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Updated: May 7, 2025

Point-of-Care Ultrasound: A Review of Ultrasound Parameters for Predicting Difficult Airways
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Correlation between different boundaries used in upper airway assessment.

Gediz Aksoz1, Hakan El2, J Martin Palomo3

  • 1Faculty of Dentistry, Department of Orthodontics, Hacettepe University, Sihhiye, Ankara, 06230, Turkey. gedizaksoz@gmail.com.

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Summary

This study found high correlations between oropharyngeal airway volume and minimum axial area measurements using various boundaries. These findings suggest consistent and reliable airway assessment methods for future research.

Keywords:
CBCTMinimum axial areaPharyngeal airwayUpper airwayVolume

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Area of Science:

  • Medical Imaging
  • Radiology
  • Anatomy

Background:

  • Oropharyngeal airway assessment is crucial for diagnosing conditions like sleep apnea.
  • Standardizing measurement boundaries for airway analysis is essential for reliable results.

Purpose of the Study:

  • To evaluate the correlation of volume and minimum axial area (MAA) measurements of the oropharyngeal airway.
  • To assess the impact of different upper and lower boundary definitions on these measurements.

Main Methods:

  • Retrospective analysis of Cone Beam Computed Tomography (CBCT) scans from 49 subjects.
  • Measurement of oropharyngeal airway volume and MAA using 32 segmentation variations with different boundary definitions.
  • Statistical analysis including Pearson correlation and intra-class correlation coefficient for reliability.

Main Results:

  • Excellent intra-observer reliability for both volume (0.997) and MAA (0.999) measurements.
  • High positive correlation (r = 0.896-0.999 for volume, r = 0.859-1.00 for MAA) across all boundary variations.
  • Consistent findings regardless of the specific upper and lower boundaries chosen.

Conclusions:

  • Measurements of oropharyngeal airway volume and MAA demonstrate high correlation across different boundary definitions.
  • The assessed upper and lower airway limits are reliable and can be safely applied in future upper airway studies.
  • Standardization of boundary selection is less critical due to high correlation, allowing flexibility in study design.