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Cerebellar dysfunction in progressive supranuclear palsy: a transcranial magnetic stimulation study.
Yuichiro Shirota1, Masashi Hamada, Ritsuko Hanajima
1Department of Neurology, Division of Neuroscience, Graduate School of Medicine, University of Tokyo, Tokyo, Japan. yshirota-tky@umin.ac.jp
Movement Disorders : Official Journal of the Movement Disorder Society
|September 7, 2010
Summary
Subclinical cerebellar dysfunction, assessed via transcranial magnetic stimulation (TMS)-induced cerebellar inhibition (CBI), is present in progressive supranuclear palsy (PSP) patients. This finding aligns with pathological evidence of cerebellar degeneration in PSP.
Area of Science:
- Neuroscience
- Neurology
- Clinical Neurophysiology
Background:
- Progressive supranuclear palsy (PSP) involves cerebellar pathology, particularly in the dentate nuclei, yet typically lacks overt cerebellar symptoms.
- Understanding subclinical cerebellar involvement is crucial for diagnosing and managing PSP.
Purpose of the Study:
- To evaluate cerebellar function in PSP patients using transcranial magnetic stimulation (TMS).
- To determine if subclinical cerebellar involvement is detectable in PSP using cerebellar inhibition (CBI).
Main Methods:
- Assessed cerebellar inhibition (CBI) in 11 PSP patients, 11 Parkinson's disease (PD) patients, and 10 controls using TMS.
- Measured motor evoked potentials (MEPs) from hand muscles.
- Analyzed the time course of CBI using interstimulus intervals (ISIs) of 4-8 ms.
Main Results:
- Cerebellar inhibition (CBI) was significantly reduced in PSP patients compared to controls.
- CBI was normal in Parkinson's disease (PD) patients in their medication 'on' state.
- The findings suggest involvement of Purkinje cells or the dentato-thalamo-cortical pathway in PSP.
Conclusions:
- Subclinical cerebellar dysfunction is detectable in PSP patients using TMS-based CBI.
- Results correlate with pathological findings of dentate nucleus degeneration in PSP.
- Further research should investigate CBI in PD patients' medication 'off' state.
