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Neuromagnetic high-frequency oscillations correlate with seizure severity in absence epilepsy.
- Source :
-
Clinical Neurophysiology . Feb2016, Vol. 127 Issue 2, p1120-1129. 10p. - Publication Year :
- 2016
-
Abstract
- Objective This study quantified the clinical correlation of interictal and ictal neuromagnetic activities from low- to very-high-frequency ranges in childhood absence epilepsy (CAE). Methods Twelve patients with clinically diagnosed drug-naïve CAE were studied using a 275-channel whole-head magnetoencephalography (MEG) system. MEG data were digitized at 6000 Hz and analyzed at both sensor and source levels with multi-frequency analyses. Results Neuromagnetic changes from interictal to ictal periods predominantly occurred in medial prefrontal cortex and parieto-occipito-temporal junction in absence seizures. The changes were statistically significant in low-frequency bands only (<30 Hz, p < 0.0001). There was a significant correlation between the source strength of ictal high-frequency oscillations (HFOs) in 200–1000 Hz and the number of daily seizures ( r = 0.734, p < 0.01). Conclusions CAE has focal neuromagnetic sources. The transition from interictal to ictal periods is associated with the elevation of low-frequency brain activities. The strength of HFOs reflects the severity of absence seizures. Significance Low- and high-frequency MEG signals reveal distinct brain activities in CAE. HFOs is a new biomarker for the study of absence seizures. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13882457
- Volume :
- 127
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Clinical Neurophysiology
- Publication Type :
- Academic Journal
- Accession number :
- 112367911
- Full Text :
- https://doi.org/10.1016/j.clinph.2015.08.016