A Comparison of Extratympanic versus Transtympanic Recordings in Electrocochleography

Noguchi, Yoshihiro; Nishida, Hiroaki; Komatsuzaki, Atsushi

doi:10.3109/00206099909073015

Cited by 29 publications

(26 citation statements)

References 24 publications

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“…The age difference between the FRDA patient and the control groups cannot be considered a major limitation since both the amplitude and the latency of the CAP peak recorded in children in response to click stimulation were comparable with the corresponding values reported in other studies for normally hearing and hearing-impaired adults [12,13] . This is in line with what we know about the timing of maturation processes in the cochlea and auditory nerve in developmental age [14] .…”

Section: Electrocochleographysupporting

confidence: 66%

Abnormal Cochlear Potentials in Friedreich's Ataxia Point to Disordered Synchrony of Auditory Nerve Fiber Activity

et al. 2015

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Section: Electrocochleographysupporting

confidence: 66%

Abnormal Cochlear Potentials in Friedreich's Ataxia Point to Disordered Synchrony of Auditory Nerve Fiber Activity

et al. 2015

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“…Hence, our data support the possibility that the concha electrode can be used as an alternative to a canal recording in the assessment of cochlear function. In fact, other investigators (Noguchi, Nishida, & Komatsuzaki, 1999) have shown similar values for CM detection thresholds (<35 dB nHL) when extratympanic (canal) and transtympanic recordings are compared in human participants with normal hearing. This information suggests that concha recordings may well be useful in screening at-risk populations with possible hearing loss.…”

Section: Amplitude At Different Recording Locationsmentioning

confidence: 60%

Using Concha Electrodes to Measure Cochlear Microphonic Waveforms and Auditory Brainstem Responses

Zhang

2010

Trends in Amplification

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During electrocochleography, that is, ECochG or ECoG, a recording electrode can be placed in the ear canal lateral to the tympanic membrane. We designed a concha electrode to record both sinusoidal waveforms of cochlear microphonics (CMs) and auditory brainstem responses (ABRs). The amplitudes of CM waveforms and Wave I or compound action potentials (CAPs) recorded at the concha were greater than those recorded at the mastoid but slightly lower than those recorded at the ear canal. Wave V amplitudes recorded at the concha were greater than those recorded at the ear canal but lower than those recorded at the mastoid. There was not a significant difference between the amplitudes recorded at the concha and at the ear canal. For CM and Wave I or CAP, the latency recorded at the concha was longer than at the canal but shorter than at the mastoid; for Wave V, the reverse was true. However, these differences were not statistically significant and may be due to the distance to response generators. Aside from the advantages that the regular ECoG has over otoacoustic emission (OAE) testing, the concha electrode was also easier and safer to place and may be suitable for children, newborn screening, participants with canal conditions, and remote clinics which could have concerns with the availability and cost of a canal electrode. Using concha electrodes, we also experienced fewer postauricular artifacts than when using a mastoid electrode.

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“…For ECOG, electrodes are typically positioned transtympanically on the middle ear promontory of the pathological ear. 45,53,65,80,95,96,101,123 Reference and ground electrodes are placed on the ipsilateral earlobe and on the forehead, respectively. 64,113,114,149 A foam ear plug not only holds the electrode firmly in place but also impedes foreign substances from breaching into the ear canal.…”

Section: Electrocochleography and Direct Cnapsmentioning

confidence: 99%

“…49,96,120,149 To circumvent this issue, alternative but viable options include tympanic or extratympanic electrode placement. 95,113,144 Electrocochleography can prove technically challenging as well. The electrode must be held securely in place; moving it manually or unintentionally can induce changes in the baseline amplitude and latency, thus exacerbating the difficulty of making subsequent comparisons.…”

Section: Electrocochleography and Direct Cnapsmentioning

confidence: 99%

Intraoperative neuromonitoring techniques in the surgical management of acoustic neuromas

Oh¹,

Nagasawa²,

Fong³

et al. 2012

FOC

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Unfavorable outcomes such as facial paralysis and deafness were once unfortunate probable complications following resection of acoustic neuromas. However, the implementation of intraoperative neuromonitoring during acoustic neuroma surgery has demonstrated placing more emphasis on quality of life and preserving neurological function. A modern review demonstrates a great degree of recent success in this regard. In facial nerve monitoring, the use of modern electromyography along with improvements in microneurosurgery has significantly improved preservation. Recent studies have evaluated the use of video monitoring as an adjunctive tool to further improve outcomes for patients undergoing surgery. Vestibulocochlear nerve monitoring has also been extensively studied, with the most popular techniques including brainstem auditory evoked potential monitoring, electrocochleography, and direct compound nerve action potential monitoring. Among them, direct recording remains the most promising and preferred monitoring method for functional acoustic preservation. However, when compared with postoperative facial nerve function, the hearing preservation is only maintained at a lower rate. Here, the authors analyze the major intraoperative neuromonitoring techniques available for acoustic neuroma resection.

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A Comparison of Extratympanic versus Transtympanic Recordings in Electrocochleography

Cited by 29 publications

References 24 publications

Abnormal Cochlear Potentials in Friedreich's Ataxia Point to Disordered Synchrony of Auditory Nerve Fiber Activity

Abnormal Cochlear Potentials in Friedreich's Ataxia Point to Disordered Synchrony of Auditory Nerve Fiber Activity

Using Concha Electrodes to Measure Cochlear Microphonic Waveforms and Auditory Brainstem Responses

Intraoperative neuromonitoring techniques in the surgical management of acoustic neuromas

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