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Electroacoustic stimulation

Chin-Tuan Tan
One challenge facing postlingually-deafened cochlear implant (CI) users is the frequency mismatch between the incoming acoustic signal and the characteristic frequency of the electrically stimulated neurons. Current CI is an open-loop system and it requires extensive fine-tuning to help users to adapt to this mismatch over time. Electric-acoustic pitch matching in unilateral cochlear implant (CI) participants who has residual hearing in the non-implanted ear had been shown to serve as a useful metric to monitor adaptation process...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Mika Sato, Peter Baumhoff, Jochen Tillein, Andrej Kral
OBJECTIVE: Electrical stimulation is normally performed on ears that have no hearing function, i.e., lack functional hair cells. The properties of electrically-evoked responses in these cochleae were investigated in several previous studies. Recent clinical developments have introduced cochlear implantation (CI) in residually-hearing ears to improve speech understanding in noise. The present study documents the known physiological differences between electrical stimulation of hair cells and of spiral ganglion cells, respectively, and reviews the mechanisms of combined electric and acoustic stimulation in the hearing ears...
September 2017: Otology & Neurotology
Kyung Jin Roh, Sera Park, Jin Se Jung, In Seok Moon, Sung Huhn Kim, Mi Young Bang, Jae Young Choi
BACKGROUND AND OBJECTIVES: Patients with SCL26A4 mutations presenting with Mondini deformity and enlarged vestibular aqueduct (EVA) tend to have comparable residual hearing. Although cochlear implantation (CI) produces good results in this group, deterioration of residual hearing can be an adverse event after surgery due to accompanying cochlear malformation and perilymph leakage during cochleostomy. The purpose of this study was to investigate if CI in patients with SCL26A4 mutations via the round window (RW) approach could achieve preservation of residual hearing, and to evaluate their speech reception with electroacoustic stimulation (EAS)...
October 2017: Otology & Neurotology
Mun Young Chang, Yoon Chan Rah, Jun Jae Choi, Shin Wook Woo, Yu-Jung Hwang, Hayden Eastwood, Stephen J O'Leary, Jun Ho Lee
HYPOTHESIS: When administered perioperatively, systemic dexamethasone will reduce the hearing loss associated with cochlear implantation (CI) performed via the round window approach. BACKGROUND: The benefits of electroacoustic stimulation have led to interest in pharmacological interventions to preserve hearing after CI. METHODS: Thirty guinea pigs were randomly divided into three experimental groups: a control group; a 3-day infusion group; and a 7-day infusion group...
August 2017: Otology & Neurotology
Chin-Tuan Tan, Brett Martin, Mario A Svirsky
BACKGROUND: Cochlear implants (CIs) successfully restore hearing in postlingually deaf adults, but in doing so impose a frequency-position function in the cochlea that may differ from the physiological one. PURPOSE: The CI-imposed frequency-position function is determined by the frequency allocation table programmed into the listener's speech processor and by the location of the electrode array along the cochlea. To what extent can postlingually deaf CI users successfully adapt to the difference between physiological and CI-imposed frequency-position functions? RESEARCH DESIGN: We attempt to answer the question by combining behavioral measures of electroacoustic pitch matching (PM) and measures of electrode location within the cochlea...
March 2017: Journal of the American Academy of Audiology
Lukasz Olszewski, W Wiktor Jedrzejczak, Anna Piotrowska, Henryk Skarzynski
OBJECTIVES/HYPOTHESIS: The purpose of this study was to measure the degree of coupling between the floating mass transducer (FMT) and the round window membrane (RWM) in patients with conductive and mixed hearing loss implanted with the Vibrant Soundbridge (VSB) device. The efficiency of direct and indirect coupling of the FMT to the RWM was compared by measuring differences between the initial prescription targets and the final settings of the VSB audio processor after fine-tuning. STUDY DESIGN: Retrospective study...
December 2017: Laryngoscope
Jorge de Abajo, Raquel Manrique-Huarte, Ignacio Sanhueza, Laura Alvarez-Gómez, Cristina Zulueta-Santos, Diego Calavia, Fernando Ramírez, Manuel Manrique
OBJECTIVES: The objectives of this study were to evaluate the effect of reimplanting a cochlear implant electrode in animal normal-hearing cochlea to propose measures that may prevent cochlear injury and, given its close phylogenetic proximity to humans, to evaluate the macaque as a model for electroacoustic stimulation. DESIGN: Simultaneous, bilateral surgical procedures in a group of 5 normal-hearing specimens (Macaca fascicularis) took place in a total of 10 ears...
