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Auditory Brainstem Implant

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https://www.readbyqxmd.com/read/28210535/magnetic-resonance-imaging-in-a-neurofibromatosis-type-2-patient-with-a-novel-mri-compatible-auditory-brainstem-implant
#1
REVIEW
Matthew Shew, Judson Bertsch, Paul Camarata, Hinrich Staecker
Auditory brainstem implantation has become a key technique for the rehabilitation of hearing in patients with neurofibromatosis type 2. The nature of this devastating genetic disease requires ongoing MRI for the patient's lifespan. Today, most auditory brainstem implants require removal of the magnet that connects the internal device to the external speech processor to undergo imaging as their disease progresses. Patients have the option of having a short procedure to have the magnet taken out and replaced each time, or alternately using a headband to secure the processor over the receiver coil of the internal device...
January 2017: Journal of Neurological Surgery Reports
https://www.readbyqxmd.com/read/28209771/hearing-loss-in-children-with-asymptomatic-congenital-cytomegalovirus-infection
#2
Tatiana M Lanzieri, Winnie Chung, Marily Flores, Peggy Blum, A Chantal Caviness, Stephanie R Bialek, Scott D Grosse, Jerry A Miller, Gail Demmler-Harrison
OBJECTIVES: To assess the prevalence, characteristics, and risk of sensorineural hearing loss (SNHL) in children with congenital cytomegalovirus infection identified through hospital-based newborn screening who were asymptomatic at birth compared with uninfected children. METHODS: We included 92 case-patients and 51 controls assessed by using auditory brainstem response and behavioral audiometry. We used Kaplan-Meier survival analysis to estimate the prevalence of SNHL, defined as ≥25 dB hearing level at any frequency and Cox proportional hazards regression analyses to compare SNHL risk between groups...
February 16, 2017: Pediatrics
https://www.readbyqxmd.com/read/28185669/electrical-stimulation-and-monitoring-devices-of-the-cns-an-imaging-review
#3
REVIEW
Sohil H Patel, Casey H Halpern, Timothy M Shepherd, Vincent M Timpone
Functional neurosurgery is a rapidly growing field with exciting future potential applications. This article describes currently used implanted electronic devices for neurologic stimulation and monitoring. The devices to be reviewed include invasive EEG electrodes, deep brain stimulator, motor cortex stimulator, responsive neurostimulation, osteo-integrated hearing aid, middle ear implant, cochlear implant, auditory brainstem implant, vagal nerve stimulator and spinal cord stimulator. Emphasis is placed on the normal components, function, positioning, potential complications and MRI safety of these devices...
February 6, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/28174524/ups-and-downs-in-75-years-of-electrocochleography
#4
REVIEW
Jos J Eggermont
Before 1964, electrocochleography (ECochG) was a surgical procedure carried out in the operating theatre. Currently, the newest application is also an intra-operative one, often carried out in conjunction with cochlear implant surgery. Starting in 1967, the recording methods became either minimal- or not-invasive, i.e., trans-tympanic (TT) or extra tympanic (ET), and included extensive studies of the arguments pro and con. I will review several valuable applications of ECochG, from a historical point of view, but covering all 75 years if applicable...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28159538/the-effect-of-systemic-lipoic-acid-on-hearing-preservation-after-cochlear-implantation-via-the-round-window-approach-a-guinea-pig-model
#5
Mun Young Chang, Tae Mok Gwon, Ho Sun Lee, Jun Ho Lee, Seung Ha Oh, Sung June Kim, Min-Hyun Park
The present study aimed to evaluate the effects of systemic lipoic acid on hearing preservation after cochlear implantation. Twelve Dunkin-Hartley guinea pigs were randomly divided into two groups: the control group and the lipoic acid group. Animals in the lipoic acid group received lipoic acid intraperitoneally for 4 weeks. A sterilised silicone electrode-dummy was inserted through the round window to a depth of approximately 5 mm. The hearing level was measured using auditory brainstem responses (ABRs) prior to electrode-dummy insertion, and at 4 days and 1, 2, 3 and 4 weeks after electrode-dummy insertion...
