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https://www.readbyqxmd.com/read/29143209/the-medial-vestibular-nuclei-a-vulnerable-target-in-thiamine-deficiency
#1
Jorge C Kattah, Cindy Guede, Bahareh Hassanzadeh
BACKGROUND: Bilateral medial vestibular nuclei (MVN) is a common target in thiamine depletion and results in acute vestibular failure. Involvement of the MVN was present in 27 out of 38 brainstem sections reported in the largest thiamine deficiency autopsy cohort with Wernicke's encephalopathy. METHOD: Serial clinical, imaging and vestibulo-ocular reflex gain measured with the video head impulse (vHIT) in one patient with acute thiamine deficiency. RESULTS: Low horizontal VOR gain correlated with an abnormal manual head impulse and with MRI evidence of MVN in an alcohol-dependent patient with low thiamine levels...
November 15, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/29141478/utility-of-quick-oculomotor-tests-for-screening-the-vestibular-system-in-the-subacute-and-chronic-populations
#2
Helen S Cohen, Jasmine Stitz, Haleh Sangi-Haghpeykar, Susan P Williams, Ajitkumar P Mulavara, Brian T Peters, Jacob J Bloomberg
OBJECTIVE: The goal of this study was to determine the sensitivity and specificity of some widely used, easily administered clinical tests. BACKGROUND: Simple tests of oculomotor function have become widely used for clinical screening of patients suspected of having vestibular disorders despite a paucity of evidence showing good statistical support for their use in this highly variable population. METHODS: Healthy controls with no history of otologic or neurologic disorders (n = 291) were compared to patients with known vestibular disorders (n = 62)...
November 16, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/29135873/the-effect-of-peripheral-vestibular-recovery-on-improvements-in-vestibulo-ocular-reflexes-and-balance-control-after-acute-unilateral-peripheral-vestibular-loss
#3
John H J Allum, Alja Scheltinga, Flurin Honegger
BACKGROUND: Patients with an acute unilateral peripheral vestibular deficit (aUPVD), presumed to be caused by vestibular neuritis, show asymmetrical vestibular ocular reflexes (VORs) that improve over time. Questions arise regarding how much of the VOR improvement is due to peripheral recovery or central compensation, and whether differences in peripheral recovery influence balance control outcomes. METHODS: Thirty patients were examined at aUPVD onset and 3, 6, and 13 weeks later with four different VOR tests: caloric tests; rotating (ROT) chair tests performed in yaw with angular accelerations of 5 and 20 degrees/s; and video head impulse tests (vHIT) in the yaw plane...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29102239/comparison-of-the-video-head-impulse-test-with-the-caloric-test-in-patients-with-sub-acute-and-chronic-vestibular-disorders
#4
Anne Burston, Stuart Mossman, Benjamin Mossman, Mark Weatherall
The aim of this prospective register-based study was to compare video Head Impulse Tests (vHIT) with caloric tests on 173 patients assessed by a tertiary Neurology referral centre who had been referred for investigation of dizziness or vertigo and whose symptom duration was one month or longer. Abnormal vHIT was defined as angular velocity gain (peak eye velocity/peak head velocity) less than 0.79 at 80 ms and 0.75 at 60 ms, which was two standard deviations below our institutions' lower limit of normal; together with refixation saccades...
October 25, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29093698/the-role-of-predictability-in-saccadic-eye-responses-in-the-suppression-head-impulse-test-of-horizontal-semicircular-canal-function
#5
Jorge Rey-Martinez, Joaquin Yanes, Jonathan Esteban, Ricardo Sanz, Eduardo Martin-Sanz
Background: In the suppression head impulse paradigm (SHIMP) vHIT protocol, the participant is instructed to follow with his gaze a mobile target generated by a laser placed on the participant's head. Recent studies have reported that the refixation saccade latencies are in relation with the time evolution of the vestibular dysfunction in both (standard and SHIMP) procedures. We hypothesized that some central mechanisms like head impulse prediction could be one of the causes for the differences in the saccadic eye responses...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29089158/cerebellar-ataxia-with-neuropathy-and-vestibular-areflexia-syndrome-canvas
#6
Masakatsu Taki, Takashi Nakamura, Hiraku Matsuura, Tatsuhisa Hasegawa, Hirofumi Sakaguchi, Kanako Morita, Ryotaro Ishii, Ikuko Mizuta, Takashi Kasai, Toshiki Mizuno, Shigeru Hirano
Cerebellar ataxia with neuropathy and bilateral vestibular areflexia syndrome (CANVAS) is a novel ataxic disorder consisting of the triad of cerebellar impairment, bilateral vestibular hypofunction, and a somatosensory deficit. We report the first Japanese case of CANVAS. The patient is a 68-year-old Japanese male. He was referred to our university for further evaluation of progressive gait disturbance and ataxia. He exhibited horizontal gaze-evoked nystagmus and sensory deficit. Nerve conduction studies showed sensory neuronopathy...
