In the present study, we examined the temperature of aural air stimulation that was equivalent to aural stimulation with water at 20
°C in the caloric test. In 10 ears of 5 healthy volunteers, the maximum slow phase eye velocities (MSPEVs) of nystagmus induced by aural stimulation with air at 22
°C, 46
°C and 16
°C were the same as those with water at 30
°C, 44
°C and 20
°C, respectively. These findings suggest that caloric stimulation with air at 16
°C is equivalent to that with water at 20
°C that is commonly used in the caloric test in Japan. The MSPEVs of nystagmus induced by aural stimulation with air at 16
°C were over 20°/sec in all ears except one, in which the MSPEV was 19.7°/sec. The criteria of canal paresis where the MSPEV of caloric nystagmus induced by aural stimulation with water at 20
°C is less than 20°/sec can be used in the caloric test with aural air stimulation at 16
°C.
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