders diagnosed with polysomnography. We also studied the association between subjective daytime sleepiness and objective potysomnographic findings in patients with sleep disorders.
Methods: One hundred three hospital workers, 137 medical students, and patients with sleep disorders were studied. Sleep disorders included OSA, periodic limb movements in sleep (PLMS), insomnia, and narcolepsy. The degree of subjective sleepiness in each group was measured by the Korean version of Epworth sleepiness scale and compared. The relationship betweeipoysomnographic findings reflecting severity of sleep disorder in each patient group and subjective sleepiness was analyzed. As for patients with narcolepsy, the relationship between the mean sleep latency and subjective sleepiness was studied.
Results: There was a significant difference of ES score (F=68.190, dF=5.752, p<0.001) among daytime workers, medical students, and sleep disorder patients. In OSA patient group, the degree of the sleepiness had no significant correlation either with mean 02 satuaration (p=0.062) or with RDI ?(p=0.807). h PLMS patient group, there was no correlation between periodic limb. movement index (PLMI) and subjective sleepiness (p=0.761). In narcolepsy patient group, the subjective sleepiness had neorrelation with mean sleep latency measured with MSLT (p=0.055).
Conclusion: We found a significant difference of subjective sleepiness among daytime workers, medical students, and patients with sleep disorders. However, no consistent correlation was found between severity of subjective sleepiness and objective poyso mnographic findings reflecting severity of each sleep disorder. This research confirms that the evaluation of subjective sleepiness is important clinically, but it cannot substitute the objective measures such as nocturnal polysomnography and MSLTSteep Medicine and Psychophysiology 2002: 9(2) : 106-114
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KEYWORD
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Daytime sleepiness, Epworth sleepiness scale, Sleep disorder,
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