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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:

Epilepsy and Seizures: Overview

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: Types

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 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...

Antiepileptic Drugs: Glutamate Antagonists

Antiepileptic Drugs: Glutamate Antagonists

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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Myoclonus and epilepsy.

Renzo Guerrini¹, Takeo Takahashi

¹Pediatric Neurology Unit and Laboratories, Children's Hospital A. Meyer - University of Florence, Florence, Italy.

Handbook of Clinical Neurology

|April 30, 2013

Summary

This summary is machine-generated.

Epileptic myoclonus, a manifestation of epilepsy, involves descending neurons and can be classified into cortical, thalamo-cortical, and reticular types. Understanding these types is crucial for diagnosing and managing epilepsy syndromes effectively.

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Area of Science:

Neurology
Epileptology
Neurophysiology

Background:

Epileptic myoclonus is an elementary electroclinical manifestation of epilepsy.
It involves descending neurons and can amplify spatially or temporally to trigger overt epileptic activity.
Classification includes cortical (positive and negative), secondarily generalized, thalamo-cortical, and reticular types.

Purpose of the Study:

To define and classify epileptic myoclonus.
To elucidate the relationship between different types of epileptic myoclonus and epilepsy syndromes.
To differentiate epileptic myoclonus from movement disorders and other seizure manifestations.

Main Methods:

Clinical electroencephalography (EEG) and neurophysiological studies.
Classification based on electroclinical manifestations and presumed neuronal origins (cortical, thalamo-cortical, reticular).
Correlation of myoclonus with specific epilepsy syndromes and seizure types.

Main Results:

Cortical epileptic myoclonus is linked to partial or symptomatic generalized epilepsy.
Thalamo-cortical epileptic myoclonus is associated with idiopathic generalized epilepsy.
Reflex reticular myoclonus corresponds to brainstem reticular formation epileptic activity.

Conclusions:

Epileptic myoclonus can be a component of a seizure, the sole manifestation, or a stable condition mimicking movement disorders.
The correlation between myoclonus and epilepsy is evident in conditions like epilepsia partialis continua.
Neurophysiological studies are essential for less obvious cases, such as cortical tremor, to demonstrate the epileptic origin.