Otoacoustic Emissions

Question 1

What part of the cochlea produces OAEs?

Answer 1

Outer Hair Cells

Question 2

What is a DPOAE?

Answer 2

Distortion product OAE
Evoked in response to a stimulus
2 simultaneous pure tones played at different frequencies

Question 3

What is a TEOEA?

Answer 3

Transient Evoked OAE
Short duration stimuli in short bursts or clicks

Question 4

What does present OAEs usually indicate?

Answer 4

Can show there is hearing below 40dB

Question 5

When will OEAs be absent?

Answer 5

Conductive hearing loss
Retro Cochlear hearing loss

Question 6

What can OEAs test?

Answer 6

Check NOHL
Newborn hearing screenings
Ototoxicity monitoring
Early detection of noise damage

Question 7

Who discovered OAEs?

Answer 7

David Kemp

Question 8

What is the recommended stimulation level for TEOAEs?

Answer 8

Between 81 and 87dB click evoked

Question 9

What is the acceptable SNR?

Answer 9

6dB or below

Question 10

What is considered normal amplitude for a TEOEA?

Answer 10

Between -10dB SPL to +30dB SPL

Question 11

What are the typical stimulus levels used for DPOAE?

Answer 11

L1 = 65 and L2 = 55 or 50

Question 12

What is the ratio for the 2 pure tones used in DPOAEs?

Answer 12

1:2
i.e., f1 = 1000Hz f2 = 1200Hz