Vocal function in subjects with compensated unilateral vocal fold paralysis pre- and post-medialisation thyroplasty

grantor: University of TorontoUnilateral vocal fold paralysis is a condition that can cause significant vocal dysfunction. Treatment options include behavioural therapy or surgical procedures. The purpose of the present study was to investigate specific vocal function parameters in subjects with a compensated unilateral vocal fold paralysis, and to investigate the effects of medialisation thyroplasty on these parameters. The pathophysiology of the voice abnormality associated with a unilateral vocal fold paralysis and the relevant literature regarding treatment has been reviewed. Measurements included indirect laryngoscopy, acoustic data (fundamental frequency, percent jitter and shimmer), fundamental frequency and intensity range, voice range profile, phonation threshold pressure, perceptual evaluation and a reading task. Results indicated that most subjects exhibited a reduced fundamental frequency and intensity range compared to normal values prior to surgery. A comparison of data from before and after medialisation thyroplasty indicated that most subjects showed improvements in the vocal parameters evaluated.M.Sc