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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

2.2K
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 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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Antiepileptic Drugs: Sodium Channel Blockers01:08

Antiepileptic Drugs: Sodium Channel Blockers

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Antiepileptic drugs are specialized medications that prevent seizures in individuals diagnosed with epilepsy. These drugs primarily function by blocking the movement of sodium ions through channels in the neuronal membrane, inhibiting the repetitive firing of action potentials often associated with seizures.
Sodium channel blockers modulate ion channels, particularly voltage-gated sodium channels. They block only sodium ion movement.
Among the most commonly prescribed antiepileptic drugs are...
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Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein01:20

Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein

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Antiepileptic drugs, such as levetiracetam (Keppra) and brivaracetam (Briviact), have emerged as crucial tools in managing epilepsy. These medications exert their therapeutic effects by targeting the synaptic vesicle protein SV2A, a transmembrane glycoprotein primarily found in the brain.
SV2A is a transmembrane glycoprotein located predominantly in the brain, modulating the release of neurotransmitters for neuronal communication. Both levetiracetam and brivaracetam exhibit a high affinity for...
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Antiepileptic Drugs: Calcium Channel Blockers01:17

Antiepileptic Drugs: Calcium Channel Blockers

1.6K
Calcium channel blockers, a class of antiepileptic drugs, regulate the flow of calcium ions within neurons.
Calcium channel blockers exert their antiepileptic effects by targeting T-type calcium channels, which are integral to transmitting nerve signals in the central nervous system. These channels allow the passage of calcium ions, which are vital for neuronal communication. By inhibiting T-type calcium channels, calcium channel blockers effectively reduce the release of neurotransmitters and...
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Antiepileptic Drugs: GABAergic Pathway Potentiators01:18

Antiepileptic Drugs: GABAergic Pathway Potentiators

1.7K
γ-aminobutyric acid or GABA, plays a pivotal role as an inhibitory neurotransmitter in the brain. GABA pathway potentiators, also known as GABAergic drugs, are a class of pharmaceutical agents designed to enhance the functioning of the GABAergic system. These medications primarily treat epilepsy, a neurological disorder characterized by recurrent seizures.
The key GABA pathway potentiators used in epilepsy management are as follows.
Benzodiazepines are a well-known class of drugs used for...
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Related Experiment Video

Updated: Apr 6, 2026

Author Spotlight: Advancing Pediatric Epilepsy Surgery in Children Through Novel Biomarkers and Enhanced Localization
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Is the first seizure epilepsy--and when?

Nicholas Lawn1, Josephine Chan1, Judy Lee1

  • 1Department of Neurology, Royal Perth Hospital, Perth, Western Australia, Australia.

Epilepsia
|July 30, 2015
PubMed
Summary

The duration of seizure freedom significantly impacts epilepsy recurrence risk after a first seizure. Even with risk factors, short seizure freedom periods mean patients don't meet the new epilepsy definition.

Keywords:
Definition of epilepsyFirst seizurePrognosis

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Area of Science:

  • Neurology
  • Epilepsy Research
  • Clinical Neuroscience

Background:

  • Recent epilepsy definition includes a single unprovoked seizure if recurrence risk is ≥60% over 10 years.
  • This definition relies on risk after two seizures, not accounting for rapid decline in recurrence after first seizure.

Purpose of the Study:

  • Analyze long-term outcomes after a first-ever seizure.
  • Evaluate how seizure freedom duration affects recurrence likelihood.
  • Assess relevance to the new epilepsy definition.

Main Methods:

  • Prospective analysis of 798 adults with a first unprovoked seizure.
  • Assessed recurrence likelihood based on seizure freedom duration, etiology, EEG, and neuroimaging.
  • Data collected between 2000 and 2011.

Main Results:

  • Recurrence risk at 10 years was ≥60% with epileptiform EEG or neuroimaging abnormalities.
  • Recurrence risk is time-dependent; no group met the definition after ≤12 weeks seizure freedom.
  • Likelihood of a third seizure at 4 years was 68% and at 10 years was 85% after a second seizure.

Conclusions:

  • Seizure freedom duration significantly influences epilepsy recurrence risk.
  • No patients met the new epilepsy definition after a short period of seizure freedom.
  • Data suggest a revised definition of epilepsy after a first-ever seizure may be needed.