Source Localization of Subclinical Rhythmic EEG Discharge of Adult Using Magnetoencephalography
Thandar Aung1, Hiroatsu Murakami2, Richard Burgess2
1Epilepsy Center, OSF healthcare Illinois neurological institute, Peoria, IL, USA.
Summary
Subclinical rhythmic EEG discharge of adult (SREDA) is a rare EEG event. Magnetoencephalography (MEG) revealed asynchronous activity in the temporo-perisylvian and parietal regions, aiding in avoiding misdiagnosis.
Area of Science:
- Neuroscience
- Electroencephalography
- Magnetoencephalography
Background:
- Subclinical rhythmic EEG discharge of adult (SREDA) is a rare, benign EEG phenomenon.
- No prior studies have analyzed SREDA using magnetoencephalography (MEG).
Purpose of the Study:
- To report MEG source localization of SREDA in two patients.
- To investigate the neurophysiological mechanisms underlying SREDA.
Main Methods:
- MEG-EEG recordings from two SREDA patients were analyzed.
- Single equivalent current dipole model with sequential dipole analysis was employed.
Main Results:
- SREDA discharges showed asynchronous activity between hemispheres.
- Localization to posterior temporo-perisylvian and lateral parietal regions.
- MEG revealed subtle waveform changes despite alarming EEG appearance.
Conclusions:
- MEG suggests neurophysiological mechanisms in posterior supra/infra perisylvian regions.
- MEG waveforms for SREDA were subtle, contrasting with EEG.
- MEG offers advantages in assessing benign SREDA and preventing misdiagnosis.
