1990 Volume 33 Issue 3 Pages 251-258
Emission cochleogram was investigated in 17 cases of unilateral cochlear hearing loss consisting of 5 cases of unilateral deafness, 8 cases of sudden deafness and 4 cases of Meniere's disease. The stimulus sounds were tone-bursts at 5 frequencies between 1kHz and 4kHz. The results obtained were as follows:
1) The pseudothreshold of evoked otoacoustic emission (e-OAE) was elevated in all affected ears.
2) The configuration of emission cochleogram corresponded well with that of the pure tone audiogram in each affected ear, considering the fact that the pseudothreshold is elevated at high frequencies even in normal hearing ears.
3) The sum or mean value of interaural differences of pseudothresholds at several stimulus frequencies between 1kHz and 4kHz could be a more excellent clinical indicator than the interaural difference of pseudothreshold at a single stimulus frequency in order to predict the function of cochlear micromechanics more precisely.
