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Involvement of brain structures in childhood epilepsy with centrotemporal spikes

Ito, Yuji Maki, Yuki Okai, Yu Kidokoro, Hiroyuki Bagarinao, Epifanio Takeuchi, Tomoya Ohno, Atsuko Nakata, Tomohiko Ishihara, Naoko Okumura, Akihisa Yamamoto, Hiroyuki Maesawa, Satoshi Natsume, Jun 名古屋大学

2022.01

概要

Background
We aimed to investigate electroencephalography (EEG)-functional magnetic resonance imaging (fMRI) findings to elucidate the interictal epileptiform discharge (IED)-related functional alterations in deep brain structures as well as the neocortex in childhood epilepsy with centrotemporal spikes (CECTS).

Methods
Ten children with CECTS (median age; 8.2 years) referred to our hospital within a year of onset were eligible for inclusion. They underwent EEG-fMRI recording during sleep. In addition, longitudinal evaluations, including medical examinations, intelligence tests, and questionnaires about developmental disabilities, were performed. The initial evaluation was performed at the same time as the EEG-fMRI, and the second evaluation was performed over 2 years after the initial evaluation.

Results
Three children were unable to maintain sleep during the EEG-fMRI recording, and the remaining seven children were eligible for further assessment. All patients showed unilateral-dominant centrotemporal spikes during scans. One patient had only positive hemodynamic responses, while the others had both positive and negative hemodynamic responses. All patients showed IED-related hemodynamic responses in the bilateral neocortex. For deep brain structures, IED-related hemodynamic responses were observed in the cingulate gyrus (n=4), basal ganglia (n=3), thalamus (n=2), and default mode network (n=1). Seizure frequencies at the second evaluation were infrequent or absent, and the longitudinal results of intelligence tests and questionnaires were within normal ranges.

Conclusions
We demonstrated that IEDs affect broad brain areas, including deep brain structures such as cingulate gyrus, basal ganglia, and thalamus. Deep brain structures may play an important role in the pathophysiology of CECTS.

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