Abstract
In 49 cases of sudden deafness, 4 cases of recurrence of dysequilibrium and one case of persistence for more than one year were observed. The symptoms at the recurrent stage were not episodic vertigo as Meniere's disease, but positional as paroxysmal positional vertigo. Except one case in which the positional vertigo was persistent since onset, another 4 cases had several months of symptom free periods after the relief of vertigenous attack at the onset.
Neurotological examination reve aled rotatory positional and positioning nystagmus accompanying vertigenous sensation. Caloric test at the recurrent stage showed some improvement comparing with that of the onset stage. There was no hearing improvement in all cases. For relief of dysequilibrium, several times of inner ear anesthesia (4% xylocain perfusion into the tympanic cavity) and streptmycin sulfate perfusion were performed and good results were obtained. Long lasting dizziness and positional vertigo of these cases were supposed to be induced by abnormal irritation of partially involved vestibular labyrinth at the process of recovery from vestibular hypofunction.
