Li H, Zhong N
Union Hospital, Tongji Medical University, Wuhan 430022.
Lin Chuang Er Bi Yan Hou Ke Za Zhi. 1999 Apr;13(4):152-4.
To observe the changs of the amplitude and the spectral history of DPOAE in the slightly damaged cochlea.
Fifteen of young person with normal hearing were exposed to 4 kHz short-term pure tone (Level = 130 dB SPL) for 3 minutes to analysis the change of DPOAE in details after Temporary Threshold Shift (TTS).
The comparison of pre- and postexposure showed that the thresholds of sound reflex is 9.78 +/- 6.98, 8.04 +/- 5.58, 13.0 +/- 5.58 dB HL and 8.82 +/- 6.23, 5.75 +/- 4.42, 9.05 +/- 2.27 dB HL in 0.5, 1, 2 kHz, respectively. The amplitude of DPOAE decreased 4.28 dB SPL in 6 kHz, and the spectral history rippled significantly. The coefficience of variance is 5.18 +/- 1.63%. The combination of the amplitude and the coefficience of variance indicated that 80.0% of those is abnormal.
The results confirmed that the spectral history of DPOAE is a sensible tool to assess the slightly cochlear lesion together with the amplitude of DPOAE.
观察轻度受损耳蜗中畸变产物耳声发射（DPOAE）的幅值及频谱特征变化。
15名听力正常的年轻人暴露于4kHz短期纯音（强度=130dB SPL）3分钟，以详细分析暂时性阈移（TTS）后DPOAE的变化。
暴露前后比较显示，0.5、1、2kHz处声反射阈值分别为9.78±6.98、8.04±5.58、13.0±5.58dB HL和8.82±6.23、5.75±4.42、9.05±2.27dB HL。6kHz处DPOAE幅值下降4.28dB SPL，频谱特征有明显波动。变异系数为5.18±1.63%。幅值与变异系数相结合表明，其中80.0%异常。
结果证实，DPOAE的频谱特征与DPOAE幅值一起是评估轻度耳蜗病变的敏感工具。
