Fernández-Bouzas A, Harmony T, Marosi E, Fernández T, Silva J, Rodríguez M, Bernal J, Reyes A, Casián G
ENEP Iztacala Universidad Nacional Autónoma de México, México DF, Mexico.
Electroencephalogr Clin Neurophysiol. 1997 Apr;102(4):279-85. doi: 10.1016/s0013-4694(96)96049-6.
In previous papers we have proposed that in patients with space-occupying lesions, delta power was related with the volume of the lesion and theta power with the volume of the edema. In this report we analyze the evolution of 10 patients with space-occupying lesions in whom we measured the volume of the lesion and of the edema before and after treatment that produced changes in these volumes. EEGs were recorded in the leads of the 10-20 system referenced to linked earlobes. Delta and theta powers were calculated for voltage and current source densities (CSD) and compared with age-norms to compute conventional Z-maps. These maps provide probability statements about the deviation of observed values from the norm. Rank correlations between the change in the volume of the lesion before and after treatment and the change in Z-values before and after treatment were significant only in the delta band. However, rank correlations between the change in the volume of the edema and the change in EEG Z-values were only significant in the theta band. These correlations were higher for CSD than for voltage estimates. We also observed that the site of the lesion and of the edema was better represented by CSD maps than by voltage maps. These results are also in agreement with our previous reports, in which we observed more precise localization of brain lesions by CSD than by voltage estimates.
在之前的论文中我们提出，对于患有占位性病变的患者，δ波功率与病变体积相关，而θ波功率与水肿体积相关。在本报告中，我们分析了10例占位性病变患者的病情演变，在这些患者中，我们测量了治疗前后病变和水肿的体积，治疗导致了这些体积的变化。脑电图记录于参考双侧耳垂的10-20系统导联。计算了电压和电流源密度（CSD）的δ波和θ波功率，并与年龄标准进行比较以计算传统的Z图。这些图提供了关于观测值与标准值偏差的概率陈述。治疗前后病变体积变化与治疗前后Z值变化之间的秩相关仅在δ波段显著。然而，水肿体积变化与脑电图Z值变化之间的秩相关仅在θ波段显著。这些相关性对于CSD来说高于电压估计值。我们还观察到，与电压图相比，CSD图能更好地显示病变和水肿的位置。这些结果也与我们之前的报告一致，在之前的报告中我们观察到，与电压估计相比，CSD能更精确地定位脑病变。
