Fundamental Frequency in Excised Human Larynges after Anterior Glottic Web Formation of Various Extents
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Citações na Scopus
4
Tipo de produção
article
Data de publicação
2019
Título da Revista
ISSN da Revista
Título do Volume
Editora
SAGE PUBLICATIONS LTD
Autores
PINHEIRO, Thais Goncalves
ISHIKAWA, Camila Cristina
MONTAGNOLI, Arlindo Neto
Citação
OTOLARYNGOLOGY-HEAD AND NECK SURGERY, v.160, n.4, p.672-678, 2019
Resumo
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.
Palavras-chave
voice, voice quality, cadaver, experimental epidemiology, pitch perception, kymography, laryngoscopy
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