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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.
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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Seizures: Classification01:13

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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:
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Epilepsy ll: Types01:22

Epilepsy ll: Types

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Recurrent seizures, stemming from abnormal electrical activity in the brain, are the defining characteristic of epilepsy, a chronic neurological condition. Because seizure features vary greatly, epilepsy is classified using two systems: by seizure type and by epilepsy syndromes. These classifications enable clinicians to describe seizure patterns and select suitable treatment strategies.I. Classification by Seizure Type1. Focal EpilepsyFocal epilepsy begins in one hemisphere of the brain.
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Encephalitis l: Introduction01:19

Encephalitis l: Introduction

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Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
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Seizures l: Introduction01:20

Seizures l: Introduction

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Understanding seizures and epilepsy relies on key definitions that help in recognizing, classifying, and managing these disorders. These definitions provide a framework for recognizing, classifying, and managing seizure disorders.DefinitionsA seizure is a sudden, abnormal burst of electrical activity in the brain that can cause changes in awareness, movement, sensation, or behavior, depending on the area involved. Epilepsy is a chronic condition characterized by recurrent, unprovoked seizures,...
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Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

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Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
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Related Experiment Video

Updated: Apr 19, 2026

Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale
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Postencephalitic epilepsy: clinical characteristics and predictors.

Tarun D Singh1, Jennifer E Fugate, Sara E Hocker

  • 1Department of Neurology, Mayo Clinic, Rochester, Minnesota, U.S.A.

Epilepsia
|December 20, 2014
PubMed
Summary

Seizures during acute encephalitis hospitalization and abnormal brain MRI are strong predictors of developing postencephalitic epilepsy (PE). Etiology and EEG findings did not predict PE development in adult patients.

Keywords:
Acute encephalitisAutoimmunePredictorsSeizuresViral

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Area of Science:

  • Neurology
  • Epileptology
  • Infectious Diseases

Background:

  • Acute encephalitis can lead to long-term neurological sequelae, including epilepsy.
  • Postencephalitic epilepsy (PE) significantly impacts patient quality of life and requires understanding of its predictors.
  • Identifying risk factors for PE is crucial for early intervention and management strategies.

Purpose of the Study:

  • To investigate the etiologies, clinical features, outcomes, and predictors of postencephalitic epilepsy (PE) in a large cohort of adult patients.
  • To identify factors associated with the development of PE following acute encephalitis.

Main Methods:

  • Retrospective review of 198 adult patients diagnosed with acute encephalitis between 2000 and 2012.
  • Patients categorized based on the presence or absence of PE at last follow-up.
  • Multivariate logistic regression analysis employed to determine predictors of PE.

Main Results:

  • Viral (48%) and autoimmune (22%) infections were common etiologies of encephalitis.
  • Seizures occurred in 54.5% of autoimmune encephalitis cases during hospitalization.
  • Predictors of PE included generalized seizures (p=0.03), focal seizures (p≤0.001), and FLAIR/T2 MRI abnormalities (p=0.003).

Conclusions:

  • Seizures during acute encephalitis hospitalization and abnormal brain MRI findings are significant predictors of developing PE.
  • Encephalitis etiology, focal neurological deficits, and interictal EEG abnormalities did not predict PE development.