Study on the Stability of Wave VI & VII of ABR

Abstract

The modality of wave VI & VII of auditory brainstem response (ABR) were studied. The response threshold of wave VI was 42dB above hearing level, and of wave VII was 60dB. The producibility of wave VI was 78% at 60dB above hearing level, and 90% at 80dB. The producibility of wave VII was 52% at 60 dB above hearing level, and 65% at 80dB. Mean peak latencies and those standard deviations (SD) of wave VI were 7.3±0.2msec (at 60dB avove hearing level) and 7.2±0.2msec (at 80dB). Of wave VII, 8.9±0.3msec (at 60dB) and 8.8±0.3msec (at 80dB). At 80dB above hearing level, inter-peak latencies (IPL) and those SDs of I-VI and III-VI were 5.5±0.2msec and 3.3±0.2msec I-VII and III-VII were 7.2±0.3msec and 5.1±0.3msec. SDs related with wave V were both 0.2msec (I-V, III-V). Wave VI is reliable enough to apply for the clinical usage as one of the parameters of ABR.