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Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
Published on: February 23, 2020
Myoclonus and transcranial magnetic stimulation
1Service de physiologie, explorations fonctionnelles, hôpital Henri-Mondor, Assistance publique-Hôpitaux de Paris, 51, avenue du Marechal-Lattre-de-Tassigny, 94010 Créteil, France. jean-pascal.lefaucheur@hmn.aphp.fr
Neurophysiologie Clinique = Clinical Neurophysiology
|March 6, 2007
Summary
Transcranial magnetic stimulation (TMS) reveals reduced intracortical inhibition in myoclonus. Low-frequency repetitive TMS (rTMS) may alleviate symptoms by restoring this inhibition, offering new therapeutic possibilities for motor cortex hyperexcitability.
Area of Science:
- Neuroscience
- Neurology
- Clinical Neurophysiology
Background:
- Myoclonus involves neural dysfunction potentially originating in motor cortices.
- Transcranial magnetic stimulation (TMS) assesses motor cortex excitability and inhibitory/excitatory balance.
- Understanding pathophysiological mechanisms of myoclonus is crucial for effective treatment.
Purpose of the Study:
- To investigate the role of intracortical inhibition in different types of myoclonus using TMS.
- To explore the potential of repetitive TMS (rTMS) as a therapeutic intervention for myoclonus.
Main Methods:
- Paired-pulse TMS paradigms with varying interstimulus intervals were used.
- Intracortical inhibition (ICI), transcallosal inhibition, and sensorimotor integration were assessed.
- Low-frequency (around 1 Hz) repetitive TMS (rTMS) was considered for therapeutic application.
Main Results:
- Reduced ICI was observed in progressive myoclonic epilepsy (PME).
- In juvenile myoclonic epilepsy (JME), ICI was decreased only at short interstimulus intervals.
- Transcallosal inhibition and sensorimotor integration were altered in PME, but not JME.
- Other TMS excitability parameters were generally normal.
Conclusions:
- Loss of central nervous system inhibitory regulation may underlie myoclonus.
- Low-frequency rTMS shows promise in alleviating myoclonic symptoms by restoring ICI.
- rTMS offers potential therapeutic perspectives for myoclonus related to motor cortical hyperexcitability.
