Sudden deafness with down slope audiogram patterns.

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Patients with sudden deafness whose audiogram patterns revealed a gradual rise in high frequency hearing loss were investigated. We called these "down slope audiogram patterns".Thirteen percent of patients with idiopathic sudden deafness had down slope audiograms. They were older than the other patients with sudden deafness. The incidence of vertigo in this group was less than in other sudden deafness groups. Her-pes simplex virus (HSV) antibody titers were higher in this group.Twenty three percent of the patients with sudden deafness of down slope type had sensori-neural hearing loss in the contralateral ear. Eighty percent of the patients with HSV serum antibody titers 1: 32 or higher had contralateral hearing loss. Thus, HSV infection may be one of the causative factors of idiopathic sudden deafness.The cure rate was 29%, which is satisfactory for the sudden deafness of down slope type, because in other reports the prognosis has been very poor. Of those cured, eight had contralateral hearing loss. In six of the eight patients the cause of hearing loss was probably due to aging.The differential diagnosis between sudden deafness and bilateral idiopathic progressive sensori-neural hearing loss is discussed.
耳鼻咽喉科臨床学会の論文