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pp.189-192
Published Date 1952/5/20
DOI https://doi.org/10.11477/mf.1492200661

TAKAHASHI notes that in comparison of nystagmuses produced by caloric stimulations with head positions in varied attitude such as, upright, supine and prone, the one which might be elici-ted by lateral position with 10cc. or 2cc. of water at 5 degrees centigrade instilled to the upper ear will he often characterized by being rotatory in nature, though the rate and amplitude may be somewhat lesser in degree. Such a nystagmus will be reversed in the direction of its fast component after a lapse of a certain period of time. The author designates this reversal as the "second phase" of caloric nystagmus. With lateral head pcsition the onset of the second phase is most likely seen after the initial nystagmus had completely ceased to exist.Even when the upper ear is stimulated with conti-nuous irrigation of 300cc. of water at 5 degrees centigradl rotatory nystagmus occurs in about 2 minutes and in about 3 minutes its direction will be reversed.


Copyright © 1952, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 印刷版ISSN 0386-9679 医学書院

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