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Related Concept Videos

Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...

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Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings
07:31

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Published on: May 7, 2020

Subcontinuous epileptiform activity after failed hippocampal radiosurgery.

Sylvain Rheims1, Adrien Didelot, Marc Guenot

  • 1Hospices Civils de Lyon, Department of Functional Neurology and Epileptology, Lyon, France.

Epilepsia
|June 15, 2011
PubMed
Summary
This summary is machine-generated.

Gamma-knife radiosurgery (GKS) for temporal lobe epilepsy (TLE) can cause persistent epileptiform activity in the hippocampus. This activity, potentially from radiation-induced changes, may explain treatment failure in some TLE patients.

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Area of Science:

  • Neurology
  • Neurosurgery
  • Epileptology

Background:

  • Gamma-knife radiosurgery (GKS) is effective for temporal lobe epilepsy (TLE), but its mechanism is unclear.
  • Subnecrotic radiation effects may contribute to GKS's antiepileptic action.
  • Understanding EEG activity post-GKS is crucial for mechanism elucidation and treatment failure analysis.

Purpose of the Study:

  • To investigate electroencephalography (EEG) activity in the hippocampus of patients previously treated with GKS for TLE.
  • To explore the relationship between GKS-induced brain changes and persistent epileptiform activity.
  • To gain insights into the reasons for GKS treatment failure in TLE.

Main Methods:

  • Stereotactic intracerebral EEG recordings were performed in two patients with disabling seizures after mesial temporal GKS.
  • Multiple electrodes were implanted within the epileptic temporal lobe, including mesial temporal structures.
  • Patients had a history of TLE with hippocampal atrophy, with specific etiologies noted.

Main Results:

  • EEG recordings revealed subcontinuous spiking and rhythmic discharges within GKS-treated mesial temporal structures.
  • This activity differed from typical mesial TLE abnormalities and suggested radiosurgery-induced brain changes.
  • Both patients underwent successful anterior temporal lobectomy with class I outcome, and pathology confirmed radiation effects.

Conclusions:

  • Mesial temporal structures treated with GKS can exhibit persistent epileptiform activity in non-responsive patients.
  • This persistent EEG activity likely reflects GKS-induced brain changes.
  • The precise relationship between this activity and GKS seizure outcome remains undetermined.