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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

Seizures: Classification

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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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Epilepsy ll: Types01:22

Epilepsy ll: Types

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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.
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Seizures l: Introduction01:20

Seizures l: Introduction

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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,...
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Inborn Errors of Metabolism01:20

Inborn Errors of Metabolism

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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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Disorders of the Nervous Tissue01:28

Disorders of the Nervous Tissue

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Nervous tissue is a vital component of the human body's communication system, enabling us to perceive and respond to stimuli. However, like all other tissues, it is vulnerable to disorders and diseases that can significantly impact our neurological functioning.
Homeostatic Imbalances:
Alzheimer's disease manifests as a gradual decline in memory and cognitive abilities, attributed to the buildup of amyloid plaques and neurofibrillary tangles in the brain.
Parkinson's disease arises from the...
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Updated: Apr 30, 2026

Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
07:47

Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy

Published on: July 9, 2016

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Mitochondrial disorders and epilepsy.

I Desguerre1, M Hully2, M Rio3

  • 1Unité de neuropédiatrie, hôpital Necker, 149, rue de Sèvres, 75015 Paris, France; CARAMEL, centre de référence maladies mitochondriales, hôpital Necker, 149, rue de Sèvres, 75015 Paris, France.

Revue Neurologique
|May 10, 2014
PubMed
Summary
This summary is machine-generated.

Mitochondrial respiratory chain defects (RCD) frequently cause epilepsy, particularly in children. Seizures worsen neuronal energy failure, highlighting the need for effective treatments for mitochondrial disorders.

Keywords:
Alpers syndromeDéficit de la chaîne respiratoireEpilepsyKetogen dietMaladies mitochondrialesMitochondrial disordersRespiratory chain deficiencyRégime cétogèneSyndrome d’AlpersÉpilepsie

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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
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Author Spotlight: Decoding Mitochondrial Aging
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Area of Science:

  • Neurology
  • Genetics
  • Metabolic Disorders

Background:

  • Mitochondrial respiratory chain defects (RCD) commonly affect the brain, a high-energy-demand tissue.
  • Epilepsy occurs in 30% of mitochondrial disorder patients, with varied presentations, treatments, and prognoses in children and adults.
  • Early-onset childhood mitochondrial disorders often have severe outcomes, with epilepsy being difficult to manage in 95% of cases.

Purpose of the Study:

  • To review the impact of mitochondrial disorders on epilepsy.
  • To discuss age-related epileptic phenotypes in infancy.
  • To explore treatment options, including the ketogenic diet.

Main Methods:

  • Literature review of mitochondrial disorders and epilepsy.
  • Analysis of age-specific epileptic phenotypes.
  • Discussion of genetic origins (nDNA vs. mtDNA mutations) in pediatric and adult epilepsy.

Main Results:

  • Four infant epileptic phenotypes are identified: infantile spasms, refractory status epilepticus, epilepsia partialis continua, and myoclonic epilepsy.
  • Pediatric mitochondrial epilepsy is more often linked to nuclear DNA (nDNA) mutations, while adult epilepsy is more associated with mitochondrial DNA (mtDNA) mutations.
  • Epilepsy exacerbates neuronal energy deficits, creating a detrimental cycle.

Conclusions:

  • Epileptic seizures worsen energy failure in neurons affected by mitochondrial disorders.
  • The ketogenic diet is a potential therapeutic option for refractory or recurrent status epilepticus in mitochondrial epilepsy.