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https://www.readbyqxmd.com/read/29324449/toward-optimizing-vestibular-evoked-myogenic-potentials-normalization-reduces-the-need-for-strong-neck-muscle-contraction
#1
Kimberley S Noij, Barbara S Herrmann, Steven D Rauch, John J Guinan
BACKGROUND: The cervical vestibular evoked myogenic potential (cVEMP) represents an inhibitory reflex of the saccule measured in the ipsilateral sternocleidomastoid muscle (SCM) in response to acoustic or vibrational stimulation. Since the cVEMP is a modulation of SCM electromyographic (EMG) activity, cVEMP amplitude is proportional to muscle EMG amplitude. We sought to evaluate muscle contraction influences on cVEMP peak-to-peak amplitudes (VEMPpp), normalized cVEMP amplitudes (VEMPn), and inhibition depth (VEMPid)...
January 12, 2018: Audiology & Neuro-otology
https://www.readbyqxmd.com/read/29321511/enhancing-vestibular-function-in-the-elderly-with-imperceptible-electrical-stimulation
#2
Jorge M Serrador, Brian M Deegan, Maria C Geraghty, Scott J Wood
Age-related loss of vestibular function can result in decrements in gaze stabilization and increased fall risk in the elderly. This study was designed to see if low levels of electrical stochastic noise applied transcutaneously to the vestibular system can improve a gaze stabilization reflex in young and elderly subject groups. Ocular counter-rolling (OCR) using a video-based technique was obtained in 16 subjects during low frequency passive roll tilts. Consistent with previous studies, there was a significant reduction in OCR gains in the elderly compared to the young group...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29310507/inner-ear-test-battery-in-guinea-pig-models-a-review
#3
Yi-Ho Young
OBJECTIVE: This study reviewed the development of the inner ear test battery comprising auditory brainstem response (ABR), and caloric, ocular vestibular-evoked myogenic potential (oVEMP), and cervical vestibular-evoked myogenic potential (cVEMP) tests in guinea pig models at our laboratory over the last 20 years. Detailed description of the methodology for testing the small animals is also included. METHODS: Inner ear disorders, i.e. ototoxicity, noise exposure, or perilymph fistula were established in guinea pig models first...
January 8, 2018: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/29304173/the-reliability-of-nonlinear-least-squares-algorithm-for-data-analysis-of-neural-response-activity-during-sinusoidal-rotational-stimulation-in-semicircular-canal-neurons
#4
Pengyu Ren, Bowen Li, Shiyao Dong, Lin Chen, Yuelin Zhang
Although many mathematical methods were used to analyze the neural activity under sinusoidal stimulation within linear response range in vestibular system, the reliabilities of these methods are still not reported, especially in nonlinear response range. Here we chose nonlinear least-squares algorithm (NLSA) with sinusoidal model to analyze the neural response of semicircular canal neurons (SCNs) during sinusoidal rotational stimulation (SRS) over a nonlinear response range. Our aim was to acquire a reliable mathematical method for data analysis under SRS in vestibular system...
2018: PloS One
https://www.readbyqxmd.com/read/29298819/reduction-of-motion-sickness-through-targeting-histamine-n-methyltransferase-in-the-dorsal-vagal-complex-of-the-brain
#5
Miao-Miao Chen, Li-Hua Xu, Li Chang, Peng Yin, Zheng-Lin Jiang
To investigate the role of histamine N-methyltransferase (HNMT) activity in the development of motion sickness (MS) in the dorsal vagal complex (DVC) to inform the development of new drugs for MS, Beagle dogs and Sprague-Dawley rats were rotated to simulate MS. HNMT expression in the brain stem and DVC was measured. The effects of systemic application of tacrine, a HNMT inhibitor, on the development of MS were observed. Moreover, we microinjected a histamine receptor H1 inhibitor, promethazine, into the DVC to verify the involvement of histaminergic neurotransmission in MS...
January 3, 2018: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/29275134/comparative-safety-of-drugs-targeting-the-nitric-oxide-pathway-in-pulmonary-hypertension-a-mixed-approach-combining-a-meta-analysis-of-clinical-trials-and-a-disproportionality-analysis-from-the-who-pharmacovigilance-database
#6
C Khouri, M Lepelley, M Roustit, F Montastruc, M Humbert, J L Cracowski
BACKGROUND: Recent guidelines recommend riociguat, a soluble guanylate cyclase (sGC) stimulator, as well as the type 5 phosphodiesterase inhibitor (PDE5i) tadalafil or sildenafil as treatments for pulmonary arterial hypertension. We compared the safety profiles of sildenafil, tadalafil and riociguat in pulmonary hypertension. METHODS: We combined two approaches: First, we performed a meta-analysis of safety data extracted from randomized controlled trials. Secondly, we conducted a disproportionality analysis of data from VigiBase, the WHO global database of individual case safety reports, to compare the safety profiles with real life data...
