Prospective electromyographic evaluation of functional postthyroidectomy voice and swallowing symptoms

Celestino Pio Lombardi, Lucia D'Alatri, Carmela De Crea, Marco Raffaelli, Maria Raffaella Marchese, Daria Maccora, Mauro Lo Monaco

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

BACKGROUND: Voice and swallowing symptoms following thyroidectomy in the absence of any demonstration of laryngeal nerves injury are usually considered a functional outcome of uncomplicated operations, mainly related to scar formation and emotional reaction. They could be related to unapparent laryngeal nerve or cricothyroid (CT) muscle injuries detectable only by laryngeal electromyography (LEMG). We correlated such symptoms with LEMG patterns. METHODS: A total of 33 consenting patients undergoing total thyroidectomy (TT) were enrolled. Video-strobolaryngoscopy (VSL), acoustic voice analysis (AVA), and maximum phonation time (MPT) were performed preoperatively and 3 months postoperatively. Subjective evaluation of voice (Voice Impairment Score, or VIS) and swallowing (Swallowing Impairment Score, or SIS) were obtained preoperatively and 1 and 3 months postoperatively. At 1 month postoperatively LEMG was performed examining thyroarytenoid (TA) and CT muscles to evaluate the inferior laryngeal nerve (ILN) and the external branch of the superior laryngeal nerve (EBSLN), respectively. RESULTS: One patient experienced transient vocal cord palsy and was excluded. The remaining 32 patients completed the postoperative evaluation. No significant difference was found between preoperative and postoperative AVA and MPT parameters. Mean VIS was significantly worse than preoperatively 1 and 3 months after TT. No significant difference was found between preoperative and postoperative SIS. LEMG evaluation of TA muscle showed decreased voluntary activity and spontaneous fibrillation potentials in one patient. LEMG of the CT muscle did not reveal any sign of EBSLN injury. CONCLUSIONS: Patients frequently complain of subjective symptoms early after TT. LEMG demonstrated the absence of subclinical laryngeal nerve injury in all but one patient, confirming their functional nature.
Original languageEnglish
Pages (from-to)1354-1360
Number of pages7
JournalWorld Journal of Surgery
Volume36
DOIs
Publication statusPublished - 2012

Keywords

  • Complications
  • Functional post-thyroidectomy syndrome
  • Thyroidectomy

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