Probst R, Harris F P
Department of Otorhinolaryngology, Kantonsspital, Basel, Switzerland.
Arch Otolaryngol Head Neck Surg. 1993 Aug;119(8):858-60. doi: 10.1001/archotol.1993.01880200058009.
Evoked otoacoustic emissions can be measured after a transient stimulus or as distortion products of two pure tones. Measurements of both emission types are being used more frequently as the techniques become easier to implement and the clinical benefits are realized. In addition, comparisons between the two types of emissions from the same ear provide information about cochlear mechanisms. We have measured transiently evoked otoacoustic emissions (TEOAEs) stimulated with clicks and distortion-product otoacoustic emissions (DPOAEs) from 166 ears of individuals with and without hearing impairment. The TEOAE and DPOAE amplitudes were compared with each other and with corresponding audiometric thresholds by frequency. Results revealed a high correspondence between the two emission types (r = .78) and between the distribution of the energy for each emission and audiometric threshold levels at corresponding frequencies (DPOAE, Spearman p = -.84; TEOAE, p = -.77). The DPOAEs were present more often than were TEOAEs when hearing levels across frequency were greater than 30-dB hearing level. The results suggest that both TEOAEs and DPOAEs are derived largely from similar mechanisms. The differences between the occurrence of the two emissions by audiometric threshold level would suggest that TEOAEs may be preferable for screening purposes, whereas DPOAEs may be more valuable for monitoring cochlear changes clinically.
诱发耳声发射可在短暂刺激后进行测量，也可作为两个纯音的畸变产物进行测量。随着技术变得更易于实施且临床益处得以实现，这两种发射类型的测量正越来越频繁地被使用。此外，同一耳的两种发射类型之间的比较可提供有关耳蜗机制的信息。我们测量了有听力障碍和无听力障碍个体的166只耳的瞬态诱发耳声发射（TEOAEs）（由短声刺激）和畸变产物耳声发射（DPOAEs）。将TEOAE和DPOAE的幅值相互比较，并与相应频率的听力阈值进行比较。结果显示，两种发射类型之间（r = 0.78）以及每种发射的能量分布与相应频率的听力阈值水平之间（DPOAE，Spearman p = -0.84；TEOAE，p = -0.77）具有高度相关性。当各频率的听力水平大于30 dB听力级时，DPOAE比TEOAE更常出现。结果表明，TEOAE和DPOAE在很大程度上都源自相似的机制。两种发射根据听力阈值水平出现情况的差异表明，TEOAE可能更适合用于筛查目的，而DPOAE在临床上监测耳蜗变化可能更有价值。
