Correspondence of electroglottographic closed quotient to vocal fold impact stress in excised canine larynges

The purpose of this study was to explore the possible use of the electroglottographic closed quotient (EGG CQ) as a noninvasive estimate of vocal fold impact stress (SI). Two excised canine larynges were used. Each larynx was mounted and vocal fold oscillation was induced using a humidified air sour...

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Bibliographic Details
Published in:Journal of voice 1998-12, Vol.12 (4), p.415-423
Main Authors: Verdolini, Katherine, Chan, Roger, Titze, Ingo R., Hess, Markus, Bierhals, Wolfgang
Format: Article
Language:English
Subjects:
Animals
Closed quotient
Dogs
Electric Stimulation - methods
Electroglottography
Excised larynx
Female
Glottis - innervation
Intraglottal impact stress
Intraglottal SI
Larynx - physiology
Male
Stress, Mechanical
Vocal Cords - physiology
Vocal folds
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Summary:The purpose of this study was to explore the possible use of the electroglottographic closed quotient (EGG CQ) as a noninvasive estimate of vocal fold impact stress (SI). Two excised canine larynges were used. Each larynx was mounted and vocal fold oscillation was induced using a humidified air source. Twentyseven experimental trials were conducted for each larynx. Trials involved variations in vocal process gap, vocal fold elongation, and subglottic pressure. Simultaneous measures were made of vocal fold SI at the midpoint of the membranous vocal folds, and EGG CQ (dimensionless ratio). The results indicated that when threshold and saturation effects were excluded, the SI and the CQ were strongly related (linear correlation r = .83 and .96 for the two individual larynges, and .81 for the combined data). Within the region of linear relation, an increase of .15 in the CQ corresponded to about 1 kPa increase in SI for the combined data. Discussion focuses on possible clinical implications and the likely reasons for threshold and saturation phenomena.
ISSN:0892-1997
1873-4588
DOI:10.1016/S0892-1997(98)80050-7