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Video head impulse test

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https://www.readbyqxmd.com/read/27898608/effect-of-spatial-orientation-of-the-horizontal-semicircular-canal-on-the-vestibulo-ocular-reflex
#1
Rebecca Maxwell, Constantin von Kirschbaum, Claudia Jerin, Nadine Lehnen, Eike Krause, Robert Gürkov
OBJECTIVE: To determine if an alignment of the horizontal semi-circular canal (hSCC) with the plane of rotation would enhance the vestibular-ocular reflex (VOR) gain result as it has been previously suggested. STUDY DESIGN: Comparative study of a physiological vestibular function test in healthy subjects. SETTING: Tertiary referral center for otology and neurotology. PATIENTS: Twenty two healthy volunteers were recruited for this study...
November 24, 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27882914/propulsive-limb-coordination-and-body-acceleration-in-sprint-breaststroke-swimming
#2
Marek Strzała, Arkadiusz Stanula, Andrzej Ostrowski, Marcin Kaca, Piotr Kreżałek, Jacek Głodzik
BACKGROUND: This work is aimed at examining how coordination and kinematic indices interplay with swimming performance measured by average speed in 50m all-out test. METHODS: The group of 34 male competitive swimmers (19.1± 1.91 years old) participated in the study. The underwater movements of swimmers' bodies were recorded providing side- shots. Accelerations and angular velocity of pitch rotation of swimmer's sacrum were measured with inertial sensor device (three-axial accelerometer and gyroscope)...
November 24, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27814315/compensatory-saccades-in-head-impulse-testing-influence-the-dynamic-visual-acuity-of-patients-with-unilateral-peripheral-vestibulopathy1
#3
V G Wettstein, K P Weber, C J Bockisch, S C Hegemann
BACKGROUND: Both the dynamic visual acuity (DVA) test and the video head-impulse test (vHIT) are fast and simple ways to assess peripheral vestibulopathy. After losing peripheral vestibular function, some patients show better DVA performance than others, suggesting good compensatory mechanisms. It seems possible that compensatory covert saccades could be responsible for improved DVA. OBJECTIVE: To investigate VOR gain and compensatory saccades with vHIT and compare them to the DVA of patients with unilateral peripheral vestibulopathy...
November 3, 2016: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/27814312/impact-of-artifacts-on-vor-gain-measures-by-video-oculography-in-the-acute-vestibular-syndrome
#4
Georgios Mantokoudis, Ali S Saber Tehrani, Amy Wozniak, Karin Eibenberger, Jorge C Kattah, Cynthia I Guede, David S Zee, David E Newman-Toker
OBJECTIVE: The video head impulse test (HIT) measures vestibular function (vestibulo-ocular reflex [VOR] gain - ratio of eye to head movement), and, in principle, could be used to make a distinction between central and peripheral causes of vertigo. However, VOG recordings contain artifacts, so using unfiltered device data might bias the final diagnosis, limiting application in frontline healthcare settings such as the emergency department (ED). We sought to assess whether unfiltered data (containing artifacts) from a video-oculography (VOG) device have an impact on VOR gain measures in acute vestibular syndrome (AVS)...
November 3, 2016: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/27746761/vestibular-function-tests-for-vestibular-migraine-clinical-implication-of-video-head-impulse-and-caloric-tests
#5
Woo Seok Kang, Sang Hun Lee, Chan Joo Yang, Joong Ho Ahn, Jong Woo Chung, Hong Ju Park
Vestibular migraine (VM) is one of the most common causes of episodic vertigo. We reviewed the results of multiple vestibular function tests in a cohort of VM patients who were diagnosed with VM according to the diagnostic criteria of the Barany Society and the International Headache Society and assessed the efficacy of each for predicting the prognosis in VM patients. A retrospective chart analysis was performed on 81 VM patients at a tertiary care center from June 2014 to July 2015. Patients were assessed by the video head impulse test (vHIT), caloric test, vestibular-evoked myogenic potentials (VEMPs), and sensory organization test (SOT) at the initial visit and then evaluated for symptomatic improvement after 6 months...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27721805/saccadic-velocity-in-the-new-suppression-head-impulse-test-a-new-indicator-of-horizontal-vestibular-canal-paresis-and-of-vestibular-compensation
#6
Qiwen Shen, Christophe Magnani, Olivier Sterkers, Georges Lamas, Pierre-Paul Vidal, Julien Sadoun, Ian S Curthoys, Catherine de Waele
OBJECTIVE: To determine whether saccadic velocity in the suppression head impulse paradigm (SHIMP) test is a reliable indicator of vestibular loss at the acute and at the chronic stage in patients suffering from different vestibular pathologies. METHODS: Thirty-five normal subjects and 57 patients suffering from different vestibular pathologies associated with unilateral vestibular loss (UVL) or bilateral vestibular loss (BVL) were tested in the SHIMPs paradigm...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27694256/vestibular-neuritis-affects-both-superior-and-inferior-vestibular-nerves
#7
Rachael L Taylor, Leigh A McGarvie, Nicole Reid, Allison S Young, G Michael Halmagyi, Miriam S Welgampola
OBJECTIVE: To characterize the profiles of afferent dysfunction in a cross section of patients with acute vestibular neuritis using tests of otolith and semicircular canal function sensitive to each of the 5 vestibular end organs. METHODS: Forty-three patients fulfilling clinical criteria for acute vestibular neuritis were recruited between 2010 and 2016 and studied within 10 days of symptom onset. Otolith function was evaluated with air-conducted cervical and bone-conducted ocular/vestibular evoked myogenic potentials and the subjective visual horizontal test...
