Phonation threshold pressure estimation using electroglottography in an airflow redirection system
Version of Record online: 17 AUG 2009
Copyright © 2009 The American Laryngological, Rhinological, and Otological Society, Inc.
Volume 119, Issue 12, pages 2378–2383, December 2009
How to Cite
Rieves, A. L., Regner, M. F. and Jiang, J. J. (2009), Phonation threshold pressure estimation using electroglottography in an airflow redirection system. The Laryngoscope, 119: 2378–2383. doi: 10.1002/lary.20611
- Issue online: 20 NOV 2009
- Version of Record online: 17 AUG 2009
- Manuscript Accepted: 4 JUN 2009
- NIH. Grant Number: R01 DC008153
- National Institute on Deafness and Other Communication Disorders
- Phonation threshold pressure;
- subglottal pressure;
- laryngeal aerodynamics;
- mechanical interruption
The present study proposed to estimate phonation threshold pressure (PTP) noninvasively using airflow redirection into a pneumatic capacitance system.
Subjects phonated into the device, which interrupts airflow mechanically and redirects the flow into a pneumatic capacitor. Five interruptions were effected per trial. PTP was estimated as the difference between subglottal pressure (SGP) and transglottal pressure at phonation offset. The novel method was tested for consistency in 20 normal human subjects at low (75 dB) and high (85 dB) sound pressure levels. The device was tested for validity on a tracheotomy patient.
Mean SGP was 9.02 ± 3.27 cm H2O, and mean PTP was 3.68 ± 1.41 cm H2O. Intrasubject coefficient of variation, a measure of intrasubject consistency, was 0.33 ± 0.23. Statistically significant differences existed between the means of SGP but not PTP at 75 dB and 85 dB. The correlation coefficient between accepted and experimental SGP in a tracheotomy patient was 0.947 (P < .001).
Measurements corresponded well to previously reported values, and intrasubject variability was low, indicating the device was consistent. Testing on a tracheotomy patient demonstrated validity. More research is needed to determine the sensitivity and specificity of the device in differentiating between normal and pathological voices. This device may have clinical application as a noninvasive and reliable method of estimating PTP and indicating that laryngeal health is likely abnormal. Laryngoscope, 2009