大量注水法による温度性眼振について--健康成人における検討 (前庭機能異常の研究-1-)

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1) Twenty four healthy Japanese adults were tested with a bithermal caloric test using Fitzgerald and Hallpike's modified method. Caloric nystagmus was recorded in the eyes closed condition under a dim room light using conventional electronystagmography. The duration of nystagmus, maximum nystagmus beat number for 10sec and maximum slow phase eye velocity were measured manually from ENG recordings.2) Six of the 24 subjects gave up this test after cold or hot water irrigations due to prominent autonomic nervous symptoms and intense dizziness.3) The average value of nystagmus duration was 128.4sec. That of nystagmus beat number for 10sec was 21.1. The maximum slow phase eye velocity was 28.7°/sec.4) Fixation suppression of caloric nystagmus was measured using the formula reported by Takemori. The average value was 58.2% and standard deviation was 19.3%.5) The standard deviation of canal paresis and directional preponderance indexes in 18 subjects were 11.0% and 11.4%, respectively, when the maximum slow phase eye velocity was considered.
耳鼻咽喉科臨床学会の論文