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Related Concept Videos

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: 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:
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...
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 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...
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...

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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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Absence epilepsy and periventricular nodular heterotopia.

M C Y de Wit1, H M Schippers, I F M de Coo

  • 1Dept. of Pediatric Neurology, Erasmus MC Sophia Children's Hospital, P.O. Box 2040, 3000 CA, The Netherlands. m.c.y.dewit@erasmusmc.nl

Seizure
|July 20, 2010
PubMed
Summary
This summary is machine-generated.

A 4.5-year-old girl with absence seizures and 3 Hz spike-wave activity on EEG had periventricular heterotopia. This brain malformation may contribute to the generation of her specific seizure type.

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Area of Science:

  • Neuroscience
  • Epileptology
  • Developmental Neuroscience

Background:

  • Absence seizures are a type of generalized epilepsy characterized by brief lapses in awareness.
  • Electroencephalography (EEG) often shows a characteristic 3 Hz spike-wave pattern in absence seizures.
  • Brain malformations, including neuronal migration disorders, are increasingly recognized as potential causes of epilepsy.

Observation:

  • A 4.5-year-old girl presented with typical absence seizures.
  • EEG revealed sudden onset absence seizures with 3 Hz spike-wave discharges.
  • Ocular deviation during seizures prompted brain imaging.

Findings:

  • Magnetic Resonance Imaging (MRI) identified a periventricular nodular heterotopia in the right lateral ventricle.
  • Periventricular heterotopia are considered potentially epileptogenic malformations.
  • This finding suggests a possible link between neuronal migration disorders and specific EEG patterns.

Implications:

  • Periventricular heterotopia may influence the striato-thalamo-cortical network involved in 3 Hz spike-wave generation.
  • This case highlights the importance of investigating brain structure in pediatric epilepsy.
  • Understanding the relationship between malformations and epilepsy subtypes can inform diagnosis and treatment.