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Seizures: Classification

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:

Ischemic Stroke ll: Pathophysiology

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...

Hemorrhagic Stroke ll: Pathophysiology

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...

Cerebral Edema ll: Pathophysiology

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...

Seizures l: Introduction

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: Types

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...

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Related Experiment Video

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Continuous Video Electroencephalogram during Hypoxia-Ischemia in Neonatal Mice

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Changes in cerebral hemodynamics during simple partial motor seizures.

L Niehaus¹, U C Wieshmann, B Meyer

¹Department of Neurology, Charité, Campus Virchow Klinikum, Humboldt University, Berlin, Germany.

European Neurology

|July 15, 2000

Summary

This study shows focal epileptic seizures cause asymmetric increases in cerebral blood flow, closely matching seizure activity. Blood flow velocity in the middle cerebral artery rose significantly during seizures and returned to normal afterward.

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Area of Science:

Neurology
Neurophysiology
Medical Imaging

Background:

Understanding cerebral blood flow changes during epileptic seizures is crucial for diagnosis and treatment.
Simple partial motor seizures (SPS) are focal seizures originating in the brain's motor cortex.

Observation:

Cerebral perfusion was monitored in an 11-year-old girl during nine simple partial motor seizures.
Transcranial Doppler sonography measured blood flow velocity in the middle cerebral arteries (MCAs) alongside EEG monitoring.

Findings:

Within seconds of seizure onset, ipsilateral MCA flow velocity increased up to 70% above baseline.
Late seizure spread to the contralateral hemisphere caused a minor increase (<30%) in contralateral MCA flow velocity.
Post-seizure, MCA flow velocities normalized within approximately 47 seconds.

Implications:

Focal epileptic seizures induce asymmetrical cerebral perfusion changes directly correlated with electroencephalographic seizure activity.
These findings highlight the dynamic relationship between neuronal activity and cerebral hemodynamics during focal seizures.
This research contributes to understanding the neurovascular coupling in epilepsy.