BSR(聴性脳幹反応)についての自験--正常聴力者及び頭蓋内疾患のBSR所見

概要

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(1) In healthy adults with normal hearing, the test for BSR (brain stem response) was carried out under various conditions and the following was determined as suitable conditions for the detection of abnormalities of BSR. These conditions included i) interval of stimulation using click signals (semi sine waves of 4KHz): 100msec, ii) computer averaging: 2000 times and iii) the range of frequency: from 3000Hz to 0.53Hz.(2) In patients with lesions of the intracranial region, particularly those of the pontine angle region and the brain stem, results from the test for BSR were discussed, with regard to the disappearance of waves, prolongation of the latency from the 1st wave to the 5th wave and deformity of waves. Through the above examination, the following facts were noted:1) Patients who showed normal and/or slight disturbance of hearing in the pure tone audiometry sometimes developed abnormal findings in BSR and vice versa.2) Patients who showed severe symptoms due to dysfunction of the central nervous system were not always accompanied by disturbances of BSR.3) A certain group of patients with lesions of the central nervous system showed a positive correlation between changes in nervous symptoms and the above mentioned latency in BSR.
耳鼻咽喉科臨床学会の論文