Abstract
The aim of this study was to investigate the progression in contralateral ears of 400 children in whom 28 had total deafness or others sensorineural hearing loss (30dB or more in at least one audiometric frequency). We analyzed 372 children with total deafness in one ear and the other had normal hearing. The results obtained were as follows;
1) The longest observation period of 28 cases was 21 years, with the average period of 8.5 years. It was found that 10 cases of 28 (35.7%) showed progression, 1case (3.6%) showed fluctuation and 2 cases (7.1%) showed fluctuation and progression.
2) It was found that 6 cases of 372 (1.6%) showed progression and 2 cases (0.5%) showed fluctuation and progression in the longer observation period with the average of 7.5 years.
3) In progressive and fluctuated cases, there might be some cases with delayed endolymphatic hydrops.
