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INDUCED EXACERBATION OF PARKINSONIAN RIGIDITY:Part 1 : Clinical & Electromyographical Investigation Keizo MATSUMOTO 1 12nd Dept. of Surgery, Osaka Univ. Medical School pp.467-472
Published Date 1964/6/1
DOI https://doi.org/10.11477/mf.1406201651

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  • Abstract
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Recent increasing interest in basal ganglia surgery for tremor and rigidity in parkinsonism would seem to warrant more critical measures for evaluation of these symptoms, not only for the purpose of assess-ment of surgical results but also to elucidate the underlying neurologic mechanisms. A total of 197 parkinsonians were investigated for rigidity by clini-cal examinations with and without asynkinetic and asynchronous contralateral voluntary movement. Marked exaggeration of rigidity was observed in 82%. 113 parkinsonians and 20 normal controls were investigated electromyographically. In normal per-sons or postoperative parkinsonians, who had com-plete alleviation of rigidity, no stretch discharge is elicited with or without this maneuver. All pre-operative patients and postoperative ones who had incomplete alleviation of rigidity, stretch discharges were readily demonstrated by the contralateral move-ment. Electromyographical studies further sub-stantiate this maneuver both for confirmation of the diagnosis as well as the evaluation of surgical results.

Pathophysiologic mechanism of this phenomenon would seem to be related with the central activation to gamma system, not due to proprioceptive input from the contralateral limbs. However, the precise role at the gamma system in reinforcement of rigidi-ty by the contralateral maneuver is not yet certain.


Copyright © 1964, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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