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Electrocochleography

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https://www.readbyqxmd.com/read/28919848/hidden-hearing-loss-no-effect-of-common-recreational-noise-exposure-on-cochlear-nerve-response-amplitude-in-humans
#1
Sarah K Grinn, Kathryn B Wiseman, Jason A Baker, Colleen G Le Prell
This study tested hypothesized relationships between noise exposure and auditory deficits. Both retrospective assessment of potential associations between noise exposure history and performance on an audiologic test battery and prospective assessment of potential changes in performance after new recreational noise exposure were completed. Methods: 32 participants (13M, 19F) with normal hearing (25-dB HL or better, 0.25-8 kHz) were asked to participate in 3 pre- and post-exposure sessions including: otoscopy, tympanometry, distortion product otoacoustic emissions (DPOAEs) (f2 frequencies 1-8 kHz), pure-tone audiometry (0...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28798660/human-summating-potential-using-continuous-loop-averaging-deconvolution-response-amplitudes-vary-with-tone-burst-repetition-rate-and-duration
#2
Alana E Kennedy, Wafaa A Kaf, John A Ferraro, Rafael E Delgado, Jeffery T Lichtenhan
Electrocochleography (ECochG) to high repetition rate tone bursts may have advantages over ECochG to clicks with standard slow rates. Tone burst stimuli presented at a high repetition rate may enhance summating potential (SP) measurements by reducing neural contributions resulting from neural adaptation to high stimulus repetition rates. To allow for the analysis of the complex ECochG responses to high rates, we deconvolved responses using the Continuous Loop Averaging Deconvolution (CLAD) technique. We examined the effect of high stimulus repetition rate and stimulus duration on SP amplitude measurements made with extratympanic ECochG to tone bursts in 20 adult females with normal hearing...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28769753/intraoperative-electrocochleographic-characteristics-of-auditory-neuropathy-spectrum-disorder-in-cochlear-implant-subjects
#3
William J Riggs, Joseph P Roche, Christopher K Giardina, Michael S Harris, Zachary J Bastian, Tatyana E Fontenot, Craig A Buchman, Kevin D Brown, Oliver F Adunka, Douglas C Fitzpatrick
Auditory neuropathy spectrum disorder (ANSD) is characterized by an apparent discrepancy between measures of cochlear and neural function based on auditory brainstem response (ABR) testing. Clinical indicators of ANSD are a present cochlear microphonic (CM) with small or absent wave V. Many identified ANSD patients have speech impairment severe enough that cochlear implantation (CI) is indicated. To better understand the cochleae identified with ANSD that lead to a CI, we performed intraoperative round window electrocochleography (ECochG) to tone bursts in children (n = 167) and adults (n = 163)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28769744/the-auditory-nerve-overlapped-waveform-anow-detects-small-endolymphatic-manipulations-that-may-go-undetected-by-conventional-measurements
#4
Jeffery T Lichtenhan, Choongheon Lee, Farah Dubaybo, Kaitlyn A Wenrich, Uzma S Wilson
Electrocochleography (ECochG) has been used to assess Ménière's disease, a pathology associated with endolymphatic hydrops and low-frequency sensorineural hearing loss. However, the current ECochG techniques are limited for use at high-frequencies only (≥1 kHz) and cannot be used to assess and understand the low-frequency sensorineural hearing loss in ears with Ménière's disease. In the current study, we use a relatively new ECochG technique to make measurements that originate from afferent auditory nerve fibers in the apical half of the cochlear spiral to assess effects of endolymphatic hydrops in guinea pig ears...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28704892/is-electrocochleography-still-helpful-in-early-diagnosis-of-meniere-disease
#5
Fulvio Mammarella, Melissa Zelli, Theodoros Varakliotis, Alberto Eibenstein, Claudio Maria Pianura, Gianluca Bellocchi
BACKGROUND AND OBJECTIVES: Despite the extensive research for the Meniere's disease (MD), it's pathophysiology still remains uncertain and questionable among scientists. Clinical symptoms and audiometric tests form the basis for the diagnosis. Nevertheless the differential diagnosis can be extremely challenging, due to subjective and not specific results. Incorrect diagnosis is most likely and for this reason there is a great demand for objective and reliable tests. SUBJECTS AND METHODS: The presence of endolymphatic hydrops is necessary condition but non enough for the diagnosis...
July 2017: Journal of Audiology & Otology
https://www.readbyqxmd.com/read/28700398/the-role-of-preoperative-steroids-in-atraumatic-cochlear-implantation-surgery
#6
Jonathon Lo, Luke Campbell, Phillip Sale, Scott Chambers, Amy Hampson, Hayden Eastwood, Stephen O'Leary
HYPOTHESIS: Depth of insertion is related to the extent of tissue response and low frequency hearing loss. Intravenous steroids have greatest effect in reducing postimplantation fibrosis and hearing loss in the presence of significant electrode insertion trauma, when compared with saline treatment. BACKGROUND: Experiments exploring the enhancement of cochlear implantation (CI) outcomes with glucocorticosteroids have produced mixed results, possibly due to lack of standardization of the CI model...
September 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28688553/clinical-role-of-electrocochleography-in-children-with-auditory-neuropathy-spectrum-disorder
#7
Tatyana E Fontenot, Christopher K Giardina, Holly F Teagle, Lisa R Park, Oliver F Adunka, Craig A Buchman, Kevin D Brown, Douglas C Fitzpatrick
OBJECTIVES: To assess electrocochleography (ECochG) to tones as an instrument to account for CI speech perception outcomes in children with auditory neuropathy spectrum disorder (ANSD). MATERIALS & METHODS: Children (<18 years) receiving CIs for ANSD (n = 30) and non-ANSD (n = 74) etiologies of hearing loss were evaluated with ECochG using tone bursts (0.25-4 kHz). The total response (TR) is the sum of spectral peaks of responses across frequencies. The compound action potential (CAP) and the auditory nerve neurophonic (ANN) in ECochG waveforms were used to estimate nerve activity and calculate nerve score...
August 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28674482/feasibility-of-using-electrocochleography-for-objective-estimation-of-electro-acoustic-interactions-in-cochlear-implant-recipients-with-residual-hearing
#8
Kanthaiah Koka, Leonid M Litvak
Although cochlear implants (CI) traditionally have been used to treat individuals with bilateral profound sensorineural hearing loss, a recent trend is to implant individuals with residual low-frequency hearing. Patients who retain some residual acoustic hearing after surgery often can benefit from electro-acoustic stimulation (EAS) technologies, which combine conventional acoustic amplification with electrical stimulation. However, interactions between acoustic and electrical stimulation may affect outcomes adversely and are time-consuming and difficult to assess behaviorally...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28670263/tone-burst-electrocochleography-for-the-diagnosis-of-clinically-certain-meniere-s-disease
#9
REVIEW
Jeremy Hornibrook
The technique of transtympanic electrocochleography was initially developed as an objective hearing threshold test by Eggermont. Gibson et al. (1977) claimed that an enlarged direct current component of the action potential (AP) called the summating potential (SP) is an indication of endolymphatic hydrops, later confirmed by Coates who proposed an SP/AP ratio measure. This led to numerous publications using diagnostic ratios of 0.33-0.35. The insensitivity led to an eventual disenchantment with the test as a reliable objective test for Meniere's disease...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28634435/the-clinical-uses-of-electrocochleography
#10
REVIEW
William P Gibson
The clinical uses of electrocochleography are reviewed with some technical notes on the apparatus needed to get clear recordings under different conditions. Electrocochleography can be used to estimate auditory thresholds in difficult to test children and a golf club electrode is described. The same electrode can be used to obtain electrical auditory brainstem responses (EABR). Diagnostic testing in the clinic can be performed with a transtympanic needle electrode, and a suitable disposable monopolar electrode is described...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28620284/electrophysiological-measurements-of-peripheral-vestibular-function-a-review-of-electrovestibulography
#11
REVIEW
Daniel J Brown, Christopher J Pastras, Ian S Curthoys
Electrocochleography (EcochG), incorporating the Cochlear Microphonic (CM), the Summating Potential (SP), and the cochlear Compound Action Potential (CAP), has been used to study cochlear function in humans and experimental animals since the 1930s, providing a simple objective tool to assess both hair cell (HC) and nerve sensitivity. The vestibular equivalent of ECochG, termed here Electrovestibulography (EVestG), incorporates responses of the vestibular HCs and nerve. Few research groups have utilized EVestG to study vestibular function...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28611574/intra-and-postoperative-electrocochleography-may-be-predictive-of-final-electrode-position-and-postoperative-hearing-preservation
#12
Brendan P O'Connell, Jourdan T Holder, Robert T Dwyer, René H Gifford, Jack H Noble, Marc L Bennett, Alejandro Rivas, George B Wanna, David S Haynes, Robert F Labadie
Introduction: The objectives of the current study were to (1) determine the relationship between electrocochleography (ECochG), measured from the cochlear implant (CI) electrode array during and after implantation, and postoperative audiometric thresholds, (2) determine the relationship between ECochG amplitude and electrode scalar location determined by computerized tomography (CT); and (3) determine whether changes in cochlear microphonic (CM) amplitude during electrode insertion were associated with postoperative hearing...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28607824/electrocochleography-summating-potential-seen-on-auditory-brainstem-response-in-a-case-of-superior-semicircular-canal-dehiscence
#13
Bryan K Ward, Angela Wenzel, Eva K Ritzl, John P Carey
BACKGROUND: Superior canal dehiscence syndrome (SCDS) is a condition in which an abnormal communication between the superior semicircular canal and the middle cranial fossa causes patients to hear internal noises transmitted loudly to their affected ear as well as to experience vertigo with pressure changes or loud sounds. Patients with SCDS can have an elevated ratio of summating potential (SP) to action potential (AP) as measured by electrocochleography (ECochG). Changes in this ratio have been observed during surgical intervention to correct this abnormal communication...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28589104/intratympanic-injection-of-dexamethasone-and-electrocochleographic-data-in-cases-of-definite-one-sided-refractory-meniere-s-disease
#14
Sasan Dabiri Satri, Reza Gharibi, Farzaneh Nejadian, Nasrin Yazdani, Reza Hoseinabadi, Nima Rezazadeh, Mohammad Reza Firouzifar, Saeed Babaei
INTRODUCTION: Meniere's disease (MD) is a disease of the inner ear that presents itself with repeated episodes of vertigo (96.2%), tinnitus (91.1%), and sensorineural hearing loss (87.7 %). In this article we sought to assess the effects of intratympanic (IT) injections of dexamethasone on definite cases of MD using electrocochleography (ECOG). MATERIALS AND METHODS: In this hospital-based case series in 36 patients, we measured audiometric values and ECOG in all patients before, 1 month and 6 months after 4-mg/mL IT injections of dexamethasone...
May 2017: Iranian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/28514787/delayed-effect-of-active-pressure-treatment-on-endolymphatic-hydrops
#15
Edoardo Covelli, Luigi Volpini, Francesca Atturo, Anna Teresa Benincasa, Chiara Filippi, Silvia Tarentini, Vania Marrone, Simonetta Monini, Annarita Vestri, Maurizio Barbara
OBJECTIVE: To identify eventual correlations between the effect of low-pressure treatment and endolymphatic hydrops in Ménière patients. MATERIAL AND METHODS: The study group consisted of subjects affected by definite Ménière disease (2015) and a severe degree of disability, who received a ventilation tube with or without a low-pressure treatment before undergoing a surgical procedure (vestibular neurectomy). After the placement of the ventilation tube, the subjects were either left alone with the tube or received 1 month of self-administered low-pressure therapy with a portable device...
2017: Audiology & Neuro-otology
https://www.readbyqxmd.com/read/28498269/real-time-intracochlear-electrocochleography-obtained-directly-through-a-cochlear-implant
#16
Michael S Harris, William Jason Riggs, Kanthaiah Koka, Leonid M Litvak, Prashant Malhotra, Aaron C Moberly, Brendan P O'Connell, Jourdan Holder, Federico Alberto Di Lella, Carlos Mario Boccio, George B Wanna, Robert F Labadie, Oliver F Adunka
HYPOTHESIS: Utilizing the cochlear implant to record electrophysiologic responses during device placement is a feasible and efficacious technique for monitoring near real-time cochlear physiology during and following electrode insertion. BACKGROUND: Minimizing intracochlear trauma during cochlear implantation has emerged as a highly researched area to help improve patient performance. Currently, conventional cochlear implant technology allows for the recording of electrically evoked compound action potentials (eCAPs)...
July 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28469553/intracochlear-recordings-of-acoustically-and-electrically-evoked-potentials-in-nucleus-hybrid-l24-cochlear-implant-users-and-their-relationship-to-speech-perception
#17
Jae-Ryong Kim, Viral D Tejani, Paul J Abbas, Carolyn J Brown
The Hybrid cochlear implant (CI) has been developed for individuals with high frequency hearing loss who retain good low frequency hearing. Outcomes have been encouraging but individual variability is high; the health of the cochlea and the auditory nerve may be important factors driving outcomes. Electrically evoked compound action potentials (ECAPs) reflect the response of the auditory nerve to electrical stimulation while electrocochleography (ECochG) reflects the response of the cochlear hair cells and auditory nerve to acoustic stimulation...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28458630/an-objective-estimation-of-air-bone-gap-in-cochlear-implant-recipients-with-residual-hearing-using-electrocochleography
#18
Kanthaiah Koka, Aniket A Saoji, Joseph Attias, Leonid M Litvak
Although, cochlear implants (CI) traditionally have been used to treat individuals with bilateral profound sensorineural hearing loss, a recent trend is to implant individuals with residual low-frequency hearing. Notably, many of these individuals demonstrate an air-bone gap (ABG) in low-frequency, pure-tone thresholds following implantation. An ABG is the difference between audiometric thresholds measured using air conduction (AC) and bone conduction (BC) stimulation. Although, behavioral AC thresholds are straightforward to assess, BC thresholds can be difficult to measure in individuals with severe-to-profound hearing loss because of vibrotactile responses to high-level, low-frequency stimulation and the potential contribution of hearing in the contralateral ear...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28439223/outer-hair-cell-and-auditory-nerve-function-in-speech-recognition-in-quiet-and-in-background-noise
#19
Richard Hoben, Gifty Easow, Sofia Pevzner, Mark A Parker
The goal of this study was to describe the contribution of outer hair cells (OHCs) and the auditory nerve (AN) to speech understanding in quiet and in the presence of background noise. Fifty-three human subjects with hearing ranging from normal to moderate sensorineural hearing loss were assayed for both speech in quiet (Word Recognition) and speech in noise (QuickSIN test) performance. Their scores were correlated with OHC function as assessed via distortion product otoacoustic emissions, and AN function as measured by amplitude, latency, and threshold of the VIIIth cranial nerve Compound Action Potential (CAP) recorded during electrocochleography (ECochG)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28386212/characterizing-electrocochleography-in-cochlear-implant-recipients-with-residual-low-frequency-hearing
#20
Christofer W Bester, Luke Campbell, Adrian Dragovic, Aaron Collins, Stephen J O'Leary
Objective: Lay the groundwork for using electrocochleography (ECochG) as a measure of cochlear health, by characterizing typical patterns of the ECochG response observed across the electrode array in cochlear implant recipients with residual hearing. Methods: ECochG was measured immediately after electrode insertion in 45 cochlear implant recipients with residual hearing. The Cochlear Response Telemetry system was used to record ECochG across the electrode array, in response to 100- or 110-dB SPL pure tones at 0...
2017: Frontiers in Neuroscience
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