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Vocal efficiency and aerodynamic aspects in voice disorders.

S Tanaka, W J Gould

    The Annals of Otology, Rhinology, and Laryngology
    |January 1, 1985
    PubMed
    Summary

    This study investigated vocal efficiency in laryngeal disease patients, finding generally low values. Aerodynamic factors like airflow and lung pressure help classify voice disorders.

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    Area of Science:

    • Laryngology
    • Speech Science
    • Bioacoustics

    Background:

    • Vocal efficiency is crucial for voice production.
    • Laryngeal diseases can significantly alter voice aerodynamics.
    • Understanding these changes is key to diagnosing and managing voice disorders.

    Purpose of the Study:

    • To investigate vocal efficiency variations in patients with laryngeal disease.
    • To explore the aerodynamic contributions of mean flow rate and intrapulmonic pressure to voice disorders.
    • To establish an aerodynamic-biomechanical classification for laryngeal pathologies.

    Main Methods:

    • Vocal efficiency was calculated using sound pressure level, mean flow rate, and intrapulmonic pressure.
    • Intrapulmonic pressure was measured noninvasively using plethysmography and pneumotachography.
    • Data from normal subjects and patients with laryngeal disease were compared.

    Main Results:

    • Vocal efficiency values were generally lower in patients with laryngeal disease compared to normal subjects.
    • Mean flow rate and intrapulmonic pressure were identified as key factors influencing vocal efficiency.
    • Specific patterns emerged: large glottic chink correlated with high flow rate; vocal fold mass with high flow rate and pressure; vocal fold stiffness with high pressure.

    Conclusions:

    • Abnormally low vocal efficiency is characteristic of the studied laryngeal diseases.
    • Aerodynamic parameters provide a basis for an aerodynamic-biomechanical classification of laryngeal disorders.
    • This classification aids in understanding the biomechanical underpinnings of voice dysfunction.

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