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Head impulse test

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https://www.readbyqxmd.com/read/29018402/preferential-impairment-of-the-contralesional-posterior-semicircular-canal-in-internuclear-ophthalmoplegia
#1
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/29018011/balance-versus-hearing-after-cochlear-implant-in-an-adult
#2
Oz Zur, Hadas Ben-Rubi Shimron, Gerry Leisman, Eli Carmeli
The effect of vestibular rehabilitation (VR) on anxiety, dizziness and poor balance that developed after cochlear implant (CI) surgery is described. A 54-year-old woman, with profound hearing loss since the age of 2 years, underwent right CI surgery 2 years previously. On implant activation, the patient immediately felt dizziness and imbalance, which affected the ability to perform activities of daily living and increased anxiety to where the patient considered the CI removal. Prior to VR the patient was evaluated with the Dizziness Handicap Inventory and the Visual Vertigo Dizziness Questionnaire and clinically with the Zur Balance Scale and Video Head Impulse Test...
October 10, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28985517/effect-of-common-antivertiginous-agents-on-the-high-velocity-vestibulo-ocular-reflex
#3
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
#4
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/28980781/-inferior-vestibular-neuritis
#5
Stephen Jacques Alzuphar, Raphaël Maire
Inferior vestibular neuritis is a rare form of acute peripheral vestibular loss that only implies the lesion of the inferior vestibular nerve. The diagnosis is based on the observation of a spontaneous downbeating nystagmus, pathological head impulse test for the posterior semicircular canal and abnormal cervical vestibular-evoked myogenic potentials. Bithermal caloric testing and head impulse test for horizontal and anterior canals are normal, as well as the ocular vestibular-evoked myogenic potentials. The differential diagnosis of inferior vestibular neuritis includes the various central lesions that produce vertical down beating nystagmus (posterior fossa) and a cerebral magnetic resonance imaging is mandatory...
October 4, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28972467/effects-of-device-on-video-head-impulse-test-vhit-gain
#6
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
#7
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/28954005/sensitivity-of-caloric-test-and-video-head-impulse-as-screening-test-for-chronic-vestibular-complaints
#8
MULTICENTER STUDY
Raquel Mezzalira, Roseli Saraiva Moreira Bittar, Marcia Maria do Carmo Bilécki-Stipsky, Cibele Brugnera, Signe Schuster Grasel
OBJECTIVE: This study compared the results of the caloric test with those of the video head impulse test obtained during the same session and evaluated whether the former can be used to screen for non-acute vestibular dysfunction. METHODS: A total of 157 participants complaining of dizziness with vestibular characteristics of varying durations and clinical courses completed the caloric test and video head impulse test. RESULTS: Significantly more caloric test results than video head impulse test results were abnormal...
August 2017: Clinics
https://www.readbyqxmd.com/read/28948300/-preoperative-determination-of-nerve-of-origin-in-patients-with-vestibular-schwannoma-german-version
#9
T Rahne, S Plößl, S K Plontke, C Strauss
BACKGROUND: Vestibular schwannoma (VS) is a benign tumor that develops in the internal auditory canal and the cerebellopontine angle, potentially diminishing hearing or balance. Most VS tumors arise from one of two vestibular branches: the superior or inferior vestibular nerve. Determining the specific nerve of origin could improve patient management in terms of preoperative counseling, treatment selection, and surgical decision-making and planning. The aim of this study was to introduce a novel scoring system that was designed to determine the nerve of origin...
September 25, 2017: HNO
https://www.readbyqxmd.com/read/28939919/validity-of-wavelet-transforms-for-analysis-of-video-head-impulse-test-vhit-results
#10
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...
September 22, 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
#11
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
#12
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/28879396/vestibulo-ocular-reflex-deficits-with-medial-longitudinal-fasciculus-lesions
#13
Swee T Aw, Luke Chen, Michael J Todd, Michael H Barnett, G Michael Halmagyi
The medial longitudinal fasciculus (MLF) is the final common pathway for all conjugate adducting horizontal eye movements, as well as for the vertical-torsional vestibulo-ocular reflex (VOR). MLF lesion causes adduction paresis of ipsilesional (adducting) eye with dissociated nystagmus of contralesional (abducting) eye-the well-known clinical syndrome of internuclear ophthalmoplegia (INO). We measured the VOR stimulation and also any catch-up saccades, from individual semicircular canal (SCC) evoked by the head impulse test (HIT), using head and binocular 3-dimensional scleral search coils in 27 multiple sclerosis (MS) patients, 8 with unilateral, 19 with bilateral INO...
September 6, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28868046/a-novel-saccadic-strategy-revealed-by-suppression-head-impulse-testing-of-patients-with-bilateral-vestibular-loss
#14
Catherine de Waele, Qiwen Shen, Christophe Magnani, Ian S Curthoys
OBJECTIVE: We examined the eye movement response patterns of a group of patients with bilateral vestibular loss (BVL) during suppression head impulse testing. Some showed a new saccadic strategy that may have potential for explaining how patients use saccades to recover from vestibular loss. METHODS: Eight patients with severe BVL [vestibulo-ocular reflex (VOR) gains less than 0.35 and absent otolithic function] were tested. All patients were given the Dizziness Handicap Inventory and questioned about oscillopsia during abrupt head movements...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28862109/video-head-impulse-test-for-early-diagnosis-of-vestibular-neuritis-among-acute-vertigo
#15
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/28844105/the-floccular-syndrome-dynamic-changes-in-eye-movements-and-vestibulo-ocular-reflex-in-isolated-infarction-of-the-cerebellar-flocculus
#16
Dario Andres Yacovino, Manuel Perez Akly, Leonel Luis, David S Zee
The cerebellar flocculus is a critical structure involved in the control of eye movements. Both static and dynamic abnormalities of the vestibulo-ocular reflex (VOR) have been described in animals with experimental lesions of the flocculus/paraflocculus complex. In humans, lesions restricted to the flocculus are rare so they can become an exceptional model to contrast with the clinical features in experimental animals or in patients with more generalized cerebellar diseases. Here, we examined a 67-year-old patient with an acute vestibular syndrome due to an isolated infarct of the right flocculus...
August 26, 2017: Cerebellum
https://www.readbyqxmd.com/read/28807728/vestibulo-ocular-reflex-abnormality-in-parkinson-s-disease-detected-by-video-head-impulse-test
#17
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
https://www.readbyqxmd.com/read/28767521/disabling-central-paroxysmal-positioning-upbeat-nystagmus-and-vertigo-associated-with-the-presence-of-anti-glutamic-acid-decarboxylase-antibodies
#18
Ana I Martins, João N Carvalho, Ana M Amorim, Argemiro Geraldo, Eric Eggenberger, João Lemos
An immune attack by anti-glutamic acid decarboxylase (GAD) antibodies is believed to cause a deficiency in gamma-aminobutyric acid-mediated neurotransmission in the cerebellum. This, in turn, leads to several eye movement disorders, including spontaneous downbeat (DBN) and periodic alternating nystagmus. We describe a 68-year-old diabetic woman with disabling paroxysmal positioning upbeat nystagmus (UBN) exclusively in the supine position, associated with asymptomatic spontaneous DBN, alternating skew deviation and hyperactive vestibulo-ocular reflex responses on head impulse testing, in whom high titers of anti-GAD antibodies were detected...
August 1, 2017: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/28767033/bruns-nystagmus-and-positive-head-impulse-tests-in-platybasia
#19
Sung-Hee Kim, Mi-Ri Kang, Hyo-Jung Kim, Ji-Soo Kim
No abstract text is available yet for this article.
July 2017: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
https://www.readbyqxmd.com/read/28741403/comparative-study-between-the-caloric-vestibular-and-the-video-head-impulse-tests-in-unilateral-meni%C3%A3-re-s-disease
#20
Jonathan Andrés Cordero-Yanza, Edna Verónica Arrieta Vázquez, Juan Carlos Hernaiz Leonardo, Jimena Mancera Sánchez, Mario Sabas Hernández Palestina, Nicolás Pérez-Fernández
OBJECTIVE: Compare the caloric vestibular test (CVT) and the video head impulse test (vHIT) in the evaluation of Meniere's disease (MD) and to analyze their diagnostic accuracy. MATERIALS AND METHODS: Retrospective review of CVT and vHIT performed in MD patients at a tertiary care referral center in Spain. RESULTS: A total of 88 patients were reviewed. The CVT was abnormal in 67% (n = 59) of patients, while the vHIT was abnormal in 66% (n = 58) of them...
November 2017: Acta Oto-laryngologica
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