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Intraictal Activation in the Neocortex: A Marker of the Epileptogenic Region
Author(s) -
Jayakar P.,
Duchowny M.,
Alvarez L.,
Resnick T.
Publication year - 1994
Publication title -
epilepsia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.687
H-Index - 191
eISSN - 1528-1167
pISSN - 0013-9580
DOI - 10.1111/j.1528-1157.1994.tb02467.x
Subject(s) - ictal , neocortex , magnetic resonance imaging , epilepsy , medicine , lesion , neuroscience , psychology , anesthesia , pathology , radiology
Summary: During the course of a seizure, subdural recordings often show secondary areas which develop in‐dependent electrographic sequences that may outlast the primary seizure sequence. We reviewed the subdural data on 8 patients with intraictal secondarily activated foci (ISF). In 6 patients, ISFs were documented to be capable of generating independent seizures; ISF seizures occurred during the initial subdural monitoring period in 3, but became ictal generators only after excision of the primary focus in the other 3. Prominent interictal abnormalities were observed at the ISFs in 5 of 8 patients. The ISF in 1 patient correlated with the structural lesion on magnetic resonance imaging (MRI) scan. We believe that ISFs have significant epileptogenicity and should be re‐sected when possible.