Med Biol Eng Comput - Space-time network connectivity and cortical activations preceding spike wave discharges in human absence epilepsy: a MEG study.

Tópicos

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Resumo

To describe the spatial and temporal profiles of connectivity networks and sources preceding generalized spike-and-wave discharges (SWDs) in human absence epilepsy. Nonlinear associations of MEG signals and cluster indices obtained within the framework of graph theory were determined, while source localization in the frequency domain was performed in the low frequency bands with dynamic imaging of coherent sources. The results were projected on a three-dimensional surface rendering of the brain using a semi-realistic head model and MRI images obtained for each of the five patients studied. An increase in clustering and a decrease in path length preceding SWD onset and a rhythmic pattern of increasing and decreasing connectivity were seen during SWDs. Beamforming showed a consistent appearance of a low frequency frontal cortical source prior to the first generalized spikes. This source was preceded by a low frequency occipital source. The changes in the connectivity networks with the onset of SWDs suggest a pathologically predisposed state towards synchronous seizure networks with increasing connectivity from interictal to preictal and ictal state, while the occipital and frontal low frequency early preictal sources demonstrate that SWDs are not suddenly arising but gradually build up in a dynamic network.

Resumo Limpo

describ spatial tempor profil connect network sourc preced general spikeandwav discharg swds human absenc epilepsi nonlinear associ meg signal cluster indic obtain within framework graph theori determin sourc local frequenc domain perform low frequenc band dynam imag coher sourc result project threedimension surfac render brain use semirealist head model mri imag obtain five patient studi increas cluster decreas path length preced swd onset rhythmic pattern increas decreas connect seen swds beamform show consist appear low frequenc frontal cortic sourc prior first general spike sourc preced low frequenc occipit sourc chang connect network onset swds suggest patholog predispos state toward synchron seizur network increas connect interict preictal ictal state occipit frontal low frequenc earli preictal sourc demonstr swds sudden aris gradual build dynam network

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