Phonation threshold pressure estimation using electroglottography in an airflow redirection system. Laryngoscope 2009 Dec;119(12):2378-83
Date
08/19/2009Pubmed ID
19688842Pubmed Central ID
PMC2789983DOI
10.1002/lary.20611Scopus ID
2-s2.0-73949103815 (requires institutional sign-in at Scopus site) 11 CitationsAbstract
OBJECTIVES/HYPOTHESIS: The present study proposed to estimate phonation threshold pressure (PTP) noninvasively using airflow redirection into a pneumatic capacitance system.
STUDY DESIGN: Prospective study.
METHODS: 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.
RESULTS: Mean SGP was 9.02 +/- 3.27 cm H(2)O, and mean PTP was 3.68 +/- 1.41 cm H(2)O. 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).
CONCLUSIONS: 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.
Author List
Rieves AL, Regner MF, Jiang JJAuthor
Michael Regner MD Associate Professor in the Radiology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AdolescentAdult
Electrodiagnosis
Humans
Larynx
Phonation
Pressure
Prospective Studies
Speech Production Measurement
Tracheotomy
Velopharyngeal Insufficiency
Young Adult
