臨床
Dip型オージオグラムを呈した原因不明の急性感音難聴の10例
2023 年 116 巻 6 号 p. 519-527
詳細
2023 年 116 巻 6 号 p. 519-527
A dip-type audiogram is relatively rare in cases of idiopathic sudden sensorineural hearing loss.
I performed a retrospective analysis of the data of 10 patients with idiopathic sudden sensorineural hearing loss with a dip-type audiogram who visited my clinic between October 2008 and September 2021.
The patients consisted of three men and seven women, ranging in age from 17 to 38 years, with a mean age of 27.3 years. In regard to the chief complaint, four patients presented with hearing loss, two presented with tinnitus, and four presented with ear fullness. None of the patients had any vestibular symptoms. The dip in the audiogram was located at 1000 Hz in two cases, at 2000 Hz in six cases, and at 3000 Hz in two cases. The hearing level at the dip was between 25 and 50 dB. All patients were treated with mecobalamin, ATP and betamethasone until the hearing became normal and the symptoms disappeared. Most of the patients were cured within a short period of time.
If cochlear symptoms are present and octave frequency pure tone audiometry does not reveal hearing impairment, a half octave audiometry should be performed.
