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The electroencephalograms of 50 parkinsonian patients with no convulsive antecedents were studied. EEG abnormalities were found in 20 patients (40% of the cases). The incidence of abnormal records was larger in the bilateral parkinsonian syndrome than in the unilateral one (52% and 25%, respectively). Paroxysmal abnormalities characterized mainly by bursts of theta waves were the most frequent ones (65% of the cases). Sharp activity found in the EEG patterns of three patients is emphasized. Alterations of the base rhythm were recorded in 30% of the abnormal EEG cases. The patient's age doesn't seem to have an important role in the genesis of the electroencephalographic abnormalities.Foram estudados os eletrencefalogramas de 50 pacientes parkinsonianos livres de qualquer antecedente convulsivo, sendo registrados traçados anormais em 40% dos casos. A incidência de traçados anormais foi maior na síndrome parkinsoniana bilateral do que na unilateral (52% e 25%, respectivamente). Entre as anormalidades assinaladas foram as paroxísticas as mais freqüentes (65% dos casos), caracterizando-se predominantemente por surtos de ondas teta. O registro de anormalidades paroxísticas do tipo irritativo encontrado em três casos é salientado. Alterações da atividade de base foram assinaladas em 35% dos pacientes. A idade dos pacientes não parece ter tido importante papel na gênese das anormalidades eletrencefalográficas

Eletrencefalograma na síndrome parkinsoniana