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Related Concept Videos

Epilepsy ll: Types01:22

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: Classification01:13

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:
Epilepsy and Seizures: Overview01:24

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: Introduction01:20

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: Types01:19

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 Antagonists01:14

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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Related Experiment Video

Updated: Jun 28, 2026

Simultaneous Video-EEG-ECG Monitoring to Identify Neurocardiac Dysfunction in Mouse Models of Epilepsy
11:54

Simultaneous Video-EEG-ECG Monitoring to Identify Neurocardiac Dysfunction in Mouse Models of Epilepsy

Published on: January 29, 2018

Catamenial epilepsy.

Patricia E Penovich1, Sandra Helmers

  • 1Minnesota Epilepsy Group PA, Department of Neurology, University of Minnesota, Minnesota 55102, USA.

International Review of Neurobiology
|October 22, 2008
PubMed
Summary
This summary is machine-generated.

Catamenial epilepsy, linked to hormonal changes in women, involves cyclical seizure worsening. Progesterone therapy offers a promising approach to manage seizures by counteracting estrogen

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Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture
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Published on: December 22, 2016

Pentylenetetrazole-Induced Kindling Mouse Model
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Pentylenetetrazole-Induced Kindling Mouse Model

Published on: June 12, 2018

Related Experiment Videos

Last Updated: Jun 28, 2026

Simultaneous Video-EEG-ECG Monitoring to Identify Neurocardiac Dysfunction in Mouse Models of Epilepsy
11:54

Simultaneous Video-EEG-ECG Monitoring to Identify Neurocardiac Dysfunction in Mouse Models of Epilepsy

Published on: January 29, 2018

Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture
09:06

Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture

Published on: December 22, 2016

Pentylenetetrazole-Induced Kindling Mouse Model
07:06

Pentylenetetrazole-Induced Kindling Mouse Model

Published on: June 12, 2018

Area of Science:

  • Neuroendocrinology
  • Epileptology
  • Reproductive Medicine

Background:

  • Catamenial epilepsy affects nearly 40% of women with epilepsy, characterized by cyclical seizure exacerbation.
  • Seizure patterns correlate with estrogen predominance or inadequate progesterone during specific menstrual cycle phases.
  • Estrogen and progesterone significantly influence central nervous system excitability and GABA-A receptor function.

Purpose of the Study:

  • To investigate the neurosteroidal mechanisms underlying catamenial epilepsy.
  • To evaluate the potential of progesterone therapy and novel neurosteroids for seizure control.

Main Methods:

  • Review of existing literature on hormonal influences in epilepsy.
  • Analysis of animal models demonstrating neurosteroidal effects on seizure susceptibility.
  • Examination of cell culture studies on neurosteroid-GABA-A receptor interactions.

Main Results:

  • Estrogen enhances seizure activity (kindling, lowers after discharge threshold).
  • Progesterone exhibits inhibitory effects, reducing seizure susceptibility in animal models.
  • Neurosteroidal hormones modulate GABA-A receptor activity.

Conclusions:

  • Hormonal fluctuations, particularly estrogen/progesterone imbalance, are key drivers of catamenial epilepsy.
  • Progesterone therapy presents a viable treatment strategy.
  • Development of synthetic neurosteroids holds promise for improved seizure management in affected women.