This may be due to thoracic wall abnormalities, particularly those that are either associated with structural immobility or defect thoracoplasty or pain rib fracture. Percussion: Percussion is the act of tapping on a surface, thereby setting the underlying structures in motion, creating a sound and palpable vibration. Any deviation from the normal anatomical relationship of the skeletal system and the associated muscles would be expected to cause some abnormality in the inspiratory cycle of ventilation. Peadar Noone Dr. Click on the video icon for further discussion and demonstration of thoracic expansion.
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