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Sound transfer function of the congested canine lung

R L Donnerberg, C K Druzgalski, R L Hamlin

    British Journal of Diseases of the Chest
    |January 1, 1980
    PubMed
    Summary
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    Lung sound transfer function changes can quantify pulmonary congestion. This study in dogs shows altered sound transmission correlates with lung liquid accumulation, offering a new diagnostic index.

    Area of Science:

    • Pulmonary Physiology
    • Bioacoustics
    • Medical Diagnostics

    Background:

    • Pulmonary congestion involves lung liquid accumulation.
    • Accurate, non-invasive methods to assess lung liquid are needed.
    • Sound transfer function (STF) may reflect lung tissue properties.

    Purpose of the Study:

    • To investigate STF alterations in canine lungs with induced congestion.
    • To correlate STF changes with lung liquid accumulation.
    • To evaluate STF as a quantitative index for pulmonary congestion.

    Main Methods:

    • Pulmonary congestion was induced in a canine model using left atrial balloon inflation.
    • Lung STF was measured using passive sound transmission (50 Hz to 2 kHz).
    • Congestion severity was quantified by post-mortem lung wet-to-dry weight ratios.

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    Main Results:

    • STF magnitude decreased with increasing pulmonary congestion.
    • Differential STF values showed a strong correlation with lung wet-to-dry weight ratios.
    • STF provided a quantitative measure of intravascular and extravascular lung liquid accumulation.

    Conclusions:

    • Changes in lung STF serve as a reliable index for pulmonary congestion.
    • STF measurement offers a quantitative method to assess lung liquid accumulation.
    • This approach may have clinical applications in diagnosing and monitoring lung conditions.