Longitudinal Evaluation of Vocal Function After Thyroplasty Type I in the Treatment of Unilateral Vocal Paralysis


  • Presented at the Annual Meeting of the American Laryngological, Rhinological and Otological Society, Inc., Palm Desert, Calif., May 3, 1995.


This study investigated longitudinal changes of vocal efficiency and stability after primary thyroplasty type I. Fifty-three patients with unilateral vocal-fold paralysis underwent vocal-function evaluation preoperatively and at periodic intervals of 1, 3, and 6 months postoperatively. Vocal-function assessment included videostrobolaryngoscopic examination, acoustical and aerodynamic analysis, and perceptual judgment of voice characteristics. Parameters that included glottic-gap size, maximum phonation time, glottic-flow rate, jitter, harmonic/noise ratio, breathiness, hoarseness, loudness, and phrasing showed significant improvement after thyroplasty and remained stable as early as 1 month postoperatively, with only slight fluctuations over a 6-month period. Postoperative voice outcome was not affected by age, sex, duration of vocal symptoms, cause of paralysis, or preoperative pulmonary function.

Laryngoscope, 106:573-577, 1996