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Related Concept Videos

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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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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Seizures l: Introduction01:20

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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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Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
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Pre-seizure state identified by diffuse optical tomography.

Tao Zhang1, Junli Zhou2, Ruixin Jiang1

  • 1J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida Gainesville, FL 32611, USA.

Scientific Reports
|January 22, 2014
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Summary
This summary is machine-generated.

Diffuse optical tomography (DOT) noninvasively tracks pre-seizure brain activity in rats, revealing early hemodynamic changes minutes before seizures. This functional neuroimaging tool maps seizure onset and propagation pathways.

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A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy
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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Detecting early brain activity changes before epileptic seizures is difficult.
  • Mapping seizure origin and evolution is crucial for intervention.

Purpose of the Study:

  • To demonstrate diffuse optical tomography (DOT) as a functional neuroimaging modality for tracking pre-seizure brain activity.
  • To investigate the spatiotemporal characteristics of brain activity preceding seizure onset in a rat model.

Main Methods:

  • Utilized a rat model of generalized epilepsy.
  • Employed diffuse optical tomography (DOT) for noninvasive, continuous brain activity tracking.
  • Correlated DOT-detected hemodynamic responses with intracranial electroencephalogram (EEG) gamma power changes.

Main Results:

  • Detected early hemodynamic responses and EEG gamma power changes minutes before electroencephalographic seizure onset, indicating a "pre-seizure" state.
  • Observed decoupling between local hemodynamic and neural activities.
  • Documented widespread hemodynamic changes originating locally (cortex, thalamus) and spreading throughout the brain.

Conclusions:

  • DOT offers high spatiotemporal resolution for noninvasive monitoring of pre-seizure brain states.
  • Generalized seizures may initiate locally rather than diffusely.
  • DOT is a powerful tool for mapping early seizure onset and propagation pathways.