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Epilepsy Res. 2013 Aug;105(3):405-9. doi: 10.1016/j.eplepsyres.2013.02.017. Epub 2013 Mar 25.

Quantifying the contribution of video in combined video-magnetoencephalographic ictal recordings of epilepsy patients.

Author information

  • 1Department of Biomedical Engineering and Computational Science, Aalto University School of Science, P.O. Box 12200, FI-00076 AALTO, Espoo, Finland. andrey.zhdanov@aalto.fi.

Abstract

INTRODUCTION:

Magnetoencephalography (MEG) measures magnetic fields generated by neuronal currents. MEG is complementary to EEG. Considerable body of evidence indicates that ictal MEG recordings can provide useful information for pre-surgical evaluation of epilepsy patients alongside the more established long-term ictal video-EEG. Ictal MEG is recorded in some epilepsy surgery centers. However, a wider adoption of ictal MEG is hampered by lack of tools for synchronized video-MEG recording similar to those of video-EEG.

METHODS:

We have augmented MEG with a synchronized behavioral video-recording system. To estimate its additional value in ictal recordings, we retrospectively analyzed recordings of 10 epilepsy patients with and without the video.

RESULTS:

In six patients out of ten, adding the video substantially changed the resulting interpretations. In all six cases the effect was considerable: the number of detected seizures changed by more than 50%.

CONCLUSIONS:

Synchronized video and audio recording capabilities are important for effective ictal MEG recordings of epilepsy patients.

KEYWORDS:

EEG; Epilepsy; MEG; Video

[PubMed - indexed for MEDLINE]
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