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Lung mechanics in papain-treated rabbits.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 1, 1986
Summary
Airway cartilage softening increased lung resistance and decreased expiratory flow in rabbits. This suggests cartilage regulates airway caliber during breathing.
Area of Science:
- Pulmonary Physiology
- Respiratory Mechanics
Background:
- Airway cartilage provides structural support to the airways.
- Softening of airway cartilage may impact lung function.
Purpose of the Study:
- To investigate the effects of airway cartilage softening on static and dynamic lung mechanics.
- To determine the mechanism limiting maximal expiratory flow in a papain-induced animal model.
Main Methods:
- Papain was administered intravenously to rabbits to induce airway cartilage softening.
- Lung mechanics were assessed 24 hours post-injection, measuring lung volumes, pressure-volume curves, lung resistance, and maximal expiratory flows.
Main Results:
- Papain-treated rabbits exhibited significantly increased lung resistance compared to controls.
- Maximal expiratory flows were decreased across all lung volumes in the papain group.
- No significant differences were observed in lung volumes, pressure-volume curves, or chest wall compliance.
Conclusions:
- Increased airway wall compliance is likely the mechanism responsible for limiting maximal expiratory flow.
- The study suggests that airway cartilage plays a crucial role in regulating airway caliber during normal tidal breathing.