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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

1.2K
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:
1.2K
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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Related Experiment Video

Updated: Dec 13, 2025

Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale
07:35

Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale

Published on: July 8, 2025

810

Cues for seizure timing.

Vikram R Rao1, Marc G Leguia2, Thomas K Tcheng3

  • 1Department of Neurology and Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, California.

Epilepsia
|August 2, 2020
PubMed
Summary
This summary is machine-generated.

Epilepsy seizures exhibit cyclical patterns over daily, multi-day, and yearly timescales. Understanding these seizure cycles using chronic electroencephalography (cEEG) can improve epilepsy diagnosis and treatment.

Keywords:
chronobiologycircadiancircannualmultidienseizure cycleszeitgeber

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Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits
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Area of Science:

  • Neuroscience
  • Chronobiology
  • Epilepsy Research

Background:

  • The cyclical nature of epileptic seizures has been recognized for centuries.
  • Historically, celestial, hormonal, and environmental factors were proposed to influence seizure timing.
  • Modern technology like chronic electroencephalography (cEEG) and statistical methods enable testing these historical hypotheses.

Purpose of the Study:

  • To investigate seizure timing through a contemporary lens, examining influences over multiple timescales.
  • To present new evidence for circadian, multidien, and circannual variations in seizure activity.
  • To explore the implications of multiscale temporal organization for epilepsy diagnosis and therapy.

Main Methods:

  • Analysis of large chronic electroencephalography (cEEG) datasets.
  • Application of circular statistics suitable for analyzing cyclical phenomena.
  • Examination of seizure timing across circadian (daily), multidien (multi-day), and circannual (yearly) scales.

Main Results:

  • New evidence demonstrates circadian (day-night) variation in seizure activity.
  • Multidien (multi-day) periodicity in seizure occurrence was identified.
  • Circannual (about-yearly) variations in seizure frequency were observed.

Conclusions:

  • Seizure activity is organized across multiple timescales, influenced by both external and internal biological rhythms.
  • Understanding these multiscale seizure cycles has significant implications for clinical epilepsy management.
  • Future research will focus on the mechanistic basis of seizure cycles, particularly multidien periodicity.