突発性難聴の予後判定--平衡機能検査,蝸電図法を指標とする観察

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Forty-three patients with sudden deafness were examined by equilibrium tests and electrocochleography during the early stage of the onset (within two weeks). We estimated the role of the tests about the prognosis of sudden deafness. The results were as follows.1) In complete recovery, the wave forms of AP response were high amplitude and the -SP appeared. The latency of AP response was almost within normal limit (1.35-1.75msec). Examined by equilibrium tests there were no abnormal findings in all patients but one.2) In remarkable improvement, the wave forms of AP response were low amplitude and those of the -SP were same. In a large number of the cases latency of the AP delayed at 85dBHL (>2.0msec).In thirteen of sixteen cases the equilibrium tests revealed abnormal findings.3) In slight improvement and no change, there were some cases of no response of AP and -SP. Examined by equilibrium tests it seemed to indicate that the neural regions were impaired.As above-mentioned it was concluded that the electrocochleography and equilibrium tests were very helpful in estimating the prognosis of sudden deafness during the early stage of the onset.
耳鼻咽喉科臨床学会の論文