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The effect of electrode positions on multifocal visual evoked potential
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF OCULAR FUNDUS DISEASES
- Issue:
- 6
- DOI:
- 10.3760/j.issn:1005-1015.2004.06.004
- Key Word:
- 视觉/生理学;诱发电位,视觉
Abstract： 目的比较不同记录电极位置对多焦视诱发电位(mf-VEP)检查结果的影响.方法应用RETIscan多焦视诱发电位记录系统3.20对10例正常人进行检查.记录电极位置包括两组垂直通道和两组水平通道.垂直通道作用电极和参考电极分别置于枕骨隆凸上、下方各2.0 cm(Ch1)或枕骨隆凸上方3.0 cm、下方4.5 cm(Ch2);水平通道作用电极和参考电极分别置于枕骨隆凸右、左侧各2.0 cm(Ch3)或4.0 cm(Ch4).分别比较各通道记录的上半视野及下半视野mf-VEP的振幅之和有无显著性差异.结果各通道记录的上半视野及下半视野mf-VEP振幅之和的差异均有显著性的意义(F=20.273,P=0.000);且Ch2与Ch1、Ch3、Ch4两两之间的差异也有显著性的意义(P分别为0.000、0.000、0.001).对于沿水平中线分布的位点,Ch2记录的mf-VEP中振幅很小的各位点的振幅之和,与Ch3、Ch4记录的mf-VEP中相应位点的振幅之和的差异有显著性的意义(F=11.304,P=0.000);且Ch4与Ch2、Ch3两两之间的差异也有显著性的意义(P均＜0.05).结论与Ch1、Ch3和Ch4相比,Ch2可记录到更佳的mfVEP.水平通道可改善垂直通道对部分位点,尤其是沿水平中线分布位点的mf-VEP的引导,其中,Ch4对Ch2的改善作用较Ch3更为明显.
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