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A retrospective study: does upper airway morphology differ between non-positional and positional obstructive sleep

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  • 1Otolaryngology, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai, China.

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Positional obstructive sleep apnea (POSA) patients have wider upper airways compared to non-positional (NPOSA) patients. These anatomical differences, particularly in the glossopharynx, are key to understanding sleep apnea variations.

Keywords:
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Area of Science:

  • Respiratory Medicine
  • Sleep Medicine
  • Anatomy

Background:

  • Obstructive sleep apnea (OSA) is a common disorder characterized by repeated upper airway collapse during sleep.
  • OSA can be categorized as positional (POSA) or non-positional (NPOSA), suggesting underlying anatomical or physiological differences.
  • Understanding these differences is crucial for developing targeted treatment strategies.

Purpose of the Study:

  • To investigate and compare the upper airway morphological characteristics between patients with POSA and NPOSA.
  • To identify specific anatomical features that differentiate POSA from NPOSA.

Main Methods:

  • A retrospective study involving 75 patients (30 POSA, 45 NPOSA) who underwent polysomnography (PSG) and computed tomography (CT).
  • Analysis of polysomnography data, including apnea/hypopnea index (AHI) and lateral-AHI (L-AHI).
  • Detailed measurement of upper airway structures using CT, focusing on palatopharyngeal and glossopharyngeal dimensions.

Main Results:

  • Significant differences were observed in AHI, L-AHI, soft palate length (SPL), and palatopharyngeal cross-sectional area and coronal diameter (CD) between POSA and NPOSA groups.
  • POSA patients generally exhibited larger palatopharyngeal areas and narrower SPLs compared to NPOSA.
  • L-AHI showed correlations with multiple upper airway dimensions, including palatopharyngeal and glossopharyngeal areas and CD, as well as BMI and SPL.

Conclusions:

  • NPOSA patients tend to have smaller upper airway dimensions, particularly a narrower coronal diameter, and a longer soft palate compared to POSA patients.
  • These distinct morphological features likely contribute significantly to the differences observed between positional and non-positional obstructive sleep apnea.