Term
| This response is following the polarity that you put in the ear |
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Definition
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Term
| Is the CM an outer or inner hair cell response? |
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Definition
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Term
| The CM looks at the ___ of the electrical response |
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Definition
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Term
Summating Potential:
-Primarily an ___ hair cell response.
-Influenced by stimulus ___ but not by ___
-If we wanted to measure an SP we could use a ___-___ stimulus
-Ends when stimulus ___ ___
-Can give us information about ___ |
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Definition
| outer; duration; frequency; steady-state; goes off; duration |
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Term
Action Potential:
-Onset response of __HC to spiral ganglion to 8th nerve -Same wave as ___ 8th nerve of ABR
-Best elicited by a ___ duration sound like a click or tone-burst
-Can get ___ specific info
-SP gave us ___/___ information and the AP gives us ___ specific information with a very short duration sound generated by that connection of the IHC and the 8th nerve -___ response; nothing should cross over |
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Definition
| IHC; distal; short; freq; envelope/phase; freq; Ipsilateral |
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Term
Surgical Electrodes:
-Need electrodes placed on ___ through the TM; Look for a similar response on ___ ___ candidates; response is ___ times greater than an electrode placed on the TM |
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Definition
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Term
-Tip-trodes get ___ if you use a Gell or paste; can give us good info about the ___ ___ and ___ ___
-Transtympanic electrode gives us the ___ quality. Gives a __-__times greater response but the downside is you have to use an ___ because it's not comfortable for a needle to pierce your TM
-not usually placed by an ___
-No significant ___ change based on where you put your electrode
-places that are extra-tympanic you can place an electrode: _____________________; we can place all of these as an audiologist
-If you aren't seeing a good SP or AP move the electrode closer to the _________
-Use normative data for the specific ___ you are using. |
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Definition
| slippery; SP; AP; best; 10; 40; anesthetic; audiologist; latency; earlobe, forehead, mastoid, top of the head, canal, and on the TM; sight of generation; electrode Ex: If you are using a tip-trode get data for tip-trodes |
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Term
Stimulus Factors-Transducer:
-What transducer do you usually use?
-These can be ___ |
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Definition
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Term
Stimulus Factors:
-What are some stimulus types? What is the most common?
-Duration: Dictated by your stimulus ___; For an AP you must have a ___ stimulus. The ___ your duration the more effective you will be at producing an AP. But if you go too short you will lose your ___ ___. Must find a balance. |
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Definition
| click, tone-burst, and a chirp; click is most common but you can use a tone-burst when looking for Meniere's disease; type; transient; shorter; SP |
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Term
Stimulus Factors:
-Rate: AP and SP can respond at ___ rates. Not heavily ___ by rate. AP will increase if rate is ___ and ___ latency a little bit.
-Polarity: To get an SP you have to ___ the polarity. To get an AP you have to change it to ___ or ___. Need to know if OHC are working properly and the ___ ___ will tell us that.
-Monaural/Binaural: If you present binaurally for an ECochG it will ___ your amplitudes |
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Definition
| slow; influenced; increased; decrease; alternate; rarefaction; condensation; CM; reduce |
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Term
Acquisition Factors:
-Time window is set to capture that ___ ms and to capture it if it's delayed. Typically we will do a __-__ ms time window directly following the stimulus. Often times you will have an additional __-__ ms prior to the stimulus. Notated by a ___ number. Ex: time window was set to -1 to 5 ms for a total of 6 ms. Why is that important? Need to know where the ___ is.
->__ ms in order to not change your response. |
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Definition
| 1.5; 5-10; 1-2; negative; baseline; 0.2 |
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Term
Acquisition Factors:
-As you go up the auditory pathway our responses get ___. If we let the larger responses into your time window then they will ___ the smaller responses (SP AP ratio).
-Amplification: Affected by ___ and ___. If you use a lower stimulus you may need a ___ time window.
-You want a minimum of ___ sweeps and you will stop when your waveform looks ___. |
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Definition
| larger; obscure; intensity; frequency; longer; 500; stable |
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Term
Acquisition Factors:
-Filter settings: high pass filter needs to be set as ___ as we can (__-__ Hz) so everything above that can come through. If you don't get a response ___ your high pass filter up to 100 Hz. If you set it higher than 100 Hz you will lose your ___ response.
-Low pass filter to ___ Hz to capture best SP and AP |
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Definition
| low; 10-30; increase; SP; 1500 |
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Term
| You can record an ECochG down to ___ weeks gestational age (latencies will be longer though because pathways are myelinated yet). |
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Definition
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Term
Age:
-In older adults the ___ starts to disappear. The __HCs are decreasing in function.
-How can we enhance this SP response?
-___ changes as we age. Amplitude of AP ___. Less __HC as we age. |
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Definition
| SP; O; Slow our rate and make a longer duration. Increase intensity. Move electrodes closer to site of generation; Ratio; decreases; I |
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Term
| Minimize ___ movement because it can obscure responses |
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Definition
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Term
ECochG Protocol Guidelines - Stimulus:
-Transducer: ___
-Type: ___
-Duration: ___ ms
-Polarity: ___
-Rate: ___ seconds
-Intensity: __ to __ dB nHL
-Masking: ___
-Presentation: ___ |
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Definition
| ER-3A; click; 0.1; alternating; 7.1; 70-90; none; monaural |
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Term
ECochG Protocol Guidelines - Acquisition:
-Filter: __-__ Hz
-Analysis Time: __ or __ ms
-Amplification: x___
-Sweeps: less than ___ to more than ___ |
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Definition
| 10-1500; 5 or 15; 75,000; 50; 1500 |
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Term
| In order to elicit an SP you need to be at least ___ dB peak SPL |
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Definition
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Term
| If you have a large SP that's what ___ looks like. It's almost as big as the AP |
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Definition
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Term
| What are the applications of an ECochG? |
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Definition
-Enhances wave I of ABR
-Diagnosis of ANSD (auditory neuropathy spectrum disorder)
-Diagnosis of Meniere’s disease
-Intraoperative monitoring
-Estimation of auditory threshold |
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