Idiopathic cortical myoclonus restricted to the lower limbs: Correlation between MEPs and 99mTc-ECD single photon emission computed tomography activation study

Kimihiro Tanaka, Ri E. Suga, Takeshi Yamada, Shozo Tobimatsu, Masayuki Sasaki, Yasuo Kuwabara, Hirokazu Furuya, Takuro Kobayashi, Jun Ichi Kira

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Abstract

We report a 63-year-old woman with cortical reflex myoclonus restricted to the bilateral lower limbs. Somatosensory evoked cortical potentials to posterior tibial nerve stimulation were enlarged with C-responses. Jerk- locked back averaging of the EEG identified a cortical spike related to myoclonic jerks. Motor evoked potentials recorded from the abductor hallucis muscle showed an exaggerated late response. These findings suggest hyperexcitability of the sensorimotor cortex. 99mTc-ECD single photon emission computed tomography (SPECT) after stimulation of the posterior tibial nerve showed increased perfusion in the contralateral peri-Rolandic area which corresponded to the hyperexcitable region. ASPECT activation study as well as MEPs therefore can be employed to determine the hyperexcitable region in cortical myoclonus.

Original languageEnglish
Pages (from-to)58-60
Number of pages3
JournalJournal of the Neurological Sciences
Volume163
Issue number1
DOIs
Publication statusPublished - Feb 1 1999

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All Science Journal Classification (ASJC) codes

  • Neurology
  • Clinical Neurology

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