The Efficacy of Intraoperative Neuromonitoring during Robotic Thyroidectomy : A Prospective, Randomized Case-Control Evaluation

Background: This study evaluates the efficacy of intraoperative neuromonitoring (IONM) on voice performance in robotic thyroidectomy. Materials and Methods: The study was based on a prospective randomized series. Between June 2011 to September 2012, 50 patients with thyroid cancer who underwent robotic thyroidectomy were enrolled. The IONM and non-IONM groups consisted of 25 patients each. Voice Handicap Index (VHI), voice range profile (VRP), and laryngoscopy were used to assess voice function before surgery and at 2 weeks, 3 months, and 6 months after the operation. Results: No palsy was diagnosed by laryngoscopy in either group. VHI values were similar in both groups. In the IONM group, there was significantly earlier recovery in VRP minimum intensity compared with the non-IONM group. However, there were no differences of mean change of VRP maximum frequency and intensity or minimum frequency between the two groups. Conclusions: We found that IONM facilitated more rapid recovery of voice function, especially in VRP minimum intensity, during robotic thyroid surgery.