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https://www.readbyqxmd.com/read/29135872/the-role-of-auditory-evoked-potentials-in-the-context-of-cochlear-implant-provision
#1
Sebastian Hoth, Oliver Christian Dziemba
: Auditory evoked potentials (AEP) are highly demanded during the whole process of equipping patients with cochlear implants (CI). They play an essential role in preoperative diagnostics, intraoperative testing, and postoperative monitoring of auditory performance and success. The versatility of AEP's is essentially enhanced by their property to be evokable by acoustic as well as electric stimuli. Thus, the electric responses of the auditory system following acoustic stimulation and recorded by the conventional surface technique as well as by transtympanic derivation from the promontory (Electrocochleography [ECochG]) are used for the quantitative determination of hearing loss and, additionally, electrically evoked compound actions potentials (ECAP) can be recorded with the intracochlear electrodes of the implant just adjacent to the stimulation electrode to check the functional integrity of the device and its coupling to the auditory system...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29134419/acute-administration-of-the-nonpathogenic-saprophytic-bacterium-mycobacterium-vaccae-induces-activation-of-serotonergic-neurons-in-the-dorsal-raphe-nucleus-and-antidepressant-like-behavior-in-association-with-mild-hypothermia
#2
Philip H Siebler, Jared D Heinze, Drake M Kienzle, Matthew W Hale, Jodi L Lukkes, Nina C Donner, Jared M Kopelman, Orlando A Rodriguez, Christopher A Lowry
Peripheral immune activation can have profound physiologic and behavioral effects. One mechanism through which immune activation may affect physiology and behavior is through actions on brainstem neuromodulatory systems, such as serotonergic systems. To test this hypothesis, in Experiment 1, adult male BALB/c mice were implanted with telemetric recording devices and then immunized with Mycobacterium vaccae NCTC 11659 (0.1 mg, s.c.; Days - 28, - 14; N = 36). On Day 1, mice received an acute challenge with M...
November 13, 2017: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/29122298/evoked-potential-and-eeg-study-of-the-neurotoxicity-of-hydramethylnon-in-rats
#3
George M Strain
The objective of the study was to assess the neurotoxicity, using electrodiagnostic tests, of hydramethylnon (Amdro, AC 217,300), an insecticide marketed for the treatment of red imported fire ants, cockroaches, and other insects. Animals were male Fisher 344 albino rats and Long-Evans hooded rats. Brainstem auditory, visual, and somatosensory evoked potentials (BAER, VEP, SEP) and electroencephalograms (EEG) were recorded from implanted screw electrodes before and at multiple time points through day 10 after a single oral dose of hydramethylnon (at 50% or 75% of the LD50) plus vehicle, or vehicle alone...
October 31, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/29108871/effects-of-the-cannabinoid-cb1-agonist-acea-on-salicylate-ototoxicity-hyperacusis-and-tinnitus-in-guinea-pigs
#4
Joel I Berger, Ben Coomber, Samantha Hill, Steve P H Alexander, William Owen, Alan R Palmer, Mark N Wallace
Cannabinoids have been suggested as a therapeutic target for a variety of brain disorders. Despite the presence of their receptors throughout the auditory system, little is known about how cannabinoids affect auditory function. We sought to determine whether administration of arachidonyl-2'-chloroethylamide (ACEA), a highly-selective CB1 agonist, could attenuate a variety of auditory effects caused by prior administration of salicylate, and potentially treat tinnitus. We recorded cortical resting-state activity, auditory-evoked cortical activity and auditory brainstem responses (ABRs), from chronically-implanted awake guinea pigs, before and after salicylate + ACEA...
October 31, 2017: Hearing Research
https://www.readbyqxmd.com/read/29106852/postoperative-objective-detecting-techniques-for-cochlear-implant-children-with-inner-ear-malformation
#5
Xiao-Feng Qiao, Xin Li, Qiang-Wei Zhang, Tong-Li Li, Dong Wang
OBJECTIVES: This study aims to investigate the changing characteristics and rules of electrically-evoked auditory brainstem response (EABR), electrically-evoked stapedius reflex threshold (ESRT) and neural response telemetry (NRT) after cochlear implant in children with inner ear malformation, and guide postoperative equipment debug. METHODS: A total of 88 children with either normal cochlea (control group) or inner ear malformation (test group) received Australian 24 multi-channel cochlear implants...
November 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29098103/cochlear-implantation-in-patients-with-keratitis-ichthyosis-deafness-syndrome-a-report-of-two-cases
#6
Birgul Gumus, Armagan Incesulu, Mehmet Ozgur Pinarbasli
Background: Keratitis-ichthyosis-deafness (KID) syndrome is a syndrome which presents with hearing loss and visual and keratinization disorders. In such patients, hearing aids cannot be effectively used in the rehabilitation of hearing loss because of the frequent blockage of the external ear canal with epithelial debris and due to dry and tense skin of the external ear canal. Moreover, severe or profound hearing loss also limits the benefits gained from the conventional hearing aids...
2017: Case Reports in Otolaryngology
https://www.readbyqxmd.com/read/29089185/cannula-based-drug-delivery-to-the-guinea-pig-round-window-causes-a-lasting-hearing-loss-that-may-be-temporarily-mitigated-by-bdnf
#7
Phillip J P Sale, Aaron Uschakov, Tasfia Saief, David P Rowe, Carla J Abbott, Chi D Luu, Amy J Hampson, Stephen J O'Leary, David J Sly
Sustained local delivery of drugs to the inner ear may be required for future regenerative and protective strategies. The round window is surgically accessible and a promising delivery route. To be viable, a delivery system should not cause hearing loss. This study determined the effect on hearing of placing a drug-delivery microcatheter on to the round window, and delivering either artificial perilymph (AP) or brain-derived neurotrophic factor (BDNF) via this catheter with a mini-osmotic pump. Auditory brainstem responses (ABRs) were monitored for 4 months after surgery, while the AP or BDNF was administered for the first month...
October 28, 2017: Hearing Research
https://www.readbyqxmd.com/read/29076926/usefulness-of-electrical-auditory-brainstem-responses-to-assess-the-functionality-of-the-cochlear-nerve-using-an-intracochlear-test-electrode
#8
Luis Lassaletta, Marek Polak, Jan Huesers, Miguel Díaz-Gómez, Miryam Calvino, Isabel Varela-Nieto, Javier Gavilán
OBJECTIVE: To use an intracochlear test electrode to assess the integrity and the functionality of the auditory nerve in cochlear implant (CI) recipients and to compare electrical auditory brainstem responses (eABR) via the test electrode with the eABR responses with the CI. SETTING: Otolaryngology department, tertiary referral hospital. PATIENTS: Ten subjects (age at implantation 55 yr, range, 19-72) were subsequently implanted with a MED-EL CONCERTO CI on the side without any useful residual hearing...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29060273/auditory-responses-to-short-wavelength-infrared-neural-stimulation-of-the-rat-cochlear-nucleus
#9
Bin Jiang, Nan Xia, Xing Wang, Ning Hu, Xiao Y Wu, Yi Zhou, Wen S Hou
Pulsed Infrared laser is well-known for its high spatial resolution and contact-free stimulation mode. In order to improve the current auditory brainstem implants (ABI), 980 nm-short-wavelength infrared light was applied to stimulate the cochlear nucleus of rats. Single neural activity from contralateral inferior colliculus was recorded during laser stimulation. Animal experimental results showed that 980 nm laser could not directly activate neurons in cochlear nucleus and a photo-acoustic response was observed during stimulation, however, 980 nm laser produces an inhibitory effect on neural responses to sounds; After we added carbon nanoparticles onto the surface of animal cochlear nucleus, 980 nm laser could directly stimulate neurons and no interference between adjacent recording channels was observed...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29059697/stimulation-of-the-mesencephalic-locomotor-region-for-gait-recovery-after-stroke
#10
Felix Fluri, Uwe Malzahn, György A Homola, Michael K Schuhmann, Christoph Kleinschnitz, Jens Volkmann
OBJECTIVE: One-third of all stroke survivors are unable to walk, even after intensive physiotherapy. Thus, other concepts to restore walking are needed. Because electrical stimulation of the mesencephalic locomotor region (MLR) is known to elicit gait movements, this area might be a promising target for restorative neurostimulation in stroke patients with gait disability. The present study aims to delineate the effect of high-frequency stimulation of the MLR (MLR-HFS) on gait impairment in a rodent stroke model...
