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Laryngoscope. 2014 Apr;124 Suppl 2:S1-13. doi: 10.1002/lary.24512. Epub 2014 Feb 7.

Direct simultaneous measurement of intraglottal geometry and velocity fields in excised larynges.

Author information

1
Department of Otolaryngology/Head & Neck Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio, U.S.A.

Abstract

OBJECTIVES/HYPOTHESIS:

Current theories regarding the mechanisms of phonation are based on assumptions about the aerodynamics between the vocal folds during the closing phase of vocal fold vibration. However, many of these fundamental assumptions have never been validated in a tissue model. In this study, the main objective was to determine the aerodynamics (velocity fields) and the geometry of the medial surface of the vocal folds during the closing phase of vibration. The main hypothesis is that intraglottal vortices are produced during vocal fold closing when the glottal duct has a divergent shape and that these vortices are associated with negative pressures.

STUDY DESIGN:

Experiments using seven excised canine larynges.

METHODS:

The particle imaging velocimetry (PIV) method was used to determine the velocity fields at low, mid-, and high subglottal pressures for each larynx. Modifications were made to previously described PIV methodology to allow the measurement of both the intraglottal velocity fields and the position of the medial aspects of the vocal fold.

RESULTS:

At relatively low subglottal pressures, little to no intraglottal vortices were seen. At mid- and high subglottal pressures, the flow separation vortices occurred and produced maximum negative pressures, relative to atmospheric, of -2.6 to -14.6 cm H2 O. Possible physiological and surgical implications are discussed.

CONCLUSIONS:

Intraglottal vortices produce significant negative pressures at mid- and high subglottal pressures. These vortices may be important in increasing maximum flow declination rate and acoustic intensity.

LEVEL OF EVIDENCE:

N/A.

KEYWORDS:

Larynx; intraglottal geometry; intraglottal velocity fields; laryngeal aerodynamics; laryngeal biomechanics; phonation; vocal fold vibration; voice; vortices

PMID:
24510612
DOI:
10.1002/lary.24512
[Indexed for MEDLINE]
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