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Endoscopic Studies I: Bronchoscopy and Thoracoscopy01:30

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Endoscopy is a non-surgical medical technique used to examine a person's internal organs and vessels. This lesson will focus on two types of endoscopic studies: bronchoscopy and thoracoscopy.
Bronchoscopy
Description
Bronchoscopy is a procedure that involves direct visualization of the larynx, trachea, and bronchi for diagnostic and therapeutic purposes. A flexible fiber optic or rigid bronchoscope is used to carry out the procedure. The fiber-optic bronchoscope is more frequently used due to...

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Related Experiment Video

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Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
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Three-dimensional upper airway phenotyping and OSA severity: a CT-based study.

JiaYue Wang1, Tao Li1, Su Hua Sun1

  • 1Department of Otorhinolaryngology Head and Neck Surgery, Peking University Third Hospital, Beijing, China.

European Radiology
|May 14, 2026
PubMed
Summary

The ratio of total volume to minimum cross-sectional area (TV-NP-OP/MIN-CSA) is a key 3D anatomical marker for obstructive sleep apnea (OSA) severity. This "Anatomical Risk Index" aids in personalized treatment and risk stratification for OSA patients.

Keywords:
Anatomical phenotypeComputed tomographyObstructive sleep apneaThree-dimensional imagingUpper airway

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Area of Science:

  • Medical Imaging
  • Pulmonology
  • Anatomy

Background:

  • Obstructive sleep apnea (OSA) involves recurrent upper airway collapse during sleep.
  • While anatomical factors are crucial, the relationship between 3D upper airway dimensions and OSA severity is not fully understood, hindering personalized treatment strategies.

Purpose of the Study:

  • To identify the most relevant 3D upper airway anatomical parameter correlating with obstructive sleep apnea (OSA) severity.
  • To evaluate the potential of this parameter as a reliable imaging biomarker for OSA risk stratification.

Main Methods:

  • 69 OSA patients underwent polysomnography and computed tomography (CT) scans.
  • 3D upper airway segmentation and measurement of parameters including minimum cross-sectional area (MIN-CSA) and the ratio of total volume to MIN-CSA (TV-NP-OP/MIN-CSA).
  • Statistical analyses including correlation, ROC, and logistic regression were used to assess associations with the apnea-hypopnea index (AHI).

Main Results:

  • The TV-NP-OP/MIN-CSA ratio, termed "Anatomical Risk Index," strongly correlated with OSA severity (r=0.473, p<0.001).
  • This index demonstrated good diagnostic performance for moderate-to-severe and severe OSA and was an independent predictor across BMI subgroups.
  • Excellent measurement reliability (ICCs > 0.90) was observed, with no volumetric parameters showing significant correlation with AHI.

Conclusions:

  • The TV-NP-OP/MIN-CSA ratio is a robust 3D anatomical parameter significantly associated with OSA severity.
  • This CT-derived "Anatomical Risk Index" can serve as a valuable imaging biomarker for identifying high-risk OSA phenotypes and guiding personalized treatment.