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Normal values for cervical and ocular vestibular-evoked myogenic potentials using EMG scaling: effect of body
Navid Shahnaz1, Eytan A David2
1School of Audiology and Speech Sciences, University of British Columbia, Vancouver, Canada.
Background:
The clinical utility of cervical and ocular vestibular-evoked myogenic potential (cVEMP and oVEMP) is limited by variability of testing protocols and a dearth of normative data using contemporary methods for amplitude scaling.
Aims/Objectives:
To investigate the effect of body position and electrode montage on VEMP responses and to establish normative values.
Material And Methods:
This is a repeated measures study of 44 healthy young adult subjects (22 men and 22 women).
Results:
The highest response rate (99%) for cVEMP was achieved in the supine position with the head elevated and turned. For oVEMP, the highest response rate (90%) was achieved using nasal alar electrode montage with the subject in a sitting position. Scaled peak-to-peak amplitude was higher in males than in females for both cVEMP and oVEMP.
Conclusion:
Normative data for 44 young healthy adults was successfully collected for two body positions for cVEMP and two head positions and two electrode montages for oVEMP.
Significance:
Our findings describe VEMP protocols that efficiently detect VEMP responses, and we provide normative VEMP response data for young healthy subjects. We describe a potential difference in response between males and females, which may be clinically important.
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