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https://www.readbyqxmd.com/read/29342047/direction-fixed-and-direction-changing-positional-nystagmus-in-ramsay-hunt-syndrome
#1
Chang-Hee Kim, Jin Woo Choi, Kyu Jin Han, Yong Sik Lee, Jung Eun Shin
OBJECTIVES: To investigate the incidence of positional nystagmus (PN) using a head-roll test in patients with Ramsay Hunt syndrome with vertigo (RHS_V) and discuss possible mechanisms. STUDY DESIGN: Retrospective study. SETTING: Tertiary referral academic medical center. PATIENTS: Twenty-eight patients with RHS_V were enrolled. MAIN OUTCOME MEASURE: Eye movements were recorded at positions of head roll to the right or left, and PN was classified as direction-fixed or direction-changing...
January 16, 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29337715/labyrinthine-sequestrum-a-case-report-and-review-of-the-literature
#2
Julie B Guerin, Diana L Vork, Lourdes Eguiguren, Alexander P Marston, Colin L W Driscoll, Matthew L Carlson, Nancy K Henry, John I Lane
OBJECTIVE: To report the presentation, diagnosis, management, and convalescence of labyrinthine sequestrum (LS) and summarize all previously published cases. PATIENT(S): Eleven-year-old female with LS. INTERVENTION(S): Multidisciplinary diagnostic evaluation and treatment. MAIN OUTCOME MEASURES: Imaging and laboratory findings, medical and surgical treatment. RESULTS: We describe a case of LS secondary to medically recalcitrant suppurative otitis media in an 11-year-old female and review all eight previously reported cases...
January 15, 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29335312/author-response-clinical-reasoning-labyrinthine-hemorrhage-an-unusual-etiology-for-peripheral-vertigo
#3
Simy K Parikh, Samuel A Frank
No abstract text is available yet for this article.
January 16, 2018: Neurology
https://www.readbyqxmd.com/read/29335311/reader-response-clinical-reasoning-labyrinthine-hemorrhage-an-unusual-etiology-for-peripheral-vertigo
#4
Luke Chen
No abstract text is available yet for this article.
January 16, 2018: Neurology
https://www.readbyqxmd.com/read/29335310/editors-note-clinical-reasoning-labyrinthine-hemorrhage-an-unusual-etiology-for-peripheral-vertigo
#5
Chafic Karam, Robert C Griggs
No abstract text is available yet for this article.
January 16, 2018: Neurology
https://www.readbyqxmd.com/read/29283914/cochlear-implantation-after-partial-or-subtotal-cochleoectomy-for-intracochlear-schwannoma-removal-a-technical-report
#6
Stefan K Plontke, Sabrina Kösling, Torsten Rahne
OBJECTIVE: To describe the technique for surgical tumor removal, cochlear implant (CI) electrode placement and reconstruction of the surgical defect in patients with intracochlear schwannomas. STUDY DESIGN: Retrospective case review. SETTING: Tertiary referral center. PATIENTS: Ten patients (five men, five women, mean age 48 ± 12 yr) with profound or severe to profound hearing loss due to intralabyrinthine schwannomas with intracochlear location...
December 27, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29273441/mri-screening-of-the-internal-auditory-canal-is-gadolinium-necessary-to-detect-intralabyrinthine-schwannomas
#7
Johnathan C Valesano, Carrie M Carr, Laurence J Eckel, Matthew L Carlson, John I Lane
OBJECTIVE: Non-contrast MRI of the internal auditory canal (IAC) using high-resolution T2WI (T2 weighted image) has been proposed as the primary screening study in patients with sudden or asymmetric sensorineural hearing loss (ASNHL). However, there are concerns that non-contrast MRI may not detect labyrinthine pathology, specifically intralabyrinthine schwannomas (ILSs). The purpose of this study was to determine if non-contrast high-resolution T2WI alone are adequate to exclude these uncommon intralabyrinthine tumors...
December 13, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/29258690/reliability-of-temporal-bone-high-resolution-ct-in-patients-with-facial-paralysis-in-temporal-bone-fracture
#8
Yuefeng Chen, Kai Zhang, Yanfeng Xu, Yanxu Che, Linna Guan, Yefeng Li
OBJECTIVE: This study aimed to investigate the reliability of temporal bone high-resolution CT (HRCT) in patients with traumatic facial paralysis. METHODS: HRCT with cross-sectional scanning and multi-planar reformation (MPR) was performed on 26 cases with traumatic facial paralysis, and the preoperative imaging manifestations were compared with surgical findings. RESULTS: Preoperative HRCT revealed fallopian canal damage at the posterior genu in 1 case, geniculate ganglion in 22 cases, labyrinthine segment in 4 cases, tympanic segment in 13 cases and mastoid segment in 0 case, while surgical findings confirmed fallopian canal damage at the posterior genu in 7 cases, geniculate ganglion in 23 cases, labyrinthine segment in 4 cases, tympanic segment in 17 cases and mastoid segment in 7 cases...
