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https://www.readbyqxmd.com/read/28528135/presymptomatically-applied-ampa-receptor-antagonist-prevents-calcium-increase-in-vulnerable-type-of-motor-axon-terminals-of-mice-modeling-amyotrophic-lateral-sclerosis
#1
Roland Patai, Melinda Paizs, Massimo Tortarolo, Caterina Bendotti, Izabella Obál, József I Engelhardt, László Siklós
Increased intracellular calcium (Ca), which might be the consequence of an excess influx through Ca-permeable α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors, plays a crucial role in degeneration of motor neurons. Previously we demonstrated that the presymptomatic application of AMPA receptor antagonist, talampanel, could reduce Ca elevation in spinal motor neurons of mice carrying the G93A mutation of superoxide dismutase 1 (SOD1), modeling amyotrophic lateral sclerosis (ALS). It remained to be examined whether the remote, functionally semi-autonomous motor axon terminals could be rescued from the Ca overload, or if the terminals, where the degeneration possibly starts, already experience intractable changes at early time points...
May 17, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28524127/-an-acute-subdural-hematoma-caused-by-rupture-of-a-middle-cerebral-artery-aneurysm
#2
R S Dzhindzhikhadze, O N Dreval', V A Lazarev, R L Kambiev
Acute subdural hematoma caused by cerebral aneurysm rupture is rare. We describe a clinical case of an acute subdural hematoma developed due to rupture of an aneurysm at the M1 segment bifurcation of the middle cerebral artery (MCA). The acute subdural hematoma associated with intracranial hypertension and transtentorial herniation resulted in a comatose condition. The patient underwent decompressive craniectomy, hematoma removal, and clipping of the aneurysm. A significant improvement was observed in the postoperative period...
2017: Zhurnal Voprosy Neĭrokhirurgii Imeni N. N. Burdenko
https://www.readbyqxmd.com/read/28521519/improving-primary-care-provider-practices-in-youth-concussion-management
#3
Kristy B Arbogast, Allison E Curry, Kristina B Metzger, Ronni S Kessler, Jeneita M Bell, Juliet Haarbauer-Krupa, Mark R Zonfrillo, Matthew J Breiding, Christina L Master
Primary care providers are increasingly providing youth concussion care but report insufficient time and training, limiting adoption of best practices. We implemented a primary care-based intervention including an electronic health record-based clinical decision support tool ("SmartSet") and in-person training. We evaluated consequent improvement in 2 key concussion management practices: (1) performance of a vestibular oculomotor examination and (2) discussion of return-to-learn/return-to-play (RTL/RTP) guidelines...
May 1, 2017: Clinical Pediatrics
https://www.readbyqxmd.com/read/28521344/the-interlenticulostriate-approach-to-very-high-riding-distal-basilar-trunk-aneurysms
#4
Ralph Rahme, Almaz Kurbanov, Jeffrey T Keller, Todd A Abruzzo, Lincoln Jimenez, Andrew J Ringer, Ondrej Choutka, Mario Zuccarello
BACKGROUND: Most high-riding distal basilar trunk aneurysms can be surgically approached via the transsylvian route and its orbitozygomatic variant. However, on rare occasions, the basilar bifurcation may be unusually high and an approach above the carotid terminus may be required. OBJECTIVE: In this cadaveric study, we sought to determine the feasibility and exposure limits of the interlenticulostriate approach (ILSA). METHODS: A standard transsylvian approach was performed in 10 cerebral hemispheres of 5 formalin-fixed, silicone-injected cadaver heads...
June 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28520665/family-history-of-migraine-associated-with-posttraumatic-migraine-symptoms-following-sport-related-concussion
#5
Alicia Sufrinko, Jamie McAllister-Deitrick, R J Elbin, Michael W Collins, Anthony P Kontos
OBJECTIVE: To determine whether family history of migraine increased the likelihood of posttraumatic migraine (PTM) symptom presentation in adolescents following concussion, and examine the influence of family history of migraine and PTM on postinjury outcomes. SETTING: Outpatient concussion clinic. PARTICIPANTS: A total of 153 patients with concussion (103 males and 50 females) aged 15.72 ± 1.48 years (range 12-18 years). DESIGN: Cross-sectional, observational study of patients presenting for initial evaluation 4...
May 17, 2017: Journal of Head Trauma Rehabilitation
https://www.readbyqxmd.com/read/28516191/-unexpected-finding-in-a%C3%A2-case-of-oculomotor-nerve-paresis
#6
Fritz Schneider, Andreas Knopf, Herbert Stimmer, Benedikt Hofauer
No abstract text is available yet for this article.
May 17, 2017: HNO
https://www.readbyqxmd.com/read/28515286/responses-of-purkinje-cells-in-the-oculomotor-vermis-of-monkeys-during-smooth-pursuit-eye-movements-and-saccades-comparison-with-floccular-complex
#7
Ramanujan T Raghavan, Stephen G Lisberger
We recorded the responses of Purkinje cells in the oculomotor vermis during smooth pursuit and saccadic eye movements. Our goal was to characterize the responses in the vermis using approaches that would allow direct comparisons with responses of Purkinje cells in another cerebellar area for pursuit, the floccular complex. Simple-spike firing of vermis Purkinje cells is direction selective during both pursuit and saccades, but the preferred directions are sufficiently independent so that downstream circuits could decode signals to drive pursuit and saccades separately...
May 17, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28512503/massive-oculomotor-nerve-enlargement-a-case-of-presumed-schwannomatosis
#8
Laura Donaldson, Ryan Rebello, Amadeo Rodriguez
A 45-year-old man presented with a slowly progressive pupil-involving third nerve palsy. Magnetic resonance imaging (MRI) revealed a tubular lesion extending from the interpeduncular cistern through the cavernous sinus and into the left orbit where it branched into a superior and an inferior division, clearly outlining the anatomy of the third cranial nerve. Multiple other, less pronounced, enlarged cranial nerves were noted. The differential diagnosis included chronic inflammatory demyelinating polyneuropathy (CIDP), hereditary motor and sensory neuropathy (HMSN), neurofibromatosis (NF), and schwannomatosis...
June 2017: Neuro-ophthalmology
https://www.readbyqxmd.com/read/28510626/outcome-measures-for-clinical-trials-of-leber-congenital-amaurosis-caused-by-the-intronic-mutation-in-the-cep290-gene
#9
Samuel G Jacobson, Artur V Cideciyan, Alexander Sumaroka, Alejandro J Roman, Jason Charng, Monica Lu, Windy Choi, Rebecca Sheplock, Malgorzata Swider, Mychajlo S Kosyk, Sharon B Schwartz, Edwin M Stone, Gerald A Fishman
Purpose: To determine efficacy outcome measures for clinical trials of Leber congenital amaurosis (LCA) associated with a common intronic mutation in the CEP290 gene. Methods: CEP290-LCA patients (ages 5-48) with the intronic mutation (c.2991+1655A>G) were studied as a retrospective observational case series using clinical methods and with full-field sensitivity testing (FST), optical coherence tomography (OCT), autofluorescence imaging (NIR-RAFI), transient pupillary light reflex (TPLR), oculomotor control and instability (OCI), a mobility course, and a questionnaire (NEI-VFQ)...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28505662/asymmetries-between-convergence-and-divergence-reveal-tonic-vergence-is-dependent-upon-phasic-vergence-function
#10
Ian M Erkelens, William R Bobier
Horizontal vergence eye movements are controlled by two processes, phasic and slow-tonic. Slow-tonic responses are hypothesized to be stimulated by the faster, pulse-step neural output of the phasic system. This suggests that the general behavior of each system should be similar; however, this relationship has yet to be investigated directly. We characterize the relationship between phasic and tonic vergence by quantifying directional asymmetries in the response properties of each mechanism to the same disparity amplitudes...
May 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28503706/an-eye-tracker-controlled-cognitive-battery-overcoming-verbal-motor-limitations-in-als
#11
Barbara Poletti, Laura Carelli, Federica Solca, Annalisa Lafronza, Elisa Pedroli, Andrea Faini, Nicola Ticozzi, Andrea Ciammola, Paolo Meriggi, Pietro Cipresso, Dorothée Lulé, Albert C Ludolph, Giuseppe Riva, Vincenzo Silani
We assessed language, attention, executive, and social cognition abilities in a sample of patients with Amyotrophic Lateral Sclerosis (ALS) by means of a recently developed cognitive battery based on oculomotor control with eye-tracking (ET) technology. Twenty-one ALS patients and 21 age- and education-matched healthy subjects underwent the ET-based cognitive assessment, together with the standard cognitive screening tools [Frontal Assessment Battery (FAB); Montreal Cognitive Assessment (MoCA); and Digit Sequencing Task]...
May 13, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28499971/selective-reward-affects-the-rate-of-saccade-adaptation
#12
Yoshiko Kojima, Robijanto Soetedjo
In this study we tested whether a selective reward could affect the adaptation of saccadic eye movements in monkeys. We induced the adaptation of saccades by displacing the target of a horizontal saccade vertically as the eye moved toward it, thereby creating an apparent vertical dysmetria. The repeated upward target displacement caused the originally horizontal saccade to gradually deviate upward over the course of several hundred trials. We induced this directional adaptation in both right- and leftward saccades in every experiment (n=20)...
