Otodynamics' Forums

Dear Sir

Is it possible to get good TEOAE emissions while DPOAE emissions are absent.Can this happen in a ear with severe to profound sensory neural hearing loss.

Praveena

Hello,

It should not be possible to get good TEOAE emissions with absent DPOAE admissions.

Generally it is possible to observe DPOAEs with greater levels of cochlea damage than is possible for TEOAEs. This is because the energy in the DPOAE stimulus is focused on a narrow region of the cochlea, whereas the click stimulus used in TEOAE testing is distributed across a wide frequency range. The higher intensity stimuli allow weaker emissions to be recorded.

Care should be taken when comparing TE and DP OAEs because of the different methodologies used to record them. DPOAEs are difficult to record at low frequencies and are limited by the resolution (points per octave) of the test. TEOAEs are easier to record at low frequencies but are not recorded at high frequencies. A deaf ear with some residual low frequency hearing might show some low frequency TEOAEs but no recordable DPOAEs. Recording DPOAEs at a low resolution might miss emissions that are present between the test frequencies.

Normally neither DPOAE or TEOAEs are present in a severe to profound sensory neural hearing loss. However, rarely, the loss may be due to a dysfunction of the inner hair cells or the nerve pathway with intact outer hair cells.

Oliver Brill
Product Scientist

Hello Every Buddy,

In that condition is not possible for the OAE Application. Generally it is possible to DPOAE with greater levels of cochlea damage than is possible.

thanks