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https://www.readbyqxmd.com/read/28641325/superior-canal-dehiscence-syndrome-associated-with-scuba-diving
#1
Naoharu Kitajima, Akemi Sugita-Kitajima, Seiji Kitajima
A 28-year-old female diver presented with dizziness and difficulty clearing her left ear whilst scuba diving. Her pure-tone audiometry and tympanometry were normal. Testing of Eustachian tube function revealed tubal stenosis. Video-oculography revealed a predominantly torsional nystagmus while the patient was in the lordotic position. Fistula signs were positive. High-resolution computed tomography (HRCT) of the temporal bone revealed a diagnosis of bilateral superior semicircular canal dehiscence (SCDS). Cervical vestibular-evoked myogenic potential (cVEMP) testing showed that the amplitude of the cVEMP measured from her left ear was larger than that from the right...
June 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/28635217/-the-exploration-on-optimization-of-two-alternatives-between-roll-test-and-dix-hallpike-test-in-benign-paroxysmal-positional-vertigo
#2
R Ji, T S Chen, W Wang, K X Xu, S S Li, C Wen, Q Liu, P Lin
Objective: To analyze the objective characteristics of roll test and Dix-Hallpike test in benign paroxysmal positional vertigo(BPPV)patients, discussing the premier solution of positional test. Methods: A total of 230 patients with BPPV, whereas 170 posterior semicircular canal canalithiasis (PSC-Can) BPPV and 60 horizontal semicircular canal canalithiasis (HSC-Can) BPPV were involved respectively. The induced nystagmus in roll test and Dix-Hallpike test was recorded by video nystagmuo graph (VNG), and the direction, intensity and time characteristics of nystagmus were compared in various BPPV...
June 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/28628917/anatomical-characteristics-of-facial-nerve-and-cochlea-interaction
#3
Nadine Schart-Morén, Sune Larsson, Helge Rask-Andersen, Hao Li
OBJECTIVE: The aim was to study the relationship between the labyrinthine portion (LP) of the facial canal and the cochlea in human inner ear molds and temporal bones using micro-CT and 3D rendering. A reduced cochlea-facial distance may spread electric currents from the cochlear implant to the LP and cause facial nerve stimulation. Influencing factors may be the topographic anatomy and otic capsule properties. METHODS: An archival collection of human temporal bones underwent micro-CT and 3D reconstruction...
June 20, 2017: Audiology & Neuro-otology
https://www.readbyqxmd.com/read/28628552/a-case-study-of-high-velocity-persistent-geotropic-nystagmus-is-this-bppv
#4
Michael C Schubert, Pamela M Dunlap, Susan L Whitney
BACKGROUND AND PURPOSE: Deciphering the cause for a persistent, direction-changing geotropic nystagmus can be difficult. Migraine and light cupula are two possible causes, though can be confused with benign paroxysmal positional vertigo (BPPV) affecting the horizontal semicircular canal. In migraine, the persistent geotropic nystagmus tends to be slow; in light cupula, the nystagmus has been illustrated to beat in the direction opposite that of prone positioning. CASE DESCRIPTION: Here we describe a patient with initial occurrence then recurrence of a high velocity (≥30 deg/sec), persistent direction-changing geotropic nystagmus and vertigo with an intensity variable based on head position, which was difficult to manage...
July 2017: Journal of Neurologic Physical Therapy: JNPT
https://www.readbyqxmd.com/read/28627985/diagnostic-performance-of-reformatted-isotropic-thin-section-helical-ct-images-in-the-detection-of-superior-semicircular-canal-dehiscence
#5
Gianvincenzo Sparacia, Alberto Iaia
Purpose The purpose of this article is to assess the diagnostic performance of computed tomography (CT) reformatted images for detection of superior semicircular canal (SSC) dehiscence. Material and methods Forty-two patients, with sound- and/or pressure-induced vestibular symptoms, and 42 control participants underwent helical CT examination with a highly collimated beam (0.5 mm). Reformatted images of the vestibular labyrinth were obtained in the standard axial and coronal planes (group A images), and in a plane parallel and perpendicular to the SSC (group B images)...
