Tsunoda R, Hentona H, Komatsuzaki A, Hata Y
Department of Otolaryngology, Saitama Cancer Center.
Nihon Jibiinkoka Gakkai Kaiho. 1993 Nov;96(11):1933-9. doi: 10.3950/jibiinkoka.96.1933.
The cold-warm caloric test is performed with water irrigation, using a hot temperature of 44 degrees C and a cold temperature of 30 degrees C, which are thermally equidistant from the body temperature 37 degrees C. However, the 30 degrees C irrigation nearly always produces a stronger nystagmic response than that of the 44 degrees C stimulation. The purpose of this study is to investigate the difference in nystagmic response between cold and hot stimulation. The achieved hot (44 degrees C) and cold (30 degrees C) water samples were prepared, and irrigation was with a disposable plastic syringe. Temperature changes in the external auditory canal were monitored by tympanic thermometry during the cold-warm caloric test. Maximal slow phase velocity and the duration of induced nystagmus were recorded on an electro-nystagmograph. The following conclusions were drawn; 1) The average normal external auditory canal temperature was 36.8 degrees C, and there was no side difference between the right and left ears. External canal temperature was higher than that of the axilla. 2) When 20 ml of 30 degrees C water was instilled the temperature change in the external canal was larger than that in response to the 44 degrees C water and the maximal slow phase velocity of nystagmus for cold stimulation was stronger than that for hot. However, the duration of nystagmus for the cold was not significantly longer than that of the hot stimulation.
冷热试验通过水冲洗进行，使用44℃的热水温度和30℃的冷水温度，这两个温度与体温37℃在热学上距离相等。然而，30℃的冲洗几乎总是比44℃的刺激产生更强的眼球震颤反应。本研究的目的是调查冷热刺激之间眼球震颤反应的差异。制备了达到所需温度的热（44℃）水和冷（30℃）水样本，并用一次性塑料注射器进行冲洗。在冷热试验期间，通过鼓膜温度计监测外耳道的温度变化。在眼震电图上记录最大慢相速度和诱发眼球震颤的持续时间。得出以下结论：1）正常外耳道平均温度为36.8℃，左右耳之间无差异。外耳道温度高于腋窝温度。2）当注入20毫升30℃的水时，外耳道的温度变化大于注入44℃水时的变化，冷刺激诱发的眼球震颤最大慢相速度比热刺激更强。然而，冷刺激诱发的眼球震颤持续时间并不比热刺激显著更长。
