Nystagmus during attack in Menière's disease.

Nystagmus in Ménière's disease before the vertiginous attack to its end was recorded using a newly devised long recording portable electronystagmograph. The nystagmus to the affected side was recorded before the patient complained of vertigo, while the non-affected side was recorded at the onset of the attack. And the nystagmus to the affected side was recorded in the middle and at the end of the attack.