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Changes in motor cortex excitability in facioscapulohumeral muscular dystrophy
V Di Lazzaro1, A Oliviero, P A Tonali
1Institute of Neurology, Università Cattolica, Largo A. Gemelli 8, Rome 00168, Italy. vdilazzaro@rm.unicatt.it
Neuromuscular Disorders : NMD
|December 9, 2003
Summary
Facioscapulohumeral muscular dystrophy (FSHD) patients show reduced motor cortex inhibition, indicating central nervous system changes even in milder forms. This study highlights potential neurological involvement beyond muscle weakness in FSHD.
Area of Science:
- Neuroscience
- Neuromuscular Disorders
- Clinical Neurophysiology
Background:
- Severe facioscapulohumeral muscular dystrophy (FSHD) is linked to central nervous system (CNS) issues like epilepsy.
- It remains unclear if milder FSHD forms also exhibit CNS functional changes.
Purpose of the Study:
- To investigate potential alterations in motor cortex neuronal network excitability in FSHD patients.
- To compare CNS function in FSHD patients with healthy controls and patients with other muscle diseases.
Main Methods:
- Utilized transcranial magnetic stimulation (TMS) paradigms to assess motor cortex excitability.
- Examined 20 FSHD patients with varying disease severity, 20 healthy controls, and 6 patients with other muscle diseases.
Main Results:
- FSHD patients exhibited significantly reduced intracortical inhibition compared to controls (P=0.025).
- Reduced inhibition was also significant compared to patients with other muscle diseases (P=0.046).
- No significant difference in inhibition was observed between healthy controls and patients with other muscle diseases (P=0.970).
Conclusions:
- The findings suggest impaired motor cortex function in FSHD patients, irrespective of disease severity.
- This indicates a potential CNS involvement in the pathophysiology of facioscapulohumeral muscular dystrophy.