[The effects of tympanotomy tube insertion on distortion product otoacoustic emissions].

OBJECTIVE

To discuss the effects of tympanotomy tube insertion on distortion product acoustic emissions.

METHOD: Twenty-six patients (29 ears) with B type of tympanogram and conductive hearing loss but their bone conductive threshold was less than 30 dB were selected and recorded the DPOAE audiogram with Smart OAE4.24 otodymic analyser before, shortly after and two weeks after tube insertion. Twelve normal subjects were selected as control.

RESULT: The eliciting rate and amplitude increased after tube insertion. The difference in 1105, 1560, 2211, 4416 Hz were significant. The amplitude went up two weeks later.

CONCLUSION

The amplitude of DPOAE can be influenced by otitis media with effusion, tympanic membrane perforation and tympanotomy tube, and improved after tympanotomy tube insertion, but it can't reach the normal level.