Upper airway morphology in patients with obstructive sleep apnea syndrome: Effects of lateral positioning

Taro Soga, Seiichi Nakata, Fumihiko Yasuma, Akiko Noda, Tatsuki Sugiura, Hiroshi Yatsuya, Yasuo Koike, Norio Ozaki, Tsutomu Nakashima

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Objectives: The aim of this study was to clarify the interaction of lateral and supine sleeping positions with upper airway morphology in patients with obstructive sleep apnea syndrome (OSAS). Patients and methods: Thirty-one patients with OSAS, whose apnea/hypopnea index (AHI: number of episodes of apnea or hypopnea per hour) was over 15, were enrolled in this study. Subjects were divided in two groups according to positional effects on their AHI. In six patients, a lateral posture decreased the AHI by 50% and more (responders); in the remaining 25, lateral positioning decreased the AHI by less than 50% or even increased the AHI (nonresponders). AHI and body mass index (BMI) of the responders tended to be lower and their mean age was younger than those of nonresponders, but these differences were not statistically significant. We compared the upper airway morphology between the responders and the nonresponders regarding the tonsil size, tongue position (modified Mallanpati grade, reflecting the space between the tongue and soft palate) and the width of the fauces and retroglossal space. In addition, we compared nasal resistance between the groups using active rhinomanometry. Results: The width of the fauces was significantly greater (P = 0.041) among the responders than among the nonresponders. However, the other parameters were not consistently different between the two, and these differences were not statistically significant either. Conclusions: The distance between the fauces was the sole morphological feature to distinguish the responders and the nonresponders to the positional therapy in patients with OSAS. Lateral positioning during sleep might be a recommended sleep hygiene for OSAS patients with wide fauces.

Original languageEnglish
Pages (from-to)305-309
Number of pages5
JournalAuris Nasus Larynx
Volume36
Issue number3
DOIs
Publication statusPublished - 01-06-2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Surgery
  • Otorhinolaryngology

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