Galvanic Body-Sway testの電子計算機による分析 (前庭機能異常の研究-2-<特集>)

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In general, the threshold of Galvanic body-sway is much lower than that of galvanic nystagmus. Therefore, in order to establish a clinical galvanic body-sway test for differential diagnosis between vestibular endorgan and retrocochlear lesions, we have studied on effects of galvanic stimulation on the body-sway by using the gravicorder. The galvanic stimuli were used by the stimulator, in which the DC-currents were controlled from 0.1mA to 1.0mA, and applied for 5sec. The test subjects stood on the gravicorder (Anima Co.) with feet together, eyes closed, and hands at sides.The 10 induced galvanic body-sway were averaged by using the small digital computer PDP 11/34. The normal characteristics of the galvanic body-sway responses were measured in a group of 8 normal subjects. In these tests, the direction of body-sway, patterns of swaying, the latency of the initial sway were analyzed by the computer. In these normal subjects, the initial body-sway to the cathode sides appeared at 0.22 seconds in average after the galvanic stimulation (0.6mA), and then the second sway to the anode side deviated at 0.45 seconds in average after the start of the stimulation. Increasing stimulus current from 0.1mA to 1.0mA produced a linear increase in the galvanic-response amplitude. Therefore, the thresholds of the galvanic body-sway test could be measured by these test procedures. No side effects were observed in these galvanic stimulation under 0.6mA.
耳鼻咽喉科臨床学会の論文

Galvanic Body-Sway testの電子計算機による分析 (前庭機能異常の研究-2-<特集>)

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