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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,...

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.

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...

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: May 11, 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 seizures.

Perrine Plouin¹, Anna Kaminska

¹Hôpital Necker-Enfants Malades, Paris, France.

Handbook of Clinical Neurology

|April 30, 2013

Summary

This summary is machine-generated.

Neonatal seizures (NNS) are common and have high mortality. Accurate diagnosis and identification of causes like hypoxic-ischemic encephalopathy are crucial for prognosis.

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Last Updated: May 11, 2026

Continuous Video Electroencephalogram during Hypoxia-Ischemia in Neonatal Mice

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Published on: June 11, 2020

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Published on: February 18, 2012

Area of Science:

Neonatal neurology
Pediatric epilepsy

Background:

Neonatal seizures (NNS) are the most frequent seizures across all age groups, occurring in 1.5-5.5/1000 live births, primarily within the first week of life.
NNS present a high mortality rate (20-45%) and diagnostic challenges due to varied semiology, including subtle seizures and autonomic signs.

Purpose of the Study:

To review the incidence, etiology, semiology, diagnosis, and prognosis of neonatal seizures.
To highlight the importance of electroencephalogram (EEG) in seizure recognition and prognostic assessment.

Main Methods:

Review of literature on neonatal seizures, focusing on incidence, clinical presentation, and diagnostic approaches.
Analysis of common and less frequent etiologies, including hypoxic-ischemic encephalopathy, stroke, infections, and metabolic disorders.

Main Results:

Hypoxic-ischemic encephalopathy is the leading cause (40-45%) of NNS, often presenting with diverse seizure types.
Electroencephalogram (EEG) is essential for seizure identification; interictal EEG patterns aid in prognosis assessment.
Other significant etiologies include ischemic stroke, brain infections, metabolic disorders, chromosomal abnormalities, and vitamin B6 dependency.

Conclusions:

Accurate diagnosis and differentiation from non-epileptic paroxysmal events are critical challenges in managing NNS.
Prognosis varies significantly, with some neonatal epilepsy syndromes having favorable outcomes while others are associated with severe neurological impairment.