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Atypical auditory EP

Atypical auditory evoked potentials

QuestionAnswer
The following is not considered a routine cause for AEP testing in neonates: Prematurity, anoxic ancephalopathy, hyperbilirubinemia, perinatal stroke hyperbilirubinemia
The following is not considered a routine cause for AEP testing in neonates: Developmental anomalities, meningitis, kernicterus, recurrent apnea recurrent apnea
The most common abnormality in neonatal BAEPs increased IPL I-V
Middle latency AEPs are most effective with a rise time of __ msec 5
Middle latency AEPs with a rise time of more than __ msec produce an unstable response 25
Stimulation rates for middle latency AEPs may be up to __ per second without a change in response 15
At rates > 15 per second, the amplitude of middle latency AEP __ (increases/decreases) decreases
At rates > 15 per second for middle latency AEPs, there is a change in the __ (amplitude, latency) of the response amplitude
MLAEP is composed typically of _#_ waves 5
Name the 5 waves of MLAEPs No, Po, Na, Pa, NB
The 6th peak found occasionally with MLAEPs is named Nb
The first peak seen with MLAEPs is called __ and is seen between __ and __ msec No, 8, 10
The second peak seen with MLAEPs is called __ and is seen between __ and __ msec Po, 10, 13
The third peak seen with MLAEPs is called __ and is seen between __ and __ msec Na, 16, 30
The fourth peak seen with MLAEPs is called __ and is seen between __ and __ msec Pa, 30, 45
The fifth peak seen with MLAEPs is called __ and is seen between __ and __ msec Nb, 40, 60
The sixth peak seen with SOME MLAEPs is called __ and is seen between __ and __ msec Pb, 50, 90
Unilateral temporal lobe lesions usually leave the __ and __ components of the MLAEP intact Na, Pa
Bilateral temporal lobe lesions abolish the -_ MLAEP
The 40 Hz AEP is recorded with electrodes on the __ and the stimulated ear forehead
The 40 Hz AEP is recorded using a bandwidth of __ - ___ Hz 10, 100
The 40 Hz AEP has a threshold of about __ dB above hearing threshold during wakefulness, and may be used to test pips of a wide range of tonal frequencies (including low frequencies) 35
Myogenic potentials are __ (more/less) likely to interfere with LLAEPs than with MLAEPs less
Stimuli for LLAEPs consist of tone bursts from __ to ___ Hz 250, 2000
To avoid generating a response from the onset of the tone, the tone burst sof LLAEPs are given a gradual onset of __ - __ msec and a plateau of __ - __ msec 25, 50, 30, 50
Stimuli for an LLAEP are repeated a a frequency of __ - __ per second 0.5, 2
The three ways that LLAEP can also be elicited besides repeating a stimuli are by changes in tone __, __ and apparent ___ frequency, intensity, location
Bandwidth for LLAEPs is usually between __ and __ Hz, although a narrower band of __ - __ Hz can be used 0.2, 100, 2, 15
An average of __ - __ responses is typically used for LLAEPs 30, 100
The normal response for a LLAEP consists first of a peak, __, at __ - __ msec P1, 50, 70
The second peak on a LLAEP, __, occurs at __ - __ msec N1, 100, 150
A second positive peak, __, on an LLAEP occurs at __ - __ msec P2, 170, 200
A third positive peak, __, occurs on an LLAEP at __ msec P300, 300
The amplitude of the LLAEP __ (increases, decreases) and its latency __ (increases, decreases) as stimulus rate increases decreases, increases
The amplitude of the LLAEP __ (increases, decreases) and its latency __ (increases, decreases) as stimulus rise time increases decreases, increases
The amplitude of the LLAEP __ (increases, decreases) and its latency __ (increases, decreases) as stimulus duration increases increases, decreases
The amplitude of the LLAEP __ (increases, decreases) and its latency __ (increases, decreases) as stimulus intensity increases, although this ultimately reaches a plateau, above which increasing intensity causes a __ in amplitude increases, decreases, decrease
LLAEPs are maximal at the __ (orbit / forehead / vertex / temporal lobe) vertex
Temporoparietal lesions most commonly result in defects in the __ wave of LLAEPs N1
Increased __ in LLAEPs has been reported in friedrich's ataxia latency
The three components of ECochG auditory nerve potential, cochlear microphonic potential, summating potential
The abbreviation for the auditory nerve potential NAP
THe __ component of the ECochG is the same regardless of the polarity of clicks used NAP
The __ potential of the ECochG changes in response to the stimulus used cochlear microphonic
The two aspects of the NAP that may be altered in response to changing the polarity of clicks latency, shape
SP in ECochG is isolated by using a high frequency filter of < __ Hz of by stimulating at rates of __ to __ 100, 125, 250
At rates of __ - __ per second, the NAP is largely eliminated from the ECochG, but the summating potential is largely unaffected 125, 250
Stimulating at rates of 125 - 250 per second elminates the __ potential from the ECochG nerve action
The NAP has a latency of _ - __ msec if a stimuluis is 60 - 90 dB above threshold and __ - __ msec if it is near threshold 1, 2, 4, 6
AS the intensity of a ECochG stimulus is decreased, the latency __ (increases/decreases) and the amplitude __ (increases/decreases) increases, decreases
Stimuli under __ Hz produce unreliable NAP responses in ECochG 500
NAP threhold is an excellent measure of hearing threshold for stimuli > __ Hz but has limited reliability for stimuli below __ Hz 1000, 500
At lower frequencies, the latency of the NAP response on ECochG __ (increases / decreases) and amplitude __ (increases / decreases) increases, decreases
The __ is the compound action potential in the acoustic nerve to auditory stimuli NAP
The __ is most useful in the evaluation of __ (central/peripheral/conductive) hearing loss peripheral
The __ is the phasic component of the reaction of the cochlear hair cells to sound waves cochlear microphonic potential
The ___ consists of a series of low amplitude rhythmic waves which coincide with the peaks of a sound wave stimulus cochlear microphonic potential
The cochlear microphonic potential __ (does / does not) correlate with degree of hearing loss does not
The __ may represent a steady component of the receptor potential of the cochlear hair cells summating potentials
The summating potential has the __ (same/opposite) polarity as the NAP same
The NAP and SP in ECochG are superimposed at __ (low/high) frequencies low
Summating potential is most commonly abnormal in this disease Meniere's
___ are responses recorded from craniocervical muscles to auditory stimuli sonomotor AEPs
Sonomotor AEPS are __ (helped / worsened) by muscle tension helped
The typical stimuli for sonomotor AEPs have a __ (fast / slow) rise time and occur at an intensity of __ - __ dB above hearing level fast, 50, 80
Recordings for sonomotor AEPs are made with electrodes placed near or in __ and __ muscles; postauriculuar AEPs are recorded with electrodes ~ __ cm behind the ear referenced to an ear lobe neck, scalp, 2
Sonomotor AEPs may begin __ - __ msec after the stimulus and have a duration of __ msec 6, 50, 100
The area where sonomotor AEPs are maximal periphery of the scalp
Unilateral stimulation with sonomotor AEPs produces __ (ipsilateral / bilateral / contralateral) sonomotor AEPs bilateral
The postauriculuar AEP is also known as the _____ response crossed auricular
The postauricular AEP has a peak latency of __ - __ msec 12, 15
The __ AEP, unlike the normal sonomotor AEP, persists in sleep postauricular
Sonomotor responses __ (can, cannot) be recorded in premature infants can
Created by: schmittse