Espectroscopia por ressonância magnética de prótons em epilepsia mioclônica juvenil sugere o comprometimento de uma rede neuronal específica

Espectroscopia por ressonância magnética de prótons em epilepsia mioclônica juvenil sugere o comprometimento de uma rede neuronal específica

Alternative title Proton magnetic resonance spectroscopy study of juvenile myoclonic epilepsy patients suggests involvement of a specific neuronal network
Author Lin, Katia Autor UNIFESP Google Scholar
Carrete Junior, Henrique Autor UNIFESP Google Scholar
Lin, Jaime Autor UNIFESP Google Scholar
Peruchi, M.m. Autor UNIFESP Google Scholar
Araujo Filho, Gerardo Maria de Autor UNIFESP Google Scholar
Pascalicchio, T.f. Autor UNIFESP Google Scholar
Guaranha, Mirian Salvadori Bittar Autor UNIFESP Google Scholar
Guilhoto, Laura Maria de Figueiredo Ferreira Autor UNIFESP Google Scholar
Yacubian, Elza Márcia Targas Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract OBJECTIVES: The neuroanatomical basis and the neurochemical abnormalities that underlay juvenile myoclonic epilepsy (JME) are not fully defined. While the thalamus plays a central role in synchronization of widespread regions of the cerebral cortex during a seizure, emerging evidence suggests that all cortical neurons may not be homogeneously involved. The purpose of this study was to investigate the cerebral metabolic differences between patients with JME and normal controls. METHODS: All patients had a JME diagnosis based on seizure history and semiology, EEG recording, normal magnetic resonance neuroimaging (MRI) and video-EEG. Forty JME patients (JME-P) were submitted to 1.5 T MRI proton spectroscopy (1H-MRS), multi-voxel with PRESS sequence (TR/TE = 1500/30 ms) over the following locations: prefrontal cortex (PC), frontal cortex (FC), thalamus, basal nuclei, posterior cingulate gyrus (PCG), insular, parietal and occipital cortices. We determined ratios for integral values of N-acetyl aspartate (NAA) and glutamine-glutamate (GLX) over creatine-phosphocreatine (Cr). The control group (CTL) consisted of 20 age and sex-matched healthy volunteers. RESULTS: Group analysis demonstrated a tendency for lower NAA/Cr ratio of JME-P compared to CTL predominantly on FC, PC, thalamus and occipital cortex. When compared to CTL, JME-P had a statistically significant difference in GLX/Cr on FC, PC, insula, basal nuclei, PCG and on thalamus. When evaluating the relationship among the various components of this epileptic network among JME-P, the strongest correlation occurred between thalamus and PC. Also, we found a significant negative correlation between NAA/Cr and duration of epilepsy. CONCLUSION: Reductions in NAA may represent loss or injury of neurons and/or axons, as well as metabolic dysfunction while glutamate is considered to be an excitatory neurotransmitter in the brain which is involved in the pathogenesis of epileptogenic seizures.
Keywords Juvenile myoclonic epilepsy
magnetic resonance spectroscopy
magnetic resonance imaging
Epilepsia mioclônica juvenil
espectroscopia por ressonância magnética
imagem por ressonância magnética
Language Portuguese
Date 2008-09-01
Published in Journal of Epilepsy and Clinical Neurophysiology. Liga Brasileira de Epilepsia (LBE), v. 14, n. 3, p. 99-100, 2008.
ISSN 1676-2649 (Sherpa/Romeo)
Publisher Liga Brasileira de Epilepsia (LBE)
Extent 99-100
Access rights Open access Open Access
Type Article
SciELO ID S1676-26492008000300003 (statistics in SciELO)

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