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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:

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 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 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...

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.

Antiepileptic Drugs: Sodium Channel Blockers

Antiepileptic Drugs: Sodium Channel Blockers

Antiepileptic drugs are specialized medications that prevent seizures in individuals diagnosed with epilepsy. These drugs primarily function by blocking the movement of sodium ions through channels in the neuronal membrane, inhibiting the repetitive firing of action potentials often associated with seizures.
Sodium channel blockers modulate ion channels, particularly voltage-gated sodium channels. They block only sodium ion movement.
Among the most commonly prescribed antiepileptic drugs are...

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Related Experiment Video

Updated: Jun 25, 2026

Continuous Video Electroencephalogram during Hypoxia-Ischemia in Neonatal Mice

Continuous Video Electroencephalogram during Hypoxia-Ischemia in Neonatal Mice

Published on: June 11, 2020

[Neonatal refractory seizures].

Jaume Campistol¹

¹Servei Neurologia, Hospital Sant Joan de Déu, Universitat de Barcelona, Barcelona, España. campistol@hsdbcn.es

|February 26, 2009

Summary

Neonatal seizures and infant epilepsies require specialized care. Early diagnosis and alternative treatments, beyond anti-epileptic drugs (AEDs), are crucial for preventing neurological damage and improving outcomes.

Area of Science:

Pediatric Neurology
Neonatology
Epileptology

Context:

Neonatal and infant convulsions present diverse etiologies, prognoses, and treatment challenges.
Severe neonatal epileptic encephalopathies, like Ohtahara syndrome, carry high morbidity and mortality.
Some neonatal and infant epilepsies are refractory to conventional anti-epileptic drugs (AEDs).

Purpose:

To explore metabolic defects underlying neonatal and infant convulsions and epilepsies.
To review alternative treatment strategies for drug-resistant epilepsy in infants.
To emphasize the importance of timely intervention for preventing neurological deterioration.

Summary:

Convulsions in neonates and infants can stem from various causes, necessitating expert evaluation by neonatologists or neuropediatricians.

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Non-restraining EEG Radiotelemetry: Epidural and Deep Intracerebral Stereotaxic EEG Electrode Placement

Non-restraining EEG Radiotelemetry: Epidural and Deep Intracerebral Stereotaxic EEG Electrode Placement

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Last Updated: Jun 25, 2026

Continuous Video Electroencephalogram during Hypoxia-Ischemia in Neonatal Mice

Continuous Video Electroencephalogram during Hypoxia-Ischemia in Neonatal Mice

Published on: June 11, 2020

Recording EEG in Freely Moving Neonatal Rats Using a Novel Method

Recording EEG in Freely Moving Neonatal Rats Using a Novel Method

Published on: May 29, 2017

Non-restraining EEG Radiotelemetry: Epidural and Deep Intracerebral Stereotaxic EEG Electrode Placement

Non-restraining EEG Radiotelemetry: Epidural and Deep Intracerebral Stereotaxic EEG Electrode Placement

Published on: June 25, 2016

Certain severe epileptic encephalopathies in this age group have a poor prognosis.

For epilepsy cases unresponsive to AEDs, initiating alternative therapies promptly is vital to avert neurological decline and enable a better quality of life.

Impact:

Highlights the need for specialized diagnostic and therapeutic approaches in neonatal and infant epilepsy.
Underscores the potential of non-AED treatments for improving long-term neurological outcomes.
Aims to guide clinicians in managing complex cases of early-onset seizures and epilepsy.