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https://www.readbyqxmd.com/read/28424657/magnetic-vestibular-stimulation-mvs-as-a-technique-for-understanding-the-normal-and-diseased-labyrinth
#1
REVIEW
Bryan K Ward, Jorge Otero-Millan, Prem Jareonsettasin, Michael C Schubert, Dale C Roberts, David S Zee
Humans often experience dizziness and vertigo around strong static magnetic fields such as those present in an MRI scanner. Recent evidence supports the idea that this effect is the result of inner ear vestibular stimulation and that the mechanism is a magnetohydrodynamic force (Lorentz force) that is generated by the interactions between normal ionic currents in the inner ear endolymph and the strong static magnetic field of MRI machines. While in the MRI, the Lorentz force displaces the cupula of the lateral and anterior semicircular canals, as if the head was rotating with a constant acceleration...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28420953/using-cochlear-microphonic-potentials-to-localize-peripheral-hearing-loss
#2
Karolina K Charaziak, Christopher A Shera, Jonathan H Siegel
The cochlear microphonic (CM) is created primarily by the receptor currents of outer hair cells (OHCs) and may therefore be useful for identifying cochlear regions with impaired OHCs. However, the CM measured across the frequency range with round-window or ear-canal electrodes lacks place-specificity as it is dominated by cellular sources located most proximal to the recording site (e.g., at the cochlear base). To overcome this limitation, we extract the "residual" CM (rCM), defined as the complex difference between the CM measured with and without an additional tone (saturating tone, ST)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28420022/-severe-bleeding-from-the-middle-ear-cavity-after-myringotomy-review-based-on-a-case-report
#3
Veit M Hofmann, Stefan M Niehues, Andreas E Albers, Annett Pudszuhn
Report of a rare case of severe bleeding from the middle ear cavity after myringotomy. On the basis of the case report, the procedure for such bleeding is discussed in the context of the literature. A 6-year-old boy received a revision myringotomy in an ambulant setting. During the procedure a severe bleeding occurred. The external auditory canal was adequately packed. The patient was extubated and transferred to the clinic as an emergency. Computer tomography of the temporal bone showed the anatomical variant of a dehiscent high jugular bulb, which had been injured...
March 2017: Laryngo- Rhino- Otologie
https://www.readbyqxmd.com/read/28417109/intractable-methicillin-resistant-staphylococcus-aureus-otorrhea-with-silicone-impression-in-the-middle-ear
#4
Eun Kyung Jung, Chul Ho Jang, Jong Yuap Seong, Yong Beom Cho
We report a case of methicillin-resistant Staphylococcus aureus (MRSA) otorrhea with impression material of hearing aid in the middle ear. The patient had chronic otitis media in the right ear with sensorineural hearing loss in both ears. The silicone flowed into the middle ear through a tympanic membrane perforation during the process of making an ear mold. Several days after hearing aid fitting, the patient had severe otalgia, intractable otorrhea, aggravated hearing loss, and dizziness. The pus culture and sensitivity test revealed MRSA...
April 2017: Journal of Audiology & Otology
https://www.readbyqxmd.com/read/28417060/burden-and-predictors-of-staphylococcus-aureus-and-s-pseudintermedius-infections-among-dogs-presented-at-an-academic-veterinary-hospital-in-south-africa-2007-2012
#5
Daniel N Qekwana, James Wabwire Oguttu, Fortune Sithole, Agricola Odoi
BACKGROUND: Staphylococci are commensals of the mucosal surface and skin of humans and animals, but have been implicated in infections such as otitis externa, pyoderma, urinary tract infections and post-surgical complications. Laboratory records provide useful information to help investigate these infections. Therefore, the objective of this study was to investigate the burdens of these infections and use multinomial regression to examine the associations between various Staphylococcus infections and demographic and temporal factors among dogs admitted to an academic veterinary hospital in South Africa...
2017: PeerJ
https://www.readbyqxmd.com/read/28416346/bilateral-spontaneous-symptomatic-temporomandibular-joint-herniation-into-the-external-auditory-canal-a-case-report-and-literature-review
#6
Yong Won Lee, Yong Ho Park
Spontaneous temporomandibular joint (TMJ) herniation is the entity of protrusion of the retrodiscal contents of the TMJ into the external auditory canal (EAC) through a persistent Huschke's foramen. There have been a number of reports of spontaneous TMJ herniation, but there are no reports of bilateral symptomatic TMJ herniation. We report a case of a 70-year-old man who complained of a crunching sound in both ears during mastication. Examination showed bulging from the anterosuperior wall of the EAC on each side when the patient opened his mouth, which pushed the tympanic membrane medially...