December 5, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/29189298/laboratory-examinations-for-the-vestibular-system
#9
Raymond van de Berg, Sally Rosengren, Herman Kingma
PURPOSE OF REVIEW: In the last decades, researchers suggested that clinical assessment of labyrinthine function in detail became easy thanks to video head impulse tests (VHITs), vestibular evoked myogenic potential test (VEMP) and video-oculography (VOG). It has been argued that they can replace electronystagmography, the caloric and rotatory chair tests. This review addresses the latest evaluations of these tests and the opportunities they offer, but also the limitations in clinical practice...
February 2018: Current Opinion in Neurology
https://www.readbyqxmd.com/read/29092804/bilateral-vestibular-hypofunction-in-quantitative-head-impulse-test-clinical-characteristics-in-23-patients
#10
Hilla Levo, Heikki Aalto, Timo P Hirvonen
OBJECTIVE: To explore clinical features of patients with bilateral vestibular hypofunction (BVH) verified in motorized head impulse test (MHIT). MATERIALS AND METHODS: We examined clinical records of 23 adult patients (10 males and 13 females), whose gain of the vestibulo-ocular reflex in the MHIT was bilaterally lowered. Fifteen of 62 unilateral cochlear implant (CI) recipients routinely tested both pre- and postoperatively with the MHIT had BVH. Eight of 198 vestibular outpatients selected to the MHIT due to clinical causes had BVH...
November 2, 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/29075933/the-dynamics-of-neural-fields-on-bounded-domains-an-interface-approach-for-dirichlet-boundary-conditions
#11
Aytül Gökçe, Daniele Avitabile, Stephen Coombes
Continuum neural field equations model the large-scale spatio-temporal dynamics of interacting neurons on a cortical surface. They have been extensively studied, both analytically and numerically, on bounded as well as unbounded domains. Neural field models do not require the specification of boundary conditions. Relatively little attention has been paid to the imposition of neural activity on the boundary, or to its role in inducing patterned states. Here we redress this imbalance by studying neural field models of Amari type (posed on one- and two-dimensional bounded domains) with Dirichlet boundary conditions...
October 26, 2017: Journal of Mathematical Neuroscience
https://www.readbyqxmd.com/read/29055686/the-role-of-explorative-tympanotomy-in-patients-with-sudden-sensorineural-hearing-loss-with-and-without-perilymphatic-fistula
#12
REVIEW
N K Prenzler, B Schwab, D M Kaplan, S El-Saied
PURPOSE: The purpose of this study was to describe the role of explorative tympanotomy in patients with Profound Sudden Sensorineural Hearing Loss (SSNHL) without clinical evidence of perilymphatic or labyrinthine fistula and to compare intraoperative findings with the postoperative hearing outcome. STUDY DESIGN: Retrospective study of all patients diagnosed with SSNHL who underwent explorative tympanotomy between 2002 and 2005. SETTINGS: Tertiary care university-affiliated hospital...
October 9, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28986167/nonlocal-grazing-in-patterned-ecosystems
#13
E Siero
Many ecosystems exhibit gapped, labyrinthine, striped or spotted patterns. Important examples are vegetation patterns in drylands: these patterns are viewed as precursors of a catastrophic transition to a degraded state. A possible source of degradation is overgrazing, but many current spatially extended models include grazing in a local linear way. In this article nonlocal grazing responses are derived, taking into account (1) how many consumers there are (demographic response) (2) where they are (aggregative response) and (3) how much they forage (functional response)...
January 7, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28977031/sudden-sensorineural-hearing-loss-associated-with-inner-ear-lesions-detected-by-magnetic-resonance-imaging
#14
Jiwon Cho, Hanjae Cheon, Jung Hye Park, Hyo-Jeong Lee, Hyung-Jong Kim, Hyo Geun Choi, Ja-Won Koo, Sung Kwang Hong
Although recent advances in magnetic resonance imaging (MRI) techniques have contributed to the detection of tiny lesions in the internal auditory canal (IAC) that may be responsible for sudden sensorineural hearing loss (SSNHL), there have been relatively few studies on the clinical characteristics of intra-labyrinthine hemorrhage (ILH) and labyrinthitis versus those regarding IAC tumors. Our purpose was to investigate the frequency of those IAC lesions on MRI and their clinical characteristics. Initial MRIs of 200 patients with SSNHL (93 men, 107 women; mean age = 48...
