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Increasing the Closed Quotient Improves Voice Quality After Type I Thyroplasty in Patients with Unilateral Vocal Cord Paralysis: Analysis Using SPEAD Program

Authors
 Hong-Shik Choi  ;  Sung Min Chung  ;  Jae-Yol Lim  ;  Han Su Kim 
Citation
 JOURNAL OF VOICE, Vol.22(6) : 751-755, 2008 
Journal Title
 JOURNAL OF VOICE 
ISSN
 0892-1997 
Issue Date
2008
MeSH
Adult ; Aged ; Female ; Humans ; Male ; Middle Aged ; Software* ; Speech Acoustics* ; Thyroid Cartilage/surgery* ; Vocal Cord Paralysis/surgery* ; Voice Quality* ; Young Adult
Keywords
Voice quality ; Type I thyroplasty ; Closed quotient
Abstract
The aim of this study was to determine the importance of the closed quotient in the improvement of voice quality after medialization thyroplasty by measuring acoustic parameters at the sentence level. The clinical records of patients who received type I thyroplasty were reviewed retrospectively. All of the patients underwent the perceptual, acoustic, and aerodynamic evaluation before the surgery and on the 60th postoperative day. The perceptual and acoustic measurements were obtained from a recording of a passage read aloud by the patients. Acoustic and aerodynamic parameters were investigated. A paired t test was used to compare presurgery and postoperative results. A correlation analysis was also used to discern which parameters were most correlated with improvement of postoperative voice quality. Statistically significant improvements were observed in subglottic pressure (Psub), maximum phonation time, and mean flow rate. Average fundamental frequency and average closed quotients were found to be the parameters that were most associated with an improvement of postoperative breathiness. The /G/ grade of GRBAS scale quality was found to be most associated with Psub and shimmer (P<0.05). An increase of the contact area of both vocal folds induced improvement in aerodynamic parameters and led to the stabilization of vocal fold vibration. This effect resulted in improvement of the acoustic parameters (shimmer, jitter, signal-to-noise ratio, voice range profile) and voice quality
Full Text
http://www.sciencedirect.com/science/article/pii/S089219970700046X
DOI
10.1016/j.jvoice.2007.03.011
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Otorhinolaryngology (이비인후과학교실) > 1. Journal Papers
Yonsei Authors
Lim, Jae Yol(임재열) ORCID logo https://orcid.org/0000-0002-9757-6414
Choi, Hong Shik(최홍식)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/107822
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