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Thoracic percussion yields reversible mechanical changes in healthy subjects
Fernando S Guimarães1, Walter A Zin
1Laboratory of Respiration Physiology, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Ilha do Fundão, Rio de Janeiro, RJ, Brazil. fguimaraes_pg@yahoo.com.br
European Journal of Applied Physiology
|June 28, 2008
Summary
Thoracic percussion temporarily reduces pulmonary dynamic compliance, indicating potential lung collapse or constriction. However, these effects are reversible with deep breaths, restoring normal lung function.
Area of Science:
- Respiratory Physiology
- Pulmonary Mechanics
Background:
- Thoracic percussion is a common airway clearance technique.
- Its direct mechanical effects on lung parenchyma require further characterization.
Purpose of the Study:
- To investigate the mechanical effects of thoracic percussion on lung parenchyma in healthy individuals.
- To assess the reversibility of these effects using deep-breath maneuvers.
Main Methods:
- Respiratory impedance was measured using impulse oscillometry in 12 healthy subjects.
- Lung mechanics were analyzed using the least squares method in 6 healthy subjects.
- Measurements were taken before and after thoracic percussion, and after a deep-breath maneuver.
Main Results:
- Pulmonary resistance remained unchanged across all conditions.
- Pulmonary dynamic compliance significantly decreased after thoracic percussion but returned to baseline after deep breaths.
- Oscillometry-derived reactance parameters (AX and f(0)) increased post-percussion and normalized after deep breaths.
- Total impedance (Z5) and respiratory system resistance at 5 Hz (R5) showed no significant differences.
Conclusions:
- Thoracic percussion can induce reversible changes in respiratory mechanics, suggesting potential lung collapse or pneumoconstriction.
- Deep inspirations effectively counteract the mechanical alterations induced by thoracic percussion.
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