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Abstract
Background: Characteristics of vestibular evoked myogenic potentials (VEMPs) depend on stimulus conditions.
Objective: To determine the optimal stimulus conditions for cervical and ocular VEMPs.
Methods: Participants were 23 healthy subjects. We compared air-conducted cervical and ocular VEMPs elicited by various tone-burst conditions (frequencies 500–1,000 Hz, rise/fall times 1–2 ms, and plateau times 0–6 ms) with an intensity of 105 dB normal hearing level. Effects of simultaneous contralateral masking noise on VEMPs were also evaluated.
Results: The largest cervical VEMP amplitudes were elicited by 500–750 Hz and 2–6 ms plateau time-tone-bursts, and the largest ocular VEMP amplitudes by 750 Hz and 2–4 ms plateau time-tone-bursts. Repeatability of the latency was better at 1 ms than at 2 ms rise/fall time in both VEMPs. In both VEMPs, masking noise reduced amplitude, and in ocular VEMP, amplitudes were significantly larger at the left ear stimulation than the right.
Conclusion: Optimal tone-burst stimulation for both VEMPs seemed to be 500–750 Hz frequency and 1/2/1 ms rise/plateau/fall time without contralateral masking noise. Ocular VEMP amplitudes from left ear stimulation were originally larger than those from right ear stimulation.
Chinese abstract
背景：前庭诱发肌源性电位（VEMP）的特征取决于刺激条件。
目的：确定颈部和眼部VEMP的最佳刺激条件。
方法：参与者为23名健康受试者。我们比较了由各种音调突发条件（频率500-1,000Hz；上升/下降时间1-2ms；持平时间0-6ms）引起的空气传导的颈部和眼部VEMP, 其强度为105dB正常听力水平。还评估了同时对侧掩蔽噪声对VEMP的影响。
结果：最大的颈部VEMP振幅由500-750 Hz和2-6 ms的持平时间-音调突发引发, 最大的眼部VEMP振幅由750 Hz和2-4 ms持平时间-音调突发引发。对于两种VEMP, 延迟的可重复性在1ms时比在2ms上升/下降时更好。对于两种VEMP, 掩蔽噪声降低了幅度；对于眼部VEMP, 左耳刺激的振幅显著大于右耳。
结论：对于两个VEMP的最佳音调突发刺激似乎是500-750Hz频率和1/2/1ms上升/持平/下降时间, 无对侧掩蔽噪声。来自左耳刺激的眼部VEMP振幅最初大于来自右耳刺激的振幅。
Disclosure statement
No potential conflict of interest was reported by the authors.