|Karina Mrugalska-Handke, Andrzej Stefaniak, Adam Piłka, Krzysztof Kochanek, Henryk Skarżyński|
Introduction. Comparison of recordings of air-conduction and
bone-conduction auditory brainstem responses (ABRs) offers a
possibility of recognizing, in a more reliable way, the degree of
conductive hearing losses, and quantitatively assessing the size
of the air-bone gap.
Aim. The aim of the study was to compare the latency and
threshold of wave V evoked by a click and a 1000 Hz tone-burst
for air and bone conduction.
Material and methods. A group of 66 sensorineural and
conductive hearing loss children at the age between 9 and 12
were examined. ABR responses were recorded for both stimuli
and conduction types at stimulus intensities varied in 10 dB
steps. In order to assess the usefulness of the bone conduction
ABR method for hearing sensitivity evaluation, the ABR wave
V threshold values were compared with the hearing threshold
values obtained in audiometric tests.
Results. The latency of wave V for tone-burst stimulus at 1000
Hz was longer than that for the click stimulus, irrespective of the
stimulation conduction type. Statistical analysis did not reveal
any significant differences between the latencies measured in
ABRs evoked by air and bone conduction, irrespective of the
kind of stimulus applied in the group of children with sensorineural
hearing loss. Significant differences were found in the
group of children with conductive hearing loss.
Conclusions. Auditory brainstem responses elicited through
bone conduction can be a valuable supplement to standard ABR
for air conduction.
keywords: słuchowe potencjały wywołane pnia mózgu,próg słyszenia, przewodnictwo powietrzne, przewodnictwo kostne
pages: from 115 to 123
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