January 31, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28130910/auditory-and-audio-visual-processing-in-patients-with-cochlear-auditory-brainstem-and-auditory-midbrain-implants-an-eeg-study
#6
Irina Schierholz, Mareike Finke, Andrej Kral, Andreas Büchner, Stefan Rach, Thomas Lenarz, Reinhard Dengler, Pascale Sandmann
There is substantial variability in speech recognition ability across patients with cochlear implants (CIs), auditory brainstem implants (ABIs), and auditory midbrain implants (AMIs). To better understand how this variability is related to central processing differences, the current electroencephalography (EEG) study compared hearing abilities and auditory-cortex activation in patients with electrical stimulation at different sites of the auditory pathway. Three different groups of patients with auditory implants (Hannover Medical School; ABI: n = 6, CI: n = 6; AMI: n = 2) performed a speeded response task and a speech recognition test with auditory, visual, and audio-visual stimuli...
January 28, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28124637/the-effect-of-local-application-of-insulin-like-growth-factor-for-prevention-of-inner-ear-damage-caused-by-electrode-trauma
#7
H Gur, Y Alimoglu, U Duzenli, S Korkmaz, S Inan, L Olgun
BACKGROUND: Electrode insertion during cochlear implantation causes cochlear damage and apoptosis. Insulin-like growth factor applied locally was investigated in 21 rats. METHODS: In the sham group, an intracochlear dummy electrode was inserted through the round window. In the control group, after the same insertion procedure, saline-soaked porcine skin gelatine was placed on the round window. In the study group, insulin-like growth factor 1 soaked gelatine was placed on the round window...
January 26, 2017: Journal of Laryngology and Otology
https://www.readbyqxmd.com/read/28123078/cortical-representation-of-interaural-time-difference-is-impaired-by-deafness-in-development-evidence-from-children-with-early-long-term-access-to-sound-through-bilateral-cochlear-implants-provided-simultaneously
#8
Vijayalakshmi Easwar, Hiroshi Yamazaki, Michael Deighton, Blake Papsin, Karen Gordon
: Accurate use of interaural time differences (ITDs) for spatial hearing may require access to bilateral auditory input during sensitive periods in human development. Providing bilateral cochlear implants (CIs) simultaneously promotes symmetrical development of bilateral auditory pathways but does not support normal ITD sensitivity. Thus, although binaural interactions are established by bilateral CIs in the auditory brainstem, potential deficits in cortical processing of ITDs remain...
January 25, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28121970/resorbable-mesh-cranioplasty-repair-of-bilateral-cerebrospinal-fluid-leaks-following-pediatric-simultaneous-bilateral-auditory-brainstem-implant-surgery
#9
Giacomo Colletti, Marco Mandalà, Vittorio Colletti, Alberto Deganello, Fabiana Allevi, Liliana Colletti
OBJECTIVE: To present a child with cochlear nerve deficiency (CND) who received simultaneous bilateral simultaneous auditory brainstem implants (BS-ABI) and subsequently presented with bilateral cerebrospinal fluid (CSF) leaks unresponsive to standard treatments. To propose a novel rigid retrosigmoid cranioplasty for treating and preventing CSF leaks in children at high risk for this complication. PATIENT: A 3.5-year-old child with CND, vertebral defects, anal atresia, cardiac defects, tracheo-esophageal fistula, renal anomalies, and limb abnormalities, coloboma, heart defect, atresia choanae, retarded growth and development, genital abnormality, and ear abnormality, Arnold Chiari malformation, previous treated tracheo-esophageal fistula underwent BS-ABI...
January 24, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28098509/-compassionate-use-protocol-for-auditory-brainstem-implantation-in-neurofibromatosis-type-2-early-house-ear-institute-experience
#10
Daniel S Roberts, William H Slattery, Brian S Chen, Steve R Otto, Marc S Schwartz, Gregory P Lekovic
OBJECTIVE: To report the preliminary outcomes of auditory brainstem implantation (ABI) under a compassionate use protocol for two ABI devices that are not approved by the US Food and Drug Administration. METHODS: A retrospective review was performed of neurofibromatosis type 2 (NF2) patients who underwent microsurgery for vestibular schwannoma (VS) and placement of either the Cochlear ABI541 or Med-El Synchrony ABIs. Peri-operative and device- related complications were reviewed...
