Methods to check on objective acoustic impedance and subjective pure tone audiometry.

方法对外伤性聋进行客观声导抗测试和主观纯音测试。

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Methods the pure tone thresholds of 30 subjects (60 ears) were measured by pure tone audiometry and MCML was obtained by means of the same frequency tone masking test.

方法30例受试者(60耳)分别进行纯音测听，首先测出双耳的纯音听阈，然后应用同频音掩蔽试验测试各个频率的MCML。

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Pure tone audiometry: Slight sensorineural hearing loss mainly at the lower frequency may be detected during or soon after attack. It may be recovered or lightened after the attack.

纯音测听：发作时或发作后不久，可检测到轻度的、以低频听力损失为主的感觉神经性耳聋，发作后恢复正常或减轻。

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More direct evidence from studies of experiments with animals and humans, however, suggests that we may have to alter the very concept of what we mean by hearing loss, and that current tests - particularly pure-tone audiometry which measures our ability to perform "pin-drop" hearing - may not be sufficient to pick up the early signs of a decline in hearing function.

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