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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...

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:

Seizures l: Introduction

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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,...

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

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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.
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Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy

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Secondarily generalized seizures in temporal lobe epilepsy.

Beata Bone¹, András Fogarasi, Reinhard Schulz

¹Department of Neurology, University of Pécs, Pécs, Hungary.

|March 21, 2012

Summary

Hippocampal sclerosis on MRI and older age are linked to secondarily generalized tonic-clonic seizures (SGTCS) in temporal lobe epilepsy (TLE). Clinical features can help identify high-risk patients for SGTCS during presurgical evaluation.

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Area of Science:

Neurology
Epileptology
Neuroimaging

Background:

Secondarily generalized tonic-clonic seizures (SGTCS) are rare in temporal lobe epilepsy (TLE) but pose significant risks, including sudden death and fatal injuries.
Identifying clinical predictors of SGTCS is crucial for risk stratification and management in TLE patients.

Purpose of the Study:

To investigate clinical factors associated with SGTCS occurrence in TLE.
To differentiate TLE patients with and without a history of SGTCS.
To explore the relationship between secondarily generalized seizures and preceding seizure elements or clinical data.

Main Methods:

Analysis of 171 TLE patients undergoing presurgical evaluation with video-electroencephalography (EEG) and magnetic resonance imaging (MRI).
Reevaluation of consecutively recorded seizures (up to three per patient) from 402 total video-recorded seizures.
Correlation of clinical data and seizure semiology with the presence of SGTCS history.

Main Results:

Hippocampal sclerosis on MRI showed a positive association with SGTCS history.
Ictal speech and pedal automatism were negatively associated with SGTCS history.
Older patient age was positively associated with SGTCS, while pre-seizure reactivity, oral/pedal automatisms, and vocalizations were negatively associated with secondary generalization.

Conclusions:

Clinical features, including MRI findings and seizure semiology, can aid in identifying TLE patients at higher risk for SGTCS.
Understanding these associations may contribute to elucidating the pathophysiology of seizure generalization.