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Ocular and cervical vestibular evoked myogenic potentials in response to bone-conducted vibration in patients with probable inferior vestibular neuritis

Published online by Cambridge University Press:  15 May 2012

L Manzari ,
A M Burgess  and
I S Curthoys
L Manzari
Affiliation:
MSA ENT Academy Center, Cassino, Italy
A M Burgess
Affiliation:
Vestibular Research Laboratory, School of Psychology, University of Sydney, New South Wales, Australia
I S Curthoys*
Affiliation:
Vestibular Research Laboratory, School of Psychology, University of Sydney, New South Wales, Australia
*
Address for correspondence: Dr Ian S Curthoys, Vestibular Research Laboratory, School of Psychology, A18, University of Sydney, Sydney, NSW, Australia 2006 Fax: +61 2 9036 5223 E-mail: ianc@psych.usyd.edu.au
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Abstract

Background and aims:

Previous evidence shows that the n10 component of the ocular vestibular evoked myogenic potential indicates utricular function, while the p13 component of the cervical vestibular evoked myogenic potential indicates saccular function. This study aimed to assess the possibility of differential utricular and saccular function testing in the clinic, and whether loss of saccular function affects utricular response.

Methods:

Following vibration conduction from the mid-forehead at the hairline, the ocular n10 component was recorded by surface electromyograph electrodes beneath both eyes, while the cervical p13–n23 component was recorded by surface electrodes over the tensed sternocleidomastoid muscles.

Results:

Fifty-nine patients were diagnosed with probable inferior vestibular neuritis, as their cervical p13–n23 component was asymmetrical (i.e. reduced or absent on the ipsilesional side), while their ocular n10 component was symmetrical (i.e. normal beneath the contralesional eye).

Conclusion:

The sense organ responsible for the cervical and the ocular vestibular evoked myogenic potentials cannot be the same, as one response was normal while the other was not. Reduced or absent saccular function has no detectable effect on the ocular n10 component. On vibration stimulation, the ocular n10 component indicates utricular function and the cervical p13–n23 component indicates saccular function.

Keywords

Vestibular Function TestsOtolithsVestibular Evoked Myogenic PotentialsVestibular NeuronitisSacculeUtriclePathophysiology
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 126 , Issue 7 , July 2012 , pp. 683 - 691
Copyright
Copyright © JLO (1984) Limited 2012

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