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作者从1800例有噪声接触史的患者中,发现27例(37耳)的听力图有两个切迹,即除了3000～6000赫的高频区有典型噪声性聋的切迹外,在500～1000赫的低频区还有一个切迹(多发生在1000赫频率处)。在两个切迹之间,多半是2000赫音频的听敏度较高,形成一个反向切迹(inverted notch)。作者分析了这27例患者的职业史、过去史和听力学检查的结果,并把这些资料与另外50例随机抽样的无双切迹听力图的患者进行比较后,指出低频区的切迹也是噪声损害的表现。作者提出了形成双切迹听力图的原因:(1)
From 1,800 patients with noisy history of exposure, we found that 27 cases (37 ears) of the audiogram have two notch, that is, in addition to the high frequency region of 3000 ~ 6000 Hz there is a typical noise-induced deaf notch, at 500 There is also a notch in the low frequency region of ~ 1000 Hz (mostly at 1000 Hz). Between the two notches, most of the audible frequencies at 2000 Hertz are higher and form an inverted notch. After analyzing the occupational history, past history, and audiological findings of these 27 patients, the authors compared these data with those of 50 patients with a random sample of uncut audiogram, and pointed out that notch in the low frequency region is also noise Damage performance. The authors propose the reason for forming a double-notch audiogram: (1)