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Related Concept Videos

Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

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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.
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Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
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Related Experiment Video

Updated: Dec 19, 2025

Author Spotlight: Advancing Pediatric Epilepsy Surgery in Children Through Novel Biomarkers and Enhanced Localization
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Perisylvian vulnerability to postencephalitic epilepsy.

Claude Steriade1, Lara Jehi2, Balu Krishnan2

  • 1Epilepsy Center, Cleveland Clinic Foundation, Cleveland, OH, USA; New York University Langone Comprehensive Epilepsy Center, New York University, New York, NY, USA.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|June 7, 2020
PubMed
Summary

Postencephalitic epilepsy involves unique brain network patterns, particularly in the perisylvian regions, which may impact surgical outcomes. Understanding these networks is crucial for treating drug-resistant epilepsy post-encephalitis.

Keywords:
EncephalitisEpilepsySEEG

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Area of Science:

  • Neurology
  • Epileptology
  • Neuroscience

Background:

  • Postencephalitic epilepsy frequently presents as drug-resistant epilepsy, necessitating surgical evaluation.
  • Characterizing the specific epileptogenic networks in these patients is vital for optimizing surgical strategies.

Purpose of the Study:

  • To investigate if a history of encephalitis is associated with distinct epileptogenic networks in patients with drug-resistant epilepsy undergoing stereotactic EEG (SEEG).

Main Methods:

  • A retrospective cohort study compared 17 patients with postencephalitic epilepsy to 17 matched controls with drug-resistant epilepsy without encephalitis history.
  • Stereotactic EEG (SEEG) recordings were analyzed to identify seizure onset patterns and network organization.

Main Results:

  • 65% of postencephalitic epilepsy patients exhibited independent bilateral seizures.
  • Unique ictal patterns involving perisylvian regions, with a "patchwork" organization, were identified in the encephalitis group (p < 0.05).
  • Fewer postencephalitic epilepsy patients achieved favorable surgical outcomes (Engel I) compared to controls (p=0.0048).

Conclusions:

  • Postencephalitic epilepsies involve anteromesial temporal and perisylvian networks, often bilaterally.
  • The unique perisylvian ictal patterns in the encephalitis group suggest a selective vulnerability and may explain poorer surgical outcomes.