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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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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.
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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Related Experiment Video

Updated: Dec 20, 2025

Preparation and Implantation of Electrodes for Electrically Kindling VGAT-Cre Mice to Generate a Model for Temporal Lobe Epilepsy
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Dynamic oxygen changes during status epilepticus and subsequent endogenous kindling.

Marshal D Wolff1, Jordan S Farrell1,2, Morris H Scantlebury1,3,4

  • 1Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada.

Epilepsia
|June 2, 2020
PubMed
Summary

Brain tissue oxygen levels initially increase during status epilepticus (SE) then decrease during subsequent seizure activity. These dynamic oxygen changes may indicate ongoing brain pathology.

Keywords:
epilepsyhyperoxiahypoxiaseizuresstatus epilepticus

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Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Brain Metabolism

Background:

  • Brain tissue oxygen (partial oxygen pressure [pO2]) is critical for function.
  • Deviations from normoxia impair brain function.
  • Oxygen levels during prolonged seizures (status epilepticus [SE]) and kindling are unknown.

Purpose of the Study:

  • To investigate brain tissue oxygenation during and after status epilepticus (SE).
  • To explore oxygen dynamics during the endogenous kindling period in epilepsy models.

Main Methods:

  • Used two rat models of acquired temporal lobe epilepsy.
  • Measured dorsal hippocampal tissue oxygen using an optode during and after SE.

Main Results:

  • Hyperoxia was observed in the hippocampus during induced SE.
  • Recurrent epileptiform activity post-SE was linked to dynamic oxygen changes.
  • Increased seizure severity correlated with postictal hypoxia.

Conclusions:

  • Induced SE and subsequent epileptiform activity have opposing effects on brain oxygenation.
  • Brain tissue oxygen dynamics may serve as a biomarker for pathological brain activity.