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Ictal EEG modifications in temporal lobe epilepsy.

Veronica Pelliccia1, Roberto Mai2, Stefano Francione2

  • 1"Claudio Munari" Epilepsy Surgery Centre, Niguarda Hospital, Milan, Neurology Unit, Department of Neuroscience, University of Pisa, Pisa, Italy.

Epileptic Disorders : International Epilepsy Journal with Videotape
|October 31, 2013
PubMed
Summary
This summary is machine-generated.

Low-voltage fast activity on scalp electroencephalogram (EEG) is the primary indicator of the epileptogenic zone in most temporal lobe epilepsy (TLE) patients. This finding challenges the traditional view, highlighting fast activity as a crucial diagnostic marker for TLE surgery.

Keywords:
epilepsy surgeryepileptogenic zoneictal scalp-EEGlow-voltage fast activitytemporal lobe epilepsyvideo-EEG recording

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Area of Science:

  • Neurology
  • Clinical Neurophysiology
  • Epileptology

Background:

  • Temporal lobe epilepsy (TLE) is the most prevalent form of adult epilepsy, often resistant to medication and suitable for surgical intervention.
  • Presurgical diagnosis of the epileptogenic zone in TLE typically relies on clinical data, neuroimaging, and scalp electroencephalogram (EEG) findings.
  • Conventional understanding suggests that rhythmic delta or theta activity characterizes ictal EEG in TLE.

Purpose of the Study:

  • To investigate the predominant ictal EEG patterns in patients with temporal lobe epilepsy during presurgical evaluation.
  • To determine the prevalence and significance of low-voltage fast activity as an initial EEG pattern in TLE.
  • To re-evaluate the diagnostic utility of different EEG patterns for identifying the epileptogenic zone in TLE.

Main Methods:

  • Retrospective review of ictal scalp-EEG data from 111 seizures in 47 patients with TLE undergoing video-EEG monitoring.
  • Analysis of initial and subsequent EEG patterns during seizures.
  • Correlation of EEG findings with established knowledge from experimental models and intracranial EEG recordings.

Main Results:

  • Low-voltage fast activity, flattening, or fast activity was observed as the initial EEG pattern in 74.4% (35 out of 47) of patients.
  • Rhythmic delta or theta activity, when present, typically followed the initial fast activity.
  • Low-voltage fast activity (or similar patterns) is a common and significant initial ictal EEG finding in TLE.

Conclusions:

  • Low-voltage fast activity, flattening, or fast activity represents the main ictal EEG pattern in the majority of TLE patients.
  • This fast activity pattern is identifiable in scalp-EEG recordings and is crucial for presurgical localization of the epileptogenic zone.
  • The findings challenge the traditional emphasis on rhythmic delta/theta activity, positioning fast activity as a key electrophysiological hallmark in TLE.