AUTHOR=Rodriguez Montesdeoca Isaura , Ramos de Miguel Angel , González Juan Carlos Falcon , Barreiro Silvia Borkoski , Pérez Fernández Nicolás , Vanspauwen Robby , Ramos-Macias Angel 

TITLE=Differences in Vestibular-Evoked Myogenic Potential Responses by Using Cochlear Implant and Otolith Organ Direct Stimulation

JOURNAL=Frontiers in Neurology

VOLUME=Volume 12 - 2021

YEAR=2021

URL=https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2021.663803

DOI=10.3389/fneur.2021.663803

ISSN=1664-2295

ABSTRACT=Objective
Several studies have demonstrated the possibility to obtain vestibular potential elicited with electrical stimulation from cochlear and vestibular implant. The objective of this study is to analyze the vestibular evoked myogenic potential(VEMPS) responses obtained from a group of patients implanted with cochlear and vestibular implant.
Material Method
We compared two groups: in the first group 4 cochlear implant (CI) with acoustic cVEMPS response before CI surgery, and in the second group 3 patients with no bilateral cVEMPS responses preoperatively and bilateral vestibular dysfunction which received unilateral Vestibular implant (Cochleo-Vestibular electric stimulation) were included in this study.
We analyze the electrically elicited cVEMPS in all patients after stimulation with cochlear and vestibular electrode array stimulation.
Results
We present the results obtained postoperatively in both groups. Presence of electric cVEMPS responses were observed in all patients with vestibular direct stimulation  with P1 and N1 latencies were in 11,33-13,6 and 18,3-21 ms. In CI patients, electric cVEMPS  were present only in one of the subjects with  cochlear implant cross stimulation  andP1 and N1 latencies were 9,67 and 16,33. In these patients, the responses present shorter latencies than acoustically.
Conclusions
Electrically cVEMPS can be present after cochlear and vestibular stimulation, and suggest stimulation of vestibular elements, although clinical effect must be further studied.