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01.11.2015 | Original Paper

Quantification of Interictal Neuromagnetic Activity in Absence Epilepsy with Accumulated Source Imaging

verfasst von: Jing Xiang, Jeffrey R. Tenney, Abraham M. Korman, Kimberly Leiken, Douglas F. Rose, Elana Harris, Weihong Yuan, Paul S. Horn, Katherine Holland, David W. Loring, Tracy A. Glauser

Erschienen in: Brain Topography | Ausgabe 6/2015

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Abstract

Aberrant brain activity in childhood absence epilepsy (CAE) during seizures has been well recognized as synchronous 3 Hz spike-and-wave discharges on electroencephalography. However, brain activity from low- to very high-frequency ranges in subjects with CAE between seizures (interictal) has rarely been studied. Using a high-sampling rate magnetoencephalography (MEG) system, we studied ten subjects with clinically diagnosed but untreated CAE in comparison with age- and gender-matched controls. MEG data were recorded from all subjects during the resting state. MEG sources were assessed with accumulated source imaging, a new method optimized for localizing and quantifying spontaneous brain activity. MEG data were analyzed in nine frequency bands: delta (1–4 Hz), theta (4–8 Hz), alpha (8–12 Hz), beta (12–30 Hz), low-gamma (30–55 Hz), high-gamma (65–90 Hz), ripple (90–200 Hz), high-frequency oscillation (HFO, 200–1,000 Hz), and very high-frequency oscillation (VHFO, 1,000–2,000 Hz). MEG source imaging revealed that subjects with CAE had higher odds of interictal brain activity in 200–1,000 and 1,000–2,000 Hz in the parieto-occipito-temporal junction and the medial frontal cortices as compared with controls. The strength of the interictal brain activity in these regions was significantly elevated in the frequency bands of 90–200, 200–1,000 and 1,000–2,000 Hz for subjects with CAE as compared with controls. The results indicate that CAE has significantly aberrant brain activity between seizures that can be noninvasively detected. The measurements of high-frequency neuromagnetic oscillations may open a new window for investigating the cerebral mechanisms of interictal abnormalities in CAE.

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Titel: Quantification of Interictal Neuromagnetic Activity in Absence Epilepsy with Accumulated Source Imaging
verfasst von: Jing Xiang
Jeffrey R. Tenney
Abraham M. Korman
Kimberly Leiken
Douglas F. Rose
Elana Harris
Weihong Yuan
Paul S. Horn
Katherine Holland
David W. Loring
Tracy A. Glauser
Publikationsdatum: 01.11.2015
Verlag: Springer US
Erschienen in: Brain Topography / Ausgabe 6/2015
Print ISSN: 0896-0267
Elektronische ISSN: 1573-6792
DOI: https://doi.org/10.1007/s10548-014-0411-5

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