Term
| How do you set up the electrodes for an ABR? |
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Definition
-Cz/Fz: crown of head/ high forehead for non-inverting. Plugs in +1 or +2
-Fpz: low forehead (common) ground. Plugs in the middle.
-Right inverting (A2). Plugs into -2 plugin.
-Left inverting (A1). Pugs into -1 plugin. |
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Term
| resistance to energy flow through an electrode |
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Definition
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Term
| Electrode impedance should be no greater than ___ ohms |
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Definition
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Term
| Inter-electrode impedance should be less than __ kOhm |
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Definition
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Term
Protocol for neurodiagnostic ABR:
-high intensity stimuli (e.g. ___ or ___ dB nHL)
-identify & measure absolute & inter-peak latencies of waves ___, ___, and ___
-I-V interpeak interval should be about ___ ms
-compare ___ & ____ latencies to normative values |
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Definition
| 70 or 80; I, III, & V; 4; absolute; inter-peak |
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Term
| stimulus level is referred to average threshold for a group of young adults with normal hearing |
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Definition
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Term
| 0 dB nHL = about ___-___ dB peSPL |
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Definition
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Term
| How can you enhance wave 1? |
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Definition
| Increase intensity, use rarefaction polarity, move electrode closer to site of generation, and slow down the click rate to 11.1 or 21.1 c/s. |
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Term
| What are normal absolute latencies for click ABR? |
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Definition
Wave I = 1.5 msec
Wave III = 3.5 msec
Wave V = 5.5 msec |
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Term
| What are normal interpeak latencies for click ABR? |
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Definition
1-3=2.14 ms
3-5=1.94 ms
1-5=4.08 ms |
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Term
Interpretation:
Normal inter-peak latencies; poor overall waveform morphology |
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Definition
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Term
Interpretation:
Normal inter-peak latencies; prolonged absolute latencies of all waves |
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Definition
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Term
Interpretation:
-Prolonged latencies of later waves and prolonged inter-peak latencies; ABR may be absent |
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Definition
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Term
Interpretation:
Abnormal ABR |
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Definition
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Term
| What are the 5 anatomical wave generators? |
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Definition
Wave I = distal 8th nerve
Wave II = proximal 8th nerve
Wave III = cochlear nucleus
Wave IV = SOC
Wave V = lateral lemniscus (At contralateral IC) |
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Term
What kind of test results would you find for auditory neuropathy for:
-OAEs
-ABR
-Reflexes
-Audiometry |
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Definition
-characterized by normal cochlear OHC function - present OAEs
-abnormal ABR - disappears when use alternating. Present CM
-absent reflexes
-threshold and supra-threshold hearing disorders of varying degrees |
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Term
| What are the correction factors for infant tone-burst ABR? |
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Definition
500 Hz: 15-20 dB
1000 Hz: 10-15 dB
2000 Hz: 10-15 dB
4000 Hz: 10-15 dB |
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Term
| What results would you expect for an adult with a retrocochlear lesion? |
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Definition
| prolonged latencies of later waves and prolonged inter-peak latencies; ABR may be absent |
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Term
| What are the applications for 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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Term
| Intensity levels can go as high as ___ dB HL for an ASSR |
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Definition
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Term
| ASSR requires a ___ state of arousal and is influenced by ___ ___ and ___ |
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Definition
| quiet; deep sedation and anesthesia |
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Term
| What is the primary application for ASSR? |
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Definition
| Primary application is behavioral threshold estimation |
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