Mallinson Arthur, Kuijpers Anouk, Longridge Neil
Neuro-otology Unit, Vancouver General Hospital, Vancouver, Canada.
J Int Adv Otol. 2018 Apr;14(1):72-76. doi: 10.5152/iao.2018.3841. Epub 2018 Feb 20.
Ocular vestibular-evoked myogenic potentials (OVEMPs) in our hands provide us with reproducible and consistent results; however, it has been shown that the OVEMP amplitude decreases with increased stimulus duration. The exact number of stimuli for OVEMP recording is not consistent among the published papers describing this test. We aimed to determine the number of stimuli needed to produce a satisfactory OVEMP response and the consequences of a more prolonged stimulation to the OVEMP response.
We retrospectively analyzed 50 OVEMP patient recordings and found that the average number of sweeps carried out was 26. We carried out three different OVEMP recordings using our standard protocol of (1) a "standard" OVEMP protocol, in which we record until the OVEMP wave becomes obvious; (2) an OVEMP recording using our average of 26 sweeps; and (3) an OVEMP recording with twice as many sweeps.
OVEMP latencies did not change when using different number of sweeps; however, the amplitudes showed a significant decrease with an increasing number of sweeps.
OVEMPs can be completed in a satisfactory manner with a much lower number of stimuli than those usually carried out. Reducing the stimulus number reduces the time taken for the test, minimizes the cochlear insult while not reducing the valuable information obtained, and maximizes the amplitude of the stimulus, possibly increasing the accuracy of measuring interaural amplitudes and helping to measure asymmetry.
我们所做的眼前庭诱发肌源性电位（OVEMPs）测试能提供可重复且一致的结果；然而，已有研究表明，随着刺激持续时间增加，OVEMP波幅会降低。在描述该测试的已发表论文中，用于记录OVEMP的确切刺激次数并不一致。我们旨在确定产生满意的OVEMP反应所需的刺激次数，以及延长刺激对OVEMP反应的影响。
我们回顾性分析了50例OVEMP患者的记录，发现平均扫描次数为26次。我们使用标准方案进行了三种不同的OVEMP记录：（1）“标准”OVEMP方案，即记录到OVEMP波明显出现；（2）使用平均26次扫描的OVEMP记录；（3）扫描次数加倍的OVEMP记录。
使用不同扫描次数时，OVEMP潜伏期未发生变化；然而，波幅随着扫描次数增加而显著降低。
与通常进行的刺激次数相比，以少得多的刺激次数就能令人满意地完成OVEMPs测试。减少刺激次数可缩短测试时间，将耳蜗损伤降至最低，同时不减少所获得的有价值信息，还能使刺激波幅最大化，可能提高测量双耳间波幅的准确性并有助于测量不对称性。