October 28, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/29081427/clinical-and-video-head-impulse-test-in-the-diagnosis-of-posterior-circulation-stroke-presenting-as-acute-vestibular-syndrome-in%C3%A2-the-emergency-department
#7
Ayse Guler, Funda Karbek Akarca, Cenk Eraslan, Ceyda Tarhan, Cem Bilgen, Tayfun Kirazli, Nese Celebisoy
INTRODUCTION: Head impulse test (HIT) is the critical bedside examination which differentiates vestibular neuritis (VN) from posterior circulation stroke (PCS) in acute vestibular syndrome (AVS). Video-oculography based HIT (vHIT) may have aadditional strength in making the differentiation. METHODS: Patients admitted to the emergency department of a tertiary-care medical center with AVS were studied. An emergency specialist and a neurologist performed HIT. vHIT was conducted by an neuro-otology research fellow...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/29081426/bilateral-vestibulopathy-diagnostic-criteria-consensus-document-of-the-classification-committee-of-the-b%C3%A3-r%C3%A3-ny-society
#8
Michael Strupp, Ji-Soo Kim, Toshihisa Murofushi, Dominik Straumann, Joanna C Jen, Sally M Rosengren, Charles C Della Santina, Herman Kingma
This paper describes the diagnostic criteria for bilateral vestibulopathy (BVP) by the Classification Committee of the Bárány Society. The diagnosis of BVP is based on the patient history, bedside examination and laboratory evaluation. Bilateral vestibulopathy is a chronic vestibular syndrome which is characterized by unsteadiness when walking or standing, which worsen in darkness and/or on uneven ground, or during head motion. Additionally, patients may describe head or body movement-induced blurred vision or oscillopsia...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/29064828/differences-in-head-impulse-test-results-due-to-analysis-techniques
#9
Taylor W Cleworth, Mark G Carpenter, Flurin Honegger, John H J Allum
BACKGROUND: Different analysis techniques are used to define vestibulo-ocular reflex (VOR) gain between eye and head angular velocity during the video head impulse test (vHIT). Comparisons would aid selection of gain techniques best related to head impulse characteristics and promote standardisation. OBJECTIVE: Compare and contrast known methods of calculating vHIT VOR gain. METHODS: We examined lateral canal vHIT responses recorded from 20 patients twice within 13 weeks of acute unilateral peripheral vestibular deficit onset...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/29064825/development-of-a-new-software-and-test-setup-for-analyzing-hvor-in-very-young-children-by-vhit
#10
Angela Wenzel, Simon Eck, Kathrin Hülse, Karl Rohr, Karl Hörmann, Claudia Umbreit, Manfred Hülse, Roland Hülse
INTRODUCTION: Earlier work revealed that vHIT examination is often difficult to perform on very young children. In particular, the calibration of the system can be difficult, as active cooperation of the patient is required. Additionally, the patient must be able to follow the examiner's instructions, which is challenging for very young children. Therefore, the aim of the present study was to develop and validate a new, software-based approach enabling vHIT testing of young children and infants...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/29018402/preferential-impairment-of-the-contralesional-posterior-semicircular-canal-in-internuclear-ophthalmoplegia
#11
Seung-Han Lee, Sang-Hoon Kim, Sung-Sik Kim, Kyung Wook Kang, Alexander Andrea Tarnutzer
BACKGROUND: The vertical vestibulo-ocular reflex (VOR) may be impaired in internuclear ophthalmoplegia (INO) as the medial longitudinal fasciculus (MLF) conveys VOR-signals from the vertical semicircular canals. It has been proposed that signals from the contralesional posterior semicircular canal (PSC) are exclusively transmitted through the MLF, while for the contralesional anterior canal other pathways exist. OBJECTIVE: Here, we aimed to characterize dysfunction in individual canals in INO-patients using the video-head-impulse test (vHIT) and to test the hypothesis of dissociated vertical canal impairment in INO...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28985517/effect-of-common-antivertiginous-agents-on-the-high-velocity-vestibulo-ocular-reflex
#12
E Anagnostou, P Koutsoudaki, A Stavropoulos, I Evdokimidis
OBJECTIVE: It has long been suggested that antivertiginous medications exert their symptomatic effect through inhibition of the vestibulo-ocular reflex (VOR). We tested this hypothesis by directly measuring the VOR after administration of three agents from different substance classes: an antihistamine, a benzodiazepine and a calcium channel antagonist. METHODS: The gain and the variability of the high velocity VOR was assessed using video head impulses (vHIT) under the following conditions: baseline, after dimenhydrinate, after diazepam and after cinnarizine...
September 19, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28980782/-the-video-head-impulse-test-in-the-vertiginous-patient
#13
Lorry Duchoud, Raphaël Maire
The video Head Impulse Test (vHIT) is a new diagnostic device which, in clinical practice, can be used to evaluate the vestibular canal function in a fast and objective way by recording the movements of the eyes and the head. The medical literature makes it possible today to define the place of this device in the care of patients with vertigo.
