EEG spike source localization before and after surgery for temporal lobe epilepsy: a BOLD EEG-fMRI and independent component analysis study

Autor(es)

Sercheli, M. S. ^[1] ; Bilevicius, E. ^[2] ; Alessio, A. ^[2] ; Ozelo, H. ^[1] ; Pereira, F. R. S. ^[2] ; Rondina, J. M. ^[2] ; Cendes, F. ^[2] ; Covolan, R. J. M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Fac Ciencias Med, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Medical and Biological Research; v. 42, n. 6, p. 582-587, JUN 2009.
• Citações Web of Science: 3

Resumo

Simultaneous measurements of EEG-functional magnetic resonance imaging (fMRI) combine the high temporal resolution of EEG with the distinctive spatial resolution of fMRI. The purpose of this EEG-fMRI study was to search for hemodynamic responses (blood oxygen level-dependent - BOLD responses) associated with interictal activity in a case of right mesial temporal lobe epilepsy before and after a successful selective amygdalohippocampectomy. Therefore, the study found the epileptogenic source by this noninvasive imaging technique and compared the results after removing the atrophied hippocampus. Additionally, the present study investigated the effectiveness of two different ways of localizing epileptiform spike sources, i.e., BOLD contrast and independent component analysis dipole model, by comparing their respective outcomes to the resected epileptogenic region. Our findings suggested a right hippocampus induction of the large interictal activity in the left hemisphere. Although almost a quarter of the dipoles were found near the right hippocampus region, dipole modeling resulted in a widespread distribution, making EEG analysis too weak to precisely determine by itself the source localization even by a sophisticated method of analysis such as independent component analysis. On the other hand, the combined EEG-fMRI technique made it possible to highlight the epileptogenic foci quite efficiently. (AU)

• Processo FAPESP: 05/56578-4 - Centro multimodal de neuroimagens para estudos em epilepsia
• Beneficiário: Fernando Cendes
• Modalidade de apoio: Auxílio à Pesquisa - Programa CINAPCE - Temático
• Processo FAPESP: 04/15805-5 - Implementacao e desenvolvimento da tecnica de registros combinados de eeg e fmri para a aplicacao em estudos de epilepsia.
• Beneficiário: Mauricio da Silva Sercheli
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado