Of 143 appoplectic patients who were studied by neuro-otological tests, 50 cases whose cerebral lesions were detected by cerebral angiography, brain scintigraphy and neurological examinations, were selected for the following investigations;
1) The relationship between affected site of the brain and abnormal neuro-otological findings.
2) Diagnostic significance of neuro-otological tests for evaluating the sequela of apoplexy.
3) Diagnostic significance of neuro-otological tests for the detection of abnormality of vestibular system in the brain stem, especially the supratentorial lesion.
The results obtained were as follows:
1) Nystagmus was observed in approximately half the cases of cerebral hemorrhage without distinct difference between lateral and combined type.This is presumably due to the secondary effect on the brain stem.
2) In optokinetic pattern test(OKP test), the abnormal findings were observed more frequently in the combined type of cerebral hemorrhage than in the lateral type.It is useful to localize the site of hemorrhage.
3) In about half the cases of cerebral hemorrhage, abnormal findings were obtained in interaural differentiation test in both lateral and combined type.The abnormality in the interaural differentiation test suggests the extension of the lesion and if aphasia developed, the site of hemorrhage extends beyond the cerebral subcortex to the cerebral cortex.
4) Nystagmus was observed in more than half the cases of cerebral infarction, but no definite correlation was recognized between the occlusion site and appearance of any special type of nystagmus.
5) The OKP findings were abnormal in all patients with the major cerebral artery occlusion.This is due to the size of cerebral infaction in the cerebral hemisphere.
6) In many patients OKP test and interaural differentiation test could not performed.This probably due to the size of the supratentorial lesion.
From these results, it is concluded that the vestibular and auditory function tests as well as the neurological tests may be useful in the diagnosis of exact site and extension of the cerebral lesion, and to find out the presence and degree of brain stem lesion, and to presume the prognosis of the apoplectic patients
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