June 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28623066/association-of-posterior-semicircular-canal-hypofunction-on-video-head-impulse-testing-with-other-vestibulo-cochlear-deficits
#6
Alexander A Tarnutzer, Christopher J Bockisch, Elena Buffone, Konrad P Weber
OBJECTIVES: The video-head-impulse test (vHIT) provides a functional assessment of all six semicircular canals (SCC). Occasionally isolated loss of the posterior canal(s) (ILPC) is diagnosed, though this finding is poorly characterized. Here we assessed how accurate that diagnosis is by measuring the co-occurrence of abnormalities on caloric irrigation, vestibular-evoked myogenic-potentials and audiometry. METHODS: We identified 52 patients with ILPC (unilateral=40, bilateral=12)...
May 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28622893/outcomes-of-middle-fossa-craniotomy-for-the-repair-of-superior-semicircular-canal-dehiscence
#7
Nolan Ung, Lawrance K Chung, Carlito Lagman, Nikhilesh S Bhatt, Natalie E Barnette, Vera Ong, Quinton Gopen, Isaac Yang
Superior semicircular canal dehiscence (SSCD) is a rare defect of the arcuate eminence that causes an abnormal connection between the superior semicircular canal and middle cranial fossa. Patients often present with a variety of auditory and vestibular symptoms. Trigger avoidance is the initial strategy, but surgery may be necessary in debilitating cases. We retrospectively reviewed SSCD patients undergoing repair via a middle fossa craniotomy between March 2011 and September 2015. Forty-nine patients undergoing 58 surgeries were identified...
June 13, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28619840/does-3t-fetal-mri-improve-image-resolution-of-normal-brain-structures-between-20-and-24-weeks-gestational-age
#8
G Priego, N J Barrowman, J Hurteau-Miller, E Miller
BACKGROUND AND PURPOSE: Stronger magnetic fields have the potential to improve fetal image resolution. Our objective was to detect whether there was better anatomic resolution of brain structures in fetuses imaged with a 3T magnet compared with a 1.5T magnet. MATERIALS AND METHODS: Multiple cerebral and facial anatomic structures were retrospectively assessed in 28 fetal MR imaging scans with normal findings (12 at 3T and 16 at 1.5T) with a 0 -3 grading score. Fetuses were assessed during the second trimesters (gestational age, 20 -24 weeks)...
June 15, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28619435/video-head-impulse-test-can-detect-brainstem-dysfunction-in-multiple-sclerosis
#9
Ivan Pavlović, Berislav Ruška, Tin Pavičić, Magdalena Krbot Skorić, Luka Crnošija, Ivan Adamec, Mario Habek
BACKGROUND: The aim of this study was to investigate the potential role of video head impulse test (vHIT) in the detection of brainstem lesions in patients with multiple sclerosis (MS). METHODS: Sixty-eight participants were enrolled and divided into two groups: 39 healthy subjects (HC) (78 ears, 20 females, mean age 25,3±6,3) and 29 MS patients (58 ears, 14 females, mean age 33,7±7,7). Both groups underwent vHIT, and in MS group MRI was analyzed for the presence of brainstem lesions...
May 2017: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/28616773/intracochlear-schwannoma-tumor-removal-via-subtotal-cochleoectomy-and-partial-cochlear-reconstruction-with-preservation-of%C3%A2-semicircular-canal-function
#10
S K Plontke, S Kösling, N Pazaitis, T Rahne
We report about a patient, who in 2005, as a 37-year-old, experienced a sudden, mild to moderate, mid-frequency sensorineural hearing loss in the right ear, along with tinnitus and mild dizziness. MRI of the temporal bone revealed a very small (1 mm) enhancing lesion in the second turn of the right cochlea after injection of contrast medium. Hearing gradually deteriorated, with complete hearing loss in 2015. At this time, an MRI scan showed a lesion completely filling the cochlea.The tumor was removed through a subtotal cochleoectomy...
