Kawamura H, Umezawa Y, Amano K, Tanikawa T, Kawabatake H, Iwata Y, Taira T, Kitamura K
No Shinkei Geka. 1987 Apr;15(4):381-7.
EEG topography was investigated before and after surgical treatment in 4 patients with brain abscess aged from 5 to 13 years. According to the recording technique designed by Matsuoka and Ueno, the recorded EEG for each 5 seconds was analyzed to obtain square roots of power spectra for each band of delta (2-3.8 Hz), theta (4-7.8 Hz) and alpha (8-12.8 Hz) which were then added for the 60-seconds duration of each trial. After that, numerical matrix presenting the topographic distribution of spectral energy of each band were constructed and displayed as color images. In addition, the EEG topographies of brain abscesses were compared with the CT scans simultaneously obtained. In all of four cases before surgical treatment of the brain abscess, the location of the focal delta wave on the EEG topography was more closely related to the site of brain abscess comparing with its correlation between the location of the delta focus on the conventional EEG and the site of brain abscess. In contrast, as for the theta wave, there was no prominent correlation to the site of the brain abscess. In the early stage of 10-15 days after aspiration of the brain abscess, the most characteristic change of the EEG topography was an approximately 25% reduction of the maximum equivalent voltage of delta band with associated disappearance of the sharply located focal delta wave being noted before aspiration.(ABSTRACT TRUNCATED AT 250 WORDS)
对4例年龄在5至13岁的脑脓肿患者在手术治疗前后进行了脑电图地形图研究。根据松冈和上野设计的记录技术，对每5秒记录的脑电图进行分析，以获得δ波（2 - 3.8赫兹）、θ波（4 - 7.8赫兹）和α波（8 - 12.8赫兹）各频段功率谱的平方根，然后将其在每次试验的60秒时长内相加。之后，构建呈现各频段频谱能量地形分布的数值矩阵，并以彩色图像显示。此外，将脑脓肿的脑电图地形图与同时获得的CT扫描结果进行比较。在所有4例脑脓肿手术治疗前的病例中，脑电图地形图上局灶性δ波的位置与其在传统脑电图上δ波灶位置与脑脓肿部位的相关性相比，与脑脓肿部位的关系更为密切。相比之下，对于θ波，与脑脓肿部位没有明显的相关性。在脑脓肿抽吸后10 - 15天的早期，脑电图地形图最具特征性的变化是δ频段最大等效电压降低约25%，同时抽吸前明显定位的局灶性δ波消失。（摘要截取自250字）
