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目的通过观察正常听力耳鸣患者的耳鸣音调分布状况,探讨耳鸣的听力下降相关机理。方法总结美国Iowa大学医院2000—2007年耳鸣患者数据库,根据听力图筛选196例耳鸣患者中的听力正常者,对他们的耳鸣音调进行观察。结果耳鸣患者中有34.69%为正常听力者,听力正常耳鸣患者的耳鸣音调分布从500Hz至8kHz频率范围,8kHz耳鸣音调患者占55.88%。最大听阈提高频率与耳鸣音调之间不存在相关性。结论耳鸣可以存在于正常听力人群中,耳鸣音调分布范围较广,耳鸣起源于听力损失的理论不适用于解释正常听力耳鸣人群,耳鸣产生的机理不能用单一的理论来解释。
Objective To investigate the mechanism of tinnitus hearing loss by observing the distribution of tinnitus tone in patients with normal hearing tinnitus. Methods The data of tinnitus patients from 2000 to 2007 at Iowa University Hospital were summarized. According to the audiogram, 196 tinnitus patients with normal hearing were selected to observe their tinnitus tone. Results 34.69% of tinnitus patients were normal hearing. The distribution of tinnitus in normal tinnitus patients ranged from 500Hz to 8kHz, and 55.88% of 8kHz tinnitus tones. There is no correlation between the maximum threshold increase frequency and the tinnitus pitch. Conclusion Tinnitus can exist in normal hearing people. The distribution of tinnitus tone is rather wide. The theory that tinnitus originated from hearing loss is not suitable to explain the normal hearing tinnitus. The mechanism of tinnitus can not be explained by a single theory.