視運動性眼振検査結果の分類と経時的観察法に関する研究

抄録

The test for optokinetic nystagmus in the examination of vestibular function plays an important role in diagnosis of diseases of the peripheral vestibule and central nervous system.
Many cases of cerebral apoplexy show abnormality in optokinetic nystagmus, but studies dealing with a chronological change in optokinetic nystagmus are scanty.
In this study we made observations on the degree of chronological changes in OKP in 50 cases of cerebral apoplexy with hemiplegia.
Methods for evaluating the results of OKP test are mostly qualitative and few use the quantitative expression.
It was therefore difficult to express and compare the clinical course in patients with abnormal OKP.
In our study, chronological changes in OKP were at first evaluated in 5 grades by four judges.
The four judges agreed in evaluation in extreme changes but disagreed in the shifting type in many cases.
Then we attempted to work out a pattern which serves as a criterion for evaluation of OKP, to compare it with OKP of the patient and to express the extent of OKP abnormality in the numerical figure.
Fifty OKP showing various patterns were selected from patients with cerebral apoplexy reported in the past several years in order to make standardized OKP which serves as a criterion.
On the basis of this criterion, OKP was divided into three groups: Group I which shows a normal or near normal pattern, Group II which shows a slightly abnormal pattern, Group III which shows a definitely abnormal pattern.
Furthermore, the group was subdivided into a, b and c.
Using such a criterion, we examined chronological changes in OKP in 50 cases of cerebral apoplexy mentioned earlier.
As a result, OKP in patients with cerebral apoplexy remained almost unchanged even in reexamination after the lapse of time.
The changes were mostly those within the same group. Few cases showed changes from one group to another.