Caloric Pattern Test with Special Reference to Failure of Fixation-Suppression

I. Kato Department of Otolaryngology, Yamagata University, Japan

Y. Sato Departments of Otolaryngology, Niigata University, Japan

M. Aoyagi Department of Otolaryngology, Yamagata University, Japan

K. Mizukoshi Departments of Otolaryngology, Niigata University, Japan

Y. Kimura Department of Otolaryngology, Yamagata University, Japan

Y. Koike Department of Otolaryngology, Yamagata University, Japan

N. Hayano Departments of Neurosurgery, Niigata University, Japan

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Abstract

Fixation-suppression of caloric nystagmus was studied in 1230 consecutive cases. An analysis of caloric nystagmus with failure of fixation-suppression (FFS) made it possible to classify patterns of FFS into three types: Type I: FFS was observed bilaterally in caloric nystagmus; Type II: FFS was recognized unilaterally on either side; Type III: FFS was seen in either direction of nystagmus. On the basis of these three types, the underlying neuroanatomical substrate responsible for FFS is discussed.

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Caloric Pattern Test with Special Reference to Failure of Fixation-Suppression

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Caloric Pattern Test with Special Reference to Failure of Fixation-Suppression

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