Neuromonitoring and video-assisted thyroidectomy: a prospective, randomized case-control evaluation

Abstract
Introduction  This study evaluates the role of intraoperative neuromonitoring (IONM) in video-assisted thyroidectomy (VAT) with emphasis
given to the identification of recurrent laryngeal nerve (RLN) and external branch of superior laryngeal nerve (EBSLN).

Methods  The study was based on a prospectively randomized series comprising 72 standard VAT gasless approaches. In the control group
(N = 36), the laryngeal nerves were identified by 30° 5-mm endoscope magnification solely. The standard technique of the IONM
group (N = 36) consisted of localizing and monitoring EBSLN, both vagus and RLNs, before and after thyroid resection to prove nerve
integrity. Surgical outcomes were mean operative time, nerve representation, incision length, and morbidity.

Results  All procedures were performed successfully. There were no instances of equipment malfunction or interference. No permanent
complications occurred in either group. The incidences of temporary RLN injury were 2.7% (1 patient) and 8.3% (3 patients)
in the IONM and control group, respectively. The EBSLN was identified better in the IONM group: 83.6% versus 42% (p < 0.05). In the IONM group, a negative electromyography (EMG) response indicated an altered function of RLN and stage thyroidectomy
was scheduled.

Conclusions  This is the first VAT series with a standardized IONM technique. The technical feasibility and safety of IONM in selected
patients seem acceptable. Neuromonitoring during VAT is effective in providing identification and function of laryngeal nerves.
IONM enables surgeons to feel more comfortable with their approach to VAT. A reduction of rates for postoperative complications
could not be demonstrated in the present study. Larger series are needed for further evaluation.

Content Type Journal ArticleDOI 10.1007/s00464-008-0098-3Authors
Gianlorenzo Dionigi, Endocrine Surgery Research Center, University of Insubria Department of Surgical Sciences Via Guicciardini 21100 Varese ItalyLuigi Boni, Endocrine Surgery Research Center, University of Insubria Department of Surgical Sciences Via Guicciardini 21100 Varese ItalyFrancesca Rovera, Endocrine Surgery Research Center, University of Insubria Department of Surgical Sciences Via Guicciardini 21100 Varese ItalyAlessandro Bacuzzi, Endocrine Surgery Research Center, University of Insubria Department of Surgical Sciences Via Guicciardini 21100 Varese ItalyRenzo Dionigi, Endocrine Surgery Research Center, University of Insubria Department of Surgical Sciences Via Guicciardini 21100 Varese Italy

Journal Surgical EndoscopyOnline ISSN 1432-2218Print ISSN 0930-2794 (Source: Surgical Endoscopy)  MedWorm Sponsored Message: Find out how you can get your message across here by sponsoring this MedWorm news feed.