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Temporal pulmonary function changes in cervical cord injury.

F Haas, K Axen, H Pineda

    Archives of Physical Medicine and Rehabilitation
    |March 1, 1985
    PubMed
    Summary
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    Pulmonary function in spinal cord injury patients improves initially due to muscle recovery and resolves inflammation. Later, altered lung mechanics cause gradual changes, potentially leading to chronic hypoventilation.

    Area of Science:

    • Respiratory Medicine
    • Neurology
    • Physiology

    Background:

    • Complete cervical cord transection significantly impacts respiratory control and mechanics.
    • Understanding temporal changes in pulmonary function is crucial for managing patients with spinal cord injuries.

    Purpose of the Study:

    • To characterize the two-stage temporal changes in pulmonary function following complete cervical cord transection.
    • To elucidate the underlying mechanisms contributing to these pulmonary function alterations.

    Main Methods:

    • Longitudinal assessment of pulmonary function parameters including lung volumes and airflows.
    • Analysis of respiratory muscle function, inflammation resolution, and altered respiratory mechanics.

    Main Results:

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    • Stage 1 (acute to post-acute): Rapid increases in vital capacity (VC), inspiratory capacity (IC), total lung capacity (TLC), and airflows; decreased functional residual capacity (FRC).
    • Stage 2 (post-acute onwards): Gradual VC increase and FRC decrease; stable TLC and ventilatory indices.
    • Early changes linked to respiratory muscle recovery and inflammation resolution; later changes attributed to decreased lung compliance and increased airway resistance.

    Conclusions:

    • Pulmonary function in cervical spinal cord injury evolves in two distinct stages.
    • Altered respiratory mechanics, including lung and chest wall changes, are key drivers of these temporal modifications.
    • Potential for chronic hypoventilation exists due to the cumulative effects of these mechanical changes.