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The Interaction Between Craniofacial Computed Tomographic Dimensional Parameters and BMI in Obstructive Sleep Apnea.

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Summary

Pharyngeal bony frame dimensions and hyoid bone position significantly impact obstructive sleep apnea syndrome (OSAS) severity. These factors interact with body mass index (BMI), influencing OSAS outcomes.

Keywords:
Computed tomographyImagingObesityObstructive sleep apneaPharyngeal dimensionsUpper airway dimensions

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Area of Science:

  • Anatomy
  • Sleep Medicine
  • Radiology

Background:

  • The dimensional parameters of the pharyngeal bony frame and hyoid bone position are not fully understood in relation to obstructive sleep apnea syndrome (OSAS) severity.
  • The interplay between these anatomical features, body mass index (BMI), and OSAS severity requires further investigation.

Purpose of the Study:

  • To investigate the impact of pharyngeal bony frame dimensions (length, width) and hyoid position on OSAS severity.
  • To explore the interactions between these craniofacial parameters and BMI in OSAS patients.

Main Methods:

  • Retrospective cross-sectional study of 108 male OSAS patients.
  • Polysomnography to determine apnea-hypopnea index (AHI).
  • Upper airway CT scans to measure inter-pterygoid distance (IPD), hard palate-to-hyoid (HP-H) distance, and gnathion plane-to-hyoid (GP-H) distance.

Main Results:

  • Longer pharynx and inferiorly placed hyoid bone correlated with increased AHI (OSAS severity).
  • GP-H distance correlated with BMI; HP-H and IPD did not show direct correlation with OSAS severity.
  • An interaction was found between BMI and HP-H distance, but not GP-H and BMI. IPD correlated with patient age.

Conclusions:

  • Pharynx length and hyoid bone position are significant determinants of OSAS severity.
  • The interaction between craniofacial parameters and BMI varies, influencing OSAS severity differently.
  • Hard palate width increases with age but does not correlate with OSAS severity.