Practica oto-rhino-laryngologica. Suppl.
Online ISSN : 2185-1557
Print ISSN : 0912-1870
ISSN-L : 0912-1870
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Volume 1991, Issue Supplement46
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  • Auditory Brainstem Responses by Using Bilateral Synchronous Recording
    Masahiro Ishikawa
    1991 Volume 1991 Issue Supplement46 Pages 1-23
    Published: July 05, 1991
    Released on J-STAGE: November 27, 2012
    DOIhttps://doi.org/10.5631/jibirinsuppl1986.1991.Supplement46_1
    JOURNAL FREE ACCESS
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    Measurement of normal latencies of ABR using bilateral synchronous recording has shown that waves IV and V are distinctly separate on the contralateral recording. The binaural interaction of ABR was investigated using bilateral synchronous recording.
    The binaural interaction of ABR was verified for contralaterally evoked waves IV and V. However, an interaction on ipsilaterally evoked ABR could not be verified, apparently due to the effect of the filter.
    The method of Dobie et al. was applied during bilateral synchronous recording as a means of confirming the binaural interaction of ABR. The contralateral ear was either masked with exposure to white noise or not. Then, binaural interaction of components appeared more frequently and that the amplitude of each component was significantly higer when the contralateral ear was masked. These phenomena suggest the effect of the efferent fibers of crossed olivary cochlear bundles.
    Clinical measurement of ABR using monoauricular stimulation and bilateral recording produced the findings described below. In patients with brainstem compression, both before and after surgery abnormal ABR was frequently recorded from the lead on the affected side upon stimulation of the unaffected side. Pre- and postoperative evaluation of brainstem compression by this method is considered important not only in examination of preoperative brainstem function but also in determination of the origin of each ABR wave.
    The usefulness of this method in patients with sudden deafness was also asses sed. There was an negative correlation between hearing level and ABR latency on ABR obtained by stimulation of the unaffected side and recorded from the affected side.
    It was found that ABR abnormalities could be detected at the early stage of RIND. An ABR study of a RIND patients during convalescene suggested that ABR responds sensitively to very slight change in blood floor.
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