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Cochlear nerve

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https://www.readbyqxmd.com/read/29452830/usefulness-of-reconstructed-3d-images-for-cochlear-implantation-in-a-case-with-a-facial-nerve-anomaly
#1
Kenichi Nakamura, Mari Shimada Dias, Toru Sasaki, Hisashi Sugimoto, Miyako Hatano, Makoto Ito
Facial nerve anomalies are a potential problem in patients with cochleovestibular malformations. A case of cochlear implant (CI) surgery in the presence of intra-temporalbone facial nerve bifurcation is presented. During the first surgery, the facial nerve bifurcation obscured the promontory and round window. It was difficult to perform cochleostomy because of the lack of landmarks of the basal turn of the cochlea, and the first surgical attempt at cochleostomy was abandoned. A repeat CT scan was performed after the first surgery with reconstructed 3D images of the temporal bone and the cochlea, and then the cochlea was successfully opened at revision surgery...
February 14, 2018: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/29447896/bony-cochlear-nerve-canal-stenosis-in-pediatric-unilateral-sensorineural-hearing-loss
#2
Chae-Hyun Lim, Ji Hyung Lim, Doyoun Kim, Ho Sung Choi, Dong-Hee Lee, Dong-Kee Kim
OBJECTIVES: This study was performed to evaluate the frequency of bony cochlear nerve canal (BCNC) stenosis and its clinical significance in pediatric patients with unilateral sensorineural hearing loss (SNHL) of unknown etiology. MATERIALS AND METHODS: We analyzed the medical records and temporal bone computed tomography (CT) results of patients less than 13 years of age with a diagnosis of unilateral SNHL of unknown etiology between July 2007 and July 2017. We compared the BCNC diameter between both sides and analyzed the age at diagnosis, degree of hearing loss, and accompanying inner ear anomalies...
March 2018: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29447794/plasticity-after-pediatric-cochlear-implantation-implication-from-changes-in-peripheral-plasma-level-of-bdnf-and-auditory-nerve-responses
#3
Razieh Alemi, Masoud Motassadi Zarandy, Mohammad Taghi Joghataei, Ali Eftekharian, Mohammad Reza Zarrindast, Nasim Vousooghi
INTRODUCTION: Sensory neural hearing loss could lead to some structural and physiological changes in the auditory pathways, such as alteration in the expression of neurotrophins. These factors, especially Brain-Derived Neurotrophic Factor (BDNF), play an important role in synaptic functions and experience-related plasticity. Restoring cochlear function after hearing loss is possible through cochlear implantation (CI). Evaluation of the blood concentration changes of neurotrophins as prerequisites of plasticity could help scientists to determine the prognosis of CI as in the candidacy procedure or enhancing prosthesis function by adding the exact needed amount of BDNF to the electrode array...
February 2018: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29401591/the-glucocorticoid-antagonist-mifepristone-attenuates-sound-induced-long-term-deficits-in-auditory-nerve-response-and-central-auditory-processing-in-female-rats
#4
Wibke Singer, Kamyar Kasini, Marie Manthey, Philipp Eckert, Philipp Armbruster, Miriam Annika Vogt, Mirko Jaumann, Michela Dotta, Kohei Yamahara, Csaba Harasztosi, Ulrike Zimmermann, Marlies Knipper, Lukas Rüttiger
Systemic corticosteroids have been the mainstay of treatment for various hearing disorders for more than 30 yr. Accordingly, numerous studies have described glucocorticoids (GCs) and stressors to be protective in the auditory organ against damage associated with a variety of health conditions, including noise exposure. Conversely, stressors are also predictive risk factors for hearing disorders. How both of these contrasting stress actions are linked has remained elusive. Here, we demonstrate that higher corticosterone levels during acoustic trauma in female rats is highly correlated with a decline of auditory fiber responses in high-frequency cochlear regions, and that hearing thresholds and the outer hair cell functions (distortion products of otoacoustic emissions) are left unaffected...
