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KMID : 1022420150070040077
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Phonetics and Speech Sciences
2015 Volume.7 No. 4 p.77 ~ p.83
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Acoustic Analysis of Voice Change According to Extent of Thyroidectomy
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Kang Young-Ae
Koo Bon-Seok
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Abstract
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Voice complication without the laryngeal nerve injury can occur after thyroidectomy. The purpose of this study is to investigate voice changes according to extent of thyroidectomy with acoustic analysis. Thirty-five female patients with papillary thyroid carcinoma took voice evaluation at before and 1 month, and 3 months after thyroidectomy. Acoustic analysis parameters were speaking fundamental frequency(SFF), min F0, max F0, dynamic range F0, jitter, shimmer, noise-to-harmonic ratio(NHR), and Cepstral prominence peak(CPP). Repeated-measured analysis of variance was applied. Time-related voice changes showed significant differences in all parameters except NHR. At 1 month after surgery, voice quality was worse and pitch was decreasing, but voice quality and pitch were improving at 3-month follow-up. Voice changes according to the extent of surgery were in SFF, max F0, and dynamic range F0. Time by surgery-related voice change existed only in min F0. The result showed that the severity of voice complication depended on the extend of thyroidectomy which had a negative impact on F0-related parameters. The deterioration of voice quality at 1 month after thyroidectomy may be affected by the loss of thyroid hormone in the blood. The descent of F0-related parameters may be impacted by laryngeal fixation of surgical site adhesion.
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KEYWORD
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extent of thyroidectomy, voice disorder, acoustic analysis, papillary thyroid carcinoma
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