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To the Editor:
Hashimoto et al.1 investigated motor evoked potentials (MEP) of the paraspinal muscles after magnetic stimulation of the motor cortex in seven volunteers, five patients with MS, and four patients with HTLV-1–associated myelopathy. The authors state that “there are no published papers studying paraspinal MEP after transcranial magnetic stimulation.” We previously described this approach in 30 controls and 30 patients with MS in two consecutive papers2,3⇓ that were not considered by the authors. The stimulation and recording technique described by Hashimoto et al.1 is nearly identical to that used in our investigations. We also recorded from the monosegmentally innervated multifidus muscles at the cervical (C7) and thoracolumbar (Th12/L1) vertebral levels with Macro-EMG needle electrodes. Using slight preactivation, we recorded reproducible, polyphasic EMG …
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