Summary
The effects of the vocal processes resection on phonation in an animal without vocal
fold paralysis have not been clarified. The present study used an in vivo animal model with vocal processes resection and excised larynges phonation model
to investigate the effects of the vocal processes resection on phonation. Six months
after resection of bilateral vocal fold processes, glottal airflow, subglottal air
pressure, acoustic signals, and ultra-high-speed video images were recorded in the
excised larynges phonation model of canine. Glottal aerodynamic parameters were estimated
by calculation of subglottal pressure and glottal flow. Histological analyses of the
scarred were assessed for wound healing completion. In the vocal processes resection
group, fundamental frequency(F0) and vocal intensity decreased, and the Jitter and Shimmer increased significantly.
The phonation threshold power(PTW) of the vocal processes resection was significantly
higher than controls. The vibratory amplitude of the vocal fold posterior and visual
vocal fold vibration length increased. Expression of collagen I-III in scarred tissue
samples in vocal process resection was similar to controlling soft tissue specimens
around vocal process cartilage, and collagen fiber formed matured thick bundles. The
results suggest that the F0, voice quality, and vocal intensity significantly decreased after complete wound
healing of vocal processes resection in canines without vocal folds paralysis. The
higher PTW and posterior scarred vocal vibration may be the dynamic reasons.
Key Words
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Article info
Publication history
Published online: January 03, 2023
Accepted:
December 16,
2022
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2022 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
