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OAE Exam 1
Review for OAE
| Question | Answer |
|---|---|
| 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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