October 18, 2016: Neurology
https://www.readbyqxmd.com/read/27638075/bilateral-vestibulopathy
#8
M Strupp, K Feil, M Dieterich, T Brandt
The leading symptoms of bilateral vestibulopathy (BVP) are postural imbalance and unsteadiness of gait that worsens in darkness and on uneven ground. There are typically no symptoms while sitting or lying under static conditions. A minority of patients also have movement-induced oscillopsia, in particular while walking. The diagnosis of BVP is based on a bilaterally reduced or absent function of the vestibulo-ocular reflex (VOR). This deficit is diagnosed for the high-frequency range of the angular VOR by a bilaterally pathologic bedside head impulse test (HIT) and for the low-frequency range by a bilaterally reduced or absent caloric response...
2016: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/27638070/rotational-testing
#9
J M Furman
The natural stimulus for the semicircular canals is rotation of the head, which also might stimulate the otolith organs. Vestibular stimulation usually induces eye movements via the vestibulo-ocular reflex (VOR). The orientation of the subject with respect to the axis of rotation and the orientation of the axis of rotation with respect to gravity together determine which labyrinthine receptors are stimulated for particular motion trajectories. Rotational testing usually includes the measurement of eye movements via a video system but might use a subject's perception of motion...
2016: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/27632181/neuro-otology-some-recent-clinical-advances
#10
Miriam S Welgampola, Gülden Akdal, G Michael Halmagyi
Vestibular disorders manifesting as vertigo, chronic dizziness and imbalance are common problems in neurological practice. Here, we review some recent interesting and important advances in diagnosis of vestibular disorders using the video head impulse test and in the management of benign positional vertigo and migrainous vertigo.
September 15, 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27556420/adaptation-and-compensation-of-vestibular-responses-following-superior-canal-dehiscence-surgery
#11
Georgios Mantokoudis, Ali S Saber Tehrani, Aaron L Wong, Yuri Agrawal, Angela Wenzel, John P Carey
OBJECTIVE: To describe vestibulo-ocular function and compensatory mechanisms in the immediate postoperative period after superior canal dehiscence surgery. STUDY DESIGN: Prospective longitudinal study. SETTING: Tertiary medical center. PATIENTS: Five patients who underwent plugging of superior semicircular canal via middle cranial fossa approach. INTERVENTIONS: Bedside quantitative video head impulse testing (vHIT)...
October 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27545414/vestibular-neuritis-involvement-and-long-term-recovery-of-individual-semicircular-canals
#12
Bela Büki, Manuela Hanschek, Heinz Jünger
OBJECTIVE: In this retrospective study, the aim of the authors was to examine the frequency of involvement of the individual semicircular canals (SCCs) in vestibular neuritis (VN) and to assess the degree of long-term recovery. A secondary aim was to retrospectively determine the usefulness of a three-step bedside oculomotor test (the HINTS-test) for the differential diagnosis of peripheral VN. METHODS: 44 cases were evaluated during the acute phase and approximately two months later...
August 18, 2016: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/27544496/vestibular-function-in-patients-with-niemann-pick-type-c-disease
#13
Tatiana Bremova, Siegbert Krafczyk, Stanislavs Bardins, Jörg Reinke, Michael Strupp
We investigated whether vestibular dysfunction may cause or contribute to postural imbalance and falls in patients with Niemann-Pick type C disease (NP-C). Eight patients with NP-C disease and 20 healthy controls were examined using the video-based head impulse test (vHIT) and caloric irrigation to investigate horizontal canal function as well as ocular- and cervical vestibular evoked myogenic potentials (o- and cVEMP), and binocular subjective visual vertical estimation (SVV) for otolith function, and static posturography...
November 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27497382/preliminary-results-of-video-head-impulse-testing-vhit-in-children-with-cochlear-implants
#14
Nader Nassif, Cristiano Balzanelli, Luca Oscar Redaelli de Zinis
OBJECTIVE: To evaluate the lateral semicircular canal high frequency vestibulo-oculomotor reflex (LSC HF VOR) in children with cochlear implant. METHODS: 16 children (10 females and 6 males, age range = 5-17 years) receiving a unilateral (n = 12) or a bilateral (n = 4) cochlear implant were included and compared to a control group of 20 age-matched normal-hearing (NH) children. Both implanted and NH children received a vestibular function test battery, including a Vestibulo-Ocular Reflex (VOR) gain assessment by means of a video-Head Impulse Test (vHIT), which represented the main outcome measure...
