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Comparison of Acoustic Properties of Voice Quality Before and After Thyroplasty Medialization

After vagus nerve was recessed, due to the resulting gap and lack of adduction voice quality was poor, the timbre was completely unharmonic and phonation type whispery. Six years after the surgery thyroplasty type I (medialization thyroplasty) was conducted. Before and after the procedure the following data were collected: subjective assessment of voice quality, (VHI), phonetic, auditory assessment, and acoustic analysis including: F0 measures, tone and intensity perturbations, HNR during phonation, and long term average spectrum (LTASS). After thyroplasty the subjective assessment was that there is no voice quality disorder. Phonetic protocols provided information about complete comprehensibility, good speech quality, optimal communication, middle tone, normal loudness, no supralaryngeal modifications, modal phonation, adequate breathing and rhythmicity. Acoustic parameters indicated significant differences in jitter (p>0.0001), shimmer (p=0.001), dispersion F0 (p=0.002) and HNR (p=0.005). Regarding timbre, during reading and spontaneous productions showed more balanced LTASS. Interdisciplinary approach motivates patient because higher voice quality improves life quality.

voice quality, medialization thyroplasty, VHI questionnaire, phonetic assessment, acoustic analysis

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