title: Brain Source Imaging in Preclinical Rat Models of Focal Epilepsy using High-Resolution EEG Recordings.
abstract: Electroencephalogram (EEG) has been traditionally used to determine which brain regions are the most likely candidates for resection in patients with focal epilepsy. This methodology relies on the assumption that seizures originate from the same regions of the brain from which interictal epileptiform discharges (IEDs) emerge. Preclinical models are very useful to find correlates between IED locations and the actual regions underlying seizure initiation in focal epilepsy. Rats have been commonly used in preclinical studies of epilepsy; hence, there exist a large variety of models for focal epilepsy in this particular species. However, it is challenging to record multichannel EEG and to perform brain source imaging in such a small animal. To overcome this issue, we combine a patented-technology to obtain 32-channel EEG recordings from rodents and an MRI probabilistic atlas for brain anatomical structures in Wistar rats to perform brain source imaging. In this video, we introduce the procedures to acquire multichannel EEG from Wistar rats with focal cortical dysplasia, and describe the steps both to define the volume conductor model from the MRI atlas and to uniquely determine the IEDs. Finally, we validate the whole methodology by obtaining brain source images of IEDs and compare them with those obtained at different time frames during the seizure onset.
authors.affiliation: Biomedical Engineering, Florida International University.
authors.forename: Jihye
authors.initials: J
authors.lastname: Bae
authors.affiliation: Biomedical Engineering, Florida International University.
authors.forename: Abhay
authors.initials: A
authors.lastname: Deshmukh
authors.affiliation: Biomedical Engineering, Florida International University.
authors.forename: Yinchen
authors.initials: Y
authors.lastname: Song
authors.affiliation: Biomedical Engineering, Florida International University; jrieradi@fiu.edu.
authors.forename: Jorge
authors.initials: J
authors.lastname: Riera
mesh_terms: D000818:Animals; D001921:Brain / Q000503:physiopathology*; D004195:Disease Models, Animal; D004569:Electroencephalography / Q000379:methods*; D004828:Epilepsies, Partial / Q000503:physiopathology*; D051381:Rats; D017208:Rats, Wistar