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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: Glutamate Antagonists01:14

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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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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.
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Focal Seizures
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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.
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Retinal thinning in epilepsy: A meta-analysis.

Thomas Chontos1, Richard Nicholas2, M Francesca Cordeiro3

  • 1University of Edinburgh, Edinburgh, UK.

Seizure
|August 3, 2025
PubMed
Summary
This summary is machine-generated.

Adults with epilepsy show significant retinal nerve fiber layer thinning, especially those treated with vigabatrin (VGB). This thinning, measurable by Optical Coherence Tomography (OCT), may indicate neurodegeneration and warrants further investigation as a biomarker.

Keywords:
EpilepsyOCTOptical coherence tomographyRNFLRetinaSeizures

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Epilepsy is associated with neurodegenerative changes, potentially leading to retinal thinning.
  • Optical Coherence Tomography (OCT) studies on retinal thickness in epilepsy have yielded inconsistent results.

Purpose of the Study:

  • To perform a meta-analysis on retinal layer thickness changes in adult and pediatric epilepsy using OCT.
  • To investigate the relationship between these retinal changes and epilepsy-related factors.

Main Methods:

  • Systematic search of PubMed, EMBASE, and Cochrane Library (2000-2024) following PRISMA 2020 guidelines.
  • Meta-analysis of peripapillary retinal nerve fiber layer thickness (pRNFLT) in epilepsy patients (VGB-exposed/unexposed adults, unexposed pediatric) versus controls.
  • Bias assessment using the modified Newcastle-Ottawa Scale (NOS).

Main Results:

  • 18 studies (1063 patients) were included.
  • Vigabatrin (VGB)-treated adults showed significant pRNFL thinning compared to non-VGB adults (WMD=-17.70 µm).
  • Adults with epilepsy (non-VGB) also had significant pRNFL thinning versus controls (WMD=-6.66 µm), most pronounced in superior/inferior quadrants. Pediatric epilepsy showed a non-significant trend toward thinning.

Conclusions:

  • Adult epilepsy is associated with significant pRNFL thinning, independent of VGB treatment, with a predilection for superior and inferior quadrants.
  • OCT may serve as a valuable biomarker for neurodegenerative changes in adult epilepsy, potentially aiding in monitoring and prognosis.
  • Further research is needed to confirm the clinical utility of OCT in epilepsy management.