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From the National Center for Nervous, Mental and Muscular Disorders, Tokyo, Japan.
We studied a patient with action-induced rhythmic dystonia that followed a stroke. Postmortem studies showed an infarct in the right posterolateral ventral part of the thalamus. Electrophysiologic analysis indicated that the eliciting factor of the involuntary movement was an impulse, promoting voluntary contraction of muscle. CSF 5-HIAA content was low, and HVA was high. Administration of 5-HTP and clonazepam abolished the involuntary movements.
Address correspondence and reprint requests to Dr. Sunohara, National Center for Nervous, Mental and Muscular Disorders, 2620, Ogawa-Higashi-Machi, Kodaira, Tokyo, Japan, 187.
Accepted for publication June 16, 1983.
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