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vestibular movement disorders

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https://www.readbyqxmd.com/read/28194135/inaccurate-saccades-and-enhanced-vestibulo-ocular-reflex-suppression-during-combined-eye-head-movements-in-patients-with-chronic-neck-pain-possible-implications-for-cervical-vertigo
#1
Janine L Johnston, Pierre M Daye, Glen T D Thomson
BACKGROUND: The primate ocular motor system is designed to acquire peripheral targets of interest by coordinating visual, vestibular, and neck muscle activation signals. The vestibulo-ocular reflex (VOR) is greatly reduced at the onset of large eye-head (gaze) saccades and resumes before the end of the saccades to stabilize eye-in-orbit and ensure accurate target acquisition. Previous studies have relied on manipulating head movements in normal individuals to study VOR suppression and gaze kinematics...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28145840/geographic-variation-in-use-of-vestibular-testing-among-medicare-beneficiaries
#2
Meredith E Adams, Schelomo Marmor, Bevan Yueh, Robert L Kane
Objective There is a lack of consensus regarding the indications for vestibular testing in the evaluation of dizziness and balance disorders. Geographic variation in health services utilization is associated with lack of consensus. To understand the variation in current practice, we investigated the patterns of use of vestibular testing and diagnosis codes for dizziness and balance disorders among individuals ≥65 years of age across different regions of the United States. Study Design Cross-sectional study...
February 2017: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/28050212/otoneurological-abnormalities-in-patients-with-friedreich-s-ataxia
#3
Bianca Simone Zeigelboim, Juliana Cristina Mesti, Vinicius Ribas Fonseca, João Henrique Faryniuk, Jair Mendes Marques, Rafaella Cardosa Cardoso, Hélio Afonso Ghizoni Teive
Introduction Friedreich's ataxia is a neurodegenerative disease and progressive by nature. It has autosomal recessive inheritance and early onset in most cases. Nystagmus and hearing loss (in some cases) make up some of the common symptoms seen in this disorder. Objective The objective of this study is to examine vestibular disorders in patients with Friedreich ataxia. Methods We conducted a retrospective cross-sectional study. We evaluated 30 patients with ages ranging from six to 72 years (mean age of 38...
January 2017: International Archives of Otorhinolaryngology
https://www.readbyqxmd.com/read/27938621/-chronic-subjective-dizziness
#4
Y Lin, J L Wang, J H Qiu, D J Zha
Chronic subjective dizziness(CSD) was defined as persistent nonvertiginous dizziness or subjective unsteadiness. Patients are hypersensitivity to motion stimuli, such as head movement and motion of objects in the visual surrounding, and have difficulty with precise visual tasks. The concept of CSD was first proposed by Staab and Ruckenstein, which indicates relationships between chronic dizziness and acute vestibular or psychiatric disorders, including neuro-otologic type, psychiatric type or interactive type...
November 7, 2016: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/27703443/a-cross-sectional-survey-and-cross-sectional-clinical-trial-to-determine-the-prevalence-and-management-of-eye-movement-disorders-and-vestibular-dysfunction-in-post-stroke-patients-in-the-sub-acute-phase-protocol
#5
Andoret van Wyk, Carina A Eksteen, Piet J Becker, Barbara M Heinze
INTRODUCTION: Visual impairment, specifically eye movement disorders and vestibular dysfunction may have a negative influence on the functional recovery in post-stroke patients. This type of sensory dysfunction may further be associated with poor functional outcome in patients' post-stroke. METHODS: In phase 1, a cross-sectional survey (n = 100) will be conducted to determine the prevalence of eye movement disorders and vestibular dysfunction in patients who sustained a stroke...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27638066/eye-movements-in-vestibular-disorders
#6
REVIEW
A Kheradmand, A I Colpak, D S Zee
The differential diagnosis of patients with vestibular symptoms usually begins with the question: is the lesion central or is it peripheral? The answer commonly emerges from a careful examination of eye movements, especially when the lesion is located in otherwise clinically silent areas of the brain such as the vestibular portions of the cerebellum (flocculus, paraflocculus which is called the tonsils in humans, nodulus, and uvula) and the vestibular nuclei as well as immediately adjacent areas (the perihypoglossal nuclei and the paramedian nuclei and tracts)...
