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.
Introduction: Motion Sickness (MS) is one among the most common distressing ailment accompanied with both actual and perceived motion.
Regardless of its commonality, very little is known about the underlying pathophysiology. Several tests have proved the involvement of vestibular
system in motion sickness. However, there is dearth of knowledge on the expected ndings of Subjective Vestibular Tests (SVT) in individuals with
MS. Aim: To compare the SVT ndings in individuals with and without MS. Methodology:Recruited participants were divided into two groups.
The group Aconsisted of participants experiencing symptoms of motion sickness and group B consisted of normal controls. To full the aim of the
study, subjects were introduced to SVT such as Romberg's Test, Fukuda Stepping Test (FST), Gait Test, Subjective Visual Vertical (SVV) and
Subjective Visual Horizontal (SVH). Results and Discussion:The results of the study depicted a good contribution of tests in identifying the
affected vestibular system in individuals with MS. Further, about 55% abnormal test ndings in eyes open position for SVV test and 50% for SVH
test were obtained. Similarly, eyes closed position yielded abnormal test ndings of 35% and 20% in FST and Gait test respectively. Finally, upon
comparison between the test ndings, FST has been situated superior over other SVTs.The recruited tests are known to detect comparatively
weaker labyrinth (not necessarily side of lesion) by the observed deviation from the start point in eyes open and closed position. The test results
obtained beyond the normative values inherit the presence of otolithic end organ dysfunction in the vestibular system. Therefore, the individuals
with MS nd it difcult to maintain the expected vertical and horizontal tilt.
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