2017: PloS One
https://www.readbyqxmd.com/read/28966150/benchmarking-distance-control-and-virtual-drilling-for-lateral-skull-base-surgery
#15
Eduard H J Voormolen, Sander Diederen, Marijn van Stralen, Peter A Woerdeman, Herke Jan Noordmans, Max A Viergever, Luca Regli, Pierre A Robe, Jan Willem Berkelbach van der Sprenkel
BACKGROUND: Novel audiovisual feedback methods were developed to improve image guidance during skull base surgery by providing audiovisual warnings when the drill tip enters a protective perimeter set at a distance around anatomic structures ("distance control") and visualizing bone drilling ("virtual drilling"). OBJECTIVE: To benchmark the drill damage risk reduction provided by distance control, to quantify the accuracy of virtual drilling, and to investigate whether the proposed feedback methods are clinically feasible...
September 29, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28951912/experimental-and-theoretical-studies-on-the-morphogenesis-of-bacterial-biofilms
#16
Cheng Zhang, Bo Li, Jing-Ying Tang, Xiao-Ling Wang, Zhao Qin, Xi-Qiao Feng
Biofilm morphogenesis not only reflects the physiological state of bacteria but also serves as a strategy to sustain bacterial survival. In this paper, we take the Bacillus subtilis colony as a model system to explore the morphomechanics of growing biofilms confined in a defined geometry. We find that the growth-induced stresses may drive the occurrence of both surface wrinkling and interface delamination in the biofilm, leading to the formation of a labyrinthine network on its surface. The wrinkles are perpendicular to the boundary of the constraint region...
October 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/28947096/3d-constructive-interference-into-steady-state-3d-ciss-labyrinth-signal-alteration-in-patients-with-vestibular-schwannoma
#17
Franca Wagner, Evelyn Herrmann, Roland Wiest, Andreas Raabe, Corrado Bernasconi, Marco Caversaccio, Dominique Vibert
OBJECTIVE: To evaluate signal intensity of the inner ear using 3D-CISS imaging and correlated signal characteristics in patients with vestibular schwannoma to neuro-otological symptoms. METHODS: Sixty patients with unilateral vestibular schwannoma were retrospectively reviewed. All patients had had initial and follow-up magnetic resonance imaging (MRI). Individual treatment strategies consisted of "wait-and-watch", surgical tumour resection, stereotactic radiosurgery or both surgery and stereotactic radiosurgery...
September 22, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/28929059/incidence-of-facial-nerve-canal-dehiscence-in-primary-and-revision-cholesteatoma-surgery
#18
Mohammad Faramarzi, Sareh Roosta
The aim of this retrospective study was to determine the incidence of facial canal dehiscence (FCD) in primary and revision cholesteatoma surgery in a tertiary referral center. Moreover, our second goal was to identify association between FCD and other intra-operative pathological findings in a group of patients with cholesteatoma surgery. Inclusion criteria were primary and revision canal wall up and canal wall down tympanomastoidectomy in patients who suffers from chronic otitis media (COM) with cholesteatoma...
September 2017: Indian Journal of Otolaryngology and Head and Neck Surgery
https://www.readbyqxmd.com/read/28830539/endoscopically-assisted-transmastoid-approach-to-the-geniculate-ganglion-and-labyrinthine-facial-nerve
#19
Nicholas Jufas, Manohar Bance
BACKGROUND: Endoscopic transcanal approaches to the facial nerve allow excellent exposure of the tympanic facial nerve. This approach becomes limited when access is required to the more proximal geniculate ganglion and labyrinthine portion of the facial nerve. The aim of this report was to determine the feasibility of a transmastoid endoscopically assisted approach to the geniculate ganglion and labyrinthine facial nerve. This is an endoscopic cadaveric dissection and video review at a university anatomical laboratory...
August 22, 2017: Journal of Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/28826288/characteristic-mr-findings-suggesting-presumed-labyrinthine-hemorrhage
#20
Dong Sun Kim, Dong Woo Park, Tae Yoon Kim, Sangjoon Lee, Young Jun Lee, Ji Young Lee, Seung Hwan Lee, Jae Ho Chung
OBJECTIVES: To evaluate the magnetic resonance imaging (MRI) findings of labyrinthine hemorrhage as a cause of sudden sensorineural hearing loss (SSNHL). METHODS: MRI scans of 59 patients with SSNHL were retrospectively analyzed and compared to clinical features and audiometry data. MR images included pre-enhanced T1-weighted, 3D FLAIR volume isometric turbo spin-echo acquisition (VISTA), post-enhanced T1-weighted and 4-h-delayed enhanced FLAIR VISTA, and 3D thin-section proton density-weighted images...
December 2017: Acta Oto-laryngologica
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