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Trapezoid acceleration tests(±2, 4, 8 and 10°/sec2, 10")using the Contraves'computerized rotary chair system were performed for 60 normal persons and 129 patients with aural vertigo. Maximum value of slow phase velocity (SPV) and duration of perrotatory nystagmus were investigated as diagnostic parameters.In normal subjects, the value of SPV as well as nystagmus-duration showed few differences between accelerative stimulation and decelerative stimulation. So-called "Response Decline Phenomenon" by repeating the test was not detected and the testing results showed good reproducibilities. On the other hand, testing results of patients with aural vertigo were variable in a close relationship with the state of vertigo. This relation was more closely observed than that of the positional nystagmus test.The pattern of testing results was divided into the normal type (Type I) and the abnormal types (Type II, III, IV). Type I showed "Vestibular Symmetry" which was observed in the normal persons. Type II (Parallel Type) and Type III (Divergence Type) were originated from "Directional Preponderance", and Type IV (Convergence Type) was caused by "Vestibular Recruitment or Decruitment".Testing results before the attack of Meniere's disease showed the ipsilateral directional preponderance which changed to the contralateral direction after the attack and disappeared in line with improvement of vertigo.From observations of numerous testing results, this testing system was thought to be very suitable for the inspection of vertiginous course.
- 一般社団法人 日本耳鼻咽喉科学会の論文