自記オージオメトリーにおける異常振幅増大の診断的意義

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タイトル別名
  • Abnormally Large Tracing Amplitudes on Békésy Audiometry
  • ジキ オージオメトリー ニ オケル イジョウ シンプク ゾウダイ ノ シンダン

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Sixty-six patients showing large tracing amplitudes above 15dB were selected from about 1, 000 patients with sensori-neural hearing disorder.<br>Thirty-eight of the 66 cases showed a difference in the tracking amplitude between the left and the right ears. It was considered from this data that some of the large amplitude values indicate certain pathological conditions in the central auditory system.<br>In order to elucidate the causative mechanism for the large amplitude, three groups of patients were selected for investigation from those revealing large amplitudes. These groups are: 1. those showing the type III or type IV trace of Jerger's classification, 2. those with poor speech discrimination despite a normal threshold for pure tone, and 3. patients demonstrating poor discrimination for distorted speech sounds with normal hearing for normal speech sounds. A detailed analysis of these data indicated that abnormally large amplitudes of the Békésy tracing are caused by some types of widespread central lesions.<br>The results of the binaural separation test in those with pathologically wide tracing amplitudes were analyzed. It was concluded that the wide excursion may be caused not only by disorders in the right hemisphere but also by some types of dysfunction of the whole cerebrum.

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