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Respiratory function after paralysis of the right hemidiaphragm
The American Review of Respiratory Disease
|January 1, 1983
Summary
Following phrenic nerve injury, lung volumes decreased, but the body compensated. A 45-year-old man developed a new rapid inspiratory muscle recruitment pattern to maintain breathing.
Area of Science:
- Pulmonary Physiology
- Respiratory Mechanics
Background:
- Investigating the physiological adaptations to diaphragmatic dysfunction.
- Assessing lung function changes after phrenic nerve injury.
Observation:
- A 45-year-old male patient underwent right phrenic nerve crush, resulting in hemidiaphragm paralysis.
- Lung function tests showed decreased total lung capacity, functional residual capacity, and forced vital capacity, with unchanged residual volume and static compliance.
Findings:
- Ventilatory response to carbon dioxide (CO2) was preserved, but the P0.1 response to CO2 increased, indicating altered respiratory control.
- Analysis revealed a new, rapid pattern of inspiratory pressure development.
- Regional gas washout was slowed on the paralyzed side, yet the apex-to-base gradient of regional volumes remained intact.
- Xenon-133 (133Xe) bolus distribution shifted away from the paralyzed side, with minimal changes at increased airflow.
Implications:
- The study suggests the development of compensatory mechanisms involving rapid recruitment of accessory inspiratory muscles following hemidiaphragm paralysis.
- These findings highlight the plasticity of the respiratory system in adapting to significant neuromuscular compromise.