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Analysis of Sleep Questionnaires of Patients who Performed Overnight Polysomnography at the University Hospital  

Kang, Ji Ho (Department of Internal Medicine, The Catholic University of Korea, College of Medicine)
Lee, Sang Haak (Department of Internal Medicine, The Catholic University of Korea, College of Medicine)
Kwon, Soon Seog (Department of Internal Medicine, The Catholic University of Korea, College of Medicine)
Kim, Young Kyoon (Department of Internal Medicine, The Catholic University of Korea, College of Medicine)
Kim, Kwan Hyoung (Department of Internal Medicine, The Catholic University of Korea, College of Medicine)
Song, Jeong Sup (Department of Internal Medicine, The Catholic University of Korea, College of Medicine)
Park, Sung Hak (Department of Internal Medicine, The Catholic University of Korea, College of Medicine)
Moon, Hwa Sik (Department of Internal Medicine, The Catholic University of Korea, College of Medicine)
Park, Yong Moon (Department of Preventive Medicine, The Catholic University of Korea, College of Medicine)
Publication Information
Tuberculosis and Respiratory Diseases / v.60, no.1, 2006 , pp. 76-82 More about this Journal
Abstract
Background : The objective of this study was to understand sleep-related problems, and to determine whether the sleep questionnaires is a clinically useful method in patients who need polysomnography. Methods : Subjects were patients who performed polysomnography and who asked to answer a sleep questionnaires at the Sleep Disorders Clinic of St. Paul's Hospital, Catholic University of Korea. Baseline characteristics, past medical illness, behaviors during sleep-wake cycle, snoring, sleep-disordered breathing and symptoms of daytime sleepiness were analyzed to compare with data of polysomnography. Results : The study population included 1081 patients(849 men, 232 female), and their mean age was $44.2{\pm}12.8years$. Among these patients, 38.9% had an apnea-hypopnea index(AHI)<5, 27.9% had $5{\leq}AHI<20$, 13.2% had $20{\leq}AHI<40$, and 20.0% had $40{\leq}AHI$. The main problems for visiting our clinic were snoring(91.7%), sleep apnea(74.5%), excessive daytime sleepiness(8.0%), insomnia(4.3%), bruxism(1.1%) and attention deficit(0.5%). The mean value of frequency of interruptions of sleep was 1.6 and the most common reason was urination(46.3%). Epworth Sleepiness Scale(ESS) had a weak correlation with AHI(r=0.209, p<0.01). When we performed analysis of sleep questionnaires, there were significant differences in the mean values of AHI according to the severity of symptoms including snoring, daytime sleepiness, taking a nap and arousal state after wake(p<0.05). Conclusion : On the basis of statistical analysis of sleep questionnaires, the severity of subjective symptoms such as ESS, snoring, daytime sleepiness and arousal state after wake correlated with the AHI significantly. Therefore the sleep questionnaires can be useful instruments for prediction of the severity of sleep disorder, especially sleep-disordered breathing.
Keywords
Sleep questionnaires; Polysomnography; Obstructive sleep apnea;
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