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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 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,...

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: 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:

Encephalitis l: Introduction

Encephalitis l: Introduction

Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...

Encephalitis ll: Pathophysiology

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...

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Updated: May 16, 2026

Generation and On-Demand Initiation of Acute Ictal Activity in Rodent and Human Tissue

Generation and On-Demand Initiation of Acute Ictal Activity in Rodent and Human Tissue

Published on: January 19, 2019

Epileptic encephalopathies: an overview.

Sonia Khan¹, Raidah Al Baradie

¹Department of Clinical Neurosciences, Prince Sultan Military Medical City, P.O. Box 7897, Riyadh 11159, Saudi Arabia.

Epilepsy Research and Treatment

|December 6, 2012

Summary

Epileptic encephalopathies are severe neurological disorders marked by seizures and cognitive decline. Management is challenging as these conditions often resist standard treatments.

Area of Science:

Neurology
Epileptology
Pediatric Neurology

Background:

Epileptic encephalopathies encompass severe epilepsy syndromes characterized by epileptiform abnormalities and progressive cerebral dysfunction.
The International League Against Epilepsy recognizes eight age-related syndromes, including early myoclonic encephalopathy, Ohtahara syndrome, West syndrome, Dravet syndrome, Lennox-Gastaut syndrome, and Landau-Kleffner syndrome.

Purpose of the Study:

To provide a comprehensive overview of epileptic encephalopathies.
To discuss clinical neurophysiological features, cognitive deterioration, and management strategies for these complex conditions.

Main Methods:

Literature review and synthesis of current knowledge on epileptic encephalopathies.
Classification and description of recognized age-related syndromes.

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Electrophoretic Delivery of γ-aminobutyric Acid (GABA) into Epileptic Focus Prevents Seizures in Mice

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Discussion of refractory epilepsy management.

Main Results:

Epileptic encephalopathies present with diverse age-specific syndromes and progressive neurological impairment.
These conditions are frequently refractory to conventional antiepileptic drugs, necessitating specialized treatment approaches.
Clinical neurophysiological findings and cognitive decline are hallmark features.

Conclusions:

Epileptic encephalopathies represent a spectrum of severe epilepsy syndromes requiring specialized diagnostic and therapeutic interventions.
Effective management often involves a multidisciplinary approach due to treatment refractoriness and progressive cerebral dysfunction.