Effects of repetition rate of bone-conducted vibration on ocular and cervical vestibular-evoked myogenic potentials

Chih-Ming Chang, Po-Wen Cheng, Shou-Jen Wang, Yi-Ho Young
Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology 2010, 121 (12): 2121-7

OBJECTIVE: This study applied bone-conducted vibration (BCV) stimuli at various repetition rates to investigate the effects of repetition rate on both ocular and cervical vestibular-evoked myogenic potentials (oVEMPs and cVEMPs).

METHODS: Twenty-five healthy subjects underwent oVEMP tests in BCV mode at repetition rates of 1, 5, 10, 20, 30 and 40Hz. The optimal repetition rates (5, 10 and 20Hz) for oVEMPs were also adopted to elicit cVEMPs, and 20Hz stimuli were further evaluated in pathological ears.

RESULTS: At repetition rates of 1, 5, 10, 20, 30 and 40Hz, the prevalence of clear oVEMPs were 100% in groups of 5, 10 and 20Hz, with no significant differences in the mean nI latency, but the mean nI-pI amplitude of the 20Hz group showed significantly larger. For the BCV-cVEMPs, 5, 10 and 20Hz stimuli yielded similar information. Clinically, the BCV mode at 20Hz stimuli was also appropriate for evaluating VEMPs in ears of vestibular schwannoma.

CONCLUSIONS: The BCV mode at a repetition rate of 20Hz is recommended for the mass detection of VEMPs.

SIGNIFICANCE: Eliciting VEMPs in BCV mode using 20Hz stimuli takes a short time and may trigger a high prevalence with large amplitude.

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