December 21, 2017: Chest
https://www.readbyqxmd.com/read/29258928/predictive-value-of-intraoperative-facial-motor-evoked-potentials-in-vestibular-schwannoma-surgery-under-two-anesthesia-protocols
#7
Miao Ling, Xiaorong Tao, Siyuan Ma, Xiaocui Yang, Li Liu, Xing Fan, Guijun Jia, Hui Qiao
OBJECTIVE: To validate the feasibility of facial motor evoked potential (FMEP) in facial nerve (FN) monitoring during vestibular schwannoma (VS) surgery under two anesthesia protocols, and to examine its value for postoperative prognosis. METHODS: This prospective study included 106 patients with VS, who underwent microsurgical excision between May 2014 and November 2016 at the Beijing Tiantan Hospital, Capital Medical University, China. All patients were investigated for FMEP elicited by transcranial electrical stimulation in the contralateral facial motor cortex...
December 16, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29238670/specific-organ-targeted-vestibular-physiotherapy-the-pivot-in-the-contemporary-management-of-vertigo-and-imbalance
#8
EDITORIAL
Anirban Biswas, Bibhas Barui
Introduction: Advancements in our understanding of vestibular physiology and how it is changes in different diseases have established that of the three therapeutic approaches to treat disorders of the vestibular system viz. pharmacotherapy, surgery and physical therapy, it is the later i.e., physical therapy which is the most efficacious modality in the management of balance disorders. The futility of vestibular sedatives in the correction of vestibular disorders and in the restoration of balance and the very limited role of surgery has now been recognised...
December 2017: Indian Journal of Otolaryngology and Head and Neck Surgery
https://www.readbyqxmd.com/read/29227983/bone-conducted-vestibular-evoked-myogenic-potentials-before-and-after-stapes-surgery
#9
Kazuyuki Akazawa, Shigeto Ohta, Kenzo Tsuzuki, Masafumi Sakagami
OBJECTIVE: To identify whether stapes surgery causes otolith dysfunction using bone-conducted vestibular-evoked myogenic potentials (VEMPs). STUDY DESIGN: Prospective study. SETTING: Hyogo College of Medicine Hospital. PATIENTS: Twenty primary ears (19 otosclerosis, 1 congenital stapes fixation) in 17 patients (2 men, 15 women; mean age 51 yr, range 20-68 yr) who had normal cervical VEMP (cVEMP) and ocular VEMP (oVEMP) results with bone-conducted stimulation were included...
January 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29224460/implementation-of-rocking-chair-therapy-for-veterans-in-residential-substance-use-disorder-treatment-formula-see-text
#10
Rene' L Cross, Justin White, Jaclyn Engelsher, Stephen S O'Connor
BACKGROUND: Substance use disorder (SUD) and mental health diagnosis negatively affect Veteran homelessness. OBJECTIVE: Assess the acceptance and feasibility of rocking chair therapy as a self-implemented intervention for mood and substance cravings. PICOT: For homeless Veterans in SUD treatment, how does adding vestibular stimulation by use of a rocking chair compared with treatment as usual affect levels of anxiety and substance cravings? RESULTS: Two significant findings were observed...
December 1, 2017: Journal of the American Psychiatric Nurses Association
https://www.readbyqxmd.com/read/29222402/elmod1-stimulates-arf6-gtp-hydrolysis-to-stabilize-apical-structures-in-developing-vestibular-hair-cells
#11
Jocelyn F Krey, Rachel A Dumont, Philip A Wilmarth, Larry L David, Kenneth R Johnson, Peter G Barr-Gillespie
Sensory hair cells require control of physical properties of their apical plasma membranes for normal development and function. Members of the ARF small GTPase family regulate membrane trafficking and cytoskeletal assembly in many cells. We identified ELMOD1, a guanine nucleoside triphosphatase activating protein (GAP) for ARF6, as the most highly enriched ARF regulator in hair cells. To characterize ELMOD1 control of trafficking, we analyzed mice of both sexes from a strain lacking functional ELMOD1 (roundabout; rda)...
December 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29203800/cortical-organization-restored-by-cochlear-implantation-in-young-children-with-single-sided-deafness
#12
Melissa Jane Polonenko, Karen Ann Gordon, Sharon Lynn Cushing, Blake Croll Papsin
Early treatment of single sided deafness in children has been recommended to protect from neurodevelopmental preference for the better hearing ear and from social and educational deficits. A fairly homogeneous group of five young children (≤3.6 years of age) with normal right sided hearing who received a cochlear implant to treat deafness in their left ears were studied. Etiology of deafness was largely cytomegalovirus (n = 4); one child had an enlarged vestibular aqueduct. Multi-channel electroencephalography of cortical evoked activity was measured repeatedly over time at: 1) acute (0...