January 12, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29360086/surgical-results-and-complications-of-cochlear-implantation-in-far-advanced-otosclerosis
#5
Niels West, Markus Brand, Søren Foghsgaard, Per Cayé-Thomasen
OBJECTIVE: To report surgical results and complications of cochlear implantation in patients with far-advanced otosclerosis (FAO). MATERIALS AND METHODS: This was a retrospective chart review of surgical results in terms of electrode insertion as well as peri- and postoperative complications. Ten cochlear implantations (CIs) were performed in eight patients with FAO. A prior stapedotomy had been performed in all cases. RESULTS: Full electrode insertion was achieved in nine of the 10 operations (90%) and partial insertion in one operation...
December 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/29351276/static-length-changes-of-cochlear-outer-hair-cells-can-tune-low-frequency-hearing
#6
Nikola Ciganović, Rebecca L Warren, Batu Keçeli, Stefan Jacob, Anders Fridberger, Tobias Reichenbach
The cochlea not only transduces sound-induced vibration into neural spikes, it also amplifies weak sound to boost its detection. Actuators of this active process are sensory outer hair cells in the organ of Corti, whereas the inner hair cells transduce the resulting motion into electric signals that propagate via the auditory nerve to the brain. However, how the outer hair cells modulate the stimulus to the inner hair cells remains unclear. Here, we combine theoretical modeling and experimental measurements near the cochlear apex to study the way in which length changes of the outer hair cells deform the organ of Corti...
January 19, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29340754/preoperative-evaluation-of-cochlear-implantation-through-the-round-window-membrane-in-the-facial-recess-using-high-resolution-computed-tomography
#7
Li-Hong Xie, Jie Tang, Wen-Jie Miao, Xiang-Long Tang, Heng Li, An-Zhou Tang
PURPOSE: We evaluated the risk of cochlear implantation through the round window membrane in the facial recess through a preoperative analysis of the angle between the facial nerve-round window and the cranial midline using high-resolution temporal bone CT. METHODS: Temporal bone CT films of 176 patients with profound sensorineural hearing loss at our hospital from 2013 to 2015 were reviewed. The preoperative temporal bone CT scans of the patients were retrospectively analysed...
January 16, 2018: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29338942/international-consensus-icon-on-treatment-of-m%C3%A3-ni%C3%A3-re-s-disease
#8
J Nevoux, M Barbara, J Dornhoffer, W Gibson, T Kitahara, V Darrouzet
OBJECTIVE: To present the international consensus for recommendations for Ménière's disease (MD) treatment. METHODS: Based on a literature review and report of 4 experts from 4 continents, the recommendations have been presented during the 21st IFOS congress in Paris, in June 2017 and are presented in this work. RESULTS: The recommendation is to change the lifestyle, to use the vestibular rehabilitation in the intercritic period and to propose psychotherapy...
January 12, 2018: European Annals of Otorhinolaryngology, Head and Neck Diseases
https://www.readbyqxmd.com/read/29337762/tinnitus-and-auditory-perception-after-a-history-of-noise-exposure-relationship-to-auditory-brainstem-response-measures
#9
Naomi F Bramhall, Dawn Konrad-Martin, Garnett P McMillan
OBJECTIVES: To determine whether auditory brainstem response (ABR) wave I amplitude is associated with measures of auditory perception in young people with normal distortion product otoacoustic emissions (DPOAEs) and varying levels of noise exposure history. DESIGN: Tinnitus, loudness tolerance, and speech perception ability were measured in 31 young military Veterans and 43 non-Veterans (19 to 35 years of age) with normal pure-tone thresholds and DPOAEs. Speech perception was evaluated in quiet using Northwestern University Auditory Test (NU-6) word lists and in background noise using the words in noise (WIN) test...