January 2017: Ear and Hearing
Hartmut Meister, Katrin Fuersen, Stefan Schreitmueller, Martin Walger
This study addressed the hypothesis that an improvement in speech recognition due to combined envelope and fine structure cues is greater in the audiovisual than the auditory modality. Normal hearing listeners were presented with envelope vocoded speech in combination with low-pass filtered speech. The benefit of adding acoustic low-frequency fine structure to acoustic envelope cues was significantly greater for audiovisual than for auditory-only speech. It is suggested that this is due to complementary information of the different acoustic and visual cues...
June 2016: Journal of the Acoustical Society of America
Mika Sato, Peter Baumhoff, Andrej Kral
UNLABELLED: Electroacoustic stimulation in subjects with residual hearing is becoming more widely used in clinical practice. However, little is known about the properties of electrically induced responses in the hearing cochlea. In the present study, normal-hearing guinea pig cochleae underwent cochlear implantation through a cochleostomy without significant loss of hearing. Using recordings of unit activity in the midbrain, we were able to investigate the excitation patterns throughout the tonotopic field determined by acoustic stimulation...
January 6, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
Joseph P Roche, Marlan R Hansen
Cochlear implantation and cochlear implants (CIs) have a long history filled with innovations that have resulted in the high-performing device's currently available. Several promising technologies have been reviewed in this article, which hold the promise to drive performance even higher. Remote CI programming, totally implanted devices, improved neural health and survival through targeted drug therapy and delivery, intraneural electrode placement, electroacoustical stimulation and hybrid CIs, and methods to enhance the neural-prosthesis interface are evolving areas of innovation reviewed in this article...
December 2015: Otolaryngologic Clinics of North America
Nathaniel T Greene, Jameson K Mattingly, Herman A Jenkins, Daniel J Tollin, James R Easter, Stephen P Cass
HYPOTHESIS: Cochlear implants (CIs) designed for hearing preservation will not alter mechanical properties of the middle and inner ears as measured by intracochlear pressure (P(IC)) and stapes velocity (Vstap). BACKGROUND: CIs designed to provide combined electroacoustic stimulation are now available. To maintain functional acoustic hearing, it is important to know if a CI electrode can alter middle or inner ear mechanics because any alteration could contribute to elevated low-frequency thresholds in electroacoustic stimulation patients...
September 2015: Otology & Neurotology
G A Tavartkiladze
This paper reports the literature data summarizing the recent achievements in the field of rehabilitation of the patients suffering from deafness and serious impairment of hearing with the use of cochlear implantation. Much attention is given to the limitations of the modern strategies of signal processing and the prospects for the further development of scientific research in this area. Special emphasis is laid on recent progress in audiology including the binaural cochlear implant technology and the electroacoustic stimulation facilitating significant improvement in the outcomes of rehabilitation of the patients...
2015: Vestnik Otorinolaringologii
Alexandre Caixeta Guimarães, Guilherme Machado de Carvalho, Alexandre S M Duarte, Walter A Bianchini, Andrea Bravo Sarasty, Maria Fernanda di Gregorio, Mario Emilio Zernotti, Edi Lúcia Sartorato, Arthur Menino Castilho
INTRODUCTION: Electroacoustic stimulation is an excellent option for people with residual hearing in the low frequencies, who obtain insufficient benefit with hearing aids. To be effective, the subject's residual hearing should be preserved during cochlear implant surgery. OBJECTIVES: To evaluate the hearing preservation in patients that underwent implant placement and to compare the results in accordance with the approach to the inner ear. METHODS: 19 subjects underwent a soft surgical technique, and the electrode MED-EL FLEX™ EAS, designed to be atraumatic, was used...
March 2015: Brazilian Journal of Otorhinolaryngology
S Irving, L Gillespie, R Richardson, D Rowe, J B Fallon, A K Wise
Cochlear implants have provided hearing to hundreds of thousands of profoundly deaf people around the world. Recently, the eligibility criteria for cochlear implantation have been relaxed to include individuals who have some useful residual hearing. These recipients receive inputs from both electric and acoustic stimulation (EAS). Implant recipients who can combine these hearing modalities demonstrate pronounced benefit in speech perception, listening in background noise, and music appreciation over implant recipients that rely on electrical stimulation alone...