December 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29200999/confirming-a-role-for-%C3%AE-9nachrs-and-sk-potassium-channels-in-type-ii-hair-cells-of-the-turtle-posterior-crista
#13
Xiaorong Xu Parks, Donatella Contini, Paivi M Jordan, Joseph C Holt
In turtle posterior cristae, cholinergic vestibular efferent neurons (VENs) synapse on type II hair cells, bouton afferents innervating type II hair cells, and afferent calyces innervating type I hair cells. Electrical stimulation of VENs releases acetylcholine (ACh) at these synapses to exert diverse effects on afferent background discharge including rapid inhibition of bouton afferents and excitation of calyx-bearing afferents. Efferent-mediated inhibition is most pronounced in bouton afferents innervating type II hair cells near the torus, but becomes progressively smaller and briefer when moving longitudinally through the crista toward afferents innervating the planum...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29192857/knowledge-silos-assessing-knowledge-sharing-between-specialties-through-the-vestibular-schwannoma-literature
#14
Zane Schnurman, John G Golfinos, J Thomas Roland, Douglas Kondziolka
OBJECTIVE It is common for a medical disorder to be managed or researched by individuals who work within different specialties. It is known that both neurosurgeons and neurotologists manage vestibular schwannoma (VS) patients. While overlap in specialty focus has the potential to stimulate multidisciplinary collaboration and innovative thinking, there is a risk of specialties forming closed-communication loops, called knowledge silos, which may inhibit knowledge diffusion. This study quantitatively assessed knowledge sharing between neurosurgery and otolaryngology on the subject of VS...
December 1, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29190849/concussion-recovery-phase-affects-vestibular-and-oculomotor-symptom-provocation
#15
Kelly M Cheever, Jane McDevitt, Ryan Tierney, W Geoffrey Wright
Vestibular and oculomotor testing is emerging as a valuable assessment in sport-related concussion (SRC). However, their usefulness for tracking recovery and guiding return-to-play decisions remains unclear. Therefore the purpose of this study was to evaluate their clinical usefulness for tracking SRC recovery. Vestibular and oculomotor assessments were used to measure symptom provocation in an acute group (n=21) concussed≤10 days, prolonged symptoms group (n=10) concussed ≥16 days (median=84 days), healthy group (n=58) no concussions in >6 months...
November 30, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29189298/laboratory-examinations-for-the-vestibular-system
#16
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/29184530/the-video-head-impulse-test-to-assess-the-efficacy-of-vestibular-implants-in-humans
#17
Nils Guinand, Raymond Van de Berg, Samuel Cavuscens, Maurizio Ranieri, Erich Schneider, Floor Lucieer, Herman Kingma, Jean-Philippe Guyot, Angélica Pérez Fornos
The purpose of this study was to evaluate whether it is possible to restore the high-frequency angular vestibulo-ocular reflex (aVOR) in patients suffering from a severe bilateral vestibulopathy (BV) and implanted with a vestibular implant prototype. Three patients (S1-3) participated in the study. They received a prototype vestibular implant with one to three electrode branches implanted in the proximity of the ampullary branches of the vestibular nerve. Five electrodes were available for electrical stimulation: one implanted in proximity of the left posterior ampullary nerve in S1, one in the left lateral and another one in the superior ampullary nerves in S2, and one in the right lateral and another one in the superior ampullary nerves in S3...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29182659/fractal-analyses-reveal-independent-complexity-and-predictability-of-gait
#18
Frédéric Dierick, Anne-Laure Nivard, Olivier White, Fabien Buisseret
Locomotion is a natural task that has been assessed for decades and used as a proxy to highlight impairments of various origins. So far, most studies adopted classical linear analyses of spatio-temporal gait parameters. Here, we use more advanced, yet not less practical, non-linear techniques to analyse gait time series of healthy subjects. We aimed at finding more sensitive indexes related to spatio-temporal gait parameters than those previously used, with the hope to better identify abnormal locomotion. We analysed large-scale stride interval time series and mean step width in 34 participants while altering walking direction (forward vs...
2017: PloS One
https://www.readbyqxmd.com/read/29170018/ocular-torsion-responses-to-sinusoidal-electrical-vestibular-stimulation
#19
Stuart W Mackenzie, Raymond F Reynolds
BACKGROUND: Eye movements evoked by electrical vestibular stimulation (EVS) offer potential for diagnosing vestibular dysfunction. However, ocular recording techniques are often too invasive or impractical for routine clinical use. Furthermore, the kinematic nature of the EVS signal is not fully understood in terms of movement sensations. NEW METHOD: We apply sinusoidal EVS stimuli varying from 0.05 to 20Hz, and record the eye in darkness using an infrared camera...
November 20, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29169906/limits-on-normal-cochlear-third-windows-provided-by-previous-investigations-of-additional-sound-paths-into-and-out-of-the-cat-inner-ear
#20
John J Rosowski, Peter Bowers, Hideko H Nakajima
While most models of cochlear function assume the presence of only two windows into the mammalian cochlea (the oval and round windows), a position that is generally supported by several lines of data, there is evidence for additional sound paths into and out of the inner ear in normal mammals. In this report we review the existing evidence for and against the 'two-window' hypothesis. We then determine how existing data and inner-ear anatomy restrict transmission of sound through these additional sound pathways in cat by utilizing a well-tested model of the cat inner ear, together with anatomical descriptions of the cat cochlear and vestibular aqueducts (potential additional windows to the cochlea)...
November 10, 2017: Hearing Research
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