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Related Concept Videos

Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

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...
Seizures l: Introduction01:20

Seizures l: Introduction

Understanding seizures and epilepsy relies on key definitions that help in recognizing, classifying, and managing these disorders. These definitions provide a framework for recognizing, classifying, and managing seizure disorders.DefinitionsA seizure is a sudden, abnormal burst of electrical activity in the brain that can cause changes in awareness, movement, sensation, or behavior, depending on the area involved. Epilepsy is a chronic condition characterized by recurrent, unprovoked seizures,...
Seizures: Classification01:13

Seizures: Classification

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:
Epilepsy ll: Types01:22

Epilepsy ll: Types

Recurrent seizures, stemming from abnormal electrical activity in the brain, are the defining characteristic of epilepsy, a chronic neurological condition. Because seizure features vary greatly, epilepsy is classified using two systems: by seizure type and by epilepsy syndromes. These classifications enable clinicians to describe seizure patterns and select suitable treatment strategies.I. Classification by Seizure Type1. Focal EpilepsyFocal epilepsy begins in one hemisphere of the brain.
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
Antiepileptic Drugs: GABAergic Pathway Potentiators01:18

Antiepileptic Drugs: GABAergic Pathway Potentiators

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 their...

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Related Experiment Video

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Preparing Undercut Model of Posttraumatic Epileptogenesis in Rodents
07:58

Preparing Undercut Model of Posttraumatic Epileptogenesis in Rodents

Published on: September 15, 2011

Epileptogenesis in the developing brain.

Claude G Wasterlain1, David S Gloss, Jerome Niquet

  • 1Department of Neurology, VA Greater Los Angeles Health Care System, and David Geffen School of Medicine at UCLA, Los Angeles, CA, USA.

Handbook of Clinical Neurology
|April 30, 2013
PubMed
Summary
This summary is machine-generated.

Repeated seizures in neonatal brains can harm development and learning, with effects varying by age and seizure type. Even some antiepileptic drugs may cause neuronal damage, highlighting the need for further research.

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Epilepsy Research

Background:

  • Neonatal brains exhibit immature GABAergic circuits where GABA acts excitably, promoting seizures (ictogenicity).
  • Early-life seizures can significantly disrupt brain development in an age-dependent manner, leading to lasting deficits.

Purpose of the Study:

  • To investigate the impact of experimental seizures and antiepileptic drugs on neonatal brain development and neuronal integrity.
  • To understand the age-, model-, and species-dependency of seizure-induced injury and epileptogenesis.
  • To explore the potential for drug-induced neuronal apoptosis.

Main Methods:

  • Utilized experimental seizure models in neonatal animals.
  • Examined age-dependent effects on developmental milestones, seizure thresholds, and cognitive functions.
  • Assessed neuronal injury (necrosis, apoptosis) and epileptogenesis following seizures and drug administration.

Main Results:

  • Repeated seizures at critical developmental ages cause permanent cognitive deficits, impair spatial mapping, and lower seizure thresholds.
  • Seizure-induced neuronal injury and the development of chronic epilepsy are highly dependent on age, seizure model, and species.
  • Hyperthermia exacerbates seizure-induced neuronal injury and epileptogenicity.
  • Antiepileptic drugs, even at therapeutic doses, can induce age-, drug-, and cell-type-dependent neuronal apoptosis.

Conclusions:

  • Early-life seizures pose significant risks to brain development and long-term neurological function.
  • The mechanisms underlying seizure-induced neuronal injury and epileptogenesis require further elucidation.
  • Understanding these mechanisms is crucial for preventing long-term consequences in conditions like epilepsy, despite uncertainties in direct human translation.