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KMID : 0921420020070030160
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Korean Journal of Communication Disorders
2002 Volume.7 No. 3 p.160 ~ p.178
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Clinical application of bone conduction auditory brainstem responses to Tone Burst
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Kim Jin-Sook
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Abstract
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Auditory Brainstem Responses(ABRs) were recorded with Click, Tone Burst(TB) 500Hz, 2000 Hz air conduction (AC) and bone conduction (BC) stimuli from normal hearing adults. With a Click at 20 dBHL, TB2000 responses were 100% detectable, but TB500 was 95% detectable. At 10 dBHL, Click and TB500 were detectable in 70% and 50% of the subjects and TB2000 was detectable in 90%. Latencies in Tone Bursts were significantly longer for BC compared to AC. Wave V amplitude in BC was always larger than AC. Latency and Amplitude of the response were related to the stimuli. Both ipsilateral and contralateral responses were similar in latency, amplitude and morphology. Responses to Click, TB500 and TB2000 were different and the differences were statistically meaningful. Latencies to Click, TB500 and TB2000 were statistically different. However amplitudes showed no significant difference except for the responses from ipsilateral 30 and 40 dB. When comparing air and bone conduction, only 50 dB Click and TB2000 showed a significant difference. Calculated slop b from TB500 was steeper than that of the other stimuli, whereas the slope of TB 2000 and Cllick were more flat. Moreover, TB500 showed the biggest intercept a. Derived-band analysis indicated a reasonably good frequency specificity for both the Tone Burst response and the bone-conducted Click response, despite it’s low frequency spectrum. The results of this study support the use of BC Tone Burst ABR for demonstrating normal frequency-specific cochlear sensitivity.
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KEYWORD
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Auditory Brainstem Response (ABR), Click, Air Conduction (AC), Bone Conduction (BC), Latency, Amplitude, Slop
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