October 23, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/29053705/vagus-nerve-stimulation-in-pregnant-rats-and-effects-on-inflammatory-markers-in-the-brainstem-of-neonates
#11
Allison Judkins, Rhaya L Johnson, Samuel T Murray, Steven Yellon, Christopher G Wilson
BackgroundVagus Nerve Stimulation (VNS) is an FDA-approved method delivering electrical impulses for treatment of depression and epilepsy in adults. The vagus nerve innervates the majority of visceral organs and cervix, but potential impacts of VNS on the progress of pregnancy and the fetus are not well studied.MethodsWe tested the hypothesis that VNS in pregnant dams does not induce inflammatory changes in the cardiorespiratory control regions of the pups' brainstem, potentially impacting the morbidity and mortality of offspring...
October 20, 2017: Pediatric Research
https://www.readbyqxmd.com/read/29044737/chronic-bmy7378-treatment-alters-behavioral-circadian-rhythms
#12
Jhenkruthi Vijaya Shankara, Angélique Orr, Richelle Mychasiuk, Michael C Antle
The mammalian circadian clock is synchronized to the day:night cycle by light. Serotonin modulates the circadian effects of light, with agonists inhibiting response to light and antagonists enhancing responses to light. A special class of serotonergic compounds, the mixed 5-HT1A agonist/antagonists, potentiate light-induced phase advances by up to 400% when administered acutely. In this study, we examine the effects of one of these mixed 5-HT1A agonist/antagonists, BMY7378, when administered chronically. Thirty adult male hamsters were administered either vehicle or BMY7378 via surgically implanted osmotic minipumps over a period of 28 days...
October 17, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29036751/-diagnosis-and-management-of-vestibular-schwannomas-an-interdisciplinary-challenge
#13
Steffen Rosahl, Christopher Bohr, Michael Lell, Klaus Hamm, Heinrich Iro
Vestibular schwannomas expand slowly in the internal auditory canal, in the cerebellopontine angle, inside the cochlear and the labyrinth. Larger tumors can displace and compress the brainstem. With an annual incidence of 1:100 000 vestibular schwannoma represent 6-7% of all intracranial tumors. In the cerebellopontine angle they are by far the most neoplasm with 90% of all lesions located in this region. Magnetic resonance imaging (MRI), audiometry, and vestibular diagnostics are the mainstays of the clinical workup for patients harboring tumors...
April 2017: Laryngo- Rhino- Otologie
https://www.readbyqxmd.com/read/29030455/optimal-deep-brain-stimulation-site-and-target-connectivity-for-chronic-cluster-headache
#14
Harith Akram, Sarah Miller, Susie Lagrata, Marwan Hariz, John Ashburner, Tim Behrens, Manjit Matharu, Ludvic Zrinzo
OBJECTIVE: To investigate the mechanism of action of deep brain stimulation for refractory chronic cluster headache and the optimal target within the ventral tegmental area. METHODS: Seven patients with refractory chronic cluster headache underwent high spatial and angular resolution diffusion MRI preoperatively. MRI-guided and MRI-verified electrode implantation was performed unilaterally in 5 patients and bilaterally in 2. Volumes of tissue activation were generated around active lead contacts with a finite-element model...
October 13, 2017: Neurology
https://www.readbyqxmd.com/read/29023243/pediatric-auditory-brainstem-implantation-surgical-electrophysiologic-and-behavioral-outcomes
#15
Holly F B Teagle, Lillian Henderson, Shuman He, Matthew G Ewend, Craig A Buchman
OBJECTIVES: The objectives of this study were to demonstrate the safety of auditory brainstem implant (ABI) surgery and document the subsequent development of auditory and spoken language skills in children without neurofibromatosis type II (NFII). DESIGN: A prospective, single-subject observational study of ABI in children without NFII was undertaken at the University of North Carolina at Chapel Hill. Five children were enrolled under an investigational device exemption sponsored by the investigators...
