Lupton B A, Wong P K, Bencivenga R, Hill A
Dept. of Paediatrics, University of British Columbia, Canada.
Doc Ophthalmol. 1990 Nov;76(1):73-80. doi: 10.1007/BF00140500.
We examined how changes in electrode position affected the visual evoked potential in 74 high-risk newborns using a multiple electrode technique. The variation in the visual evoked potential across the occiput was documented. Visual evoked potentials that were visible at one occipital electrode position were absent at a different electrode position in 21 of 87 recordings (24%). Changes of greater than 20 msec between electrodes in latency of waves P1 or N2 occurred in 34% and 29% of recordings, respectively. The amplitude of response varied by a factor of 2.36 between mid occipital and lateral occipital electrodes. The results demonstrated that large changes in morphologic characteristics, latency, and amplitude in the visual evoked potential of the newborn result from small changes in the position of recording electrodes. These findings underscored the importance of electrode position and accurate electrode placement. Our observations also indicated that recordings from a single electrode are inadequate in providing an accurate representation of the neonatal visual evoked potential.
我们使用多电极技术，研究了电极位置的变化如何影响74例高危新生儿的视觉诱发电位。记录了枕部视觉诱发电位的变化情况。在87次记录中，有21次（24%）在一个枕部电极位置可见的视觉诱发电位，在另一个电极位置却消失了。P1波或N2波潜伏期在电极间变化大于20毫秒的情况分别出现在34%和29%的记录中。枕中部和枕外侧电极之间反应幅度相差2.36倍。结果表明，记录电极位置的微小变化会导致新生儿视觉诱发电位的形态特征、潜伏期和幅度发生很大变化。这些发现强调了电极位置和准确放置电极的重要性。我们的观察结果还表明，单电极记录不足以准确呈现新生儿视觉诱发电位。
