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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:
341
Autoimmune Disorders01:29

Autoimmune Disorders

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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune...
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Arteries of the Lower Limbs01:24

Arteries of the Lower Limbs

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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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Myasthenia Gravis: Overview and Treatment01:20

Myasthenia Gravis: Overview and Treatment

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Myasthenia gravis is a neuromuscular transmission disorder characterized by weakness and increased fatigability of skeletal muscles. It is an autoimmune disease affecting approximately one in 2000 people, where antibodies against the α1 subunit of nicotinic acetylcholine receptors are produced.
These antibodies interfere with the function of the nicotinic receptors in three ways: by binding to the receptor and disrupting acetylcholine binding; by causing cross-linking of receptors which...
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Antiepileptic Drugs: Glutamate Antagonists01:14

Antiepileptic Drugs: Glutamate Antagonists

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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...
342
Antiepileptic Drugs: GABAergic Pathway Potentiators01:18

Antiepileptic Drugs: GABAergic Pathway Potentiators

396
γ-aminobutyric acid or GABA, plays a pivotal role as an inhibitory neurotransmitter in the brain. GABA pathway potentiators, also known as GABAergic drugs, are a class of pharmaceutical agents designed to enhance the functioning of the GABAergic system. These medications primarily treat epilepsy, a neurological disorder characterized by recurrent seizures.
The key GABA pathway potentiators used in epilepsy management are as follows.
Benzodiazepines are a well-known class of drugs used for...
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Autoimmune and paraneoplastic seizures.

Barbara Wagner1, Sarosh Irani2

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Summary

Autoimmune encephalitis frequently causes seizures, particularly those targeting LGI1, CASPR2, NMDA, GABAB, and GABAA receptors. Early diagnosis and immunotherapy are key for better outcomes in these autoimmune-related seizure disorders.

Keywords:
Acute symptomatic seizures secondary to autoimmune encephalitisAutoimmune encephalitisAutoimmune epilepsyAutoimmune seizuresFaciobrachial dystonic seizuresImmunotherapy

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Area of Science:

  • Neuroimmunology
  • Epileptology

Background:

  • Seizures are a common and significant manifestation of autoimmune encephalitis.
  • Prevalence is high in patients with antibodies against LGI1, CASPR2, NMDA, GABAB, and GABAA receptors.

Approach:

  • Discusses classification, clinical presentation, investigation, and treatment of autoantibody-mediated illnesses.
  • Highlights seizure semiologies aiding clinical diagnosis of autoimmune-associated syndromes.
  • Classifies syndromes based on causative autoantibodies or T-cell mediation and distinguishes acute symptomatic seizures from autoimmune-associated epilepsy.

Key Points:

  • Emphasizes superior immunotherapy response in patients with causative autoantibodies.
  • Reviews emerging evidence for first-, second-, and third-line immunotherapies.
  • Highlights clinical rating scales for guiding autoantibody testing and immunotherapy in unexplained seizures.

Conclusions:

  • Relates clinical and therapeutic observations to the underlying immunobiology and neuroscience driving seizures.
  • Distinguishing acute symptomatic seizures from autoimmune-associated epilepsy is crucial for management and relates to pathogenesis.