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Related Concept Videos

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:
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,...
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.
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...
Antiepileptic Drugs: Potassium Channel Activators01:20

Antiepileptic Drugs: Potassium Channel Activators

Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...

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Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy
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Published on: September 20, 2024

Seizure onset determination.

Ernst Rodin1, Tawnya Constantino, Stefan Rampp

  • 1Department of Neurology, University of Utah, Sandy, Utah, USA. erodin@pcu.net

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|January 20, 2009
PubMed
Summary
This summary is machine-generated.

Digital electroencephalography (EEG) offers advanced data analysis for epilepsy. This review highlights using infraslow activity (ISA) and high-frequency activity (HFA) to better define seizure onset for improved epilepsy surgery outcomes.

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Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale
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Published on: July 8, 2025

Area of Science:

  • Neuroscience
  • Clinical Neurology
  • Biomedical Engineering

Background:

  • Digital electroencephalography (EEG) provides extensive data analysis capabilities.
  • Commercial EEG software is underutilized in preoperative epilepsy evaluation.
  • Identifying precise seizure onset is crucial for effective epilepsy surgery.

Purpose of the Study:

  • To demonstrate how advanced EEG analysis techniques can improve seizure onset definition.
  • To advocate for the wider adoption of specific EEG analysis methods in clinical practice.
  • To explore the potential of infraslow activity (ISA) and high-frequency activity (HFA) in localizing epileptogenic zones.

Main Methods:

  • Reviewing post hoc filter settings, expanded electrode coverage, and specialized electrode montages for EEG analysis.
  • Evaluating infraslow activity (ISA) by adjusting the high-pass filter to 0.01 Hz in scalp recordings.
  • Observing high-frequency activity (HFA) in intracranial recordings.

Main Results:

  • Judicious use of post hoc filters, expanded electrode coverage, and special montages can refine seizure onset definition.
  • ISA in scalp EEG and HFA in intracranial EEG, due to their smaller electrical fields, may offer better seizure onset localization.
  • These advanced EEG markers (ISA and HFA) have the potential to improve the precision of identifying epileptogenic tissue.

Conclusions:

  • Implementing ISA and HFA assessments in retrospective analyses is recommended to determine their clinical value for epilepsy surgery.
  • Correlating the presence of ISA and HFA in resected tissue with surgical outcomes will clarify their significance.
  • Further research is needed to validate the utility of ISA and HFA for optimizing epilepsy surgical interventions.