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auditory brainstem implants

Matthew Shew, Helena Wichova, James Lin, Luke N Ledbetter, Hinrich Staecker
OBJECTIVE: Our objective is to evaluate the safety in patients with cochlear implants (CIs) and auditory brainstem implants (ABI) undergoing 1.5 Tesla (T) magnetic resonance imaging (MRI). Secondly, we want to raise awareness on CI and MRI safety, and advocate for continued improvement and advancement to minimize morbidity for our CI patients. METHODS: Retrospective case series from 2006 to 2018 at a single tertiary academic center. Data was collected on patients with CI or auditory brainstem implants undergoing MRI...
November 9, 2018: Laryngoscope
Makoto Hosoya, Shujiro B Minami, Chieko Enomoto, Tatsuo Matsunaga, Kimitaka Kaga
Objectives: We sought to determine how the pathology altered electrically evoked auditory brainstem responses (EABRs) in patients with hearing loss by evaluating EABRs in auditory neuropathy patients with OTOF mutations comparing with various types of congenital deafness. Methods: We included 15 patients with congenital hearing loss, grouped according to pathology: OTOF mutations (n = 4), GJB2 mutations (n = 4), SLC26A4 mutations (n = 4), or cytomegalovirus infections (n = 3)...
October 2018: Laryngoscope Investigative Otolaryngology
Charis Khoo, A H NurHafiizhoh, Angela Tan, Tracy Tan, Hwan Ing Hee
BACKGROUND: The Auditory brainstem implant (ABI) is a new surgical option for hearing impaired children. Intraoperative neurophysiology monitoring includes brainstem mapping of cranial nerve (CN) IX, X, XI, XII and their motor nuclei, and corticobulbar tract motor-evoked potential. These require laryngeal electrodes and intra-oral pins, posing a challenge to airway management especially in the pediatric airway, where specialized electromyogram (EMG) tracheal tubes are not available. Challenges include determining the optimum position on the endotracheal tube (ETT) in which to place laryngeal electrode, and the increase in external diameter of ETT contributed by the wrapping the electrode around the shaft of ETT; this may necessitate downsizing of the tracheal tube...
November 7, 2018: BMC Anesthesiology
Yingyue Xu, Nan Xia, Michelle Lim, Xiaodong Tan, Minh Ha Tran, Erin Boulger, Fei Peng, Hunter Young, Christoph Rau, Alexander Rack, Claus-Peter Richter
An emerging method in the field of neural stimulation is the use of photons to activate neurons. The possible advantage of optical stimulation over electrical is attributable to its spatially selective activation of small neuron populations, which is promising in generating superior spatial resolution in neural interfaces. Two principal methods are explored for cochlear prostheses: direct stimulation of nerves with infrared light and optogenetics. This paper discusses basic requirements for developing a light delivery system (LDS) for the cochlea and provides examples for building such devices...
October 2018: Neurophotonics
Daniel Keppeler, Ricardo Martins Merino, David Lopez de la Morena, Burak Bali, Antoine Tarquin Huet, Anna Gehrt, Christian Wrobel, Swati Subramanian, Tobias Dombrowski, Fred Wolf, Vladan Rankovic, Andreas Neef, Tobias Moser
Optogenetic tools, providing non-invasive control over selected cells, have the potential to revolutionize sensory prostheses for humans. Optogenetic stimulation of spiral ganglion neurons (SGNs) in the ear provides a future alternative to electrical stimulation used in cochlear implants. However, most channelrhodopsins do not support the high temporal fidelity pertinent to auditory coding because they require milliseconds to close after light-off. Here, we biophysically characterized the fast channelrhodopsin Chronos and revealed a deactivation time constant of less than a millisecond at body temperature...
November 5, 2018: EMBO Journal
David R Friedmann, Leena Asfour, William H Shapiro, J Thomas Roland, Susan B Waltzman
OBJECTIVE: To assess bimodal auditory performance in children with a cochlear implant (CI) and contralateral auditory brainstem implant (ABI). METHODS: This is a retrospective case review performed at a tertiary referral center. Four patients with cochlear nerve deficiency initially underwent cochlear implantation but were not benefiting from their devices and underwent ABI in the contralateral ear. The main outcome measures included age-appropriate speech perception and production assessments...
