不同记录电极位置对多焦视诱发电位检查结果的影响

The effect of electrode positions on multifocal visual evoked potential

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 3.2 0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=2 0 .2 73,P=0 .0 0 0 ) ;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 .0 0 0、0 .0 0 0、0 .0 0 1)。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=11.30 4 ,P=0 .0 0 0 ) ;且 Ch4与 Ch2、Ch3两两之间的差异也有显著性的意义 (P均 <0 .0 5 )。 结论 与 Ch1、Ch3和 Ch4相比 ,Ch2可记录到更佳的 mf-VEP。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?

Objective To compare the effect of electrode positions o n multifocal visual evoked potential(mf-VEP). Methods Ten healt hy individuals were tested with RETIscan multifocal VEP system 3.20, each indiv idual was tested with four electrode positions: the active and reference electro de were placed 2.0 cm above and below the inion in Ch1;3.0 cm above and 4.5 cm below the inion in Ch2;2.0 cm on both right and left side of the inion in C h3 and 4.0 cm on both right and left side of the inion in Ch4. The summed ampli tudes of hemifield mf-VEP were analyzed and compared according to different ele ctrode positions. Results The difference among summed amplitud es of the upper or lower hemifield mf-VEP recorded with Ch1、Ch2、Ch3 and Ch4 w as statistically significant;and the difference between Ch2 and the other chann els was statistically significant too. The difference among summed amplitudes of the horizontal sites whose amplitudes were small when recorded with Ch2 and sum med amplitudes of the corresponding sites recorded with Ch3 and Ch4 were statist ically significant;and the difference between Ch4 and the other channels was st atistically significant too. Conclusions compared to Ch1、Ch3 and Ch4, Ch2 can make a better recording of mf-VEP. As for some sites, especi ally those along horizontal line, horizontal electrodes could improve the amplit udes of mf-VEP recorded with vertical electrodes,and Ch4 could do better to im prove the mf-VEP recorded with Ch2 than Ch3.