January 15, 2018: Ear and Hearing
https://www.readbyqxmd.com/read/29334639/vestibular-schwannoma-and-hearing-preservation-usefulness-of-level-specific-ce-chirp-abr-monitoring-a-retrospective-study-on-25-cases-with-preoperative-socially-useful-hearing
#10
Luciano Mastronardi, Ettore Di Scipio, Guglielmo Cacciotti, Raffaelino Roperto
BACKGROUND AND OBJECTIVES: Decision-making regarding the therapy of vestibular schwannoma (VS) changed over the last decades, during which curative microsurgery has been promoted. Goals of VS microsurgery are: extensive resection, facial nerve (FN) preservation and, in selected cases, hearing preservation (HP). The aim of this study is to evaluate postoperative HP with reference to tumor size in patients operated on with Level Specific (LS)-CE-Chirp® ABR monitoring. PATIENTS AND METHODS: Twentyfive consecutive patients with socially useful hearing (SUH) underwent VS microneurosurgery by retrosigmoid (RS) approach...
February 2018: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29315178/utilization-of-nerve-integrity-monitor-for-promontory-stimulation-testing-prior-to-cochlear-implant
#11
Elizabeth A Kelly, Samuel Levine, Kristin E Gravel, Dianna L Hart, Tina Huang
OBJECTIVE: To demonstrate the feasibility of a nerve integrity monitor as a tool for promontory stimulation testing in patients with profound sensorineural hearing loss considering cochlear implantation. PATIENTS: Adult patients considered for cochlear implantation with no auditory response on audiometric testing INTERVENTION:: Promontory stimulation testing using the nerve integrity monitor. MAIN OUTCOME MEASURE: By using a facial nerve stimulator and the nerve integrity monitor, transtympanic promontory stimulation testing was performed to assess auditory nerve function and determine candidacy for cochlear implantation...
February 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29304127/do-experts-practice-what-they-profess
#12
Yun Zhou, Sudanthi Wijewickrema, Ioanna Ioannou, James Bailey, Gregor Kennedy, Debra Nestel, Stephen O'Leary
We investigated the variation of drilled regions of expert and trainee surgeons performing virtual temporal bone surgery to identify their compliance with standard drilling procedures. To this end, we recruited seven expert and six trainee ENT surgeons, who were asked to perform the surgical preparations for cochlear implantation on a virtual temporal bone. The temporal bone was divided into six regions using a semi-automated approach. The drilled area in each region was compared between groups using a sign test...
2018: PloS One
https://www.readbyqxmd.com/read/29298868/auditory-somatosensory-bimodal-stimulation-desynchronizes-brain-circuitry-to-reduce-tinnitus-in-guinea-pigs-and-humans
#13
Kendra L Marks, David T Martel, Calvin Wu, Gregory J Basura, Larry E Roberts, Kara C Schvartz-Leyzac, Susan E Shore
The dorsal cochlear nucleus is the first site of multisensory convergence in mammalian auditory pathways. Principal output neurons, the fusiform cells, integrate auditory nerve inputs from the cochlea with somatosensory inputs from the head and neck. In previous work, we developed a guinea pig model of tinnitus induced by noise exposure and showed that the fusiform cells in these animals exhibited increased spontaneous activity and cross-unit synchrony, which are physiological correlates of tinnitus. We delivered repeated bimodal auditory-somatosensory stimulation to the dorsal cochlear nucleus of guinea pigs with tinnitus, choosing a stimulus interval known to induce long-term depression (LTD)...
January 3, 2018: Science Translational Medicine
https://www.readbyqxmd.com/read/29298210/electrophysiology-of-cranial-nerve-testing-auditory-nerve
#14
Alan D Legatt
The electrocochleogram and brainstem auditory evoked potentials (BAEPs) are electrophysiologic signals used to assess the auditory nerve. The electrocohleogram includes the cochlear microphonic, the cochlear summating potential, and the eighth nerve compound action potential. It is used predominantly for hearing assessment and for diagnosis of Ménière disease and auditory neuropathy. Brainstem auditory evoked potentials are used for hearing assessment, diagnosis of dysfunction within the cochlea, the auditory nerve, and the brainstem auditory pathways up to the level of the mesencephalon, and intraoperative monitoring of these structures...
