Abstract
Objective — to analyse restoration of vocal function and features of the laryngoscopy picture in patients with paresis and paralysis of the larynx after thyroid surgery.
 Materials and methods. A prospective single-center investigation involved results of examinations of 132 patients with laryngeal motility disorders after thyroid surgery aged 18 to 70 years (the mean age 41.5 ± 1.4) years, from them 27 men (20.5 %) and 105 women (79.5 %). The diagnosis of laryngeal motility and voice quality disorders was performed by an otolaryngologist using indirect laryngoscopy, videolaryngoscopy and spectral analysis of the voice to determine the following indicators: maximum phonation time (MPT), fundamental frequency (FF), harmonic/noise ratio (HNR), Jitter, Shimmer and questionnaire of subjective self-assessment of voice quality (Voice Handicap Index, VHI — 30), a modified version by B.Jacobcon.
 Results. Restoration of vocal cords (VC) motility (laryngeal paresis) was observed in 123 (93.2 %) patients within 6 months after thyroid surgery, in 9 (6.8 %) patient’s laryngeal motility was not restored (laryngeal paralysis) with in a year after surgery. When assessing the voice in patients with laryngeal paresis after 6 months and laryngeal paralysis after 12 months, indices of voice acoustic analysis significantly improved in both groups compared to the early postoperative period, especially in patients with laryngeal paresis, but significantly differed in comparison to preoperative parameters.
 Conclusions. Method of voice spectral analysis has a significant diagnostic value; it allows to objectify the degree of voice disorders after thyroid surgery and their subsequent monitoring during treatment and rehabilitation. When restoring laryngeal motility, parameters of voice do not always restore completely, which indicates presence of relevant complaints and requires further examinations and administration of appropriate treatment.
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