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Static lung function in puppies after pneumonectomy

G T Ford, W Galaugher, L Forkert

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |June 1, 1981
    PubMed
    Summary
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    Puppies that underwent left pneumonectomy (lung removal) showed increased functional residual capacity (FRC) and residual volume (RV) despite normal total lung capacity (TLC). This suggests chest wall changes, not lung recoil, drive altered lung volumes post-surgery.

    Area of Science:

    • Pulmonary Physiology
    • Thoracic Surgery
    • Comparative Medicine

    Background:

    • Lung development and adaptation after partial lung resection are not fully understood.
    • Surgical removal of lung tissue can impact overall respiratory mechanics.
    • Investigating compensatory mechanisms in remaining lung tissue is crucial for understanding lung plasticity.

    Purpose of the Study:

    • To investigate the long-term effects of left pneumonectomy on lung volumes and respiratory mechanics in growing puppies.
    • To determine if changes in lung recoil or chest wall mechanics contribute to altered lung function post-pneumonectomy.
    • To analyze regional lung function distribution after surgical removal of lung mass.

    Main Methods:

    • Left pneumonectomy was performed on puppies at 9 weeks of age, with sham-operated littermates serving as controls.

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  • Animals were studied at 20 weeks of age, assessing lung volume, weight, and surface area.
  • Pulmonary function tests, including total lung capacity (TLC), functional residual capacity (FRC), residual volume (RV), and pressure-volume curves, were conducted.

    • Main Results:

    • Post-pneumonectomy dogs had similar lung volumes, weights, and surface areas compared to controls, but larger FRC/TLC and RV/TLC ratios.
    • Lung pressure-volume curves indicated increased chest wall recoil, not altered lung recoil, in post-pneumonectomy animals.
    • Regional lung function studies revealed abnormal volume distribution, particularly at the left base, but this did not fully explain the overall increase in FRC and RV.

    Conclusions:

    • Compensatory lung growth after pneumonectomy results in similar overall lung size but altered volume distribution and increased FRC/TLC and RV/TLC.
    • Increased chest wall recoil, potentially due to shape changes, is a primary factor in the altered lung mechanics post-pneumonectomy.
    • These findings highlight the complex interplay between lung and chest wall adaptation following significant lung resection in a developmental model.