Phonation threshold flow in elongated excised larynges. Ann Otol Rhinol Laryngol 2008 Jul;117(7):548-53
Date
08/15/2008Pubmed ID
18700432Pubmed Central ID
PMC2922005DOI
10.1177/000348940811700714Scopus ID
2-s2.0-51449084661 (requires institutional sign-in at Scopus site) 12 CitationsAbstract
OBJECTIVES: This study proposes the use of a new parameter of vocal aerodynamics, phonation threshold flow (PTF). The sensitivities of the PTF and the phonation threshold pressure (PTP) were quantitatively compared to the percent of vocal fold elongation from physiologic length.
METHODS: Ten excised canine larynges were mounted on a bench apparatus capable of controlling vocal fold elongation. Subglottal airflow was gradually increased until the onset of phonation. Elongation of the vocal folds was varied from +0% (physiologic length) to +15%, and the PTF and PTP were measured.
RESULTS: The mean PTFs at physiologic vocal fold length ranged from 101 to 217 mL/s. No statistically significant relationship was found to exist between the size of the larynx and the measured PTF values (p = .404). The average percent change of PTF compared to the magnitude of elongation was found to be statistically significant (p < .001). The data indicated that the PTF was proportional to the percent of vocal fold elongation.
CONCLUSIONS: The PTF was positively correlated with vocal fold elongation and the PTP for small magnitudes of elongation. The results suggest that the PTF may be indicative of the biomechanical properties of the vocal folds, thus providing a possibly valuable tool in the clinical evaluation of laryngeal function.
Author List
Jiang JJ, Regner MF, Tao C, Pauls SAuthor
Michael Regner MD Associate Professor in the Radiology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Air MovementsAnimals
Biomechanical Phenomena
Dogs
In Vitro Techniques
Larynx
Phonation
Vocal Cords