2016: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/27638061/neurotransmitters-in-the-vestibular-system
#7
REVIEW
C D Balaban
Neuronal networks that are linked to the peripheral vestibular system contribute to gravitoinertial sensation, balance control, eye movement control, and autonomic function. Ascending connections to the limbic system and cerebral cortex are also important for motion perception and threat recognition, and play a role in comorbid balance and anxiety disorders. The vestibular system also shows remarkable plasticity, termed vestibular compensation. Activity in these networks is regulated by an interaction between: (1) intrinsic neurotransmitters of the inner ear, vestibular nerve, and vestibular nuclei; (2) neurotransmitters associated with thalamocortical and limbic pathways that receive projections originating in the vestibular nuclei; and (3) locus coeruleus and raphe (serotonergic and nonserotonergic) projections that influence the latter components...
2016: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/27557808/the-role-of-visual-stimuli-on-standing-posture-in-children-with-bilateral-cerebral-palsy
#8
Cecilia Lidbeck, Åsa Bartonek, Priti Yadav, Kristina Tedroff, Per Åstrand, Kerstin Hellgren, Elena M Gutierrez-Farewik
BACKGROUND: In children with bilateral cerebral palsy (CP) maintaining a standing position can be difficult. The fundamental motor task of standing independently is achieved by an interaction between the visual, somatosensory, and vestibular systems. In CP, the motor disorders are commonly accompanied by sensory and perceptual disturbances. Our aims were to examine the influence of visual stimuli on standing posture in relation to standing ability. METHODS: Three dimensional motion analysis with surface electromyography was recorded to describe body position, body movement, and muscle activity during three standing tasks: in a self-selected position, while blindfolded, and during an attention-demanding task...
August 24, 2016: BMC Neurology
https://www.readbyqxmd.com/read/27552387/bilateral-vestibulopathy-aggravates-balance-and-gait-disturbances-in-sensory-ataxic-neuropathy-dysarthria-and-ophthalmoparesis-a-case-report
#9
Roeland B van Leeuwen, Bart W Smits, Richard J Rodenburg, Baziel G van Engelen
In patients with a triad of sensory ataxic neuropathy, dysarthria, and ophthalmoparesis (SANDO), the presenting features are mainly ataxia or ptosis. SANDO patients often have impaired balance and gait, which is not surprising considering the combination of sensory ataxic neuropathy, and additional symptoms like cerebellar ataxia and limb girdle weakness. We describe a SANDO patient who noticed an increasingly impaired balance and gait, without any dizziness. Neurological investigation revealed an external ophthalmeplegia and a cerebellar ataxia; the head impulse test was not reliable because of eye movement disorders...
September 2016: Journal of Clinical Neuromuscular Disease
https://www.readbyqxmd.com/read/27533944/the-role-of-trimetazidine-in-cardiovascular-disease-beyond-an-anti-anginal-agent
#10
REVIEW
Cian P McCarthy, Kieran V Mullins, David M Kerins
With evidence for efficacy in such diverse clinical settings such as stable coronary artery disease, reperfusion injury, and contrast-induced nephropathy, trimetazidine (TMZ) is novel among cardiovascular agents. In spite of this and almost half a century of clinical experience with the drug, it remains licensed only as an adjunct in the management of angina pectoris in patients who are inadequately controlled by or intolerant to first-line therapies. Although no single pharmacological mechanism has been hitherto universally accepted, TMZ is known to target deranged cellular energetics particularly in ischaemic myocardial tissue...
