LXIV Averaged Evoked Myogenic and Cortical Potentials to Sound in Man

Dt, Cody; Jl, Jacobson; Jc, Walker; Rg, Bickford

doi:10.1177/000348946407300315

Cited by 85 publications

(37 citation statements)

References 9 publications

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“…One of the standard, non-invasive and objective tests for hearing impairment involves numerically averaging the (electrical) auditory evoked response (AER) at the skin surface during presentation of repetitive clicks or tone bursts [Bickford et al, 1963Cody et al, 1964;Davis, 1976;Hall, 1992;Schwarz et al, 1994;Streletz et al, 1977]. The human AER consists of an early component (0-12 ms) which includes the brainstem auditory evoked response (BAER), an auditory middle-latency response (12-50 ms), dominated in many cases by the myogenic postauricular muscle response (PAMR) [Bochenek and Bochenek, 1976;Davis et al, 1965;De Grandis and Santoni, 1980;Douek et al, 1973Douek et al, , 1974Douek et al, , 1975Dus and Wilson, 1975;Gibson, 1975], and a series of longer-latency responses occurring 50-1000 ms after the acoustic stimulus.…”

Section: Introductionmentioning

confidence: 99%

Auditory Evoked Response Test Strategies to Reduce Cost and Increase Efficiency: The Postauricular Muscle Response Revisited

Patuzzi

Thomson

2000

Audiol Neurotol

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We describe a number of techniques in auditory evoked response (AER) testing for hearing loss which should decrease its cost and increase its efficiency, making its use in infant hearing screening more viable. We demonstrate the use of bit-stream averaging of the electrical signals from the head as a cheap alternative to analogue averaging and show that the average waveforms obtained are similar with both techniques. We demonstrate how the postauricular muscle response (PAMR) can be potentiated by lateral rotation of the eyes and argue that uncontrolled eye movements in previous studies have led to an unfounded belief that the PAMR is not stable. When eye rotation is used to potentiate the PAMR, the response becomes very stable and so large in most subjects that it is clearly visible in the raw traces. We also demonstrate that when the PAMR is potentiated by eye rotation, stable PAMR waveforms can be reliably obtained with tone bursts with frequencies up to and above 8 kHz and with sound levels within 30 dB of the subjective detection threshold. As a result the PAMR can be used to rapidly determine an objective audiogram in most subjects within minutes. Finally, we demonstrate a correlation technique for detecting the PAMR without waveform averaging and the need for an expensive computer. We are sure that a combination of these techniques can be used to increase the efficiency of AER screening for infant deafness and lower its cost dramatically.

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Section: Introductionmentioning

confidence: 99%

Auditory Evoked Response Test Strategies to Reduce Cost and Increase Efficiency: The Postauricular Muscle Response Revisited

Patuzzi

Thomson

2000

Audiol Neurotol

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“…When observing a study of middle latency potential, we observe responses within a period of 12 to 50 ms. In order to study the middle latency, we used VEMP in the following parameters: surface electrodes were placed on sternocleidomastoid muscle because responses are more consistent and homogenous, in addition to being a more practical and comfortable method to the patients [3][4][5][6][7][8] , rarefaction clicks, frequency of 2Hz and pass filter that ranged from 20 to 1000Hz. There is variation of frequency range described in the literature.…”

Section: Discussionmentioning

confidence: 99%

Potencial evocado miogênico vestibular: novas perspectivas diagnósticas em esclerose múltipla

Aidar¹,

Suzuki²

2005

Rev. Bras. Otorrinolaringol.

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Aim:To evaluate vestibular evoked myogenic potentials in patients with multiple sclerosis as method of diagnostic support. Study design: Case-control. Material and Method: We studied a group of normal individuals (n=15) and a Studied group (n=15) that comprised patients with diagnosis of multiple sclerosis. Both groups were submitted to vestibular evoked myogenic potential exam. In each ear it was applied 200 stimuli by clicks and repeated for 2 consecutive cycles with the purpose of evaluating reproducibility. The active electrode of surface was put on the superior S ‡of sternocleidomastoid muscle and the reference electrode on the anterior border of the clavicle. The individuals were instructed to rotate theirs head to the opposite side to the stimulated ear. Results: Vestibular evoked myogenic potential responses were prompt, reproducible and biphasic. The latency of wave P1 and N2 and P1-N2 amplitude showed a higher value in the studied group when compared with the normal group. There was no significant difference when the ears were compared in P1 and N2 amplitude. We noticed that individuals with multiple sclerosis showed no response in 30% of the cases. In evaluating the individuals of the Studied group with otoneurology symptoms and compared with individuals without symptoms, it was observed that P1 and N2 latencies and P1-N2 amplitude were higher in symptomatic cases. Conclusion: Vestibular evoked myogenic potential was considered a good method of diagnostic support of vestibulospinal tract in cases of multiple sclerosis.

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“…For proper recording, it is necessary that the patient push his/her head back, using the back of the neck 5,6,33 . In order to do this, we use a cuff placed between the back of the neck and the chair's head rest and we set the pressure through the device's pressure gauge, and in our studies we used the value of 20mm of mercury as standard pressure.…”

Section: Recording At the Vertex And Inionmentioning

confidence: 99%

“…Historically, vestibular evoked potentials by sound stimulation were researched by investigators of the cortical auditory evoked potentials [5][6][7] . Initially, to record these potentials, the active electrodes were positioned on the scalp: inion and retroauricular region.…”

Section: Introductionmentioning

confidence: 99%

Potenciais miogênicos evocados vestibulares: metodologias de registro em homens e cobaias

Oliveira

David

Colafêmina

2008

Rev. Bras. Otorrinolaringol.

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The vestibular evoked myogenic potential (VEMP) is a clinical test that assess the vestibular function by means of an inhibitory vestibulo-neck reflex, recorded in body muscles in response to high intensity acoustic stimuli. Aim: To check and analyze the different methods used to record VEMPs in humans and in guinea pigs. Materials and Methods: We researched the following databases: MEDLINE, LILACS, SCIELO and COCHRANE. Results: we noticed discrepancies in relation to the ways used to record the vestibular evoked myogenic potentials in relation to the following factors: patient position at the time of recording, type of sound stimulus used (clicks or tone bursts), parameters for stimuli mediation (intensity, frequency, duration of presentation, filters, response amplification gain and windows for stimulus recording), type of phone used and way of stimulus presentation (mono or binaural, ipsi or contralateral). Conclusion: There is no consensus in the literature as to the best recording method for vestibular evoked myogenic potentials. We need more specific studies in order to compare these recordings and establish a standard model to use it in the clinical practice.

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LXIV Averaged Evoked Myogenic and Cortical Potentials to Sound in Man

Cited by 85 publications

References 9 publications

Auditory Evoked Response Test Strategies to Reduce Cost and Increase Efficiency: The Postauricular Muscle Response Revisited

Auditory Evoked Response Test Strategies to Reduce Cost and Increase Efficiency: The Postauricular Muscle Response Revisited

Potencial evocado miogênico vestibular: novas perspectivas diagnósticas em esclerose múltipla

Potenciais miogênicos evocados vestibulares: metodologias de registro em homens e cobaias

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