October 4, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28972467/effects-of-device-on-video-head-impulse-test-vhit-gain
#14
Kristen L Janky, Jessie N Patterson, Neil T Shepard, Megan L A Thomas, Julie A Honaker
BACKGROUND: Numerous video head impulse test (vHIT) devices are available commercially; however, gain is not calculated uniformly. An evaluation of these devices/algorithms in healthy controls and patients with vestibular loss is necessary for comparing and synthesizing work that utilizes different devices and gain calculations. PURPOSE: Using three commercially available vHIT devices/algorithms, the purpose of the present study was to compare: (1) horizontal canal vHIT gain among devices/algorithms in normal control subjects; (2) the effects of age on vHIT gain for each device/algorithm in normal control subjects; and (3) the clinical performance of horizontal canal vHIT gain between devices/algorithms for differentiating normal versus abnormal vestibular function...
October 2017: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/28955674/vestibulo-ocular-reflex-abnormalities-in-posterior-semicircular-canal-benign-paroxysmal-positional-vertigo-a-pilot-study
#15
Tayyebe Fallahnezhad, Mansoureh Adel Ghahraman, Saeid Farahani, Reza Hoseinabadi, Shohreh Jalaie
INTRODUCTION: Benign paroxysmal positional vertigo (BPPV), involving the semicircular canals, is one of the most common diseases of the inner ear. The video head impulse test (vHIT) is a new test that examines the function of the canals. This study aimed to investigate the vestibulo-ocular reflex (VOR) gain, gain asymmetry and saccades after stimulating all six canals in patients definitively diagnosed with posterior semicircular canal BPPV (PSC-BPPV). MATERIALS AND METHODS: Twenty-nine unilateral PSC-BPPV patients with normal oculographic and caloric results were enrolled in this study...
September 2017: Iranian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/28939919/validity-of-wavelet-transforms-for-analysis-of-video-head-impulse-test-vhit-results
#16
Jorge Rey-Martinez
To explore the applicability of discrete wavelet transforms in the analysis of vHIT responses. Discrete wavelet transform was applied to vHIT responses and a new method for calculating aVOR gain was developed. A prospective study was performed with two groups of normal (N = 10) and altered (N = 19) gain values; HIMP and SHIMP vHIT protocols were performed on both groups. To evaluate the gain values obtained, Intraclass Correlation Index, Pearson's correlation, linear regression, and t test were performed...
December 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28936193/video-head-impulse-tests-with-a-remote-camera-system-normative-values-of-semicircular-canal-vestibulo-ocular-reflex-gain-in-infants-and-children
#17
Sylvette R Wiener-Vacher, Sidney I Wiener
The video head impulse test (VHIT) is widely used to identify semicircular canal function impairments in adults. But classical VHIT testing systems attach goggles tightly to the head, which is not tolerated by infants. Remote video detection of head and eye movements resolves this issue and, here, we report VHIT protocols and normative values for children. Vestibulo-ocular reflex (VOR) gain was measured for all canals of 303 healthy subjects, including 274 children (aged 2.6 months-15 years) and 26 adults (aged 16-67)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28895171/effect-of-aging-and-direction-of-impulse-in-video-head-impulse-test
#18
Tae Hwan Kim, Min-Beom Kim
OBJECTIVE: The aim of this study was to identify the difference of gain value in the video head impulse test (vHIT) according to the age of the patient and the direction of the impulse. METHOD: All participants were subjected to vHIT with horizontal semicircular canal (HSCC). vHIT with vertical canal (posterior and anterior semicircular canal [PSCC and ASCC]) additionally was performed in 434 participants. RESULTS: The mean vestibulo-ocular reflex (VOR) gain was maintained in patients in the HSCC at below 70 years (1...
September 12, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28862109/video-head-impulse-test-for-early-diagnosis-of-vestibular-neuritis-among-acute-vertigo
#19
Qiongfeng Guan, Lisan Zhang, Wenke Hong, Yi Yang, Zhaoying Chen, Peilin Lu, Dan Zhang, Xingyue Hu
BACKGROUND: This study assesses the value of the video head impulse test (vHIT) for early diagnosis of vestibular neuritis (VN) among acute vertigo. METHODS: Thirty-three cases of vestibular neuritis (VN), 96 patients with other acute vertigo (AV), and 50 cases of normal controls used vHIT to quantitatively test a pair of horizontal vestibulo-ocular reflection (VOR) gains, two pairs of vertical VOR gains, and the corresponding three pairs of VOR gain asymmetry. The peculiarity of VOR gains in VN and the differences between VN and other AV, normal controls by vHIT, were collected and analyzed...
September 2017: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
https://www.readbyqxmd.com/read/28807728/vestibulo-ocular-reflex-abnormality-in-parkinson-s-disease-detected-by-video-head-impulse-test
#20
Wen Lv, Qiongfeng Guan, Xingyue Hu, Jiaqi Chen, Hong Jiang, Lisan Zhang, Weinv Fan
BACKGROUND: Parkinson's disease (PD) is a common neurodegenerative disease characterized by dopaminergic neuronal loss. The underlying cause of PD is unknown. OBJECTIVE: To assess the clinical relevance of vestibular-ocular reflex (VOR) gain in patients with PD, especially those in the early stages. METHODS: Sixty-three PD patients and 56 control healthy individuals were enrolled in this study between Mar 2015 and Aug 2015. VOR gains were determined by video head impulse test (vHIT) device...
September 14, 2017: Neuroscience Letters
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