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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
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Epilepsy ll: Types01:22

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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.
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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.
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Seizures l: Introduction01:20

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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,...
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Encephalitis l: Introduction01:19

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Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
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Alterations in Muscle Tone ll01:12

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Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
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Movement Disorders in Developmental and Epileptic Encephalopathies.

Shekeeb Mohammad1,2, Darius Ebrahimi-Fakhari3, Hugo Morales-Briceno1,4

  • 1Faculty of Medicine and Health, Sydney Medical School, The University of Sydney, Sydney, NSW, Australia.

Movement Disorders Clinical Practice
|May 2, 2026
PubMed
Summary
This summary is machine-generated.

Movement disorders are common in developmental and epileptic encephalopathies (DEE), often presenting as hyperkinetic symptoms. A syndrome-based approach using genetic testing guides management for these complex epilepsy-dyskinesia syndromes (EDS).

Keywords:
DEEdyskinesiaepilepsy

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Area of Science:

  • Neurogenetics
  • Epileptology
  • Movement Disorders

Background:

  • Monogenic developmental and epileptic encephalopathies (DEE) frequently involve co-occurring movement disorders.
  • Gene discovery has expanded epilepsy-dyskinesia syndromes (EDS), linking genes to specific phenotypes like stereotypies or paroxysmal dyskinesia.

Purpose of the Study:

  • Outline the spectrum of movement disorders in EDS.
  • Propose a clinical framework for EDS based on syndromes.
  • Group genes by mechanism and highlight genotype-phenotype correlations.
  • Summarize therapeutic options for EDS.

Main Methods:

  • Conducted a structured literature review of monogenic disorders associated with EDS.
  • Grouped publications into four tiers based on study type.
  • Identified 245 single-gene associations, primarily related to ion channels and synaptic signaling.

Main Results:

  • Movement disorders affect 25-50% of DEE patients, often hyperkinetic (dystonia, stereotypies) and multifactorial.
  • Clinical presentations were categorized into distinct EDS phenotypes.
  • Treatments involve gene- and mechanism-informed strategies, including medications and deep brain stimulation.

Conclusions:

  • Movement disorders are prevalent, severe, and genetically diverse in EDS.
  • A syndrome-based approach combining clinical data, neuroimaging, and genetic testing is crucial.
  • This approach aids in managing symptoms and implementing precision therapies for EDS.