ENG検査日の違いによる眼振の変化について-1-眼振出現率からの検討

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Since only a few clinics are capable of recording ENG on the first visit of patients with vertigo and/or equilibrium disturbance, we studied the relationship between the incidence of spontaneous nystagmus in ENG and the number of days from the first visit to the recording days. We intended to evaluate the present status of ENG examination carried out several days to weeks after the first visit as performed in most clinics.ENGs were recorded from 1, 260 patients with vertigo and/or disequilibrium and were analysed. No relationship was found between the incidence of nystagmus and the number of days until the date of recording within two weeks from the first visit. This means that the difference in the number of days until recording has no influence on the rate of appearance of nystagmus within two weeks. This indicates that the present status of ENG examination is acceptable.However, an opposite conclusion was drawn when ENG recording was analysed differently. The number of patients who demonstrated nystagmus in all of the four recording conditions, i. e. eyes closed, eyes closed with mental calculation, eyes covered, and eyes covered with mental calculation, decreased rapidly as days went by. Conversely, the number of cases which showed nystagmus in only one of those four conditions, increased as days went by. This result suggests that the ENG examination should be carried out as early as possible.In conclusion the present status of ENG recording in most clinics is insufficient. Our next report will clarify the relationship between the frequency and the slow phase velocity of nystagmus and the number of days until recording.
耳鼻咽喉科臨床学会の論文

ENG検査日の違いによる眼振の変化について-1-眼振出現率からの検討

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