Assessing acute middle cerebral artery ischemic stroke by quantitative electric tomography.
Clin EEG Neurosci
; 35(3): 116-24, 2004 Jul.
Article
em En
| MEDLINE
| ID: mdl-15259617
ABSTRACT
This paper focuses on the application of quantitative electric tomography (qEEGT) to map changes in EEG generators for detection of early signs of ischemia in patients with acute middle cerebral artery stroke. Thirty-two patients were studied with the diagnosis of acute ischemic stroke of the left middle cerebral artery territory, within the first 24 hours of their clinical evolution. Variable Resolution Electrical Tomography was used for estimating EEG source generators. High resolution source Z-spectra and 3- dimensional images of Z values for all the sources at each frequency were obtained for all cases. To estimate statistically significant increments and decrements of brain electric activity within the frequency spectra, the t-Student vs. Zero test was performed. A significant increment of delta activity was observed on the affected vascular territory, and a more extensive increment of theta activity was detected. A significant alpha decrement was found in the parieto-occipital region of the affected cerebral hemisphere (left), and in the medial and posterior region of the right hemisphere. These findings suggest that qEEGT Z delta images are probably related to the main ischemic core within the affected arterial territory; penumbra, diaschisis, edema, might explain those observed theta and alpha abnormalities. It was concluded that qEEGT is useful for the detection of early signs of ischemia in acute ischemic stroke.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ritmo Teta
/
Imageamento por Ressonância Magnética
/
Infarto da Artéria Cerebral Média
/
Ritmo alfa
Tipo de estudo:
Diagnostic_studies
/
Screening_studies
Limite:
Adult
/
Aged
/
Aged80
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Clin EEG Neurosci
Assunto da revista:
CEREBRO
/
NEUROLOGIA
Ano de publicação:
2004
Tipo de documento:
Article
País de afiliação:
Cuba