April 14, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/28414695/imaging-criteria-to-predict-surgical-difficulties-during-stapes-surgery
#7
Claire Parra, Stéphanie Trunet, Benjamin Granger, Yann Nguyen, Georges Lamas, Daniele Bernardeschi, Rémi Hervochon, Frédéric Tankere
BACKGROUND AND PURPOSE: Stapes surgery for otosclerosis can be challenging if access to the oval window niche is restricted. The aim of this study was to determine the accuracy of the computed tomographic (CT) scan in the evaluation of anatomical distances, and to analyze its reliability in predicting surgical technical difficulties. MATERIAL AND METHODS: A total of 96 patients (101 ears) were enrolled in a prospective study between 2012 and May 2015. During surgery, we evaluated the distance D1 between the stapes and the facial nerve, distance D2 between the promontory and the facial nerve after ablation of the superstructure, and the intraoperative discomfort of the surgeon...
April 13, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28397138/middle-fossa-approach-for-resection-of-vestibular-schwannoma
#8
Gmaan Alzhrani, Clough Shelton, William T Couldwell
BACKGROUND: Surgical approaches for removal of vestibular schwannoma are done through retrosigmoid, translabyrinthine, or middle fossa approaches, depending on the tumor size, preoperative hearing status, surgical team experience, and patient preference. The middle fossa approach (MFA) for the vestibular schwannoma (VS) route preserves hearing and can be done with minimal morbidity and mortality. METHOD: The authors discuss the surgical anatomy of the middle fossa, internal auditory canal localization techniques, MFA indications and the procedure for VS removal, and outcome...
April 11, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28396871/innervation-of-the-human-cavum-conchae-and-auditory-canal-anatomical-basis-for-transcutaneous-auricular-nerve-stimulation
#9
P Bermejo, M López, I Larraya, J Chamorro, J L Cobo, S Ordóñez, J A Vega
The innocuous transcutaneous stimulation of nerves supplying the outer ear has been demonstrated to be as effective as the invasive direct stimulation of the vagus nerve for the treatment of some neurological and nonneurological disturbances. Thus, the precise knowledge of external ear innervation is of maximal interest for the design of transcutaneous auricular nerve stimulation devices. We analyzed eleven outer ears, and the innervation was assessed by Masson's trichrome staining, immunohistochemistry, or immunofluorescence (neurofilaments, S100 protein, and myelin-basic protein)...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28395493/-light-cupulopathy-persistent-direction-changing-positional-nystagmus-with-a-null-plane
#10
S J Wang, H Jiang, Z Q Gao, H Y Wu
Objective: The purpose of this study was to report two cases of light cupulopathy, and describe the characteristics of these cases and analysis the possible physiopathological mechanisms. Methods: The histories, clinical features, characteristics of nystagmus, and vestibular function, as well as audiologic results of the two patients with light cupula were analyzed. Results: The two patients showed persistent geotropic direction changing positional nystagmus(DCPN)in the supine head roll tests. The null plane was present when the head was turn slightly towards affected side...
March 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/28386500/diagnostic-bedside-vestibuloocular-reflex-evaluation-in-the-setting-of-a-false-negative-fistula-test-in-cholesteatoma-of-the-middle-ear
#11
Ricardo D'Albora, Ligia Silveira, Sergio Carmona, Nicolas Perez-Fernandez
Background. False negative fistula testing in patients with chronic suppurative otitis media is a dilemma when proceeding to surgery. It is imperative to rule out a dead labyrinth or a mass effect secondary to the cholesteatoma in an otherwise normally functioning inner ear. We present a case series of three patients in whom a bedside vestibuloocular reflex (VOR) evaluation using a head impulse test was used successfully for further evaluation prior to surgery. Results. In all three cases with a false negative fistula test we were able to further evaluate at the bedside and were not only able to register the abnormal VOR but also localize its deterioration to a particular semicircular canal eroded by the fistula...
2017: Case Reports in Otolaryngology
https://www.readbyqxmd.com/read/28384124/single-channel-in-ear-eeg-detects-the-focus-of-auditory-attention-to-concurrent-tone-streams-and-mixed-speech
#12
Lorenz Fiedler, Malte Wöstmann, Carina Graversen, Alex Brandmeyer, Thomas Lunner, Jonas Obleser
OBJECTIVE: Conventional, multi-channel scalp electroencephalography (EEG) allows the identification of the attended speaker in concurrent-listening ('cocktail party') scenarios. This implies that EEG might provide valuable information to complement hearing aids with some form of EEG and to install a level of neuro-feedback. APPROACH: To investigate whether a listener's attentional focus can be detected from single-channel hearing-aid-compatible EEG configurations, we recorded EEG from three electrodes inside the ear canal ('in-Ear-EEG') and additionally from 64 electrodes on the scalp...
April 6, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28383365/design-and-validation-of-a-three-dimensional-printed-flexible-canine-otoscopy-teaching-model
#13
Belle Marie D Nibblett, Mary Mauldin Pereira, Fortune Sithole, Paul A D Orchard, Eric B Bauman
INTRODUCTION: A teaching model was sought to improve canine otoscopy skill and reduce use of teaching dogs. METHODS: An otoscopy teaching model was printed in a flexible medium on a desktop three-dimensional printer from a magnetic resonance image of a canine external ear canal. The model was mounted in a polyvinyl dog mannequin. Validation of the teaching model was sought from student, faculty, and dog perspective. Student perception of prelaboratory training was assessed using a survey regarding their experience...
