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Evaluation of the Normal Airway Morphology Using Optical Coherence Tomography
Zhu-Quan Su1, Wei-Jie Guan1, Shi-Yue Li1
1State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China.
Chest
|July 3, 2019
Summary
Small airway cartilage thickness decreases with age. Luminal area reduction in medium-to-small airways is a key morphologic change associated with aging, particularly in individuals over 55 years old.
Area of Science:
- Pulmonary Medicine
- Anatomy
- Aging Research
Background:
- The anatomical characteristics of small airways and their cartilage distribution in relation to aging are not well understood.
- Previous research has not fully elucidated the correlation between airway structure and the aging process.
Purpose of the Study:
- To investigate the in vivo morphologic characteristics of small airways.
- To determine how airway structural changes correlate with age using endobronchial optical coherence tomography (EB-OCT).
Main Methods:
- Recruited 112 subjects with peripheral pulmonary nodules for CT scans, spirometry, and EB-OCT.
- Measured airway internal diameter, inner area (Ai), airway wall area percentage (Aw%), and airway cartilage thickness.
- Analyzed EB-OCT airway structural characteristics across different age groups and evaluated the association with age.
Main Results:
- Small airways predominantly originate from the seventh bronchial generation, with cartilage present but decreasing in distal airways (seventh to ninth generation).
- Airway cartilage thickness progressively decreased with older age.
- Inner airway area (Ai) showed a positive correlation with age in the 40-54 age group, but a negative correlation in the 55-69 age group.
Conclusions:
- Small airways are primarily found at the seventh generation, retaining cartilaginous structures, though their distribution diminishes distally.
- Cartilage thickness in airways decreases with advancing age.
- A reduction in the luminal area of medium-to-small airways appears to be a significant morphologic change associated with aging (over 55 years).
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