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[Autoimmune and Epilepsy].

Riki Matsumoto1, Mitsuhiro Sakamoto, Akio Ikeda

  • 1Departments of Neurology, Kyoto University Graduate School of Medicine.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|October 19, 2017
PubMed
Summary

Autoimmune epilepsy, linked to antibodies targeting neuronal proteins like NMDAR, presents with refractory seizures and potential encephalitis symptoms. Early immunotherapy is crucial for seizure control and preventing severe neurological outcomes.

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Area of Science:

  • Neurology
  • Immunology
  • Epileptology

Background:

  • Discovery of autoimmune antibodies targeting neuronal proteins (e.g., NMDAR, LGI1) suggests autoimmune epilepsy as a distinct etiology.
  • Autoimmune epilepsy is often a forme fruste of autoimmune (limbic) encephalitis, characterized by subacute onset seizures refractory to standard treatment.

Purpose of the Study:

  • To highlight the clinical features and diagnostic considerations for autoimmune epilepsy.
  • To emphasize the importance of early immunotherapy in managing autoimmune epilepsy and preventing severe encephalitis.

Main Methods:

  • Clinical observation and diagnostic criteria for autoimmune epilepsy.
  • Review of antibody testing, neuroimaging (MRI), metabolic imaging (FDG-PET), electroencephalography (EEG), and cerebrospinal fluid (CSF) findings.
  • Assessment of immunotherapy response in patients with autoimmune epilepsy.

Main Results:

  • Seizures in autoimmune epilepsy are typically subacute and drug-resistant, with varied semiologies including autonomic and faciobrachial dystonic seizures.
  • Clinical diagnosis is supported by evidence of central nervous system (CNS) inflammation (abnormal MRI, PET, EEG, CSF) even before antibody test results.
  • Some patients exhibit a smoldering, chronic course with mild symptoms, underscoring the need for biomarkers of CNS inflammation.

Conclusions:

  • Autoimmune epilepsy requires consideration in patients with refractory seizures, especially when CNS inflammation is evident.
  • Early and intensive immunotherapy can lead to seizure remission and prevent progression to full autoimmune encephalitis.
  • Further research into biomarkers for CNS inflammation is needed for tailored immunotherapy in both acute and chronic phases, particularly for antibody-negative cases.

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