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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

Title
Increasing the Closed Quotient Improves Voice Quality After Type I Thyroplasty in Patients with Unilateral Vocal Cord Paralysis: Analysis Using SPEAD Program
Authors
Choi H.-S.Chung S.M.Lim J.-Y.Kim H.S.
Ewha Authors
정성민김한수
SCOPUS Author ID
정성민scopus; 김한수scopus
Issue Date
2008
Journal Title
Journal of Voice
ISSN
0892-1997JCR Link
Citation
vol. 22, no. 6, pp. 751 - 755
Indexed
SCIE; SCOPUS WOS scopus
Abstract
Summary: 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. © 2008 The Voice Foundation.
DOI
10.1016/j.jvoice.2007.03.011
Appears in Collections:
의학전문대학원 > 의학과 > Journal papers
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