書誌事項
- タイトル別名
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- Review of the evaluation criteria for low tone sudden deafness.
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抄録
Low tone sudden deafness (LTSD) has the three following features; obscure origin, acute or sudden onset and sensorineural hearing loss limited to low frequencies without vertigo. Twenty LTSD patients with total hearing levels at low frequencies (125Hz, 250Hz, 500Hz) from 70dB to 95dB (Group A) and 19 LTSD patients (typical LTSD) with levels above 100dB (Group B) were studied. All patients visited our department within one week after onset. All presented over the past 3 years and were follwed up for two years or more after initial examination. The clinical parameters such as incidence, subjective symptoms, the configuration of the audiogram and the prognoses of patients in the two groups were investigated comparatively. The following results were obtained.<br>(1) Patients in their twenties were more frequently affected in group A, but patients aged 20 to 50 were equally affected in group B.<br>(2) Females were more frequently affected in both groups, remarkably so in group B.<br>(3) Hearing disorders frequently occurred after an upper respiratory tract infection and stress in both groups.<br>(4) Fullness of the ear, tinnitus and hearing disturbance were common chief complaint and subjective symptoms in both groups.<br>(5) The configuration of the audiogram seemed to be variable within each group and between the two groups.<br>(6) The ratios of recurrent type to monoattack type were almost the same and the patients had good prognoses in both groups.<br>From the results mentioned above, both groups were considered to belong to the same category of LTSD. If this speculation is correct, LTSD seems to be a common disease which has its highest peak at the 70dB level in the distribution of total hearing level at low frequencies and the ratio of monoattack type to recurrent type is considered to be 3 to 1. More than 70dB total hearing level at low frequencies is desirable for analyzing the clinical parameters and pathological state as the evaluation criteria of sensorineural hearing loss of LTSD.
収録刊行物
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- 日本耳鼻咽喉科学会会報
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日本耳鼻咽喉科学会会報 95 (1), 7-14, 1992
一般社団法人 日本耳鼻咽喉科頭頸部外科学会