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Related Experiment Videos

Stress at the pleural surface

B G Murphy, P T Macklem

    Respiration Physiology
    |October 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Pleural pressure transmission involves contact forces and liquid pressure. Tidal swings in pleural liquid pressure (deltaPliq) can exceed pleural surface pressure swings (deltaPpl), indicating they are not always equivalent.

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    Area of Science:

    • Respiratory Physiology
    • Biomechanics
    • Thoracic Medicine

    Background:

    • Force transmission between visceral and parietal pleura is crucial for lung function.
    • Existing models often simplify the complex interactions within the pleural space.

    Purpose of the Study:

    • To model force transmission between the visceral and parietal pleura.
    • To develop a new equation relating pleural surface pressure (Ppl) to contact pressure (Pcon), contact area (Acon), pleural liquid pressure (Pliq), and liquid anfractuosities area (Aliq).
    • To explain discrepancies between tidal swings in Pliq (deltaPliq) and Ppl (deltaPpl).

    Main Methods:

    • Developed a model of pleural force transmission via contact pressure and pleural liquid pressure.
    • Derived a new equation: Ppl = f(Pcon, Acon, Pliq, Aliq).

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  • Analyzed the model under the assumption of constant pleural liquid volume during tidal breathing.

    • Main Results:

    • The model explains why deltaPliq can be greater than deltaPpl during tidal breathing.
    • It predicts that changes in lung elastic recoil may affect Pliq and Ppl differently.
    • Concluded that deltaPliq is not necessarily equivalent to deltaPpl.

    Conclusions:

    • The developed model provides a framework for understanding pleural pressure dynamics.
    • Limitations in measurement technology currently restrict a complete solution.
    • The findings highlight the independent contributions of contact forces and liquid pressure to overall pleural mechanics.