RESUMO
BACKGROUND: Laryngeal nodule and laryngeal polyp are the most common diseases that cause hoarseness and their incidences are increased currently. Since the invention of computerized voice analysis, it became possible to display voice quantitatively and visibly. MATERIALS AND METHODS: To evaluate the voice of 30 patients with laryngeal nodule and polyp before and after laryngomicrosurgery, the sound spectrogram of the Korean vowel /e/ were analyzed. RESULTS: 1) The valuable parameters for measuring the voice improvement were the range of fundamental frequency fluctuation, jitter and shimmer before and after surgery of laryngeal nodule and polyp. 2) On the first postoperative day, the change of the acoustic parameters of laryngeal nodule and polyp on postoperative showed statistically significant improvements. 3) The acoustic parameters of laryngeal nodule and polyp came within the normal range by the 7th postoperative day. 4) The extent of change in the acoustic parameters of laryngeal polyp was greater than in laryngeal nodule. CONCLUSION: We concluded that the valuable parameters for measuring the voice improvement were the range of fundamental frequency fluctuation, jitter and shimmer. The normalization of this parameter occurred at the first operative week.