[Distortion product otoacoustic emissions on neonates]

Distortion product otoacoustic emissions (DPOAE) is evoked by two pure-tones (f1, f2). It is a kind of reflex of cochlea. In order to know the effect of different elements on DPOAE of neonates, we used GSI 60 DPOAE to detect the DPOAE of 40 ears of 20 neonates. The results showed that when f1 was below 1,000 Hz, the incidence of DPOAE was very low. When the f1 was between 1,400 and 4,000 Hz, the incidence of detectability was more than 90%. The amplitude of DPOAE was low within lower frequency area, while f1 was between 1,000 and 4,000 Hz, the amplitude was higher. We consider that the DPOAE of neonates were easily affected by noise, stimulus intensity, the function of middle ear, etc. We must pay attention to these elements when we use DPOAE to test hearing function of neonates.