Introduction: The interaural differences of the intervals between the waves of the auditory brainstem responses (ABR) are very important in the pathology of the auditory system, especially for the topography of retrocochlear lesions. It is important to establish the
normal values for these intervals and to study the variables that affect the ABR including sex, age etc. Method: We included in this study 71 subjects with bilateral normal hearing. The evoked auditory brainstem responses were recorded by stimulation with decreasing intensities from 100 dBnHL to 10 dBnHL; we measured the latencies of the waves (I–V) and the intervals between these waves. Than we calculated interaural differences of the intervals in order to obtain the maximal values acceptable for normal hearing subjects.
Results and conclusions: the ABR were recorded to all subjects and the intervals were measured for the majority of the recordings obtained between 100 and 60 dBnHL and inconstantly for lower intensities. The values obtained for the interpeak delays I-III, III-V and I-V were under 0,20 ms, considered as the normal value for bilateral normal hearing persons. Longer interpeak delays can suggest a retrocochlear pathology.
- AUDITORY BRAINSTEM RESPONSE (ABR)
- INTERAURAL INTERPEAK DELAY.