Cervical and ocular vestibular evoked myogenic potentials in determining nerve division involvement in patients with a tumor located in the internal auditory canal.

Autor: Zwierzyńska K; Department of Otorhinolaryngology, Head and Neck Surgery, Medical University of Warsaw, ul. Banacha 1a, 02-097 Warszawa (Warsaw), Poland., Lachowska M; Department of Otorhinolaryngology, Head and Neck Surgery, Medical University of Warsaw, ul. Banacha 1a, 02-097 Warszawa (Warsaw), Poland. Electronic address: mlachowska@wum.edu.pl., Sokołowski J; Department of Otorhinolaryngology, Head and Neck Surgery, Medical University of Warsaw, ul. Banacha 1a, 02-097 Warszawa (Warsaw), Poland., Niemczyk K; Department of Otorhinolaryngology, Head and Neck Surgery, Medical University of Warsaw, ul. Banacha 1a, 02-097 Warszawa (Warsaw), Poland.
Jazyk: angličtina
Zdroj: Auris, nasus, larynx [Auris Nasus Larynx] 2021 Jun; Vol. 48 (3), pp. 383-393. Date of Electronic Publication: 2020 Sep 22.
DOI: 10.1016/j.anl.2020.09.006
Abstrakt: Objectives: The study aimed at the analysis of the parameters of acoustic cervical and ocular vestibular evoked myogenic potentials (AC-cVEMP and AC-oVEMP) response in patients with a confirmed tumor located in the internal auditory canal. It also aimed to assess to what degree a combination of these tests may be of benefit in the preoperative indication of the affected nerve division via preoperative determination whether the tumor originated from the superior or inferior division of the vestibular nerve, both divisions, or if it originated from a different nerve in the internal auditory canal.
Methods: The study group included 50 patients. Preoperative MRI scans were used to measure tumor diameter. AC-cVEMP and AC-oVEMP testing were performed before tumor resection. The surgeon was asked for a detailed description of the tumor origin.
Results: The corrected amplitude of cVEMP was significantly lower on the tumor side than on the non-affected side and in the control group. The corrected Asymmetry Ratio (AR) of cVEMPs in patients with the tumor was significantly elevated above the reference values with the mean being 58.29% and the mean AR of oVEMPs in patients the tumor was 71.78% which made both results significantly higher than in the control group. Neither cVEMP nor oVEMP latency was significantly correlated with tumor size. Data obtained from cVEMP and oVEMP tests was an effective indicator of tumor origin in 74% of patients showing which division (or both divisions) of the VIII th nerve was affected in comparison with information obtained from the surgeon.
Conclusions: The combined use of AC-cVEMP and AC-oVEMP tests may be useful in surgical planning in patients the tumor located in the internal auditory canal, providing a highly probable determination of the division of the affected nerve. Such information is valuable for the surgeon as it offers additional knowledge about the tumor before the procedure. cVEMP and oVEMP results may not be used as the basis for the calculation of tumor size in patients.
Competing Interests: Declaration of Competing Interest The authors declare that there is no conflict of interest including any financial interest or financial support related to this manuscript to be disclosed. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
(Copyright © 2020. Published by Elsevier B.V.)
Databáze: MEDLINE
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