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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.

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...

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:

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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Investigating the Function of Deep Cortical and Subcortical Structures Using Stereotactic Electroencephalography: Lessons from the Anterior Cingulate Cortex

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Subcortical epilepsy?

Radwa A B Badawy¹, Alan Lai, Simon J Vogrin

¹Department of Clinical Neurosciences, St Vincent's Hospital, Sydney, Australia. badawyr@unimelb.edu.au

|May 15, 2013

Summary

This summary is machine-generated.

Epilepsy seizures involve widespread brain networks. This review explores evidence that subcortical structures may independently initiate seizures, impacting epilepsy treatment.

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Area of Science:

Neuroscience
Epileptology
Clinical Neurology

Background:

Historically, the cerebral cortex was considered the primary origin of epileptic seizures.
Recent evidence highlights widespread network interactions between cortical and subcortical structures in both normal brain function and epileptic seizures.
Subcortical structures are known to be engaged in various forms of generalized and focal epileptiform discharges.

Purpose of the Study:

To review evidence suggesting that subcortical structures can independently initiate epileptic seizures.
To explore the clinical implications of subcortical seizure initiation.
To shift focus from cortical origin to potential subcortical origins in epilepsy.

Main Methods:

Review of histopathologic findings.
Analysis of electrophysiologic studies.
Examination of brain imaging data.

Main Results:

Evidence supports the involvement of subcortical structures in seizure generation.
Different subcortical structures participate in seizure networks in diverse ways.
The review focuses on the potential for subcortical initiation, not the interaction itself.

Conclusions:

Subcortical structures may play a more active role in initiating seizures than previously thought.
Understanding subcortical initiation is crucial for developing new epilepsy therapies.
Further research into subcortical epilepsy origins is warranted.