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Related Experiment Videos

Phonation threshold pressure measurements during phonation by airflow interruption.

J Jiang1, T O'Mara, D Conley

  • 1Department of Otolaryngology-Head and Neck Surgery, Northwestern University Medical School, Chicago, IL 60611, USA.

The Laryngoscope
|March 25, 1999
PubMed
Summary

This study developed a noninvasive method to measure phonation threshold pressure (PTP). Patients with vocal fold polyps showed significantly higher PTP than healthy individuals, indicating a new diagnostic tool for voice disorders.

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Area of Science:

  • Laryngology
  • Acoustic analysis
  • Speech science

Background:

  • Measuring phonation threshold pressure (PTP) is crucial for understanding voice production.
  • Existing PTP measurement methods are often invasive and clinically impractical.
  • A noninvasive method for estimating PTP is needed for clinical application.

Purpose of the Study:

  • To develop and validate a noninvasive system for estimating PTP.
  • To compare PTP in individuals with and without vocal fold polyps.
  • To assess PTP at various vocal intensity levels.

Main Methods:

  • An airflow interruption system was employed for noninvasive PTP estimation.
  • Subjects sustained tones, with airflow, intramask pressure, and acoustic output recorded.

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  • PTP was predicted by analyzing pressure differences before phonation cessation.

    • Main Results:

    • Mean PTP was significantly higher in patients with vocal fold polyps compared to controls.
    • At 75 dB, mean PTP was 4.79 cm H2O for polyp patients vs. 2.38 cm H2O for controls.
    • At 85 dB, mean PTP was 7.37 cm H2O for polyp patients vs. 2.98 cm H2O for controls.

    Conclusions:

    • The developed noninvasive system accurately estimates PTP.
    • Elevated PTP in vocal fold polyp patients suggests increased effort for phonation.
    • This method offers a promising noninvasive tool for voice disorder assessment.