Resetting tremor by single and paired transcranial magnetic stimulation in Parkinson's disease and essential tremor

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
Ming-Kuei LuChon-Haw Tsai

Abstract

The pathogenesis of tremor in Parkinson's disease (PD) and essential tremor (ET) is not fully understood. This study tested the role of primary motor cortex (M1), supplementary motor area (SMA) and cerebellar cortex on PD and ET tremor by single- and paired-pulse transcranial magnetic stimulation (TMS). Ten PD patients with resting tremor, six of them also with postural tremor, and ten ET patients with postural tremor were studied. Randomized single- and paired-pulse TMS with an interstimulus interval of 100 ms were delivered over M1, SMA and cerebellum. TMS effects were evaluated by calculating a tremor-resetting index (RI). Single- vs. paired-pulse TMS showed no difference. M1-TMS and SMA-TMS but not by cerebellar TMS induced a significant RI in PD and ET. M1-TMS resulted in a significantly higher RI in PD than ET. Furthermore, M1-TMS in PD but not in ET resulted in a significantly higher RI than SMA-TMS. Findings suggest a stronger involvement of M1 in resting and postural tremor in PD than postural tremor in ET. RI provides a useful marker to explore the differential functional role of M1, SMA and cerebellum in PD vs. ET tremor.

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Citations

Dec 5, 2015·Frontiers in Neuroscience·Moussa A ChalahSamar S Ayache
Jul 5, 2016·Neuroscience and Biobehavioral Reviews·Tetsuya AsakawaYing Xia
Mar 17, 2020·Movement Disorders : Official Journal of the Movement Disorder Society·Giorgio LeodoriAlfredo Berardelli
Dec 30, 2016·The Cerebellum·Kim van DunPeter Mariën

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