title: Outcome following surgery in patients with bitemporal interictal epileptiform patterns.
abstract: We reviewed outcome at least 1 year after temporal lobectomy in 44 patients with bitemporal, independent, interictal epileptiform patterns on EEG. All 44 underwent preoperative intracranial monitoring. Twenty-two (50%) were seizure-free, 14 (32%) had at a least 75% reduction in seizures, and eight (18%) had less than a 75% reduction in seizures. We analyzed age of seizure onset, duration of epilepsy, gender, side of operation, history and clinical findings, findings on MRI, results of intracranial EEG-video monitoring, presence or absence of lateralizing neuropsychological deficits, and pathology of resected tissue to identify factors associated with outcome. Three factors emerged as independently associated with a good outcome: concordance of MRI abnormality and side of operation (p = 0.01), history of febrile seizures (p = 0.04), and 100% lateralization of intracranially recorded ictal onsets to the side of operation (p = 0.05). A seizure-free outcome was much more likely to occur if more than one of these factors was present: with at least two factors co-existing, 83% (15/18) of patients were seizure-free, while only 35% (7/20) were seizure-free with a single factor present (p = 0.0009). Of the six patients without any of the three factors, none were seizure-free. We conclude that it is possible to predict reasonably which patients with bitemporal epileptiform abnormalities will have a good outcome after surgery.
authors.affiliation: Department of Neurology, University of Washington School of Medicine, Seattle, USA.
authors.forename: M D
authors.initials: MD
authors.lastname: Holmes
authors.forename: C B
authors.initials: CB
authors.lastname: Dodrill
authors.forename: G A
authors.initials: GA
authors.lastname: Ojemann
authors.forename: A J
authors.initials: AJ
authors.lastname: Wilensky
authors.forename: L M
authors.initials: LM
authors.lastname: Ojemann
mesh_terms: D000293:Adolescent; D000328:Adult; D004569:Electroencephalography; D004827:Epilepsy / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery*; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008499:Medical Records; D008875:Middle Aged; D003294:Seizures, Febrile / Q000150:complications; D013702:Temporal Lobe / Q000601:surgery; D016896:Treatment Outcome