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Related Experiment Videos

Sound speed in pulmonary parenchyma.

D A Rice

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |January 1, 1983
    PubMed
    Summary

    Sound speed in horse lungs varies with lung volume and pressure, indicating the lung parenchyma acts as an elastic continuum. These findings aid in understanding clinical lung sound observations.

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    Area of Science:

    • Pulmonary Physiology
    • Acoustics
    • Biophysics

    Background:

    • Audible sound waves are used to assess lung function.
    • The acoustic properties of lung tissue are not fully understood.
    • Understanding sound propagation in the lung can aid clinical interpretation.

    Purpose of the Study:

    • To measure sound speed across excised horse lung lobes.
    • To investigate factors influencing sound speed in lung tissue.
    • To determine the primary pathway of sound travel within the lung.

    Main Methods:

    • Measured transit time of audible sound waves across excised horse lung lobes at varying volumes and pressures.
    • Estimated sound speed using linear regression analysis.
    • Experimented with different gases (air, helium, sulfur hexafluoride) and pressures (0.1 to 7 atm).

    Main Results:

    • Sound speed in air-filled lungs ranged from 25 to 70 m/s, dependent on lung volume.
    • Gas composition and ambient pressure significantly altered sound speed.
    • Reduced sound speed suggests propagation through lung parenchyma, not airways or vessels.

    Conclusions:

    • The lung parenchyma behaves as an elastic continuum for audible sound.
    • Sound speed is influenced by lung density and stiffness, which are affected by pressure and gas composition.
    • These findings may help quantify clinical lung sound observations.

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