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Physiologic assessment of isshiki type III thyroplasty
Author(s) -
Slavit David H.,
Maragos Nicolas E.,
Lipton Richard J.
Publication year - 1990
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1288/00005537-199008000-00009
Subject(s) - electroglottograph , vocal folds , jitter , quotient , medicine , mathematics , surgery , speech recognition , audiology , larynx , computer science , phonation , telecommunications , pure mathematics
Isshiki type III thyroplasty is a laryngeal framework surgical procedure that lowers a patient's pitch. To objectively assess the procedure, preoperative and postoperative voice recordings, as well as electroglottography and photo‐glottography were performed. Jitter, shimmer, and glot‐tographic quotients were measured to assess changes in vibratory pattern. The mean and range of frequencies in contextual speech was also determined. Analysis of the preoperative and postoperative data from two patients with over 1 year follow‐up showed a decrease in frequency of vibration. Postoperatively, the vocal folds still vibrated in a regular pattern as described by the myoelastic‐aerody‐namic theory. There was no increase in jitter or shimmer quotient. The Isshiki type HI thyroplasty appears capable of lowering fundamental frequency of speech without adversely affecting the vibratory mode of the vocal folds.