Immediate Reduction in Spasticity of Ankle Plantar Flexors in a Stroke Patient after Treatment with a Spinning Permanent Magnet Device

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  • Matsuura Hirotaka
    Department of Rehabilitation Medicine, School of Medicine, Fujita Health University, Toyoake, Japan
  • Aoyagi Yoichiro
    Department of Rehabilitation Medicine, School of Medicine, Fujita Health University, Toyoake, Japan Department of Rehabilitation Medicine, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan
  • Nomura Makoto
    Department of Rehabilitation Medicine, Nippon Medical School Chiba Hokusoh Hospital, Inzai, Japan
  • Sasa Naoki
    Department of Rehabilitation Medicine, Nippon Medical School Chiba Hokusoh Hospital, Inzai, Japan
  • Mizuno Emi
    Department of Rehabilitation Medicine, Nippon Medical School Chiba Hokusoh Hospital, Inzai, Japan
  • Wada Yuji
    Department of Rehabilitation Medicine, Nippon Medical School Chiba Hokusoh Hospital, Inzai, Japan
  • Kagaya Hitoshi
    Department of Rehabilitation Medicine, School of Medicine, Fujita Health University, Toyoake, Japan Department of Rehabilitation Medicine, National Center for Geriatrics and Gerontology, Obu, Japan

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<p>Background: Magnetic stimulation devices can be large because of the need for cooling systems. We developed a compact and lightweight Spinning Permanent Magnet (SPM) device that generates magnetic fields with intensities below the motor threshold. In this report, we present the case of a post-stroke patient in which an immediate reduction in spasticity of the ankle plantar flexors was achieved after SPM treatment.</p><p>Case: A 37-year-old man was admitted to our hospital with a right putamen hemorrhage. The patient underwent conservative therapy and exhibited residual left hemiplegia and spasticity. Three months after stroke onset, he was able to walk with supervision while using a left ankle–foot orthosis and a T-cane. The Modified Ashworth Scale (MAS) score of the left ankle plantar flexors was 1+. The plantar flexors were stimulated by SPM treatment. The outcomes were the Hmax/Mmax of the tibial nerve (soleus muscle) and the MAS score. On the first day, SPM stimulation was applied for 30 min. On the second day, a sham stimulation of the same duration was performed. On the third day, the SPM stimulation was repeated. Hmax/Mmax decreased from 41.5% to 37.7% on the first day, and from 46.9% to 31.6% on the third day after SPM stimulation. The MAS score decreased from 1+ to 1 on both days. In contrast, after sham stimulation, Hmax/Mmax increased from 39.2% to 44.2%, whereas the MAS score remained unchanged at 1+.</p><p>Discussion: Stimulation below the motor threshold using SPM treatment can effectively reduce spasticity.</p>

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