Vestibular evoked myogenic potential: new perspectives in multiple sclerosis.
OBJECTIVE
To evaluate vestibular evoked myogenic potentials in patients with multiple sclerosis as method of diagnostic support.


METHODS
Case-control.


METHODS
We studied a group of normal individuals (n=15) and a Studied group (n=15) that comprised patients with diagnosis of multiple sclerosis. Both groups were submitted to vestibular evoked myogenic potential exam. In each ear it was applied 200 stimuli by clicks and repeated for 2 consecutive cycles with the purpose of evaluating reproducibility. The active electrode of surface was put on the superior S++ of sternocleidomastoid muscle and the reference electrode on the anterior border of the clavicle. The individuals were instructed to rotate theirs head to the opposite side to the stimulated ear.


RESULTS
Vestibular evoked myogenic potential responses were prompt, reproducible and biphasic. The latency of wave P1 and N2 and P1-N2 amplitude showed a higher value in the studied group when compared with the normal group. There was no significant difference when the ears were compared in P1 and N2 amplitude. We noticed that individuals with multiple sclerosis showed no response in 30% of the cases. In evaluating the individuals of the Studied group with otoneurology symptoms and compared with individuals without symptoms, it was observed that P1 and N2 latencies and P1-N2 amplitude were higher in symptomatic cases.


CONCLUSIONS
Vestibular evoked myogenic potential was considered a good method of diagnostic support of vestibulospinal tract in cases of multiple sclerosis.
Aidar
Renata Chade
RC
Instituto de Assistência Médica ao Servidor Estadual Francisco Morato de Oliveira, SP. reaidar@uol.com.br
Suzuki
Fábio A
FA
D000161:Acoustic Stimulation; D000328:Adult; D016022:Case-Control Studies; D016009:Chi-Square Distribution; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D009103:Multiple Sclerosis / Q000503:physiopathology*; D013116:Spinal Cord / Q000502:physiology; D014724:Vestibular Function Tests; D014726:Vestibular Nuclei / Q000502:physiology