title: Video-EEG monitoring in patients with hippocampal atrophy.
abstract: OBJECTIVE
  To analyze the value of ictal EEG recordings in patients with unilateral magnetic resonance imaging (MRI)-identified hippocampal atrophy and concordant interictal epileptiform discharges (IEDs).
  
  
  METHODS
  The ictal EEG patterns in 84 patients with pharmaco resistant epilepsy undergoing an anterior temporal lobectomy between 1992 and 1995 were reviewed. The concordance between the ictal EEG and MRI and the IEDs was examined.
  
  
  RESULTS
  Two-hundred-and-thirty seizures (76.4%) were concordant and 11 seizures (3.7%) were discordant with the atrophic temporal lobe. Sixty seizures (19.9%) were indeterminate in localization. Sixty-three of the 69 patients (91.3%) with confirmatory and 14 of the 15 patients (93%) with non-confirmatory ictal EEG recordings, respectively, experienced an excellent operative outcome (P=0.629, Fisher's exact test).
  
  
  CONCLUSIONS
  Patients with unilateral hippocampal atrophy and concordant IEDs are excellent surgical candidates even when video-EEG monitoring shows discordant or non-localizing seizures.
authors.affiliation: Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.
authors.forename: D M
authors.initials: DM
authors.lastname: Cambier
authors.forename: G D
authors.initials: GD
authors.lastname: Cascino
authors.forename: E L
authors.initials: EL
authors.lastname: So
authors.forename: W R
authors.initials: WR
authors.lastname: Marsh
mesh_terms: D000293:Adolescent; D000328:Adult; D001284:Atrophy / Q000503:physiopathology; D002648:Child; D004569:Electroencephalography / Q000379:methods*; D004828:Epilepsies, Partial / Q000503:physiopathology*; D006624:Hippocampus / Q000503:physiopathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D014741:Video Recording / Q000379:methods*