There were 157 patients with typical and unilateral sudden deafness who had no cause, except for other diseases discovered by course and differential diagnosis, who visited our hospital during the last 8 years and had been treated until the hearing level was fixed.
The result was 29% complete recovery,23% remarkable improvement,19% slight improvement and 29% no improvement.
There was a significa n t difference in prognosis,1) whether sudden deafness had vertigo or not,2) whether it was treated within 9 days or not, after the onset, and 3) whether the mean hearing level was more than 90 dB or not.
