聴力分布からみた突発性難聴の病態
1994 年 4 巻 2 号 p. 117-124
詳細
1994 年 4 巻 2 号 p. 117-124
The initial and final hearing levels of patients with sudden deafness were investigated using the hearing distribution as a parameter to elucidate the clinico-pathological feature of sudden deafness.
The hearing distribution was obtained by calculating the moving average values from the values of the frequency distribution (audiohistogram).
The pure-tone hearing levels of 407 cases with sudden deafness, who visited Kitasato University Hospital within four days after the onset were investigated at each frequency of 250-8000Hz. Three peaks, at normal hearing level, ca 70dB level and out of scale level, were observed in the hearing distribution of the initial and final audiograms. From the analysis of the hearing distribution of the hearing-improved and unimproved cases, it was revealed that the peaks were formed inevitably.
The relation between the pathological features of sudden deafness and the peaks in the hearing distribution was discussed.
