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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

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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.
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:
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Epilepsy and Seizures: Overview01:24

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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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Antiepileptic Drugs: Sodium Channel Blockers01:08

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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.
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Antiepileptic Drugs: Glutamate Antagonists01:14

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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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Antiepileptic Drugs: Calcium Channel Blockers01:17

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Calcium channel blockers, a class of antiepileptic drugs, regulate the flow of calcium ions within neurons.
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Related Experiment Video

Updated: Mar 14, 2026

Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits
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Nonepileptic seizures - objective phenomena.

W Curt Lafrance1, R Ranieri2, A S Blum3

  • 1Division of Neuropsychiatry and Behavioral Neurology, Rhode Island Hospital, Providence, RI, USA.

Handbook of Clinical Neurology
|October 11, 2016
PubMed
Summary
This summary is machine-generated.

Diagnosing psychogenic nonepileptic seizures (PNES) requires evaluating multiple factors, including patient history, seizure symptoms, and EEG results. A comprehensive approach ensures reliable PNES diagnosis and effective patient care.

Keywords:
classificationcomorbiditydifferential diagnosisepilepsyfunctionalnonepilepticpersonalitypsychogenicsemiologyvideo-EEG

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Area of Science:

  • Neurology
  • Clinical Neurophysiology

Background:

  • Psychogenic nonepileptic seizures (PNES) present diagnostic challenges.
  • A single clinical feature is insufficient for definitive PNES diagnosis.

Purpose of the Study:

  • To outline the evaluation process for diagnosing PNES.
  • To emphasize a multicomponent diagnostic approach for PNES.

Main Methods:

  • Evaluation relies on composite evidence: patient history, physical examination, seizure semiology, and electroencephalogram (EEG) findings.
  • Video-EEG monitoring is crucial but may not always capture events.
  • Utilizing all available evidence facilitates diagnosis.

Main Results:

  • No single feature definitively identifies PNES.
  • A comprehensive, multicomponent diagnostic strategy improves diagnostic reliability.
  • Patient-reported symptom identification is emerging as a valuable treatment component.

Conclusions:

  • Reliable diagnosis of PNES is achievable with current diagnostic methods and criteria.
  • A systematic, evidence-based approach is key to diagnosing and managing PNES.
  • Integrating patient-reported symptoms aids in PNES management.