January 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29287891/characteristics-of-electrically-evoked-auditory-brainstem-responses-in-patients-with-cochlear-nerve-canal-stenosis-receiving-cochlear-implants
#15
Zhenxiao Wang, Yun Liu, Line Wang, Xixi Shen, Shuguang Han, Wei Wang, Fenqi Gao, Wenqi Liang, Kevin A Peng
OBJECTIVE: To explore the characteristics of the electrically evoked auditory brainstem responses (EABR) in children with cochlear nerve canal stenosis (CNCs) following cochlear implantation (CI), and the EABR thresholds in children with stenotic versus normal cochlear nerve canals. METHOD: Sixteen children with profound sensorineural hearing loss were included in this study: 8 with CNCs (CNCs group) and 8 with normal cochlear nerve canals (control group). All children underwent cochlear implantation with full insertion of all electrodes...
January 2018: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29284876/dexmedetomidine-versus-magnesium-sulfate-in-anesthesia-for-cochlear-implantation-surgery-in-pediatric-patients
#16
Passaint Fahim Hassan, Amany Hassan Saleh
Context: Cochlear implantation surgery represents a great advance in ENT surgeries. Special anesthetic managements were required to provide bloodless surgical field and monitoring of the facial nerve. Aims: We aimed to compare both dexmedetomidine and magnesium sulfate as regards their efficacy in inducing deliberate hypotension and providing better quality of the surgical field during cochlear implantation in pediatrics. Settings and Design: Prospective, randomized double-blinded study...
October 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/29283099/radiological-evaluation-of-inner-ear-with-computed-tomography-in-patients-with-unilateral-non-pulsatile-tinnitus
#17
Emre Ocak, Deniz Kocaöz, Baran Acar, Selma Uysal Ramadan, Melih Topçuoğlu
OBJECTIVE: The objective of this research was to investigate the possible relationship between tinnitus and certain bony inner ear structures using computed tomography (CT). MATERIALS AND METHODS: This was a prospective, controlled, double-blind study. The subjects of the study were divided into the following three groups: group 1 (G1), patients with unilateral sensorineural hearing loss (SNHL) and unilateral non-pulsatile tinnitus in the same ear; group 2 (G2), patients with normal hearing and unilateral non-pulsatile tinnitus; and group 3 (G3), healthy volunteers with neither tinnitus nor hearing loss...
December 14, 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/29283095/evaluation-of-cervical-vestibular-evoked-myogenic-potential-in-subjects-with-chronic-noise-exposure
#18
Nehal Mamdouh Abd El Salam, Elshahat Ibrahem Ismail, Ayman El Saeed El Sharabasy
OBJECTIVE: Noise has been recognized as a major cause of cochlear damage resulting in both tinnitus and hearing loss. On the other hand, damage to the vestibular system, especially the saccule, can be considered as a potential problem. The cervical vestibular-evoked myogenic potentials (cVEMPs) have been established as a clinical test of measuring both sac-cular and inferior vestibular nerve function. Therefore, it is thought to be sensitive to the noise-induced damage to the vestibular system...
December 14, 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/29283094/a-comparison-of-cochlear-nerve-size-in-normal-hearing-adults-using-magnetic-resonance-imaging
#19
Christoper Heining, Theofano Tikka, Steve Colley, Laura Zilinskiene, Chris Coulson
OBJECTIVE: Cochlear implantation is a clinical and cost-effective treatment for severe hearing loss. Cochlear nerve size assessment by magnetic resonance imaging (MRI) has been investigated for use as a prognostic indicator following cochlear implantation. This study aimed to further that research by assessing nerve size in normal-hearing adults for symmetry. MATERIALS AND METHODS: Patients with tinnitus presenting to our center retrospectively had their nerve size assessed by MRI...
December 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/29279723/diagnostics-and-therapy-of-vestibular-schwannomas-an-interdisciplinary-challenge
#20
REVIEW
Steffen Rosahl, Christopher Bohr, Michael Lell, Klaus Hamm, Heinrich Iro
Vestibular schwannomas (VS) 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...
2017: GMS Current Topics in Otorhinolaryngology, Head and Neck Surgery
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