November 2, 2018: Audiology & Neuro-otology
I P Tang, B H Kevin Ng, N Prepageran, S L Donald Ngian, H W Albert Sii
Auditory brainstem implantation (ABI) is the only solution to restore hearing when cochlear nerves are disrupted together with the pathologies where bilateral cochleae do not provide a suitable location for cochlear implantation. We reported first two successful auditory brainstem implantation cases in patients with neurofibromatosis Type II (NF2) with bilateral acoustic neuroma causing bilateral profound sensorineural hearing loss in Malaysia. A good candidate selection, dedicated surgeons and rehabilitation team as well as strong family support are the crucial factors in achieving the best possible surgical, audiological and speech outcomes...
October 2018: Medical Journal of Malaysia
S Nospes, M A Brockmann, A Läßig
BACKGROUND: More than 100,000 patients with cochlear implants live in Germany. In addition, numerous patients have auditory bone conducted, middle-ear conducted or brainstem conducted implants equipped with implanted magnets. At the same time, the number of patients being examined by magnetic resonance imaging (MRI) is increasing. Therefore, MRI compatibility of these implants is an essential quality feature. METHODS: This article provides information about technical innovations and new auditory devices since November 2013 that have medical-technical certification in the European Union and the USA...
October 22, 2018: Der Radiologe
Noelia Muñoz Fernández, Carlos de Paula Vernetta, Laura Cavallé Garrido, Miguel Díaz Gómez, Constantino Morera Pérez
OBJECTIVES: Auditory brainstem potentials can be elicited by electrical stimulation of the round window (RW). In this technique, extracochlear stimulation is objectively used in the selection of cochlear implant (CI) candidates to avoid cochlear damage. However, until now, its use is limited due to the large artifacts generated by electrical stimulation. Our objective was to obtain reliable and reproducible electrically evoked auditory brainstem responses (eEABRs) using a new method of stimulation...
October 13, 2018: Journal of International Advanced Otology
S Raghunandhan, K Madhav, A Senthilvadivu, K Natarajan, M Kameswaran
INTRODUCTION: Paediatric Auditory Brainstem Implantation (ABI) is indicated for children with congenital cochlear aplasia, absent/hypoplastic vestibulocochlear nerve, for whom cochlear implantation is not possible. Knowledge of the anatomical landmarks and variants in anatomy of the brainstem is vital for ABI surgery. METHOD: Study was done at Auditory implant centre in Madras ENT research foundation, which includes 24 children who had undergone ABI surgery and are being followed up for 1 year, post operatively...
October 4, 2018: European Annals of Otorhinolaryngology, Head and Neck Diseases
M Polak, L Colletti, V Colletti
OBJECTIVES: To develop a reliable and objective fitting method for use with young children with an auditory brainstem implant (ABI). MATERIALS AND METHODS: Subjects were 17 young children implanted with an ABI with the mean age 2 years and 4 months (8-64 months). Evoked auditory brainstem response (eABR) measurements were performed intraoperatively and at activation in order to record the auditory response and non-auditory side effects. Each child was tested to observe any subjective responses to the electric stimuli and non-auditory side effects...
October 3, 2018: European Annals of Otorhinolaryngology, Head and Neck Diseases
John Ka Keung Sung, Betty Pui Ki Luk, Terence Ka Cheong Wong, Jiun Fong Thong, Hoi Tung Wong, Michael Chi Fai Tong
OBJECTIVE: This is a retrospective review of the impact of an Auditory Brainstem Implant (ABI) on the audiological rehabilitation and tonal language development of pediatric patients with prelingual profound deafness in Hong Kong. RESULTS: From January 2009 to February 2015, 11 pediatric patients with profound prelingual deafness received an ABI in Hong Kong (age range 1.67-3.75 years). Etiologies included Cochlear Nerve Deficiency in 7, Severe Cochlear Malformations in 2, and Retrocochlear Deafness in 2...
2018: Audiology & Neuro-otology
Yadollah Zahed Pasha, Mohammad Zamani, Ali Hashemi Fard, Ermia Zahed Pasha
BACKGROUND: The purpose of this study was to investigate the results of hearing screening in all newborn infants, and their follow-up in Babol, northern Iran. METHODS: Between 2006 and 2014, all healthy neonates delivered in 3 hospitals were included in this cross-sectional study. Newborns were screened using the transient evoked otoacoustic emissions test before discharge. Those who failed to pass the examination were tested for auditory brainstem response (ABR) by the age of one month...
