Online ISSN : 1883-7301
Print ISSN : 0303-8106
ISSN-L : 0303-8106
Sudden Deafness: Statistical Studies and Its Problems
Shigeo Sugiyama
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1970 Volume 13 Issue 2 Pages 174-178


We conceive sudden deafness is an acutely developing nerve deafness without any apparent causes. In this paper, we report a statistic evaluation of this illness in the otolaryngology department of Osaka University Hospital and discuss about some problems.
1) The male and female, unilateral and bilateral incidence, and the age distribution were analysed and compaired between 6 years from 1954 to 1959 and 4 years from 1966 to 1969.
2) Data of the treatments in 2 years from 1967 to 1968 revealed the immediate need of treatment for sever sudden deafness, and the methods and results of treatment in 1969 were shown.
3) Our definition of sudden deafness is a nerve deafness with acute onset and unknown cause, with or without vertigo, and without remissions. The prognosis depends highly on the duration between the onset of the symptoms and the start of the therapy, and the severity of deafness. If this concept is correct, we want to propose to call “sudden deafness” limited to the cases, coming to the hospital within 10 days after the onset of the symotoms and in cases of 11 to 30 days, rather name it “delayed sudden deafness”, and not include the cases more than 1 month.
4) The incidence of bilateral sudden deafness is not clear. Reviewing the past literatures, the variation in frequency appeared 5% at minimum and 42% at the maximum, dut to the different concepts of sudden deafness whether including the unliateral cases with the past histry of the same disorder in the other side as bilateral. Some universal criteria are required.
5) The universal standard to evaluate the effects of the treatments is also necessary.

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