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Updated: Jun 15, 2025

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Stiff person syndrome.

Patrick W Cullinane1, Aisling S Carr2, Sarosh R Irani3

  • 1Reta Lila Weston Institute of Neurological Studies, Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom.

Handbook of Clinical Neurology
|August 22, 2024
PubMed
Summary
This summary is machine-generated.

Stiff Person syndrome (SPS) is a rare autoimmune disorder affecting the central nervous system. Research is ongoing to understand the role of autoantibodies and improve treatments beyond diazepam and baclofen.

Keywords:
GABAGAD autoimmunityGlycineProgressive encephalomyelitis with rigidity and myoclonusStiff person syndrome

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Area of Science:

  • Neurology
  • Immunology
  • Autoimmune Disorders

Background:

  • Stiff Person syndrome (SPS) is a rare autoimmune central nervous system disorder.
  • Characterized by muscle stiffness, spasms, and nonmotor symptoms like anxiety and depression.
  • SPS exists on a spectrum, including stiff limb syndrome and progressive encephalomyelitis with rigidity and myoclonus.

Purpose of the Study:

  • To review the current understanding of Stiff Person syndrome spectrum disorders.
  • To discuss associated autoantibodies and their uncertain role in pathogenesis.
  • To outline current and potential future treatment strategies.

Main Methods:

  • Literature review of Stiff Person syndrome spectrum disorders.
  • Analysis of associated autoantibodies and their targets.
  • Evaluation of current and emerging therapeutic interventions.

Main Results:

  • SPS spectrum disorders share core clinical features and autoantibodies targeting neuronal proteins.
  • Glutamic acid decarboxylase antibodies are common, but others like glycine receptor and GABAAR antibodies are also implicated.
  • Diazepam and baclofen are first-line treatments; immunotherapy, particularly IVIg, shows promise for non-responders.

Conclusions:

  • Further research is needed to clarify the role of autoantibodies in SPS pathogenesis.
  • Optimizing immunotherapy and exploring novel treatments are crucial for managing this disabling condition.