Raveendran Rajesh Kumar, Singh Niraj Kumar
Department of Audiology, All India Institute of Speech and Hearing, Manasagangothri, Mysore, Karnataka, India.
Ear Hear. 2024;45(1):227-238. doi: 10.1097/AUD.0000000000001419. Epub 2023 Aug 23.
Stimulus and recording parameters are pivotal for shaping the ocular vestibular-evoked myogenic potential (oVEMP). In the last decade, several attempts were made to identify the optimum electrode placement site to improve the oVEMP responses. A vast majority of these found larger response amplitudes for alternate electrode montages like belly-tendon (BT), chin-referenced (CR), and/or sternum-referenced montages than the clinically used infra-orbital montage. However, no study has yet compared all alternate electrode montages in a simultaneous recording paradigm to eliminate other confounding factors. Also, no study has compared all of them for their test-retest reliability, waveform morphology, and signal-to-noise ratio. Therefore, the decision on which among these electrode montages is best suited for oVEMP acquisition remains opaque. The present study aimed to investigate the effects of various electrode montages on oVEMP's response parameters and to determine the test-retest reliability of each of these in clinically healthy individuals using a simultaneous recording paradigm.
This study had a within-subject experimental design. Fifty-five young healthy adults (age range: 20-30 years) underwent contralateral oVEMP recording using infra-orbital, BT, chin-referenced, and sternum-referenced electrode montages simultaneously using a four-channel evoked potential system.
BT montage had a significantly shorter latency, larger amplitude, higher signal-to-noise ratio, and better morphology than other alternate montages ( p < 0.008). Further, all electrode montages of the current study showed fair/moderate to excellent test-retest reliability.
By virtue of producing significantly better response parameters than the other electrode montages, BT montage seems better suited to the recording of oVEMP than the known electrode montages thus far.
刺激和记录参数对于塑造眼前庭诱发肌源性电位（oVEMP）至关重要。在过去十年中，人们多次尝试确定最佳电极放置部位以改善oVEMP反应。其中绝大多数研究发现，与临床使用的眶下导联相比，腹肌腱（BT）、下颌参考（CR）和/或胸骨参考导联等交替电极导联的反应幅度更大。然而，尚无研究在同步记录范式中比较所有交替电极导联，以消除其他混杂因素。此外，也没有研究比较它们的重测信度、波形形态和信噪比。因此，关于这些电极导联中哪一种最适合采集oVEMP的决定仍然不明确。本研究旨在探讨各种电极导联对oVEMP反应参数的影响，并使用同步记录范式确定这些导联在临床健康个体中的重测信度。
本研究采用受试者内实验设计。55名年轻健康成年人（年龄范围：20 - 30岁）使用四通道诱发电位系统，同时采用眶下、BT、下颌参考和胸骨参考电极导联进行对侧oVEMP记录。
与其他交替导联相比，BT导联的潜伏期明显更短、幅度更大、信噪比更高且形态更好（p < 0.008）。此外，本研究中的所有电极导联均显示出良好/中等至优秀的重测信度。
由于BT导联产生的反应参数明显优于其他电极导联，因此与迄今为止已知的电极导联相比，BT导联似乎更适合记录oVEMP。
