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Related Concept Videos

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:
Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
Seizures ll: Types01:19

Seizures ll: Types

Seizures are sudden bursts of abnormal electrical discharge in the brain that interfere with normal function. They are commonly divided into three groups: focal seizures, generalized seizures, and other types that do not fit neatly into either category.Focal SeizuresFocal seizures begin in a single brain region. When awareness is preserved, they are called focal aware seizures and may cause sensations such as tingling, unusual smells, or flashing lights. When awareness is impaired, they are...
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...
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.

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Related Experiment Video

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SECONDs Administration Guidelines: A Fast Tool to Assess Consciousness in Brain-injured Patients
11:05

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Published on: February 6, 2021

Impaired consciousness in epilepsy.

Hal Blumenfeld1

  • 1Departments of Neurology, Neurobiology, and Neurosurgery, Yale University School of Medicine, New Haven, CT 06520, USA. hal.blumenfeld@yale.edu

The Lancet. Neurology
|August 18, 2012
PubMed
Summary

Epileptic seizures often cause temporary loss of consciousness, impacting safety and quality of life. Understanding how seizures affect the brain

Area of Science:

  • Neuroscience
  • Epileptology

Background:

  • Consciousness is vital for human functioning.
  • Epileptic seizures frequently cause transient loss of consciousness, leading to significant safety, productivity, and emotional challenges.
  • Understanding the neural mechanisms of consciousness impairment during seizures is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate how epileptic seizures disrupt the consciousness system.
  • To identify common anatomical structures affected across diverse seizure types.
  • To elucidate the mechanisms underlying consciousness impairment in epilepsy.

Main Methods:

  • Utilized advances in neuroimaging techniques.
  • Employed electrophysiology for brain activity analysis.

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  • Conducted prospective behavioral testing to assess consciousness levels.

    • Main Results:

    • Epileptic seizures disrupt a specialized network of cortical-subcortical structures responsible for maintaining alertness, attention, and awareness.
    • Diverse seizure types, including absence, generalized tonic-clonic, and complex partial seizures, converge on these critical anatomical structures.
    • Different seizure mechanisms converge to impair consciousness.

    Conclusions:

    • Understanding the mechanisms by which seizures affect the consciousness system is key to preventing impairment.
    • Improved treatment strategies can be developed to mitigate consciousness disruption in epilepsy.
    • Enhancing the quality of life for individuals with epilepsy is a primary goal.