September 2016: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/27486430/aging-increases-compensatory-saccade-amplitude-in-the-video-head-impulse-test
#15
Eric R Anson, Robin T Bigelow, John P Carey, Quan-Li Xue, Stephanie Studenski, Michael C Schubert, Konrad P Weber, Yuri Agrawal
OBJECTIVE: Rotational vestibular function declines with age resulting in saccades as a compensatory mechanism to improve impaired gaze stability. Small reductions in rotational vestibulo-ocular reflex (VOR) gain that would be considered clinically normal have been associated with compensatory saccades. We evaluated whether compensatory saccade characteristics varied as a function of age, independent of semicircular canal function as quantified by VOR gain. METHODS: Horizontal VOR gain was measured in 243 participants age 27-93 from the Baltimore Longitudinal Study of Aging using video head impulse testing...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27466890/vestibular-impairment-in-dementia
#16
Aisha Harun, Esther S Oh, Robin T Bigelow, Stephanie Studenski, Yuri Agrawal
OBJECTIVE: Recent studies suggest an association between vestibular and cognitive function. The goal of the study was to investigate whether vestibular function was impaired in individuals with mild cognitive impairment (MCI) and Alzheimer's disease (AD) compared with cognitively normal individuals. STUDY DESIGN: Cross-sectional study. SETTING: Outpatient memory clinic and longitudinal observational study unit. PATIENTS: Older individuals ≥55 years with MCI or AD...
September 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27445793/vor-gain-is-related-to-compensatory-saccades-in-healthy-older-adults
#17
Eric R Anson, Robin T Bigelow, John P Carey, Qian-Li Xue, Stephanie Studenski, Michael C Schubert, Yuri Agrawal
OBJECTIVE: Vestibulo-ocular reflex (VOR) gain is well-suited for identifying rotational vestibular dysfunction, but may miss partial progressive decline in age-related vestibular function. Since compensatory saccades might provide an alternative method for identifying subtle vestibular decline, we describe the relationship between VOR gain and compensatory saccades in healthy older adults. METHODS: Horizontal VOR gain was measured in 243 subjects age 60 and older from the Baltimore Longitudinal Study of Aging using video head impulse testing (HIT)...
2016: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/27435969/vertigo-with-sudden-hearing-loss-audio-vestibular-characteristics
#18
Jacob M Pogson, Rachael L Taylor, Allison S Young, Leigh A McGarvie, Sean Flanagan, G Michael Halmagyi, Miriam S Welgampola
Acute vertigo with sudden sensorineural hearing loss (SSNHL) is a rare clinical emergency. Here, we report the audio-vestibular test profiles of 27 subjects who presented with these symptoms. The vestibular test battery consisted of a three-dimensional video head impulse test (vHIT) of semicircular canal function and recording ocular and cervical vestibular-evoked myogenic potentials (oVEMP, cVEMP) to test otolith dysfunction. Unlike vestibular neuritis, where the horizontal and anterior canals with utricular function are more frequently impaired, 74 % of subjects with vertigo and SSNHL demonstrated impairment of the posterior canal gain (0...
October 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27417055/disease-specific-sparing-of-the-anterior-semicircular-canals-in-bilateral-vestibulopathy
#19
Alexander A Tarnutzer, Christopher J Bockisch, Elena Buffone, Stefan Weiler, Lucas M Bachmann, Konrad P Weber
OBJECTIVE: Bilateral vestibular loss (BVL) is often diagnosed with great delay and an underlying cause is only identified in 50-80%. We measured horizontal and vertical semicircular canal function using the video-head-impulse test (vHIT) and hypothesized that specific vHIT-patterns may be linked to certain etiologies. METHODS: We retrospectively analyzed 109 BVL-patients linked to aminoglycoside vestibulotoxicity (n=16), Menière's disease (n=10), infectious inner-ear disorders (n=11), sensorineural hearing-loss (n=11), cerebellar-ataxia-neuropathy-vestibular-areflexia-syndrome (CANVAS, n=5), other causes (n=19) as well as those with unknown origin (n=47)...
August 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27392837/vestibulo-ocular-reflex-dynamics-with%C3%A2-head-impulses-discriminates-spinocerebellar-ataxias-types-1-2-and-3-and%C3%A2-friedreich-ataxia
#20
L Luis, J Costa, E Muñoz, M de Carvalho, S Carmona, E Schneider, C R Gordon, J Valls-Solé
OBJECTIVE: Although the diagnosis of inherited ataxias is ultimately genetic, this usually means an extensive and expensive process. This justifies the search for distinct clinical signs that may potentially help orient molecular diagnosis. METHODS: We explored the vestibulo-ocular reflex (VOR) with the video Head Impulse Test in patients diagnosed with spinocerebellar ataxia (SCA) type 3 (n = 15), type 1 (n = 4) and type 2 (n = 4), Friedreich's ataxia (FA) (n = 9) and healthy controls (n = 40)...
July 2, 2016: Journal of Vestibular Research: Equilibrium & Orientation
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