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Arquivos de Neuro-Psiquiatria

Print version ISSN 0004-282X

Abstract

SANDMANN, Marcos C.; PIANA, Edson R.; SOUSA, Daniel S.  and  BITTENCOURT, Paulo R. M. de. Digital EEG with brain mapping in Alzheimer's dementia and Parkinson's disease: a prospective controlled study. Arq. Neuro-Psiquiatr. [online]. 1996, vol.54, n.1, pp.50-56. ISSN 0004-282X.  https://doi.org/10.1590/S0004-282X1996000100009.

In order to evaluate the EEG activity during wakefulness in senile dementia of the Alzheimer type (AD) and Parkinson's disease (PD), a prospective controlled study was performed. We compared 6 AD and 11 PD patients with a control group of 12 patients with mild to moderate major chronic depression (DSM-III-R 1987). The median of the frequencies and the power of the posterior dominant activity was obtained in the three groups using spectral analysis. The posterior activity had a frequency of 8.79±0.52 (mean±sd) in the contrc group, 6.65+0.80 (mean+sd) in the AD group and 7.69+1.39 (mean±sd) in the PD group. The experimental hypothesis that patients with AD and PD differ from controls in relation to the background activity (defined a abnormal <8) was confirmed by the chi square test (p=0.0l) and the t test showed that the mean of the frequency of the posterior power was significantly lower in AD (p=0.01) and PD (p=0.05) patients, compared with the controls. The results indicate that this abnormality could be correlated with the degree of cortical damage and natural history of these disorders.

Keywords : electroencephalography; brain mapping; dementia; Parkinson's disease; Alzheimer's disease; depression.

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