2014: BioMed Research International
Sebastian P Schraven, Robert Mlynski, Ernst Dalhoff, Daniela Wildenstein, Balint Alkonyi, Anthony W Gummer, Rudolf Hagen
HYPOTHESIS: In situ evaluation of the vibration performance of a hybrid system for intracochlear fluid stimulation, constructed from a floating mass transducer (FMT) coupled to an electric acoustic stimulation (EAS) cochlea implant (CI) electrode. BACKGROUND: EAS uses both CI technology to restore severe-to-profound hearing loss at high frequencies and acoustic amplification for mild-to-moderate hearing loss in the low-to-mid frequency range. More patients with residual hearing are becoming candidates for EAS surgery because of the improved techniques for hearing preservation...
January 2015: Otology & Neurotology
Ahmad F Mahmoud, Sean T Massa, Stacy L Douberly, Michelle L Montes, Michael J Ruckenstein
OBJECTIVE: To determine the safety, efficacy, and potential for hearing preservation of an electroacoustic hearing system in patients with severe high-frequency and moderate low-frequency hearing loss. PATIENTS: Five patients were included in this study with steeply down-sloping sensorineural hearing loss. All patients had a history of hearing aid use and similar hearing in the contralateral ear. Ages ranged from 48 to 69 years. INTERVENTION: All participants were implanted with an electro-acoustic stimulation (EAS) device using a hearing preservation technique...
September 2014: Otology & Neurotology
V I Fedoseev, N S Dmitriev
The objective of the present study was to estimate and analyse the effectiveness and labour intensity of the methods of surgical intervention for cochlear implantation. The analysis of the surgical stage of cochlear implantation was based on the examination of 2073 children and adults during the period from 1991 to 2013. The age of the patients varied between 6 months to 71 years. The cause of deafness was meningitis and an injury in 11% and 6% of the patients respectively. The cochlear implants from Advanced Bionics were inserted in 495 patients, those from Med-El in 9 ones , and from Neurelec in 20, and Nucleus devices from Cochlear in the remaining patents (n=1549) including 37 double-array electrodes and a Hybrid implant for electroacoustic correction of hearing ...
2014: Vestnik Otorinolaringologii
Erin C Schafer, Denise Romine, Elizabeth Musgrave, Sadaf Momin, Christy Huynh
BACKGROUND: Previous research has suggested that electrically coupled frequency modulation (FM) systems substantially improved speech-recognition performance in noise in individuals with cochlear implants (CIs). However, there is limited evidence to support the use of electromagnetically coupled (neck loop) FM receivers with contemporary CI sound processors containing telecoils. PURPOSE: The primary goal of this study was to compare speech-recognition performance in noise and subjective ratings of adolescents and adults using one of three contemporary CI sound processors coupled to electromagnetically and electrically coupled FM receivers from Oticon...
November 2013: Journal of the American Academy of Audiology
Rolien H Free, Maurizio Falcioni, Giuseppe Di Trapani, Anna Lisa Giannuzzi, Alessandra Russo, Mario Sanna
OBJECTIVE: To report and review 32 cases of subtotal petrosectomy (SP) in cochlear implant (CI) surgery and to define the indications and contraindications for this procedure. STUDY DESIGN: Retrospective case review + case reports. SETTING: Tertiary skull base center. PATIENTS: Cochlear implant database: 32 subtotal petrosectomies in 31 patients. INTERVENTIONS: Subtotal petrosectomy with blind sac closure of the external auditory canal, closure of Eustachian tube, and abdominal fat obliteration in combination with cochlear implantation...
August 2013: Otology & Neurotology
Luciana P Garolla, Susan D Scollie, Maria Cecília Martinelli Iório
OBJECTIVE: Recommended practice is to verify the gain and/or output of hearing aids with speech or speech-shaped signals. This study has the purpose of developing a speech test signal in Brazilian Portuguese that is electroacoustically similar to the international long-term average speech spectrum (ILTASS) for use in real ear verification systems. DESIGN: A Brazilian Portuguese speech passage was recorded using standardized equipment and procedures for one female talker and compared to ISTS...
August 2013: International Journal of Audiology
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