DIAGNOSTIC SIGNIFICANCE OF SPONTANEOUS NYSTAGMUS AS OBSERVED IN ELECTRONYSTAGMOGRAPHIC EXAMINATION

A study of spontaneous nystagmus in 121 normal subjects and 1601 patients suggests that an 'idiopathic spontaneous nystagmus' is recorded with the subject's eyes closed in 20-25% of both the normal and patient population. This nystagmus is probably of no significance in the diagnosis of vertigo-producing disorders. It is of low intensity (usually below 6°sec, but occasionally in the 6-10°sec range), and is more frequently directed to the left than to the right. Spontaneous nystagmus above 10°sec is of diagnostic significance. It is probable that such a nystagmus will be of peripheral origin and directed away from the side of the peripheral lesion. © 1969 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.