January 18, 2017: Cochlear Implants International
https://www.readbyqxmd.com/read/28087418/degeneration-of-auditory-nerve-fibers-in-guinea-pigs-with-severe-sensorineural-hearing-loss
#11
Steven Kroon, Dyan Ramekers, Emma M Smeets, Ferry G J Hendriksen, Sjaak F L Klis, Huib Versnel
Damage to and loss of the organ of Corti leads to secondary degeneration of the spiral ganglion cell (SGC) somata of the auditory nerve. Extensively examined in animal models, this degeneration process of SGC somata following deafening is well known. However, degeneration of auditory nerve axons, which conduct auditory information towards the brainstem, and its relation to SGC soma degeneration are largely unknown. The consequences of degeneration of the axons are relevant for cochlear implantation, which is applied to a deafened system but depends on the condition of the auditory nerve...
January 10, 2017: Hearing Research
https://www.readbyqxmd.com/read/27987044/short-wavelength-infrared-laser-activates-the-auditory-neurons-comparing-the-effect-of-980-vs-810%C3%A2-nm-wavelength
#12
Lan Tian, Jingxuan Wang, Ying Wei, Jianren Lu, Anting Xu, Ming Xia
Research on auditory neural triggering by optical stimulus has been developed as an emerging technique to elicit the auditory neural response, which may provide an alternative method to the cochlear implants. However, most previous studies have been focused on using longer-wavelength near-infrared (>1800 nm) laser. The effect comparison of different laser wavelengths in short-wavelength infrared (SWIR) range on the auditory neural stimulation has not been previously explored. In this study, the pulsed 980- and 810-nm SWIR lasers were applied as optical stimuli to irradiate the auditory neurons in the cochlea of five deafened guinea pigs and the neural response under the two laser wavelengths was compared by recording the evoked optical auditory brainstem responses (OABRs)...
February 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/27898605/initial-results-of-a-safety-and-feasibility-study-of-auditory-brainstem-implantation-in-congenitally-deaf-children
#13
Eric P Wilkinson, Laurie S Eisenberg, Mark D Krieger, Marc S Schwartz, Margaret Winter, Jamie L Glater, Amy S Martinez, Laurel M Fisher, Robert V Shannon
OBJECTIVE: To determine the safety and feasibility of the auditory brainstem implant (ABI) in congenitally deaf children with cochlear aplasia and/or cochlear nerve deficiency. STUDY DESIGN: Phase I feasibility clinical trial of surgery in 10 children, ages 2 to 5 years, over a 3-year period. SETTING: Tertiary children's hospital and university-based pediatric speech/language/hearing center. INTERVENTION(S): ABI implantation and postsurgical programming...
February 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/27862478/reductions-in-cortical-alpha-activity-enhancements-in-neural-responses-and-impaired-gap-detection-caused-by-sodium-salicylate-in-awake-guinea-pigs
#14
Joel I Berger, Ben Coomber, Mark N Wallace, Alan R Palmer
Tinnitus chronically affects between 10-15% of the population but, despite its prevalence, the underlying mechanisms are still not properly understood. One experimental model involves administration of high doses of sodium salicylate, as this is known to reliably induce tinnitus in both humans and animals. Guinea pigs were implanted with chronic electrocorticography (ECoG) electrode arrays, with silver-ball electrodes placed on the dura over left and right auditory cortex. Two more electrodes were positioned over the cerebellum to monitor auditory brainstem responses (ABRs)...
November 12, 2016: European Journal of Neuroscience
https://www.readbyqxmd.com/read/27831887/modeling-intracochlear-magnetic-stimulation-a-finite-element-analysis
#15
Sagarika Mukesh, D T Blake, B J McKinnon, P T Bhatti
This study models induced electric fields, and their gradient, produced by pulsatile current stimulation of submillimeter inductors for cochlear implantation. Using finite-element analysis, the lower chamber of the cochlea, scala tympani, is modeled as a cylindrical structure filled with perilymph bounded by tissue, bone, and cochlear neural elements. Single inductors as well as an array of inductors are modeled. The coil strength (~100 nH) and excitation parameters (Peak current of 1 - 5 A, Voltages of 16 - 20 V) are based on a formative feasibility study conducted by our group...
