Comparison of Positional and Non-Positional Obstructive Sleep Apnea Patients by Nocturnal Polysomnography

야간수면다원검사를 이용한 자세성 및 비자세성 수면무호흡증 환자의 비교 연구

  • Park, Min-Woo (Department of Oral Medicine and Oral Diagnosis School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Cho, Jung-Hwan (Department of Oral Medicine and Oral Diagnosis School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Park, Won-Kyu (Department of Oral Medicine and Oral Diagnosis School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Nam, Jin-Woo (Department of Oral Medicine and Oral Diagnosis School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Yun, Chong-Il (Department of Oral Medicine and Oral Diagnosis School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Chung, Jin-Woo (Department of Oral Medicine and Oral Diagnosis School of Dentistry and Dental Research Institute, Seoul National University)
  • 박민우 (서울대학교 치의학대학원 구강내과진단학교실, 치학연구소) ;
  • 조정환 (서울대학교 치의학대학원 구강내과진단학교실, 치학연구소) ;
  • 박원규 (서울대학교 치의학대학원 구강내과진단학교실, 치학연구소) ;
  • 남진우 (서울대학교 치의학대학원 구강내과진단학교실, 치학연구소) ;
  • 윤종일 (서울대학교 치의학대학원 구강내과진단학교실, 치학연구소) ;
  • 정진우 (서울대학교 치의학대학원 구강내과진단학교실, 치학연구소)
  • Published : 2009.12.30

Abstract

Objectives: The aim of this study was to evaluate the differences in the polysomnography data between positional and non-positional obstructive sleep apnea (OSA) patients. Methods: Forty-seven patients diagnosed with OSA were evaluated using full night polysomnography. According to the criteria of Cartwright et al., the patients were classified into two groups with 37 positional (supine apnea-hypopnea index [AHI] $\geq$ 2x's the lateral AHI) and 10 non-positional (supine AHI < 2x's the lateral AHI) OSA patients, and the differences of polysomnography data between the two groups were evaluated. Results: There were no significant differences in demographic variables (age, gender, and BMI), daytime sleepiness, overall AHI, total arousal index, and percent time of snoring between two groups. However, AHI, arousal index, and mean oxygen saturation ($SpO_2$) of the REM sleep stage were significantly more severe in the positional OSA group than the non-positional OSA group. Mean $SpO_2$ and the lowest $SpO_2$ during overall sleep stage were also significantly lower in the positional OSA group than the non-positional OSA group. Conclusions: Our results of differences in the polysomnography data of REM sleep stage suggest that non-positional OSA patients may have higher collapsibility of the oropharyngeal airway during sleep than positional OSA patients.

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