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Hyponatraemia caused by LGI1-associated limbic encephalitis.

Rory F McQuillan1, Joanne M Bargman1

  • 1Division of Nephrology, University Health Network, Toronto, Canada.

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|May 19, 2015
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Summary

Autoimmune limbic encephalitis (LE) is increasingly diagnosed without cancer. Anti-leucine-rich anti-glioma 1 protein (anti-LGI1) LE often presents with severe hyponatraemia, complicating diagnosis and treatment.

Keywords:
IVIGhyponatraemialimbic encephalitis

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Area of Science:

  • Neurology
  • Immunology
  • Nephrology

Background:

  • Limbic encephalitis (LE) was historically considered rare and paraneoplastic.
  • Autoimmune LE is now recognized as a distinct clinical entity.
  • Advances in autoantibody testing have increased LE diagnoses.

Observation:

  • Autoantibodies targeting neuronal cell surface proteins are key diagnostic markers.
  • The leucine-rich anti-glioma 1 protein (LGI1) is a recently identified target.
  • LGI1 is crucial for synaptic transmission and also found in kidney tubules.

Findings:

  • Anti-LGI1 LE involves subacute neurological, cognitive, and psychiatric decline.
  • Severe hyponatraemia complicates up to 60% of anti-LGI1 LE cases.
  • Hyponatraemia can mimic or obscure the primary neurological diagnosis.

Implications:

  • Increased recognition of autoimmune LE broadens diagnostic possibilities.
  • Identifying anti-LGI1 antibodies aids in specific diagnosis and management.
  • Understanding the link between anti-LGI1 LE and hyponatraemia is critical for patient outcomes.