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OAE Exam 1

Review for OAE

What are OAEs? Low amplitude sounds caused by the motion of the eardrum in response to the vibrations deep within the cochlea
When OAEs are present, what does that suggest? That the cochlea (OHCs) and the middle ear are working fine
What are the types of OAEs? Spontaneous and Evoked (transient evoked, distortion-product, and stimulus frequency)
What is the prevalence of SOAEs? ~60%; more likely in females than males, more likely in right ear than left ear
When can SOAEs occur? Occur at different frequencies and only occur in normal ears. Occur 10-20 dB above the noise floor.
What is the prevalence of TOAEs in normal ears? slightly under 100%
How are TEOAEs evoked? By clicks (broadband or flat spectrum), tone bursts (need at least two cycles for good representation of signal), chirps
What are the primaries called and what is the optimal ratio for DPOAEs? f1 and f2 - the optimal ratio is f2/f1 = 1.22
What is the optimal intensity ranges for DPOAEs? L1 = 65dB and L2 = 55dB
If OAEs are not a test of hearing, then what do they test? ME propagation, integrity of cochlear components, cochlear dysfunction, response, OHC integrity, sub-clinical dysfunctions (ototoxic drugs, noise induced HL)
What are some clinical applications of OAEs? Newborn hearing screening, pediatric audiometry, functional HL, differentiating cochlear vs retro-cochlear HL, monitoring ototoxicity, tinnitus, noise music exposure
What are some non-pathological factors for abnormal OAEs? probe tip placement, probe insertion, standing waves, cerumen, vernix
What are some pathological factors for OAEs? stenosis, external otitis, cysts, exostosis, otitis media (A/B gap of greater than 15dB), ossicular disarticulation, TM dysfunction, otosclorosis, negative ME pressure, TM perf
What is the nonlinearity of the cochlea? For every 4dB of input there is 1dB of BM movement. Upwards spread of masking, loudness growth and recruitment
What type of SOAEs are in children? Older people? Large SOAEs in children and it decreases as one gets older
What are methods of reducing noise when recording OAEs? Close the door in sound treated booth, deep probe insertion, move person away from computer, turn person's head from computer, instruct pt to minimize mvmt, distract kids quietly, sedation/sleep, minimizing wire rubbing
What is the response of that the machine is for in DPOAEs? The CUBIC DIFFERENCE TONE, which is 2f1-f2, which is where the DP is expressed
What is being measured on DPOAEs? The geometric mean (where f1 and f2 meet)
What is signal averaging? Enhancing the signal and averaging out the noise
What is the new/recommended criteria for OAEs? Presence of OAEs greater than or equal to above the noise floor and minimal DP amplitude of 0dB
What input/outputs do you get with TEOAEs on the display? Input = temporal info (want little ringing) and spectral info (want smooth rounded spectral info) Output = response temporal info and TEOAE (response over the noise floor)
What level of stimulus is recommended to get maximum amplitude of TEOAEs? Moderately-high stimulus level ~80-85dB SPL
Created by: duda713
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