[Spectral analysis of the human EEG in acutely developing foci of irritation at the diencephalic and brain stem levels].
The dynamic study of EEG spectra and coherence in 52 patients in early period after tumor ablation at the diencephalic (27 patients) and brainstem (25 patients) levels with favourable (24 patients) and lethal (28 patients) outcomes revealed a dependence of their changes on the reversibility or irreversibility of pathological irritation of these brain levels. At regressively developing foci and retained compensatory mechanisms characteristic changes of EEG relations were seen in the central cortical areas, i. e. in cortical projection zone of the nonspecific thalamic pathways. The changes observed consisted of EEG synchronization in the band of 7 cps and sharp coherence increase while changes of EEG correlations in other cortical areas were unsimilar. Gradual EEG normalization with alpha-rhythm restoration passed through the stage of sigma-rhythm and slow sleeplike waves which indicated the safety of brainstem-subcortical hypnogenic systems. In patients with destructive foci at the diencephalic and brainstem levels, i. e. under conditions of brain functioning similar to "cerveau isolé" and "encephale isolé",--a general coherence decrease and EEG synchronization in the band of 5 cps, or generalized slow, monomorphic oscillations were observed.
D001932:Brain Neoplasms / Q000601:surgery; D001933:Brain Stem / Q000502:physiology*; D002540:Cerebral Cortex / Q000502:physiology*; D003388:Cranial Fossa, Posterior; D003655:Decerebrate State / Q000503:physiopathology; D004027:Diencephalon / Q000502:physiology*; D004569:Electroencephalography; D006801:Humans
Spektral'nyi analiz EEG cheloveka pri ostro razvivaiushchikhsia ochagakh razdrazheniia na urovne dientsefal'nykh i stvolovykh otdelov mozga.