眼振急速相分析における諸問題の検討

概要

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In the present study, the values of parameters, such as peak velocity and amplitude of the fast phase of optokinetic nystagmus (OKN), were measured quantitatively in 5 normal subjects by a microcomputer, and the effects of several methodological factors on nystagmus parameters were investigated.<BR>1) The relationship between peak velocities and amplitude of the fast phase of OKN could be obtained from a bestfit exponential equation, i. e., velocity=K (1-exp [-amplitude/L]), where K is the asymptotic maximum velocity and L is a curvature parameter.<BR>2) Analog filters with highcutoff frequencies affected the computation of peak velocities of the fast phase of OKN. The results showed that the analog filter should be about 10Hz or higher.<BR>3) Sampling frequencies influenced the velocity of the fast phase of OKN, and it was shown that the analog data should be digitized at a rate of 200 samples/sec or more.<BR>4) It was recognized that the value of the velocity at each amplitude obtained from a best-fit exponenntial equation could be used as an index for the evaluation of the fast phase of OKN.
一般社団法人日本めまい平衡医学会の論文