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Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
Published on: February 3, 2014
Phonation threshold flow in elongated excised larynges
Jack J Jiang1, Michael F Regner, Chao Tao
1Department of Surgery, Division of Otolaryngology-Head and Neck Surgery, University of Wisconsin-Madison School of Medicine and Public Health, Madison, Wisconsin, USA.
The Annals of Otology, Rhinology, and Laryngology
|August 15, 2008
Summary
This study introduces phonation threshold flow (PTF) as a new vocal aerodynamics measure. PTF increases with vocal fold elongation, suggesting its potential for assessing laryngeal biomechanics.
Area of Science:
- Vocal aerodynamics and biomechanics.
Background:
- Phonation threshold pressure (PTP) is a key metric in vocal function.
- Vocal fold elongation affects aerodynamic parameters during voice production.
Purpose of the Study:
- To introduce and evaluate phonation threshold flow (PTF) as a novel aerodynamic parameter.
- To quantitatively compare the sensitivity of PTF and PTP to vocal fold elongation.
Main Methods:
- Excised canine larynges were used in a bench apparatus.
- Vocal fold elongation was systematically increased from 0% to 15%.
- Phonation threshold flow (PTF) and phonation threshold pressure (PTP) were measured at each elongation level.
Main Results:
- Phonation threshold flow (PTF) ranged from 101 to 217 mL/s at physiologic vocal fold length.
- PTF showed a statistically significant positive correlation with the percentage of vocal fold elongation (p < .001).
- No significant relationship was found between larynx size and PTF values (p = .404).
Conclusions:
- Phonation threshold flow (PTF) is positively correlated with vocal fold elongation.
- PTF correlates with PTP at lower magnitudes of elongation.
- PTF may serve as a valuable clinical tool for evaluating laryngeal biomechanical properties and function.
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