November 2, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/27816614/developmental-exposure-to-an-environmental-pcb-mixture-delays-the-propagation-of-electrical-kindling-from-the-amygdala
#16
Suren B Bandara, Renee N Sadowski, Susan L Schantz, Mary E Gilbert
Developmental PCB exposure impairs hearing and induces brainstem audiogenic seizures in adult offspring. The degree to which this enhanced susceptibility to seizure is manifest in other brain regions has not been examined. Thus, electrical kindling of the amygdala was used to evaluate the effect of developmental exposure to an environmentally relevant PCB mixture on seizure susceptibility in the rat. Female Long-Evans rats were dosed orally with 0 or 6mg/kg/day of the PCB mixture dissolved in corn oil vehicle 4 weeks prior to mating and continued through gestation and up until postnatal day (PND) 21...
January 2017: Neurotoxicology
https://www.readbyqxmd.com/read/27755361/tinnitus-suppression-after-auditory-brainstem-implantation-in-patients-with-neurofibromatosis-type-2
#17
Daniel S Roberts, Steve Otto, Brian Chen, Kevin A Peng, Marc S Schwartz, Derald E Brackmann, John W House
OBJECTIVE: To evaluate whether an auditory brainstem implant (ABI) can impact levels of tinnitus in neurofibromatosis type-2 (NF2) patients who have undergone translabyrinthine craniotomy for vestibular schwannoma (VS) removal and to evaluate the burden of tinnitus in these patients. STUDY DESIGN: A retrospective case series and patient survey. SETTING: Tertiary neurotologic referral center. PATIENTS: NF2 patients who underwent translabyrinthine removal of VS and ABI placement between 1994 and 2015...
January 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/27733103/acceleration-of-healing-of-traumatic-tympanic-membrane-perforation-in-rats-by-implanted-collagen-membrane-integrated-with-collagen-binding-basic-fibroblast-growth-factor
#18
Dan Zhang, Zhen Huang, Peng Sun, Haiping Huang, Yunmei Zhang, Jianwu Dai, Jisheng Liu, Qin Shi
Traumatic tympanic membrane (TM) perforation is very common in clinical practice. Several biomaterials have been reported to play a role in TM reparation, whereas their functional recovery is limited when used alone. Meanwhile, the administration of biofactors could promote functional recovery, but rapid distribution and short half-time obstruct their application. To study the effect of traumatic TM regeneration, we prepared collagen membrane (CM) integrated with collagen-binding basic fibroblast growth factor (CBD-bFGF) and implanted into the injury site of perforated TM in Sprague-Dawley rats...
January 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/27716925/auditory-brainstem-implant-program-development
#19
Marc S Schwartz, Eric P Wilkinson
OBJECTIVE: Auditory brainstem implants (ABIs), which have previously been used to restore auditory perception to deaf patients with neurofibromatosis type 2 (NF2), are now being utilized in other situations, including treatment of congenitally deaf children with cochlear malformations or cochlear nerve deficiencies. Concurrent with this expansion of indications, the number of centers placing and expressing interest in placing ABIs has proliferated. Because ABI placement involves posterior fossa craniotomy in order to access the site of implantation on the cochlear nucleus complex of the brainstem and is not without significant risk, we aim to highlight issues important in developing and maintaining successful ABI programs that would be in the best interests of patients...
September 26, 2016: Laryngoscope
https://www.readbyqxmd.com/read/27714498/effect-of-a-liposomal-hyaluronic-acid-gel-loaded-with-dexamethasone-in-a-guinea-pig-model-after-manual-or-motorized-cochlear-implantation
#20
Elisabeth Mamelle, Naila El Kechai, Benjamin Granger, Olivier Sterkers, Amélie Bochot, Florence Agnely, Evelyne Ferrary, Yann Nguyen
Goals of cochlear implantation have shifted from complete insertion of the cochlear electrode array towards low traumatic insertion with minimally invasive techniques. The aim of this study was first to evaluate, in a guinea pig model of cochlear implantation, the effect of a motorized insertion technique on hearing preservation. The second goal was to study a new gel formulation containing dexamethasone phosphate loaded in liposomes (DEX-P). Guinea pigs had a unilateral cochlear implantation with either a manual technique (n = 12), or a motorized technique (n = 15), with a 0...
February 2017: European Archives of Oto-rhino-laryngology
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