Relationship of ENG Recording Date and ENG Findings.
Muneharu Ito, Hideo Shojaku, Yukio Watanabe, Kanemasa Mizukoshi, Ken‐ichi Kanda, Akihiko Ohmura · Equilibrium Research · 1996
Generally, the incidence of nystagmus decreases as the days from the onset of vertigo pass. To evaluate ENG findings accurately, we studied the relationship between the number of patients showing spontaneous and positional nystagmus on ENG and the number of days between onset and the recording day. Also, second recordings were obtained a few months after the first recordings. We reviewed four hundred and forty patients with vertigo and/or disequilibrium investigated by the Department of Otolaryngology of Joetsu General Hospital between 1990 and 1993. The following results were obtained. (1) In patients with peripheral vestibular disorders, the incidence of positional nystagmus within two weeks was higher than that more than two weeks after onset. On second recordings, the incidence decreased to half of that on the first recordings. (2) In patients with central disorders, there was no relationship between the incidence of positional nystagmus and the number of days after onset. We concluded that ENG recording should be carried out as early as possible following onset, especially in patients with peripheral vestibular disorders, and patients should be treated for a few months.