Outcome measurements of voice disorders is an important new area for both t
he evaluation of voice-disordered patients and evaluation of treatment effi
cacy. The Voice Handicap Index (VHI) measures the patient's perception of t
he impact of his or her voice-disorder. The VHI was used in this study to m
easure the changes of the patient's perception following treatment for four
different voice disorders. The VHI showed a significant change following t
reatment for unilateral vocal fold paralysis, vocal cyst/polyp, and muscle
tension dysphonia. Results of this paper indicate that the VHI is a useful
instrument to monitor the treatment efficacy for voice disorders.