Abstract
Aim. Ocular Evoked Myogenic Potential (oVEMP) are short latency potentials evoked by higher acoustic stimulation. In this study, we aimed at comparing the click, 500 Hz mixed modulated, and 500 Hz short duration tone burst stimuli using oVEMP. Material. Click, 500 Hz mixed modulated and 500 Hz short duration tone burst stimuli were used for the study. Method. Conventional sampling and conveneint study design were used. Sixty healthy subjects underwent contralateral oVEMP testing maintaining 30 degrees upward gaze. Single channel electrode montage was applied to record oVEMP response. Results. On statistical analysis the three stimuli evoked equal response rates (100%), and when latency of n1 and p1 and peak-peak amplitude were compared, the click evoked showed significantly early latency and lower peak-peak amplitude than the 500 Hz stimuli. Five hundred Hz stimuli did not show significant difference in latency and peak-peak amplitude of n1-p1. Discussion. Thus, 500 Hz stimuli can evoke better latency and peak-peak amplitude. oVEMP has good clinical significance in diagnosing subjects with vestibular dysfunction. To add to the sensitivity of the oVEMP test, 500 Hz stimuli may also be used as it can evoke better oVEMP responses in clinical population with good morphology.
Highlights
Human auditory system consists of otolith, namely, saccule and utricle
The cervical vestibular evoked myogenic potential assesses the descending vestibular pathway as ipsilateral sacculocollic reflex; [1] reported the ocular vestibular evoked myogenic potential to evaluate the ascending vestibular pathway as crossed vestibulo-ocular reflex. They premised that binaural acoustic stimulation can elicit oVEMPs as effectively as monaural acoustic stimulation does
500 Hz mixed modulated 500 Hz short duration tone burst latency is better than 500 Hz short duration tone burst and 500 Hz mixed modulated stimuli in latency
Summary
Human auditory system consists of otolith, namely, saccule and utricle. Vestibular evoked myogenic potential (VEMP) is one of such tests which checks function of otolith organ. These are electromyogenic short latency electrical impulses recorded using high acoustic stimuli. The cervical vestibular evoked myogenic potential (cVEMP) assesses the descending vestibular pathway as ipsilateral sacculocollic reflex; [1] reported the ocular vestibular evoked myogenic potential (oVEMP) to evaluate the ascending vestibular pathway as crossed vestibulo-ocular reflex. They premised that binaural acoustic stimulation can elicit oVEMPs as effectively as monaural acoustic stimulation does. The former method requires more muscular effort than the later since continuous upward gazing is necessary during oVEMP testing
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