title: Neural networks underlying parietal lobe seizures: a quantified study from intracerebral recordings.
abstract: In this study we have quantified the "epileptogenicity" of several brain regions in seizures originating in the posterior parietal cortex in 17 patients investigated by intracerebral recordings using stereotactic EEG (SEEG). Epileptogenicity of brain structures was quantified according to the "epileptogenicity index" (EI), a way to quantify rapid discharges at seizure onset. Seven patients had maximal epileptogenicity in the superior parietal lobule-BA area 7 (Gr1), 2 patients in the superior parietal lobule-area 5 (Gr2), 4 patients in inferior parietal lobule (Gr3) and 4 in the opercular region (Gr4). A large majority of patients (15/17 (88%)) reported to have at least one aura during the course of their disease. Somato-sensory manifestations were reported in the four groups. Vestibular disturbance was observed mainly in seizures from the superior parietal lobule (Gr1 and 2). Ipsilateral version was the most frequent objective manifestation (64%). Hyperkinetic behaviour (motor agitation) was found to be frequent, observed in 4/17 cases (23%) and observed in seizures from inferior parietal regions. In conclusion, the electrophysiological organization and the clinical manifestations of PLS are various and complex. The subjective manifestations are frequent and often suggestive, therefore must be actively sought.
authors.affiliation: INSERM, U751, Laboratoire de Neurophysiologie et Neuropsychologie, Marseille, F-13005, France. fabrice.bartolomei@ap-hm.fr
authors.forename: Fabrice
authors.initials: F
authors.lastname: Bartolomei
authors.forename: Martine
authors.initials: M
authors.lastname: Gavaret
authors.forename: Russell
authors.initials: R
authors.lastname: Hewett
authors.forename: Luc
authors.initials: L
authors.lastname: Valton
authors.forename: Sandrine
authors.initials: S
authors.lastname: Aubert
authors.forename: Jean
authors.initials: J
authors.lastname: Régis
authors.forename: Fabrice
authors.initials: F
authors.lastname: Wendling
authors.forename: Patrick
authors.initials: P
authors.lastname: Chauvel
mesh_terms: D000293:Adolescent; D000328:Adult; D000465:Algorithms; D002648:Child; D004569:Electroencephalography; D004827:Epilepsy / Q000503:physiopathology* / Q000523:psychology / Q000601:surgery; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009415:Nerve Net / Q000503:physiopathology*; D010296:Parietal Lobe / Q000503:physiopathology* / Q000601:surgery; D011595:Psychomotor Agitation / Q000150:complications / Q000523:psychology; D012640:Seizures / Q000503:physiopathology* / Q000523:psychology / Q000601:surgery; D014474:Unconsciousness / Q000150:complications; D015837:Vestibular Diseases / Q000209:etiology; D055815:Young Adult