抄録
A brief review of the Z-test was given. The Z-test, devised by Ino, is a new method of caloric testing which can measure the renal latent time indicative of excitement in the labyrinth. By this test we can distinguish between central and peripheral diseases.
The author carried out this test on normal subjects and determined the normal value of this test, and then observed the results of testing 30 cases of Ménière's disease, 30 cases of atypical Ménière's disease and 12 cases of brain tumor.
For purposes of investigating the value of this test, the author carried out the experiments with rabbits, which was consisted of injury of cerebrum, cerebellum and labyrinth, experimental hydrops of labyrinthi, experimental D. P. due to the destruction of utriculus and sacculus.
The author studied comparatively this test before and after the injury of these vestibular apparatus. These experiments showed that the localization of vestibular lesions are more easily diagnosed by this test.
The direction of D. P. can be determined by the results of Z-test of both ears. The author made clear that a deep relationship was observed between D. P. and the results of Z-test.
In conclusion this test contributes much to local diagnosis of the diseased vestibular region.
