2004•Chinese Journal of Aerospace MedicineRequires access
Measurement of evoked otoacoustic emissions in pilots with normal pure tone hearing thresholds
Zhen‐Ming Xu
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Abstract
Objective To detect the early hearing impairment induced by noise in pilots. Methods Thirty pilots with normal pure tone hearing thresholds served as subjects and 15 normal volunteers as controls. Transient evoked otoacoustic emission (TEOAE) and distortion-product evoked otoacoustic emission (DPOAE) were recorded with Capella acoustic emission machine, and the results of 2 groups were compared and analyzed. Results As compared with those of controls, the DPOAE amplitudes at high frequencies, the wave signal noise ratio (SNR), wave reproducibility, band SNR and band reproducibility of TEOAE were significantly lowered. Conclusions It is suggested that early hearing impairment may exist in pilots with normal pure tone hearing thresholds. TEOAE and DPOAE may be used to detect the early hearing impairment dynamically in pilots.