October 2016: European Heart Journal. Cardiovascular Pharmacotherapy
https://www.readbyqxmd.com/read/27392833/the-development-of-the-icf-vestibular-environmental-scale
#11
Susan L Whitney, Ahmad Alghadir, Alia Alghwiri, Kefah M Alshebber, Mohammed Alshehri, Joseph M Furman, Martin Mueller, Eva Grill
UNLABELLED: People with vestibular disorders report changes in symptoms based on their environment with many situations increasing their symptoms. The purpose of this paper was to utilize the International Classification of Functioning Disability and Health (ICF) from the World Health Organization (WHO) to describe common environmental triggers for dizziness in persons living with balance and vestibular disorders. A multi-centre cross-sectional study was conducted with four different centres on three different continents, including patients from the United States (Pittsburgh), Germany (Munich), Jordan (Amman) and Saudi Arabia (Riyadh)...
July 2, 2016: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/27385797/contribution-of-intravestibular-sensory-conflict-to-motion-sickness-and-dizziness-in-migraine-disorders
#12
Joanne Wang, Richard F Lewis
Migraine is associated with enhanced motion sickness susceptibility and can cause episodic vertigo [vestibular migraine (VM)], but the mechanisms relating migraine to these vestibular symptoms remain uncertain. We tested the hypothesis that the central integration of rotational cues (from the semicircular canals) and gravitational cues (from the otolith organs) is abnormal in migraine patients. A postrotational tilt paradigm generated a conflict between canal cues (which indicate the head is rotating) and otolith cues (which indicate the head is tilted and stationary), and eye movements were measured to quantify two behaviors that are thought to minimize this conflict: suppression and reorientation of the central angular velocity signal, evidenced by attenuation ("dumping") of the vestibuloocular reflex and shifting of the rotational axis of the vestibuloocular reflex toward the earth vertical...
October 1, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/27385658/vestibular-migraine-screening-in-a-migraine-diagnosed-patient-population-and-assessment-of-vestibulocochlear-function
#13
U Yollu, D U Uluduz, M Yilmaz, H M Yener, F Akil, B Kuzu, E Kara, D Hayir, D Ceylan, N Korkut
OBJECTIVE: The primary aim of this study is to do a vestibular migraine scan in a population of patients with migraine diagnosis using the most recent standardized diagnosis criterion which is International Classification of Headache Disorders (ICHD) 3 Beta and to identify the epidemiological data. The second part of the study involves performing several vestibulocochlear tests on patients who received vestibular migraine (VM) diagnosis to collect data that may be important for diagnostic purposes by comparing the patients with normal population when necessary...
July 6, 2016: Clinical Otolaryngology
https://www.readbyqxmd.com/read/27358321/vestibular-and-oculomotor-influences-on-visual-dependency
#14
R Edward Roberts, Mariane Da Silva Melo, Aazim A Siddiqui, Qadeer Arshad, Mitesh Patel
The degree to which a person relies on visual stimuli for spatial orientation is termed visual dependency (VD). VD is considered a perceptual trait or cognitive style influenced by psychological factors and mediated by central reweighting of the sensory inputs involved in spatial orientation. VD is often measured with the rod-and-disk test, in which participants align a central rod to the subjective visual vertical (SVV) in the presence of a background that is either stationary or rotating around the line of sight-dynamic SVV...
September 1, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/27272105/development-of-an-effective-therapy-and-objective-assessment-for-children-with-birth-injuries
#15
Ákos Jobbágy, Judit Schultheisz, Márk Horváth, Hanna Réfy Vraskóné
Sitting in a Huple, a patented hemisphere-like tool, permanently stimulates the vestibular system, thus improving the balancing ability of children with movement disorders. The Gézengúz Foundation for Children with Birth Injuries has been successfully applying this tool in therapy. By attaching x-Inertial Measurement Unit, a wireless three-dimensional orientation sensor, to the Huple, it can serve as an input peripheral for simple PC games. Children are thus motivated; they willingly perform balance training as well as participate in the game-like test...
December 2016: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/27220548/vestibulo-ocular-reflex-function-in-children-with-high-functioning-autism-spectrum-disorders
#16
Tana B Carson, Bradley J Wilkes, Kunal Patel, Jill L Pineda, Ji H Ko, Karl M Newell, James W Bodfish, Michael C Schubert, Krestin Radonovich, Keith D White, Mark H Lewis
Sensorimotor processing alterations are a growing focus in the assessment and treatment of Autism Spectrum Disorders (ASD). The rotational vestibulo-ocular reflex (rVOR), which functions to maintain stable vision during head movements, is a sensorimotor system that may be useful in understanding such alterations and their underlying neurobiology. In this study, we assessed post-rotary nystagmus elicited by continuous whole body rotation among children with high-functioning ASD and typically developing children...
