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Effects of thyroplasty type I on vocal fold vibration.
Laryngoscope. 2000 Jul; 110(7):1086-91.L

Abstract

OBJECTIVE

To ascertain effects of medialization thyroplasty on vocal fold vibration in glottic incompetence dysphonia.

STUDY DESIGN

Quantitative videostroboscopic glottic measurements and vocal function study were perioperatively undertaken in 20 patients undergoing Isshiki's thyroplasty type I.

METHODS

In digitized images, the glottal area, glottal width, posterior glottal width, and amplitude over an entire glottal cycle were measured and normalized by membranous vocal fold length. The ratio of closed phase to total phase of vibratory cycle was calculated from the data of the glottal area and the glottal width at the middle point of the membranous vocal fold. Well-accepted acoustic, aerodynamic, and perceptual measures analyzed vocal function.

RESULTS

Glottal area and glottal width were reduced after surgery. While preoperative closure of glottal area was incomplete in all 20 patients, incomplete closure was obtained in 16 patients after surgery. In these 16 patients, closure of glottal width at the middle point of the membranous vocal fold was complete, whereas a posterior glottal gap remained in 14 patients. Closed phase over one cycle of glottal width waveform and amplitude of vocal fold vibration were increased after surgery. Glottal area, glottal width, posterior glottal width, and closed phase over one cycle of glottal width waveform correlated with vocal function measures.

CONCLUSIONS

Thyroplasty type I reduces a glottal gap and increases closed phase over one cycle and amplitude of vocal fold vibration, although a posterior glottal gap remains. With the improved glottic vibration, thyroplasty type I provides more efficient phonation in patients with glottic incompetence dysphonia.

Authors+Show Affiliations

Department of Otolaryngology, Nishi-Kobe Medical Center, Kobe, Japan. koichi.omori@nifty.ne.jpNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

10892675

Citation

Omori, K, et al. "Effects of Thyroplasty Type I On Vocal Fold Vibration." The Laryngoscope, vol. 110, no. 7, 2000, pp. 1086-91.
Omori K, Slavit DH, Kacker A, et al. Effects of thyroplasty type I on vocal fold vibration. Laryngoscope. 2000;110(7):1086-91.
Omori, K., Slavit, D. H., Kacker, A., Blaugrund, S. M., & Kojima, H. (2000). Effects of thyroplasty type I on vocal fold vibration. The Laryngoscope, 110(7), 1086-91.
Omori K, et al. Effects of Thyroplasty Type I On Vocal Fold Vibration. Laryngoscope. 2000;110(7):1086-91. PubMed PMID: 10892675.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of thyroplasty type I on vocal fold vibration. AU - Omori,K, AU - Slavit,D H, AU - Kacker,A, AU - Blaugrund,S M, AU - Kojima,H, PY - 2000/7/13/pubmed PY - 2000/8/6/medline PY - 2000/7/13/entrez SP - 1086 EP - 91 JF - The Laryngoscope JO - Laryngoscope VL - 110 IS - 7 N2 - OBJECTIVE: To ascertain effects of medialization thyroplasty on vocal fold vibration in glottic incompetence dysphonia. STUDY DESIGN: Quantitative videostroboscopic glottic measurements and vocal function study were perioperatively undertaken in 20 patients undergoing Isshiki's thyroplasty type I. METHODS: In digitized images, the glottal area, glottal width, posterior glottal width, and amplitude over an entire glottal cycle were measured and normalized by membranous vocal fold length. The ratio of closed phase to total phase of vibratory cycle was calculated from the data of the glottal area and the glottal width at the middle point of the membranous vocal fold. Well-accepted acoustic, aerodynamic, and perceptual measures analyzed vocal function. RESULTS: Glottal area and glottal width were reduced after surgery. While preoperative closure of glottal area was incomplete in all 20 patients, incomplete closure was obtained in 16 patients after surgery. In these 16 patients, closure of glottal width at the middle point of the membranous vocal fold was complete, whereas a posterior glottal gap remained in 14 patients. Closed phase over one cycle of glottal width waveform and amplitude of vocal fold vibration were increased after surgery. Glottal area, glottal width, posterior glottal width, and closed phase over one cycle of glottal width waveform correlated with vocal function measures. CONCLUSIONS: Thyroplasty type I reduces a glottal gap and increases closed phase over one cycle and amplitude of vocal fold vibration, although a posterior glottal gap remains. With the improved glottic vibration, thyroplasty type I provides more efficient phonation in patients with glottic incompetence dysphonia. SN - 0023-852X UR - https://www.unboundmedicine.com/medline/citation/10892675/Effects_of_thyroplasty_type_I_on_vocal_fold_vibration_ L2 - https://doi.org/10.1097/00005537-200007000-00004 DB - PRIME DP - Unbound Medicine ER -