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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...
801
Seizures: Classification01:13

Seizures: Classification

903
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:
903
Antiepileptic Drugs: Calcium Channel Blockers01:17

Antiepileptic Drugs: Calcium Channel Blockers

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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...
832
Antiepileptic Drugs: Sodium Channel Blockers01:08

Antiepileptic Drugs: Sodium Channel Blockers

1.2K
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...
1.2K
Antiepileptic Drugs: Potassium Channel Activators01:20

Antiepileptic Drugs: Potassium Channel Activators

415
Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...
415
Antiepileptic Drugs: GABAergic Pathway Potentiators01:18

Antiepileptic Drugs: GABAergic Pathway Potentiators

913
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: Nov 12, 2025

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
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Cycles in epilepsy.

Philippa J Karoly1, Vikram R Rao2,3, Nicholas M Gregg4

  • 1Graeme Clark Institute, The University of Melbourne, Melbourne, Victoria, Australia. karoly.p@unimelb.edu.au.

Nature Reviews. Neurology
|March 16, 2021
PubMed
Summary
This summary is machine-generated.

Seizures in epilepsy are not random but follow predictable daily, multi-day, and yearly cycles. Understanding these seizure cycles can lead to better seizure forecasting and chronotherapy.

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Area of Science:

  • Neurology
  • Neuroscience
  • Chronobiology

Background:

  • Epilepsy is a dynamic neurological disorder characterized by seizures.
  • Traditionally, seizures were considered random events.
  • Historical observations suggest temporal patterns in seizure occurrence.

Purpose of the Study:

  • To review evidence for cyclical patterns in seizure occurrence.
  • To synthesize data from diverse sources including historical studies and modern technology.
  • To explore mechanistic underpinnings and clinical applications of seizure cycles.

Main Methods:

  • Review of historical observational studies.
  • Analysis of chronic brain recordings from humans and animals.
  • Examination of electronic seizure diaries.
  • Synthesis of laboratory-based animal neurophysiology data.

Main Results:

  • Converging evidence supports the existence of seizure cycles on daily (circadian), multi-day (multidien), and yearly (circannual) timescales.
  • Quantitative characterization of seizure cycles is now possible with direct brain recordings.
  • Mechanistic insights into these cycles are advancing.

Conclusions:

  • Seizure occurrence in epilepsy is not random but exhibits predictable temporal organization.
  • Understanding seizure cycles offers potential for clinical applications like seizure forecasting and chronotherapy.
  • Further research is needed to fill remaining knowledge gaps regarding seizure cycle mechanisms.