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Related Concept Videos

Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

361
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...
361
Seizures: Classification01:13

Seizures: Classification

676
Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
676

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Related Experiment Video

Updated: Oct 15, 2025

Induction and Clinical Scoring of Chronic-Relapsing Experimental Autoimmune Encephalomyelitis
26:48

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Seizures in autoimmune encephalitis: specific features based on a systematic comparative study.

Louis Cousyn1, Virginie Lambrecq1, Marion Houot2

  • 1AP-HP, Department of Neurology, Epilepsy Unit, Pitié-Salpêtrière Hospital, Paris, France, Paris Brain Institute (Inserm, CNRS, Sorbonne Université), Paris, France, Center of Reference for Rare epilepsies, Pitié-Salpêtrière Hospital, Paris, France.

Epileptic Disorders : International Epilepsy Journal with Videotape
|October 27, 2021
PubMed
Summary

Specific seizure symptoms and EEG patterns can help identify autoimmune encephalitis (AE) subtypes early. This aids diagnosis before antibody test results are available, improving patient care for AE and Rasmussen's encephalitis (RE).

Keywords:
anti-neuronal antibodiesautoimmune diseaseselectroencephalographyepilepsy

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Area of Science:

  • Neurology
  • Epileptology
  • Immunology

Background:

  • Autoimmune encephalitis (AE) encompasses a spectrum of inflammatory brain disorders.
  • Seizures are a common and often early manifestation of AE.
  • Distinguishing AE subtypes is crucial for targeted treatment and prognosis.

Purpose of the Study:

  • To delineate specific seizure semiology and electroencephalogram (EEG) features differentiating AE subtypes.
  • To enhance early diagnostic capabilities for AE, particularly in the acute phase.

Main Methods:

  • Systematic review of seizure semiology and EEG recordings from AE patients.
  • Analysis of patients managed in a tertiary epilepsy referral center and neuro-ICU.
  • Post hoc comparative analysis of characteristics across different AE subtypes.

Main Results:

  • 66 patients with anti-neuronal antibody-mediated AE or Rasmussen's encephalitis (RE) were analyzed.
  • Distinct semiological features were identified: early tonic-clonic seizures in anti-NMDAR AE, mesial temporal lobe seizures in anti-GAD AE, somatosensory seizures in RE.
  • EEG findings differentiating subtypes included generalized rhythmic delta activity for anti-NMDAR AE and temporal epileptiform activity for anti-GAD AE. A novel EEG pattern associated with mesial temporal inflammation was observed.

Conclusions:

  • Specific clinical seizure presentations and EEG patterns can guide the diagnosis of AE subtypes.
  • These findings are particularly valuable for early diagnosis before definitive antibody test results.
  • The study highlights the utility of EEG in identifying inflammatory mesial temporal involvement.