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A Simple Cell-based Immunofluorescence Assay to Detect Autoantibody Against the N-Methyl-D-Aspartate (NMDA) Receptor in Blood
07:20

A Simple Cell-based Immunofluorescence Assay to Detect Autoantibody Against the N-Methyl-D-Aspartate (NMDA) Receptor in Blood

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[Fast and spectacular clinical response to plasmapheresis in a paediatric case of anti-NMDA encephalitis]

N Nunez-Enamorado1, A Camacho-Salas, S Belda-Hofheinz

  • 1Hospital Universitario 12 de Octubre, Madrid, Espana. noenu_enamorado@yahoo.es

Revista De Neurologia
|March 28, 2012
PubMed

Insights

Autoimmune encephalitis against N-methyl-D-aspartate (NMDA) receptors is increasingly diagnosed in children. Early recognition and immunotherapy, particularly plasmapheresis, are crucial for treating this potentially reversible neurological disorder.

Area of Science:

  • Pediatric Neurology
  • Neuroimmunology

Background:

  • Autoimmune encephalitis targeting N-methyl-D-aspartate (NMDA) receptors is increasingly recognized in pediatric populations.
  • Suspected in children presenting with psychiatric symptoms, encephalopathy, movement disorders, or seizures.

Observation:

  • A 2.5-year-old boy presented with subacute encephalopathy, seizures, behavioral changes, neurological regression, dyskinesias, and insomnia.
  • Initial treatments with corticosteroids and IVIG were ineffective; however, plasmapheresis led to rapid and significant recovery.
  • Cerebrospinal fluid was normal, MRI showed focal periventricular lesions and leptomeningeal enhancement, and EEG indicated diffuse delta activity with epileptiform discharges.

Findings:

  • The patient tested positive for antibodies against the NMDA receptor.
  • Plasmapheresis resulted in a swift and dramatic clinical improvement.
  • Long-term follow-up showed mild residual behavioral and language alterations without relapse or need for maintenance therapy.

Implications:

  • Anti-NMDA receptor encephalitis is a treatable condition, emphasizing the importance of early diagnosis.
  • Immunotherapy, including plasmapheresis, is effective for non-paraneoplastic cases, offering rapid recovery.
  • This case highlights the potential for significant neurological recovery with prompt and appropriate treatment in pediatric autoimmune encephalitis.
Abstract

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