June 14, 2017: HNO
https://www.readbyqxmd.com/read/28614181/cochleovestibular-gene-transfer-in-neonatal-mice-by-canalostomy
#11
Jing-Ying Guo, Yu-Ying Liu, Teng-Fei Qu, Zhe Peng, Jing Xie, Guo-Peng Wang, Shu-Sheng Gong
Impairments of the inner ear result in sensorineural hearing loss and vestibular dysfunction in humans. A large proportion of these disorders are congenital, and involve both auditory and vestibular systems. Therefore, genetic interventions to correct deficits must be administered during early developmental stages. In this study, we evaluated inner ear gene transfer in neonatal mice by canalostomy using an adeno-associated virus serotype 8 (AAV8) vector. AAV8 with the green fluorescence protein (GFP) gene was inoculated into the inner ear of the neonatal mice through the posterior semicircular canal (canalostomy)...
June 13, 2017: Neuroreport
https://www.readbyqxmd.com/read/28611930/vestibular-derangement-and-motion-intolerance-in-vater-association
#12
Orit Samuel, Avi Shupak, Ayelet Eran, Dror Tal
VATER association is a nonrandom occurrence of congenital malformations: vertebral defects, anal atresia, tracheoesophageal fistula, renal defects, and radial bone anomalies. We report the case of a 19-year-old man with a childhood diagnosis of VATER association, who presented to the motion sickness clinic with severe seasickness. We discuss the clinical and laboratory diagnosis of vestibular pathophysiology, which was confirmed by MRI of lateral semicircular canal and vestibule dysplasia. We suggest the possibility of vestibular involvement as part of the developmental field defect associated with VATER syndrome, which hitherto has rarely been reported...
2017: Case Reports in Otolaryngology
https://www.readbyqxmd.com/read/28607891/cholesteatoma-induced-labyrinthine-fistula-is-aggressiveness-in-removing-disease-justified
#13
Prem Sagar, K Devaraja, Rajeev Kumar, Sumanth Bolu, Suresh C Sharma
Issues of complete disease clearance and hearing preservation in cholesteatoma induced labyrinthine fistula cases has been discussed and updated in this article. Successful disease clearance and hearing preservation in a case of cholesteatoma induced isolated cochlear promontory fistula encouraged us to retrospectively analyse 13 more cases of cholesteatoma induced labyrinthine fistula who presented in emergency service as complicated chronic suppurtive otitis media. Pre-operatively nine patients experienced vertigo, two had profound sensori neural hearing loss and radiology was suggestive of labyrinthine fistula in 12 patients...
June 2017: Indian Journal of Otolaryngology and Head and Neck Surgery
https://www.readbyqxmd.com/read/28607824/electrocochleography-summating-potential-seen-on-auditory-brainstem-response-in-a-case-of-superior-semicircular-canal-dehiscence
#14
Bryan K Ward, Angela Wenzel, Eva K Ritzl, John P Carey
BACKGROUND: Superior canal dehiscence syndrome (SCDS) is a condition in which an abnormal communication between the superior semicircular canal and the middle cranial fossa causes patients to hear internal noises transmitted loudly to their affected ear as well as to experience vertigo with pressure changes or loud sounds. Patients with SCDS can have an elevated ratio of summating potential (SP) to action potential (AP) as measured by electrocochleography (ECochG). Changes in this ratio have been observed during surgical intervention to correct this abnormal communication...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28606300/-benign-paroxysmal-positional-vertigo-treatment
#15
Niels West, Søren Hansen, Sune Land Bloch, Martin Nue Møller, Mads Klokker
Benign paroxysmal positional vertigo (BPPV) remains the most frequent cause of vertigo. The TRV chair is a mechanical device suited for optimization of managing complex cases of BPPV. Although the use of repositioning devices in the management of BPPV is increasing, no applicable guide for the TRV management of the different BPPV subtypes exists. This article presents the techniques for addressing canalolithiasis and cupulolithiasis in the TRV chair for each affected semicircular canal. In a tertiary referral centre like our unit the TRV chair is an asset in the management of BPPV...