April 5, 2017: Simulation in Healthcare: Journal of the Society for Simulation in Healthcare
https://www.readbyqxmd.com/read/28382131/superior-semicircular-canal-dehiscence-syndrome-diagnosis-and-surgical-management
#14
Marite Palma Diaz, Juan Carlos Cisneros Lesser, Alfredo Vega Alarcón
Introduction Superior semicircular canal dehiscence syndrome was described by Minor et al in 1998. It is a troublesome syndrome that results in vertigo and oscillopsia induced by loud sounds or changes in the pressure of the external auditory canal or middle ear. Patients may present with autophony, hyperacusis, pulsatile tinnitus and hearing loss. When symptoms are mild, they are usually managed conservatively, but surgical intervention may be needed for patients with debilitating symptoms. Objective The aim of this manuscript is to review the different surgical techniques used to repair the superior semicircular canal dehiscence...
April 2017: International Archives of Otorhinolaryngology
https://www.readbyqxmd.com/read/28375041/prevalence-of-external-ear-disorders-in-belgian-stray-cats
#15
Anouck Bollez, Hilde de Rooster, Alessandra Furcas, Sophie Vandenabeele
Objectives Feline otitis externa is a multifactorial dermatological disorder about which very little is known. The objective of this study was to map the prevalence of external ear canal disorders and the pathogens causing otitis externa in stray cats roaming around the region of Ghent, Belgium. Methods One hundred and thirty stray cats were randomly selected during a local trap-neuter-return programme. All cats were European Shorthairs. This study included clinical, otoscopic and cytological evaluation of both external ears of each cat...
April 1, 2017: Journal of Feline Medicine and Surgery
https://www.readbyqxmd.com/read/28372113/characterizing-spontaneous-otoacoustic-emissions-across-the-human-lifespan
#16
Carolina Abdala, Ping Luo, Christopher A Shera
This study characterizes 1571 archival and newly acquired spontaneous otoacoustic emissions (SOAEs) from 632 human subjects with ages ranging from premature birth through the seventh decade of life. Automated detection and Lorentzian modeling were applied to identify SOAEs and characterize SOAE features throughout the human lifespan. Results confirm higher-level, higher-frequency, and more numerous SOAEs from neonates compared to young adults. Approximately 85% of newborns have measurable SOAEs as compared to 51%-68% for young adults...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28372092/attenuating-the-ear-canal-feedback-pressure-of-a-laser-driven-hearing-aid
#17
Morteza Khaleghi, Sunil Puria
Microphone placement behind the pinna, which minimizes feedback but also reduces perception of the high-frequency pinna cues needed for sound localization, is one reason why hearing-aid users often complain of poor sound quality and difficulty understanding speech in noisy situations. In this paper, two strategies are investigated for minimizing the feedback pressure (thereby increasing the maximum stable gain, MSG) of a wide-bandwidth light-activated contact hearing aid (CHA) to facilitate microphone placement in the ear canal (EC): (1) changing the location of the drive force and its direction at the umbo, and (2) placing an acoustic damper within the EC to reduce the feedback pressure at the microphone location...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28367981/cochlear-gene-therapy-with-ancestral-aav-in-adult-mice-complete-transduction-of-inner-hair-cells-without-cochlear-dysfunction
#18
Jun Suzuki, Ken Hashimoto, Ru Xiao, Luk H Vandenberghe, M Charles Liberman
The use of viral vectors for inner ear gene therapy is receiving increased attention for treatment of genetic hearing disorders. Most animal studies to date have injected viral suspensions into neonatal ears, via the round window membrane. Achieving transduction of hair cells, or sensory neurons, throughout the cochlea has proven difficult, and no studies have been able to efficiently transduce sensory cells in adult ears while maintaining normal cochlear function. Here, we show, for the first time, successful transduction of all inner hair cells and the majority of outer hair cells in an adult cochlea via virus injection into the posterior semicircular canal...
April 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28346654/glomus-jugulare-manifesting-as-angiogenesis-of-the-external-ear-canal
#19
Sei Y Chung, James K Liu, Richard Chan Park, Robert W Jyung
No abstract text is available yet for this article.
March 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/28346293/comparison-of-experts-and-residents-performing-a-complex-procedure-in-a-temporal-bone-surgery-simulator
#20
Ioanna Ioannou, Yun Zhou, Sudanthi Wijewickrema, Patorn Piromchai, Bridget Copson, Gregor Kennedy, Stephen O'Leary
OBJECTIVE: To investigate the use of automated metrics from a virtual reality (VR) temporal bone surgery simulator to determine how the performance of experts and trainees differs when performing a complex otological procedure (mastoidectomy with posterior tympanotomy and cochleostomy). STUDY DESIGN: Cohort study. METHODS: Using the University of Melbourne VR temporal bone surgery simulator, seven ENT consultants and seven ENT residents performed two trials of the surgical approach to cochlear implantation on a virtual temporal bone...
March 24, 2017: Otology & Neurotology
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