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双侧感音神经性聋的听力阈（HTL）升高相当快，病因不明。日本卫生福利局调查委员会（RCMHW）将其定义为自发性双侧感音神经性聋（IBSH），并制定了其诊断标准。①进行性2②双侧性；③病因不明。并且需经过长时期的观察和听力检查。但是HTL上升的速度未列入标准之内。由于正常?
The hearing threshold (HTL) of bilateral sensorineural deafness rises quite fast, the etiology is unknown. The Japanese Health and Welfare Board’s Commission of Inquiry (RCMHW) defines it as spontaneous bilateral sensorineural hearing loss (IBSH) and sets its diagnostic criteria. ① progressive 2 ② bilateral; ③ etiology is unknown. And after a long period of observation and hearing. However, the rate of rise of HTL is not included in the standard. Due to normal?