June 5, 2017: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/28595652/effect-of-cochlear-implant-surgery-on-vestibular-function-meta-analysis-study
#16
REVIEW
Iman Ibrahim, Sabrina Daniela da Silva, Bernard Segal, Anthony Zeitouni
IMPORTANCE: Vestibular disorders have been reported following cochlear implant (CI) surgery, but the literature shows a wide discrepancy in the reported clinical impact. The aim of this meta-analysis is to quantify the effect of CI before and after surgery on the outcomes of vestibular tests, postural stability, and subjective perception of dizziness. OBJECTIVE: To evaluate the effects of CI surgery on vestibular function in adult patients (≥18 years) with sensorineural hearing loss who underwent unilateral or bilateral implantation...
June 8, 2017: Journal of Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/28576732/forskolin-and-protein-kinase-inhibitors-differentially-affect-hair-cell-potassium-currents-and-transmitter-release-at-the-cytoneural-junction-in-the-isolated-frog-labyrinth
#17
Maria Lisa Rossi, Gemma Rubbini, Marta Martini, Rita Canella, Riccardo Fesce
The post-transductional elaboration of sensory input at the frog semicircular canal has been studied by correlating the effects of drugs that interfere with phosphorylation processes on: (i) potassium conductances in isolated hair cell and (ii) transmitter release at the cytoneural junction in the intact labyrinth. At hair cells, delayed potassium currents (IKD) undergo voltage- and time-dependent inactivation; inactivation removal requires ATP, is sensitive to kinase blockade, but is unaffected by exogenous application of cyclic nucleotides...
May 31, 2017: Neuroscience
https://www.readbyqxmd.com/read/28576532/inner-ear-anomalies-in-children-with-isolated-unilateral-congenital-aural-atresia
#18
Tyler R Halle, Bruno P Soares, N Wendell Todd
OBJECTIVES/HYPOTHESIS: We aim to define the frequencies of anomalies of the inner ear, oval window, and round window ipsilateral to isolated non-syndromic unilateral aural atresia. METHODS AND MATERIALS: Retrospective case series. We reviewed high resolution computed tomography scans of the temporal bones of 70 children with isolated non-syndromic unilateral congenital aural atresia. Scans were reviewed according to the Jahrsdoerfer criteria and further evaluated for anomalies of the vestibule, semi-circular canals, cochlea, internal auditory canal and vestibulocochlear nerve...
April 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28573817/imaging-of-labyrinthine-fistula-after-repair-with-bone-pate
#19
Jeffrey T Vrabec
OBJECTIVES/HYPOTHESIS: To demonstrate imaging of labyrinthine fistula due to cholesteatoma and illustrate outcome following repair with bone pate. STUDY DESIGN: Retrospective review. METHODS: Patients with labyrinthine fistula due to cholesteatoma were identified, and pre- and postoperative imaging was assessed. Method of repair was recorded. The fistula site was examined for patency and bone density after repair. RESULTS: Twenty-nine fistulae were seen in a cohort of 375 cholesteatoma cases (8%)...
June 2, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28570420/semicircular-canal-pressure-changes-during-high-intensity-acoustic-stimulation
#20
Anne K Maxwell, Renee M Banakis Hartl, Nathaniel T Greene, Victor Benichoux, Jameson K Mattingly, Stephen P Cass, Daniel J Tollin
HYPOTHESIS: Acoustic stimulation generates measurable sound pressure levels in the semicircular canals. BACKGROUND: High-intensity acoustic stimuli can cause hearing loss and balance disruptions. To examine the propagation of acoustic stimuli to the vestibular end-organs, we simultaneously measured fluid pressure in the cochlea and semicircular canals during both air- and bone-conducted sound presentation. METHODS: Five full-cephalic human cadaveric heads were prepared bilaterally with a mastoidectomy and extended facial recess...
May 31, 2017: Otology & Neurotology
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