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Phonation Quotient Using Three Aerodynamic Instruments in the Disordered Voice.

Ashwini Joshi1, Christopher R Watts2, Jeremy Hathway3

  • 1University of Houston, Houston, Texas.

Journal of Voice : Official Journal of the Voice Foundation
|September 3, 2018
PubMed
Summary

Phonation quotient (PQ) measures effectively differentiate voice disorders, regardless of the aerodynamic instrument used. Low-cost devices provide reliable data for assessing laryngeal function.

Keywords:
AerodynamicsBenign lesionsPhonation quotientSpirometerVocal fold paralysis

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Area of Science:

  • Speech-Language Pathology
  • Aerodynamics
  • Laryngeal Physiology

Background:

  • Voice disorders impact laryngeal function and airflow.
  • Accurate aerodynamic assessment is crucial for diagnosis and management.
  • Phonation quotient (PQ) is a key metric derived from aerodynamic measures.

Purpose of the Study:

  • To compare phonation quotient (PQ) measurements across different aerodynamic instruments.
  • To evaluate the sensitivity of PQ to voice disorders (vocal fold paralysis/paresis vs. benign lesions).
  • To assess the reliability of low-tech versus high-tech aerodynamic devices for PQ calculation.

Main Methods:

  • Prospective, repeated measures design involving two patient groups (n=9 paralysis/paresis, n=8 benign lesions).
  • Aerodynamic data collected using a manual spirometer, digital spirometer, and Phonatory Aerodynamic System (PAS).
  • PQ calculated from maximum phonation time and vital capacity; statistical analyses included ANOVA and correlation.

Main Results:

  • Significant differences in PQ were observed based on the type of voice disorder.
  • No significant differences in PQ were found based on the instrument type used.
  • Strong positive correlations indicated high reliability between all three instruments for PQ measures.

Conclusions:

  • Phonation quotient (PQ) is sensitive to airflow differences related to vocal fold paralysis/paresis versus benign lesions.
  • Low-cost aerodynamic instruments can serve as reliable substitutes for pneumotachographs in clinical settings.
  • Findings support the use of accessible, low-tech tools for measuring aerodynamic variables in voice production.