September 1, 2018: Archives of Iranian Medicine
Hanne Deprez, Robin Gransier, Michael Hofmann, Jan Wouters, Nicolas Verhaert
Acoustic hearing implants, such as direct acoustic cochlear implants (DACIs), can be used to treat profound mixed hearing loss. Electrophysiological responses in DACI subjects are of interest to confirm auditory processing intra-operatively, and to assist DACI fitting postoperatively. We present two related studies, focusing on DACI artifacts and electrophysiological measurements in DACI subjects, respectively. In the first study we aimed to characterize DACI artifacts, to study the feasibility of measuring frequency-specific electrophysiological responses in DACI subjects...
August 28, 2018: Hearing Research
Leena Asfour, David R Friedmann, William H Shapiro, J Thomas Roland, Susan B Waltzman
OBJECTIVE: To assess auditory brainstem implant (ABI) outcomes in children with a prospective study. METHODS: Twelve patients with cochlear nerve deficiency received an auditory brainstem implant. Patients were evaluated with age appropriate speech perception and production assessments, and health related quality of life (HRQoL) surveys for parents of subjects and for subjects if age appropriate. RESULTS: Twelve patients received an ABI without major complications...
October 2018: International Journal of Pediatric Otorhinolaryngology
Daniele Marchioni, Sheila Veronese, Marco Carner, Andrea Sacchetto, Luca Sacchetto, Barbara Masotto, Luca Bianconi
OBJECTIVE: Hearing restoration has always been a dream in vestibular schwannoma (VS) surgery. The aim of this study is to describe an endoscopic assisted transcanal retrocochlear approach to the internal auditory canal (IAC) with total removal of the VS; simultaneously we assessed the anatomical and functional aspects of hearing restoration with cochlear implant (CI). STUDY DESIGN: A retrospective case series. SETTING: Tertiary referral center...
August 30, 2018: Otology & Neurotology
Scott Chambers, Carrie Newbold, Dimitra Stathopoulos, Karina Needham, Chris Miller, Frank Risi, Ya Lang Enke, Godofredo Timbol, Robert Cowan
OBJECTIVE: To compare the benefits of a dexamethasone-eluting array for hearing preservation and cochlear histopathology in low trauma (soft-surgery) and high trauma models of cochlear implant surgery. METHODS: Adult guinea pigs were implanted with an intra-cochlear array using two different surgical procedures: either a soft-surgery approach or following generation of electrode insertion trauma (high trauma). Two methods of dexamethasone delivery were evaluated: elution from an electrode array alone, and elution from a cochlear implant electrode array in combination with a pre-operative systemic injection...
August 20, 2018: Cochlear Implants International
T I Chugunova, V V Zherenkova, M V Goyhburg, L A Potalova, V V Mosin, V V Bakhshinyan, G A Tavartkiladze
The objective methods for the hearing examination of the patients after cochlear implantation provide an important tool for the speech processor fitting. The aim of the present study was to evaluate the possibilities and the informative value of the electrically evoked compound action potential (ECAP) and electrically evoked auditory brainstem response (EABR) combined recording technique. For this reason, the comparison of the ECAP and EABR thresholds with comfortable levels of stimulation, obtained on the basis of subjective response and psychophysical testing of the patients with good results after cochlear implantation was performed...
2018: Vestnik Otorinolaringologii
M R Lalayants, N B Brazhkina, E N Geptner, A V Kruglov, V V Barrlyak, G A Tavartkiladze
The objective of the present study was to estimate peculiarities of the auditory brainstem evoked potentials (ABR), auditory steady-state responses (ASSR) and cortical auditory evoked potentials (CAEP) in the children presenting with bilateral auditory neuropathy spectrum disorder (ANSD). The study included 100 patients with bilateral ANSD diagnosed based on the positive response of otoacoustic emissions (OAEs) and/or cochlear microphonic (CM) detection, while no synchronous neural activity was detected in the ABR test...
2018: Vestnik Otorinolaringologii
Serpil Ece Aras Öztürk, Selma Aktaş, Leman Tuba Karakurt, Ömer Necati Develioğlu, Zehra Murat, Fatma Çetinkaya, Seda Geylani Güleç
Aim: This study aimed to present the results of newborns who were referred to advanced audiology centers after newborn hearing screening, and to determine concordance of our results with the American Academy of Pediatrics guidelines about the ages of hearing loss, aid fitting, and cochlear implantation. Materials and Methods: A total of 7502 newborns were screened in Gaziosmanpaşa Taksim Research and Training Hospital between March 2014 and June 2016 using the transient otoacustic emissions test as the first two steps and automated auditory brainstem response test for the third step...
March 2018: Türk Pediatri Arşivi
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