Impact of Cricothyroid Muscle Contraction on Vocal Fold Vibration: Experimental Study with High-Speed Videoendoscopy.
J Voice
; 31(3): 300-306, 2017 May.
Article
en En
| MEDLINE
| ID: mdl-27692725
ABSTRACT
OBJECTIVES:
The aim of this study was to evaluate the effects of cricothyroid muscle contraction on vocal fold vibration, as evaluated with high-speed videoendoscopy, and to identify one or more aspects of vocal fold vibration that could be used as an irrefutable indicator of unilateral cricothyroid muscle paralysis. STUDYDESIGN:
This was an experimental study employing excised human larynges.METHODS:
Twenty freshly excised human larynges were evaluated during artificially produced vibration. Each larynx was assessed in three situations bilateral cricothyroid muscle contraction, unilateral cricothyroid muscle contraction, and no contraction of either cricothyroid muscle. The following parameters were evaluated by high-speed videoendoscopy fundamental frequency, periodicity, amplitude of vocal fold vibration, and phase symmetry between the vocal folds.RESULTS:
Although neither unilateral nor bilateral cricothyroid muscle contraction altered the periodicity of vibration or the occurrence of phase asymmetry, there was a significant decrease in fundamental frequency in parallel with decreasing longitudinal tension. We also found an increase in vibration amplitude of right and left vocal folds, which were similar in terms of their behavior for this parameter in the various situations studied.CONCLUSION:
Our results suggest that differences in vibration amplitude and phase symmetry between vocal folds are not reliable indicators of unilateral cricothyroid muscle paralysis.Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Fonación
/
Grabación en Video
/
Pliegues Vocales
/
Parálisis de los Pliegues Vocales
/
Músculos Laríngeos
/
Laringoscopía
/
Contracción Muscular
Tipo de estudio:
Prognostic_studies
Límite:
Humans
/
Male
Idioma:
En
Revista:
J Voice
Asunto de la revista:
OTORRINOLARINGOLOGIA
Año:
2017
Tipo del documento:
Article