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Autoimmune Encephalitis Criteria in Clinical Practice.

Emma Orozco1, Cristina Valencia-Sanchez1, Jeffrey Britton1

  • 1Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL.

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Summary
This summary is machine-generated.

The 2016 autoimmune encephalitis (AE) criteria are highly specific for subacute encephalopathy but could be expanded. Including AE-IgG-positive patients with isolated seizures or brainstem disorders may improve diagnostic inclusion.

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Area of Science:

  • Neurology
  • Immunology
  • Clinical Medicine

Background:

  • Autoimmune encephalitis (AE) is a group of disorders characterized by inflammation of the brain due to autoimmune processes.
  • Accurate diagnostic criteria are essential for timely and effective treatment.

Purpose of the Study:

  • To evaluate the clinical applicability of the 2016 autoimmune encephalitis (AE) criteria.
  • To identify potential improvements for diagnosing AE in clinical practice.

Main Methods:

  • Retrospective review of medical records for 538 adult patients diagnosed with AE or related autoimmune encephalopathy at Mayo Clinic.
  • Application of the 2016 AE guideline criteria to the patient cohort.

Main Results:

  • 67% of patients met the criteria for possible AE, with 61% classified as definite AE.
  • The most common definite AE subtypes included limbic encephalitis and anti-NMDA-receptor encephalitis.
  • LGI1, NMDA-R, and GAD65 were the most frequently detected AE-specific antibodies.
  • 33% of patients did not meet possible AE criteria, including those with seizures only or brainstem encephalitis.
  • A significant proportion of patients not meeting criteria showed evidence of other autoimmunity and responded to immunotherapy.

Conclusions:

  • The 2016 AE guidelines are specific for subacute encephalopathy but may exclude certain AE presentations.
  • Expanding criteria to include AE-IgG-positive patients with isolated seizures or brainstem disorders could enhance diagnostic yield.
  • Atypical AE presentations with supportive autoimmune findings may benefit from immunotherapy.