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• Vol.42 No.9
• CLINICA NEUROL, 42: 859−863, 2002
• Vol.42 No.9 contents

Case Report

A case of myelopathy of unknown etiology with transient spinal automatism -Electrophysiological study

Yasuhiro Kagamihara, M.D.¹⁾, Manabu Wada, M.D.³⁾, Tetsuo Komori, M.D.¹⁾, Toshio Shimizu, M.D.¹⁾ and Mieko Shinomiya, Ph.D²⁾

¹⁾Department of Neurology, Tokyo Metropolitan Neurological Hospital
²⁾Department of Clinical Neurophysiology, Tokyo Metropolitan Neurological Hospital
³⁾Third Department of Internal Medicine, Yamagata University School of Medicine

We reported a case of myelopathy of unknown etiology with transient spinal automatism. A 50-years old woman suffered from gait disturbace with weakness and abnormal involuntary movement of both lower limbs. The involuntary movement showed like as triple flexion reflex and appeared in the interval between some seconds and some ten seconds. It was consisted of non-reciprocal phasic-tonic discharges. In electrophysiological examination, long latency muscular responses were observed following F wave and MEP (motor evoked potential) in the abductor hallucis muscle. Excitability of motoneurons of lower limb muscles following stimulation of sural nerve was evaluated by means of H reflex and averaged surface EMGs. Short latency facilitation was induced in the soleus and tibialis anterior muscles contrary to inhibition in the control subjects. In this case, reduced activity of inhibitory and/or enhanced activity of excitatory interneurons to motoneurons attributed to the pathophysiology of spinal automatism.

(CLINICA NEUROL, 42: 859−863, 2002)
key words: spinal automatism, cutaneous reflex, flexion reflex, spinal interneurons

(Received: 6-Sep-02)