May 25, 2016: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/27185559/multiple-time-courses-of-vestibular-set-point-adaptation-revealed-by-sustained-magnetic-field-stimulation-of-the-labyrinth
#17
Prem Jareonsettasin, Jorge Otero-Millan, Bryan K Ward, Dale C Roberts, Michael C Schubert, David S Zee
A major focus in neurobiology is how the brain adapts its motor behavior to changes in its internal and external environments [1, 2]. Much is known about adaptively optimizing the amplitude and direction of eye and limb movements, for example, but little is known about another essential form of learning, "set-point" adaptation. Set-point adaptation balances tonic activity so that reciprocally acting, agonist and antagonist muscles have a stable platform from which to launch accurate movements. Here, we use the vestibulo-ocular reflex-a simple behavior that stabilizes the position of the eye while the head is moving-to investigate how tonic activity is adapted toward a new set point to prevent eye drift when the head is still [3, 4]...
May 23, 2016: Current Biology: CB
https://www.readbyqxmd.com/read/27075643/eye-movement-and-vestibular-dysfunction-in-mitochondrial-a3243g-mutation
#18
Sung-Hee Kim, Ziyoda Abdulkhaevna Akbarkhodjaeva, Ileok Jung, Ji-Soo Kim
Studying eye movements and vestibular function would provide insights into brain networks that are vulnerable in mitochondrial disorders. We sought eye movement and vestibular abnormalities in three Korean patients with a mitochondrial A3243G point mutation. The patients suffered from vertigo and imbalance during the stroke-like and seizure episodes from lesions involving the posterior cerebral cortex, which were accompanied by bilateral saccadic hypermetria and horizontal gaze-evoked nystagmus. Furthermore, two patients showed bilateral impairments of the vestibulo-ocular reflex during head impulses for the horizontal and posterior canals on both sides in the absence of caloric paresis...
July 2016: Neurological Sciences
https://www.readbyqxmd.com/read/26934788/-vestibular-function-after-repeated-space-flights
#19
I A Naumov, L N Kornilova, D O Glukhikh, A S Pavlova, E V Khabarova, G A Ekimovsky, A V Vasin
Results of the vestibular function testing of 32 cosmonauts on return from repeated 125- to 215-day space flights (SF) on the International space station are presented. The cosmonauts were tested twice before flight (baseline data collection) and on days 1-2, 4-5 and 8-9 after landing. Electro- and video-oculography were used to register simultaneously eye and head movements. It was found that deadaptation following a repeated stay in long-duration SF takes statistically much shorter time. Most often, atypical vestibular disorders and changed patterns of the otolith-semicircular canal interaction are observed in cosmonauts who have made their maiden flights to microgravity...
2015: Aviakosmicheskaia i Ekologicheskaia Meditsina, Aerospace and Environmental Medicine
https://www.readbyqxmd.com/read/26918638/hippocampal-gray-matter-volume-in-bilateral-vestibular-failure
#20
Martin Göttlich, Nico M Jandl, Andreas Sprenger, Jann F Wojak, Thomas F Münte, Ulrike M Krämer, Christoph Helmchen
Bilateral vestibular failure (BVF) is a severe chronic disorder of the labyrinth or the eighth cranial nerve characterized by unsteadiness of gait and disabling oscillopsia during head movements. According to animal data, vestibular input to the hippocampus is proposed to contribute to spatial memory and spatial navigation. Except for one seminal study showing the association of impaired spatial navigation and hippocampal atrophy, patient data in BVF are lacking. Therefore, we performed a voxel-wise comparison of the hippocampal gray matter volume (GMV) in a clinically representative sample of 27 patients with incomplete BVF and 29 age- and gender-matched healthy controls to test the hypothesis of hippocampal atrophy in BVF...
May 2016: Human Brain Mapping
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