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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:
2.5K
Seizures ll: Types01:19

Seizures ll: Types

36
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...
36
Epilepsy ll: Types01:22

Epilepsy ll: Types

47
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.
47
Seizures l: Introduction01:20

Seizures l: Introduction

42
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,...
42
Antiepileptic Drugs: Glutamate Antagonists01:14

Antiepileptic Drugs: Glutamate Antagonists

1.3K
Glutamate is a fundamental neurotransmitter in the central nervous system, playing a vital role in neuronal communication and various cognitive processes. Glutamate stands as the principal excitatory neurotransmitter in the brain. Its presence is crucial for the communication between neurons, underpinning essential processes such as synaptic transmission, neuronal excitability, and plasticity. These functions are vital for higher-order cognitive processes, including learning and memory. The...
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Related Experiment Video

Updated: May 2, 2026

Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits
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[PET and SPECT in epilepsy].

X Setoain1, M Carreño2, J Pavía3

  • 1Servicio de Medicina Nuclear, Hospital Clínic de Barcelona, Barcelona, España; Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Grupo de imagen biomédica, Barcelona, España.

Revista Espanola De Medicina Nuclear E Imagen Molecular
|February 26, 2014
PubMed
Summary
This summary is machine-generated.

Functional neuroimaging using SPECT and PET aids in localizing the seizure focus for epilepsy surgery. These techniques, including ictal SPECT and (18)FDG PET, help identify the epileptogenic zone for improved patient outcomes.

Keywords:
EpilepsiaEpilepsyIctal SPECTInterictal SPECTPositron emission tomographySISCOMSPECT ictalSPECT interictalTomografía por emisión de positrones

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The Pilocarpine Model of Temporal Lobe Epilepsy and EEG Monitoring Using Radiotelemetry System in Mice
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Long-term Continuous EEG Monitoring in Small Rodent Models of Human Disease Using the Epoch Wireless Transmitter System
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Area of Science:

  • Neurology
  • Nuclear Medicine
  • Neuroimaging

Background:

  • Epilepsy affects 1-2% of the population, often requiring surgical intervention for drug-resistant cases.
  • Traditional methods like video-EEG and MRI have limitations in precisely localizing the epileptogenic zone.
  • Functional neuroimaging offers advanced tools for pre-surgical epilepsy evaluation.

Purpose of the Study:

  • To review the principles and methodologies of SPECT and PET in epilepsy.
  • To detail SPECT injection mechanisms and perfusion patterns.
  • To describe PET imaging techniques and their application in epilepsy.

Main Methods:

  • Review of SPECT and PET imaging principles and techniques in epilepsy.
  • Analysis of ictal SPECT perfusion patterns (ictal, postictal, interictal).
  • Description of PET (18)FDG methodology, quantification, and image evaluation.
  • Discussion of image analysis methods including subtraction and fusion with MRI.

Main Results:

  • Ictal SPECT shows increased blood flow at the seizure onset zone.
  • (18)FDG PET reveals decreased glucose metabolism in the interictal deficit zone.
  • SPECT and PET demonstrate utility in localizing the epileptogenic area for surgical planning.

Conclusions:

  • SPECT and PET are valuable tools for pre-surgical localization of the epileptogenic zone in epilepsy.
  • Understanding the different patterns and methodologies of these imaging techniques is crucial.
  • These functional neuroimaging modalities guide surgical decisions in both temporal and extratemporal epilepsy.