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Pseudocaloric nystagmus (PCN) is an appropriately beating nystagmus induced by cold caloric irrigation of an ear with abolished vestibular function. The nystagmus is not the result of endolymph flow but probably represents unmasking a latent nystagmus by altering the patient in this case, through tactile (caloric) stimulation. Pseudocaloric nystagmus has the following characteristics: (1) mild intensity (eyes closed-slow phase velocity usually less than 8 degrees/sec), it has not been observed with the eyes open, (2) always beats away from the diseased ear; therefore, any nystagmus induced by cold irrigation will be appropriately (contralateral) beating while that induced by warm irrigation will be inappropriately (contralateral beating; 3) the induced nystagmus will not reverse direction after inverting the ampulla.
View Article and Find Full Text PDF[Electronystagmorgraphic diagnosis of congenital nystagmus].
Ann Otolaryngol Chir Cervicofac
January 1974
[Electronystagmorgraphic data in the diminished sinusoidal rotatory test].
Acta Otorhinolaryngol Belg
December 1971
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