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Fundamental Frequency in Excised Human Larynges after Anterior Glottic Web Formation of Various Extents.

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Date
2019-04
Author
Pinheiro, Thais Gonçalves
Author
Ishikawa, Camila Cristina
Author
Imamura, Rui
Author
Frizzarini, Ronaldo
Author
Montagnoli, Arlindo Neto
Author
Tsuji, Domingos Hiroshi
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Artigo
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Abstract
OBJECTIVE: To determine the effect of vocal fold anterior web formation on fundamental frequency with a cadaveric excised larynx model. STUDY DESIGN: Experimental study with excised human larynges. Setting: Academic tertiary care hospital. SUBJECTS AND METHODS: Sixteen freshly excised human larynges were evaluated with high-speed videoendoscopy and digital kymography during artificially produced vibration. Each larynx was assessed in 4 conditions: preoperative controls and after 25%, 33%, and 50% decreases in the vibratory portion of the vocal folds. The following parameters were evaluated: fundamental frequency, periodicity, vocal fold vibration amplitude, phase symmetry, and glottic closure. RESULTS: The mean fundamental frequencies were 208.87, 250.20, 292.37, and 342.67 Hz for preoperative controls and 25%, 33%, and 50% reductions in vibratory length of the vocal folds, respectively. Fundamental frequency increased with each increase in anterior glottic web extent, and the difference among the groups was statistically significant in absolute values in hertz and in semitone elevation. The mathematical models for estimating postoperative fundamental frequency had a statistically significant coefficient. The vibration of the vocal folds remained periodic in all larynges before and after the procedures. CONCLUSION: There was a significant and progressive increase in the fundamental frequency with each enlargement of anterior glottic web. Based on the control frequency, mathematical models could estimate the value of the fundamental frequency after the procedure.
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Otolaryngol Head Neck Surg. 2019 Apr;160(4):672-678. Doi: 10.1177/0194599818813007
xmlui.dri2xhtml.METS-1.0.item-source-uri
https://doi.org/10.1177/0194599818813007
Subject
Voice
 
Voice Quality
 
Cadáver
 
Experimental Epidemiology
 
Pitch Perception
 
Kymography
 
Laryngoscopy
 
URI
http://digital.bibliotecaorl.org.br/handle/forl/431
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Contact Us | Send Feedback

Divisão de Biblioteca e Documentação do Departamento
de Otorrinolaringologia da Faculdade de Medicina USP

Rua Artur de Azevedo, 46 CEP: 05404-000 São Paulo/SP - Brasil

Tel: (11) 3062-4097 Email: biblioteca@forl.org.br

Medicina USPFORL
Desenvolvido por Logo DGL Sistemas