October 11, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28968281/the-electrically-evoked-auditory-change-complex-evoked-by-temporal-gaps-using-cochlear-implants-or-auditory-brainstem-implants-in-children-with-cochlear-nerve-deficiency
#16
Shuman He, Tyler C McFayden, Bahar S Shahsavarani, Holly F B Teagle, Matthew Ewend, Lillian Henderson, Craig A Buchman
OBJECTIVES: This study aimed to (1) establish the feasibility of measuring the electrically evoked auditory change complex (eACC) in response to temporal gaps in children with cochlear nerve deficiency (CND) who are using cochlear implants (CIs) and/or auditory brainstem implants (ABIs); and (2) explore the association between neural encoding of, and perceptual sensitivity to, temporal gaps in these patients. DESIGN: Study participants included 5 children (S1 to S5) ranging in age from 3...
September 29, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28964288/the-value-of-intraoperative-eabrs-in-auditory-brainstem-implantation
#17
Abbas Anwar, Alison Singleton, Yixin Fang, Binhuan Wang, William Shapiro, J Thomas Roland, Susan B Waltzman
OBJECTIVE: To compare the intraoperative electrically evoked auditory brainstem response (EABR) morphologies between neurofibromatosis II (NF2) adult auditory brainstem implant (ABI) recipients who had auditory percepts post-operatively and those who did not and between NF2 adult ABI recipients and non-NF2 pediatric ABI recipients. METHODS: This was a retrospective case series at a single tertiary academic referral center examining all ABI recipients from 1994 to 2016, which included 34 NF2 adults and 11 non-NF2 children...
October 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28925013/an-animal-model-of-deep-brain-stimulation-for-treating-tinnitus-a-proof-of-concept-study
#18
Syed F Ahsan, Hao Luo, Jinsheng Zhang, Eric Kim, Yong Xu
OBJECTIVE: This proof-of-concept study aimed to demonstrate therapeutic effects of deep brain stimulation (DBS) on noise-induced tinnitus. STUDY DESIGN: Experimental animal study. METHODS: After Institutional Animal Care and Use Committee approval, nine adult rats were implanted in the caudate nucleus with custom-made electrode array. The rats were exposed to noise to induce tinnitus. Auditory brainstem response was performed to evaluate hearing threshold changes...
September 19, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28904101/methodological-considerations-for-a-chronic-neural-interface-with-the-cuneate-nucleus-of-macaques
#19
Aneesha K Suresh, Jeremy Winberry, Christopher Versteeg, Raeed H Chowdhury, Tucker Tomlinson, Joshua M Rosenow, Lee E Miller, Sliman J Bensmaia
While the response properties of neurons in the somatosensory nerves and anterior parietal cortex have been extensively studied, little is known about the encoding of tactile and proprioceptive information in the cuneate nucleus (CN) or external cuneate nucleus (ECN), the first recipients of upper limb somatosensory afferent signals. The major challenge in characterizing neural coding in CN/ECN has been to record from these tiny, difficult to access brainstem structures. Most previous investigations of CN response properties have been carried out in decerebrate or anesthetized animals, thereby eliminating the well-documented top-down signals from cortex, which likely exert a strong influence on CN responses...
September 13, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28894826/functional-and-histological-effects-of-chronic-neural-electrode-implantation
#20
REVIEW
Ronald Sahyouni, David T Chang, Omid Moshtaghi, Amin Mahmoodi, Hamid R Djalilian, Harrison W Lin
OBJECTIVES: Permanent injury to the cranial nerves can often result in a substantial reduction in quality of life. Novel and innovative interventions can help restore form and function in nerve paralysis, with bioelectric interfaces among the more promising of these approaches. The foreign body response is an important consideration for any bioelectric device as it influences the function and effectiveness of the implant. The purpose of this review is to describe tissue and functional effects of chronic neural implantation among the different categories of neural implants and highlight advances in peripheral and cranial nerve stimulation...
April 2017: Laryngoscope Investigative Otolaryngology
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