Abstract
Statistical observations are made in 529 ears on the long term variations in the threshold of sensorineural deafness. These cases are all retested audiometrically more than 6 months later. And the differences between the initial audiogram and the last one are statistically examined.A remarkable shift to recovery was shown in cases of so-called sudden deafness and cochlear neuronitis. On the other hand slight progression of hearing loss was observed in deafness due to SM, KM and KDM injection. Little changes were found in other cases.
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