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Related Experiment Videos

Waveform and spectral analysis of crackles

M Mori, K Kinoshita, H Morinari

    Thorax
    |November 1, 1980
    PubMed
    Summary

    Lung crackles, common in tuberculosis and chronic bronchitis, have frequency components mainly between 0.1 to 1 kHz. Their waveforms suggest a two-part origin: an initial airway opening shock and a subsequent resonant lung response.

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    Area of Science:

    • Respiratory Medicine
    • Bioacoustics
    • Pulmonary Physiology

    Background:

    • Crackles are adventitious lung sounds often associated with various respiratory conditions.
    • Understanding the acoustic properties of crackles can aid in diagnosing pulmonary diseases.

    Purpose of the Study:

    • To analyze the acoustic characteristics of crackles using waveform and spectral analysis.
    • To elucidate the physical mechanisms generating crackles and their transmission pathways.

    Main Methods:

    • Recording crackles from patients with tuberculosis and chronic bronchitis.
    • Utilizing waveform and spectral analysis to examine frequency components and signal structure.
    • Investigating the directional transmission properties of crackles.

    Main Results:

    • Crackles exhibit dominant frequency components within the 0.1 to 1 kHz range.
    • Crackles possess distinct "starting" and "decay" waveform segments.
    • The "starting segment" likely originates from airway opening, while the "decay segment" results from lung resonance.

    Conclusions:

    • The acoustic properties of crackles are determined by airway mechanics and lung resonance.
    • Chest wall recordings are influenced by the spatial relationship between the sound source and the microphone.
    • This analysis provides insights into the pathophysiology of crackles in respiratory diseases.

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