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Regional lung function in bilateral diaphragmatic paralysis

T C Amis, G Ciofetta, J M Hughes

    Clinical Science (London, England : 1979)
    |December 1, 1980
    PubMed
    Summary
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    Bilateral diaphragmatic paralysis alters lung function distribution. Ventilation is reduced in dependent lung zones, and perfusion becomes more uniform, impacting gas exchange efficiency.

    Area of Science:

    • Pulmonary Physiology
    • Respiratory Medicine

    Background:

    • Bilateral diaphragmatic paralysis presents unique challenges in respiratory mechanics.
    • Understanding regional lung function is crucial for managing patients with respiratory impairments.

    Purpose of the Study:

    • To investigate the regional distribution of ventilation and perfusion in patients with bilateral diaphragmatic paralysis.
    • To compare lung function distribution in different postures.

    Main Methods:

    • Utilized radioactive gases (81mKr and 85mKr) for continuous inhalation and infusion.
    • Assessed regional ventilation and perfusion during tidal breathing in supine, upright, and lateral decubitus postures.

    Main Results:

    • Ventilation distribution was reversed in dependent zones in supine/lateral postures, unlike normal subjects.

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  • Perfusion distribution became more uniform in upright posture and altered in supine/lateral postures.
  • Ventilation/perfusion ratios were more uniform in patients, except in the right lateral decubitus posture.

    • Conclusions:

    • Altered mechanical interactions of the respiratory system explain ventilation distribution changes.
    • Low end-expiratory lung volume likely influences the observed blood flow distribution.
    • Diaphragmatic paralysis significantly impacts regional lung function and gas exchange patterns.