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Related Concept Videos

Epilepsy and Seizures: Overview01:24

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.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...
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Seizures: Classification01:13

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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.
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Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein01:20

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Antiepileptic drugs, such as levetiracetam (Keppra) and brivaracetam (Briviact), have emerged as crucial tools in managing epilepsy. These medications exert their therapeutic effects by targeting the synaptic vesicle protein SV2A, a transmembrane glycoprotein primarily found in the brain.
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Antiepileptic Drugs: Potassium Channel Activators01:20

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Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...
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Overview of Synapses01:25

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A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
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Electroconvulsive Therapy01:30

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Electroconvulsive therapy (ECT), or shock therapy, remains a critical biomedical intervention for severe, treatment-resistant depression. While its origins can be traced back to Hippocrates' observations that malaria-induced convulsions alleviated mental illness, modern ECT has evolved significantly from its earlier, more primitive applications. First introduced in 1938 by Ugo Cerletti and his colleagues, ECT involves inducing controlled seizures using electrical currents. In its early...
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Updated: Mar 24, 2026

Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale
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Impaired Serotonergic Brainstem Function during and after Seizures.

Qiong Zhan1, Gordon F Buchanan2, Joshua E Motelow2

  • 1Departments of Neurology, Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China, Department of Neurology, the Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 4, 2016
PubMed
Summary
This summary is machine-generated.

Seizures suppress brainstem activity, particularly in lower brainstem serotonin neurons, leading to impaired breathing and heart rate. This research offers new avenues for preventing epilepsy complications and reducing mortality.

Keywords:
SUDEPbrainstemconsciousnessrespiratoryserotonintemporal lobe epilepsy

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Area of Science:

  • Neuroscience
  • Cardiorespiratory Physiology
  • Epilepsy Research

Background:

  • Seizures can cause dangerous impairments in breathing, heart function, and consciousness.
  • Brainstem function, especially serotonergic systems, is implicated in these seizure-related cardiorespiratory and arousal changes.
  • Direct evidence linking seizure activity to neuronal firing changes in brainstem serotonin pathways has been limited.

Purpose of the Study:

  • To investigate seizure-associated changes in neuronal activity within brainstem serotonergic regions.
  • To correlate these neuronal changes with cardiorespiratory function and arousal during and after seizures.
  • To elucidate the role of specific brainstem nuclei in seizure pathophysiology.

Main Methods:

  • Multiunit and single-unit recordings were performed in a rat seizure model.
  • Recordings targeted medullary raphe and midbrain dorsal raphe nuclei.
  • Breathing rate, tidal volume, minute ventilation, and heart rate were continuously monitored.
  • Serotonergic neurons were identified using immunohistochemistry.

Main Results:

  • Seizures significantly decreased respiratory rate, tidal volume, and minute ventilation.
  • Population firing in both medullary and midbrain raphe nuclei decreased during and after seizures.
  • Identified lower brainstem (medullary) serotonergic neurons showed consistently decreased firing.
  • Upper brainstem (midbrain) serotonergic neuron firing exhibited more variable responses.

Conclusions:

  • Markedly suppressed firing of lower brainstem serotonin neurons correlates with impaired cardiorespiratory function during seizures.
  • Decreased arousal likely results from depressed activity in upper brainstem and forebrain neuronal networks.
  • These findings highlight the critical role of brainstem serotonin systems in seizure complications and suggest therapeutic targets.