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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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Antiepileptic Drugs: GABAergic Pathway Potentiators01:18

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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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Antiepileptic Drugs: Glutamate Antagonists01:14

Antiepileptic Drugs: Glutamate Antagonists

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Glutamate is a fundamental neurotransmitter in the central nervous system, playing a vital role in neuronal communication and various cognitive processes. Glutamate stands as the principal excitatory neurotransmitter in the brain. Its presence is crucial for the communication between neurons, underpinning essential processes such as synaptic transmission, neuronal excitability, and plasticity. These functions are vital for higher-order cognitive processes, including learning and memory. The...
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Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein01:20

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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: Potassium Channel Activators01:20

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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.
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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.
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Related Experiment Video

Updated: Apr 18, 2026

Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
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Functional network alterations and their structural substrate in drug-resistant epilepsy.

Lorenzo Caciagli1, Boris C Bernhardt1, Seok-Jun Hong1

  • 1Neuroimaging of Epilepsy Laboratory, McConnell Brain Imaging Center, Montreal Neurological Institute and Hospital, McGill University Montreal, QC, Canada.

Frontiers in Neuroscience
|January 8, 2015
PubMed
Summary

Functional MRI (fMRI) analysis techniques reveal significant network alterations in drug-resistant epilepsies. These findings offer potential biomarkers for epilepsy diagnosis, surgical planning, and outcome prediction.

Keywords:
connectivityepilepsygraph-theoryresting-state

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Electroconvulsive Seizures in Rats and Fractionation of Their Hippocampi to Examine Seizure-induced Changes in Postsynaptic Density Proteins
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Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
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Electroconvulsive Seizures in Rats and Fractionation of Their Hippocampi to Examine Seizure-induced Changes in Postsynaptic Density Proteins
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Recording and Modulation of Epileptiform Activity in Rodent Brain Slices Coupled to Microelectrode Arrays
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Area of Science:

  • Neuroimaging
  • Epileptology
  • Functional MRI Analysis

Background:

  • MRI revolutionized epilepsy management by identifying seizure-onset lesions.
  • Drug-resistant epilepsies show chronic alterations in brain network organization.
  • Focal cortical dysplasia and mesial temporal sclerosis are common causes of drug-resistant epilepsy.

Purpose of the Study:

  • To review methodological advancements in functional MRI (fMRI) analysis for drug-resistant epilepsies.
  • To apply these techniques to temporal lobe epilepsy (TLE) and extra-temporal lobe epilepsy (ETLE).
  • To emphasize resting-state fMRI for probing intrinsic brain network integrity.

Main Methods:

  • Review of recent methodological developments in fMRI analysis.
  • Application of task-free (resting-state) fMRI techniques.
  • Analysis of regional, inter-regional, and connectome-wide network integrity.

Main Results:

  • TLE shows disrupted ipsilateral mesiotemporal lobe connectivity and contralateral compensatory reorganization.
  • Large-scale brain networks exhibit striking reconfigurations in TLE.
  • Cortical dysplasia reveals functional alterations in lesional, peri-lesional, and remote regions.

Conclusions:

  • fMRI mapping demonstrates disrupted brain network organization in common drug-resistant epilepsies.
  • These functional alterations provide potential biomarkers for diagnosis and presurgical planning.
  • Further research is needed to validate fMRI biomarkers for reliability, sensitivity, and specificity.