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Vestibular evoked myogenic potentials

D D Robertson¹, D J Ireland

¹Department of Otolaryngology, University of Manitoba Faculty of Medicine and Health Sciences Centre, Winnipeg.

The Journal of Otolaryngology

|February 1, 1995

Summary

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Vestibular evoked myogenic potentials (VEMP) show promise for assessing vestibular function. This pilot study found VEMP testing useful in identifying vestibular loss, correlating well with caloric testing.

Area of Science:

Neurology
Otolaryngology
Neuroscience

Background:

Vestibular evoked myogenic potentials (VEMP) are increasingly used to assess vestibular function.
Previous studies have shown VEMP's utility in detecting vestibular abnormalities, but further re-evaluation is warranted.

Purpose of the Study:

To re-evaluate the clinical benefits of vestibular evoked myogenic potentials (VEMP) in patients with vestibular disorders.
To assess the correlation between VEMP results and established diagnostic methods like caloric testing.

Main Methods:

A pilot study involving 7 normal subjects and 20 patients with unilateral peripheral vestibular disorders.
Electromyograms (EMG) were recorded from sternomastoid muscles in response to auditory click stimuli.
Analysis of EMG potentials (p14-n21) and comparison with caloric testing results.

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Main Results:

Control subjects showed equivalent VEMP potentials ipsilateral and contralateral to stimuli.
In patients with vestibular disorders, VEMP potentials were preserved with hearing loss but absent with vestibular loss.
A strong correlation was observed between VEMP p14-n21 potentials and caloric testing outcomes.

Conclusions:

VEMP testing appears valuable for assessing intact vestibulocollic pathways.
The saccule is suspected as the origin of the VEMP response.
VEMP may serve as a useful diagnostic tool in clinical vestibular assessment.