The Application of Impedance Audiometry to the Diagnosis of Deafness

Publisher Website
Google Scholar
Abstract
By using impedance meter (Madsen ZO72), it was demonstrated that the measurement of stapedial reflex in sensorineural hearing loss is useful as an objective test of demonstrating the presence of recruitment. In retrocochlear deafness, stapedial reflex threshold is elevated in most cases to 15dB higher level than that in normal hearing subjects. In central lesions as sensory aphasia, temporal lobe tumor or pineal body tumor which might have not involved stapedial reflex arc, the stapedial reflex can be elicited at the same level as in normal hearing sub jests, while in the lesions of the stapedial reflex arc itself, the threshold of the reflex is within normal value or elevated either or both ears. Therefore, topical diagnosis in the central auditory pathways is possible in combination with other audiometric tests including distorted or non-distorted speech discrimination test, directional hearing test, Békésy audiometry, etc. In postoperative cases of posterior fossa tumor in which symmetrical hearing loss and positive recruitment is demonstrated by stapedial reflex threshold, SISI and uncomfortable level with the findings suggestive of retrocochlear lesions in other audiometric test, the probable occurrence of loudness recruitment in branin stem lesions as suggested by Dix et al was also confirmed.

This publication has 0 references indexed in Scilit: