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"cochlear implant"

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https://www.readbyqxmd.com/read/28643417/congenital-deafness-affects-deep-layers-in-primary-and-secondary-auditory-cortex
#1
Christoph Berger, Daniela Kühne, Verena Scheper, A Kral
Congenital deafness leads to functional deficits in the auditory cortex for which early cochlear implantation can effectively compensate. Most of these deficits have been demonstrated functionally. Furthermore, the majority of previous studies on deafness have involved the primary auditory cortex; knowledge of higher-order areas is limited to effects of cross-modal reorganization. In this study, we compared the cortical cytoarchitecture of four cortical areas in adult hearing and congenitally deaf cats (CDCs): the primary auditory field A1, two secondary auditory fields, namely the dorsal zone (DZ) and second auditory field (A2); and a reference visual association field (area 7) in the same section stained either using Nissl or SMI-32 antibodies...
June 23, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28643327/predictive-factors-for-short-and-long-term-hearing-preservation-in-cochlear-implantation-with-conventional-length-electrodes
#2
George B Wanna, Brendan P O'Connell, David O Francis, Rene H Gifford, Jacob B Hunter, Jourdan T Holder, Marc L Bennett, Alejandro Rivas, Robert F Labadie, David S Haynes
OBJECTIVES/HYPOTHESIS: The aims of this study were to investigate short- and long-term rates of hearing preservation after cochlear implantation and identify factors that impact hearing preservation. STUDY DESIGN: Retrospective review. METHODS: Patients undergoing cochlear implantation with conventional-length electrodes and air-conduction thresholds ≤80 dB HL at 250 Hz preoperatively were included. Hearing preservation was defined as air-conduction thresholds ≤80 dB HL at 250 Hz...
June 22, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28641288/the-crista-fenestra-and-its-impact-on-the-surgical-approach-to-the-scala-tympani-during-cochlear-implantation
#3
Roberto D Angeli, Joel Lavinsky, Enio T Setogutti, Luiz Lavinsky
OBJECTIVE: The aim of this work was to describe the dimensions of the crista fenestra and determine its presence by means of high-resolution computed tomography (CT) for the purpose of cochlear implantation via the round window approach. METHODS: A series of 10 adult human temporal bones underwent high-resolution CT scanning and were further dissected for microscopic study of the round window niche. RESULTS: In all of the specimens, the round window membrane was fully visualized after the complete removal of bony overhangs...
June 23, 2017: Audiology & Neuro-otology
https://www.readbyqxmd.com/read/28641038/interaction-of-tinnitus-suppression-and-hearing-ability-after-cochlear-implantation
#4
Qian Wang, Jia-Nan Li, Guan-Xiong Lei, Dai-Shi Chen, Wei-Ze Wang, Ai-Ting Chen, Meng-Di Mong, Sun Li, Qing-Shan Jiao, Shi-Ming Yang
OBJECTIVES: To study the postoperative impact of cochlear implants (CIs) on tinnitus, as well as the impact of tinnitus on speech recognition with CI switched on. METHODS: Fifty-two postlingual deafened CI recipients (21 males and 31 females) were assessed using an established Tinnitus Characteristics Questionnaire and Tinnitus Handicap Inventory (THI) before and after cochlear implantation. The tinnitus loudness was investigated when CI was switched on and off in CI recipients with persistent tinnitus...
June 22, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28639840/categorical-loudness-scaling-in-cochlear-implant-recipients
#5
Peter A Busby, Agnes Au
OBJECTIVE: This study investigated categorical loudness scaling in a large group of cochlear implant (CI) recipients. DESIGN: Categorical loudness was measured for individually determined sets of current amplitudes on apical, mid and basal electrodes of the Nucleus array. STUDY SAMPLE: Thirty adult subjects implanted with the Nucleus CI. RESULTS: Subjects were generally reliable in categorical loudness scaling. As expected, current levels eliciting the same loudness categories differed across subjects and electrodes in many cases...
June 22, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28639367/a-polydopamine-peptide-coating-enables-adipose-derived-stem-cell-growth-on-the-silicone-surface-of-cochlear-implant-electrode-arrays
#6
Philipp Schendzielorz, Kristen Rak, Katrin Radeloff, Johannes Völker, Thomas Gehrke, Agmal Scherzad, Norbert Kleinsasser, Rudolf Hagen, Andreas Radeloff
The simultaneous application of neurotrophic factors with cochlear implantation is proposed to enhance the bioelectrical interface between electrodes and auditory neurons, and thus improve speech intelligibility in patients with cochlear implants (CIs). In cell-based approaches, the goal is to colonize CIs with cells producing neurotrophic factors. This study aims to evaluate whether a polydopamine (PD) functionalization of the hydrophobic silicone surface of the electrode carrier enables colonization of adipose-derived stem cells known to deliver neurotrophic factors...
June 22, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28638329/the-contribution-of-cognitive-factors-to-individual-differences-in-understanding-noise-vocoded-speech-in-young-and-older-adults
#7
Stephanie Rosemann, Carsten Gießing, Jale Özyurt, Rebecca Carroll, Sebastian Puschmann, Christiane M Thiel
Noise-vocoded speech is commonly used to simulate the sensation after cochlear implantation as it consists of spectrally degraded speech. High individual variability exists in learning to understand both noise-vocoded speech and speech perceived through a cochlear implant (CI). This variability is partly ascribed to differing cognitive abilities like working memory, verbal skills or attention. Although clinically highly relevant, up to now, no consensus has been achieved about which cognitive factors exactly predict the intelligibility of speech in noise-vocoded situations in healthy subjects or in patients after cochlear implantation...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28635507/cochlear-implant-effectiveness-in-postlingual-single-sided-deaf-individuals-what-s-the-point
#8
Mareike Finke, Hanna Bönitz, Björn Lyxell, Angelika Illg
OBJECTIVES: By extending the indication criteria for cochlear implants (CI), the population of CI candidates increased in age, as well as range and type of hearing loss. This qualitative study identified factors that contributed to seek CI treatment in single-sided deaf individuals and gained insights how single-sided deafness (SSD) and hearing with a CI affect their lives. DESIGN: An open-ended questionnaire and a standardised inventory (IOI-HA) were used. Qualitative data reflecting the reasons to seek CI treatment and the individual experiences after CI switch-on were collected...
March 5, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28634435/the-clinical-uses-of-electrocochleography
#9
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/28634306/representations-of-time-varying-cochlear-implant-stimulation-in-auditory-cortex-of-awake-marmosets-callithrix-jacchus
#10
Luke A Johnson, Charles C Della Santina, Xiaoqin Wang
Electrical stimulation of the auditory periphery organ by cochlear implant (CI) generates highly synchronized inputs to the auditory system. It has long been thought such inputs would lead to highly synchronized neural firing along the ascending auditory pathway. However, neurophysiological studies with hearing animals have shown that the central auditory system progressively converts temporal representations of time-varying sounds to firing rate-based representations. It is not clear whether this coding principle also applies to highly synchronized CI inputs...
June 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28633960/effect-of-stimulus-level-on-the-temporal-response-properties-of-the-auditory-nerve-in-cochlear-implants
#11
Michelle L Hughes, Sarah A Laurello
Electrically evoked compound action potentials (ECAPs) have been used to examine temporal response patterns of the auditory nerve in cochlear implant (CI) recipients. ECAP responses to individual pulses in a pulse train vary across stimulation rates for individual CI users. For very slow rates, auditory neurons have ample time to discharge, recover, and respond to each pulse in the train. As the pulse rate increases, an alternating ECAP-amplitude pattern occurs. As the stimulation rate increases further, the alternating pattern eventually ceases and the overall ECAP amplitudes are diminished, yielding a relatively stochastic state that presumably reflects a combination of adaptation, desynchronization, and facilitation across fibers...
June 13, 2017: Hearing Research
https://www.readbyqxmd.com/read/28631670/-topographic-anatomy-of-the-hook-region-and-its-significance-for-the-choice-of-the-surgical-technique-for-the-cochlear-implantation
#12
Yu K Yanov, V E Kuzovkov, A S Lilenko, I V Kostevich, S B Sugarova, A Sh Amonov
The mode of the introduction of the active electrode of a cochlear implant into the cochlea remains a key issue as far as cochlear implantation is concerned. Especially much attention has recently been given to the relationship between the anatomical features of the basal region of the cochlea (the so-called 'fish hook') and the possibility to approach it. We have undertaken the attempt to optimize the approach to the tympanic canal (scala tympanica) of the cochlea with a view to reducing to a minimum the risk of an injury to the cochlear structures in the course of cochlear implantation...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/28631161/the-role-of-eabr-with-intracochlear-test-electrode-in-decision-making-between-cochlear-and-brainstem-implants-preliminary-results
#13
Betul Cicek Cinar, Mehmet Yarali, Gamze Atay, Munir Demir Bajin, Gonca Sennaroglu, Levent Sennaroglu
The objective of the study was to discuss the findings of intraoperative electrically evoked auditory brainstem response (eABR) test results with a recently designed intracochlear test electrode (ITE) in terms of their relation to decisions of cochlear or auditory brainstem implantation. This clinical study was conducted in Hacettepe University, Department of Otolaryngology, Head and Neck Surgery and Department of Audiology. Subjects were selected from inner ear malformation (IEM) database. Eleven subjects with profound sensorineural hearing loss were included in the current study with age range from 1 year 3 months to 4 years 3 months for children with prelingual hearing loss...
June 19, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28630884/evaluation-of-a-high-resolution-patient-specific-model-of-the-electrically-stimulated-cochlea
#14
Ahmet Cakir, Robert T Dwyer, Jack H Noble
Cochlear implants (CIs) are surgically implanted medical devices used to treat individuals with severe-to-profound sensorineural hearing loss. Although these devices have been remarkably successful at restoring audibility, many patients experience poor outcomes. Our group has developed the first image-guided CI programming technique where the electrode positions are found in CT images and used to estimate neural activation patterns, which is unique information that audiologists can use to define patient-specific processor settings...
April 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28629258/implementation-and-preliminary-evaluation-of-c-tone-a-novel-algorithm-to-improve-lexical-tone-recognition-in-mandarin-speaking-cochlear-implant-users
#15
Lichuan Ping, Ningyuan Wang, Guofang Tang, Thomas Lu, Li Yin, Wenhe Tu, Qian-Jie Fu
OBJECTIVES: Because of limited spectral resolution, Mandarin-speaking cochlear implant (CI) users have difficulty perceiving fundamental frequency (F0) cues that are important to lexical tone recognition. To improve Mandarin tone recognition in CI users, we implemented and evaluated a novel real-time algorithm (C-tone) to enhance the amplitude contour, which is strongly correlated with the F0 contour. METHODS: The C-tone algorithm was implemented in clinical processors and evaluated in eight users of the Nurotron NSP-60 CI system...
June 20, 2017: Cochlear Implants International
https://www.readbyqxmd.com/read/28628917/anatomical-characteristics-of-facial-nerve-and-cochlea-interaction
#16
Nadine Schart-Morén, Sune Larsson, Helge Rask-Andersen, Hao Li
OBJECTIVE: The aim was to study the relationship between the labyrinthine portion (LP) of the facial canal and the cochlea in human inner ear molds and temporal bones using micro-CT and 3D rendering. A reduced cochlea-facial distance may spread electric currents from the cochlear implant to the LP and cause facial nerve stimulation. Influencing factors may be the topographic anatomy and otic capsule properties. METHODS: An archival collection of human temporal bones underwent micro-CT and 3D reconstruction...
June 20, 2017: Audiology & Neuro-otology
https://www.readbyqxmd.com/read/28625811/intra-operative-radiological-diagnosis-of-a-tip-roll-over-electrode-array-displacement-using-fluoroscopy-when-electrophysiological-testing-is-normal-the-importance-of-both-techniques-in-cochlear-implant-surgery
#17
Octavio Garaycochea, Raquel Manrique-Huarte, Manuel Manrique
No abstract text is available yet for this article.
June 1, 2017: Brazilian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/28625417/modeled-auditory-nerve-responses-to-amplitude-modulated-cochlear-implant-stimulation
#18
M J van Gendt, J J Briaire, R K Kalkman, J H M Frijns
Cochlear implants encode speech information by stimulating the auditory nerve with amplitude-modulated pulse trains. A computer model of the auditory nerve's response to electrical stimulation can be used to evaluate different approaches to improving CI patients' perception. In this paper a computationally efficient stochastic and adaptive auditory nerve model was used to investigate full nerve responses to amplitude-modulated electrical pulse trains. The model was validated for nerve responses to AM pulse trains via comparison with animal data...
May 19, 2017: Hearing Research
https://www.readbyqxmd.com/read/28623039/the-acoustic-characteristics-of-the-voice-in-cochlear-implanted-children-a-longitudinal-study
#19
Yajing Wang, Faya Liang, Jinshan Yang, Xueyuan Zhang, Jiahao Liu, Yiqing Zheng
OBJECTIVE: The purpose of this study was to characterize changes in the voice and vowel articulation of prelingually deaf children after cochlear implantation. METHODS: In this study, the patient group included 30 prelingually deaf children who underwent unilateral cochlear implantation at 4-6 years of age. The control group included normally hearing children of the same age. All deaf children had follow-ups before cochlear implantation and at 1, 3, 6, 12, and 24 months after implantation...
June 13, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28621001/early-vocabulary-development-in-children-with-bilateral-cochlear-implants
#20
Taina Välimaa, Sari Kunnari, Päivi Laukkanen-Nevala, Eila Lonka
BACKGROUND: Children with unilateral cochlear implants (CIs) may have delayed vocabulary development for an extended period after implantation. Bilateral cochlear implantation is reported to be associated with improved sound localization and enhanced speech perception in noise. This study proposed that bilateral implantation might also promote early vocabulary development. Knowledge regarding vocabulary growth and composition in children with bilateral CIs and factors associated with it may lead to improvements in the content of early speech and language intervention and family counselling...
June 16, 2017: International Journal of Language & Communication Disorders
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