Abstract
In 70 cases of sudden deafness (SD) treated in our hospital, the prognostic factors were analyzed by t-test using recovery rate. The factors including ages, days before therapy, vertigo, hearing levels, the difference between high- and low-frequency hearing level (H-L difference), were estimated. H-L difference was calculated by (8000Hz+4000Hz)/2-(250Hz+500Hz)/2. The poor prognostic factors were 1) over 40 years old, 2) first visit after 8 days from onset, 3) initial hearing level was less than 60dB or more than 80dB HL, 4) H-L difference was zero or more. Vertigo had no relation to prognosis. The group of patients who had more than two factors had poor prognosis without preference for hearing level. The number of poor prognostic factors is thought to be a good index for prognosis of SD.
