Abstract
We reported herein variations in normal and abnormal patterns in auditory brain stem responses (BSR). Variations of the normal pattern which could be recorded in healthy subjects, were divided into six types and the first, third and fifth waves were evident. The fifth wave also could be recorded in patients with peripheral hearing impairement, except in those almost totally deaf.
On the other hand, variations in the abnormal patterns seen in the patients with brain stem lesions were divided into two types. In the former type, the latency of the fifth wave was delayed and in the latter type, the fifth wave could not be recorded. Therefore, it is important to check for delays in the latency and defects of the fifth wave when attempting of assess auditory brain stem responses.
