A simple way to evaluate caloric tests quantitatively using a video tape recording

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  • ビデオを用いたカロリックテストの簡便な定量評価法

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The maximum slow phase velocity of caloric induced nystagmus could be measured with the herein described newly developed method, which needs no calibration, using an infrared CCD camera, a video tape recorder (VTR) and a TV monitor. Fourteen patients suffering from dizziness underwent caloric tests (5ml of 20° water). Their eye movements were recorded simultaneously in the VTR and an electronystagmogram (ENG) with their eyes open in darkness. The maximum velocity of the slow phase was measured using this method, and was less than 10°/s in 7 ears of 6 patients who were all diagnosed as having canal paresis (CP). Concerning CP, the evaluation of the caloric tests recorded with the VTR correlated with the ENG findings. Since we can evaluate the caloric tests quantitatively in most patients more easily with the VTR than with an ENG, this newly developed method is therefore recommended especially for busy ENT doctors.

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