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The stiff man and stiff man plus syndromes
1National Hospital for Neurology and Neurosurgery, and the MRC Human Movement and Balance Unit, Institute of Neurology, London WC1N 3BG, UK.
Journal of Neurology
|August 25, 1999
Summary
Stiff-person syndrome involves continuous motor unit activity causing rigidity. Classical stiff-person syndrome, often linked to glutamic acid decarboxylase antibodies, has an excellent prognosis, unlike related syndromes with
Area of Science:
- Neurology
- Immunology
- Autoimmune Disorders
Background:
- Continuous motor unit activity at rest can cause rigidity due to central or peripheral conditions.
- Painful reflex spasms suggest a central origin for rigidity.
- Imaging and serological studies help exclude focal spinal lesions and infections.
Purpose of the Study:
- To differentiate classical stiff-person syndrome from related conditions.
- To investigate the diagnostic criteria, etiology, and prognosis of stiff-person syndrome and related disorders.
Main Methods:
- Clinical evaluation including assessment of rigidity patterns (axial vs. distal).
- Serological testing for antibodies against glutamic acid decarboxylase.
- Review of post-mortem pathology findings in encephalomyelitis cases.
Main Results:
- Classical stiff-person syndrome is characterized by axial rigidity and often associated with glutamic acid decarboxylase antibodies (90% of cases).
- Patients with 'plus' signs, especially distal limb rigidity, have poorer prognoses and treatment responses, suggesting different underlying pathologies.
- Related syndromes include paraneoplastic or autoimmune encephalomyelitis, presenting as subacute, chronic brainstem, or spinal cord involvement.
Conclusions:
- Classical stiff-person syndrome has a distinct clinical presentation and excellent prognosis.
- Stiff persons with 'plus' signs represent a heterogeneous group, often with encephalomyelitis, requiring different management strategies.
- Understanding these distinctions is crucial for accurate diagnosis, treatment, and prognosis in patients with continuous motor unit activity and rigidity.