May 10, 2017: Neuroscience
https://www.readbyqxmd.com/read/28494496/sensitivity-to-binocular-disparity-is-reduced-by-mild-traumatic-brain-injury
#13
Gunnar Schmidtmann, Tatiana Ruiz, Alexandre Reynaud, Daniel P Spiegel, Maude Laguë-Beauvais, Robert F Hess, Reza Farivar
Purpose: The impairment of visual functions is one of the most common complaints following mild traumatic brain injury (mTBI). Traumatic brain injury-associated visual deficits include blurred vision, reading problems, and eye strain. In addition, previous studies have found evidence that TBI can diminish early cortical visual processing, particularly for second-order stimuli. We investigated whether cortical processing of binocular disparity is also affected by mTBI. Methods: In order to investigate the influence of mTBI on global stereopsis, we measured the quick Disparity Sensitivity Function (qDSF) in 22 patients with mTBI...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28493348/effect-of-eye-opening-on-single-unit-activity-and-local-field-potentials-in-the-subthalamic-nucleus
#14
Arun Chockalingam, Abigail Belasen, Nita Chen, Adolfo Ramirez-Zamora, Youngwon Youn, Paul Feustel, Meghan E Wilock, Damian S Shin, Julie G Pilitsis
BACKGROUND: Subthalamic nucleus deep brain stimulation (STN DBS) is an established treatment in Parkinson's disease (PD). We investigate the effect of eye opening on neuronal activity and local field potentials (LFPs) in the STN. METHODS: We prospectively enrolled 25 PD patients undergoing STN DBS in our institution. During DBS, single-unit activity (SUA) and LFPs were measured when eyes were open and closed. As movement is known to result in changes in LFPs, we tested response to eye opening in the presence and absence of movement...
May 10, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28490685/-ruptured-c2-aneurysm-of-the-internal-carotid-artery-with-ipsilateral-unruptured-giant-internal-carotid-artery-aneurysm-a-case-report
#15
Saya Ozaki, Hideo Tanaka, Shinya Fukumoto, Haruhisa Ichikawa, Shinji Onoue, Noriyuki Fumoto, Hajime Miyazaki, Kanehisa Kohno
A giant intracranial internal carotid artery(ICA)aneurysm is difficult to treat. We encountered a case with an unruptured giant intracranial ICA aneurysm with a ruptured C2 aneurysm of the ipsilateral ICA. In this case report, we describe how the treatment and review the literature. A 59-year-old man presented with sudden-onset headache and vomiting. He was diagnosed at a local neurosurgical unit as having a subarachnoid hemorrhage and admitted to our hospital. Cerebral angiogram revealed an unruptured giant ICA C3-4 aneurysm with a ruptured aneurysm of the ipsilateral ICA C2...
May 2017: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/28489211/endovascular-treatment-of-carotid-cavernous-vascular-lesions
#16
Guilherme Brasileiro DE Aguiar, João Miguel Silva, Aline Lariessy Paiva, Maurício Jory, Mario Luiz Conti, José Carlos Veiga
Objective: to evaluate the endovascular treatment of vascular lesions of the cavernous segment of the internal carotidartery (ICA) performed at our institution. Methods: we conducted a descriptive, retrospective and prospective study of patients with aneurysms of the cavernous portion of the ICA or with direct carotid-cavernous fistulas (dCCF) undergoing endovascular treatment. Results: we included 26 patients with intracavernous aneurysms and ten with dCCF...
January 2017: Revista do Colégio Brasileiro de Cirurgiões
https://www.readbyqxmd.com/read/28487626/continuous-auditory-feedback-of-eye-movements-an-exploratory-study-toward-improving-oculomotor-control
#17
Eric O Boyer, Arthur Portron, Frederic Bevilacqua, Jean Lorenceau
As eye movements are mostly automatic and overtly generated to attain visual goals, individuals have a poor metacognitive knowledge of their own eye movements. We present an exploratory study on the effects of real-time continuous auditory feedback generated by eye movements. We considered both a tracking task and a production task where smooth pursuit eye movements (SPEM) can be endogenously generated. In particular, we used a visual paradigm which enables to generate and control SPEM in the absence of a moving visual target...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28486231/decrease-of-horizontal-canal-vestibulo-oculomotor-reflex-gain-in-the-elderly-with-dysequilibrium-without-lifetime-vertigo
#18
Roberto Teggi, Matteo Trimarchi, Omar Gatti, Francesco Fornasari, Mario Bussi
BACKGROUND/AIMS: Unsteadiness in the elderly is a frequent complaint and a strong predictor of falls and psychological distress. Although there is a general consensus that it is a multifactorial condition, recent studies have focused on the role of aging of the vestibular system as a possible cofactor. The aim of our work was to assess horizontal canal function in the elderly. METHODS: We evaluated the gain of horizontal vestibulo-ocular reflex (VOR) with a video head impulse test on a sample of 58 subjects aged >70 years without lifetime episodes of vertigo and correlated the value with different clinical conditions (hypertension, diabetes, prior cardiovascular and vascular disorders of the central nervous system, and falls)...
May 10, 2017: ORL; Journal for Oto-rhino-laryngology and its related Specialties
https://www.readbyqxmd.com/read/28468998/rapid-accumulation-of-inhibition-accounts-for-saccades-curved-away-from-distractors
#19
Devin Heinze Kehoe, Mazyar Fallah
Saccades curved towards a distractor are accompanied by a burst of neuronal activation at the distractor locus in the intermediate layers of the superior colliculus (SCi) ~30 ms prior to the initiation of a saccade (McPeek et al., 2003; Port and Wurtz, 2003). Although saccades curve away from inactivated SCi loci (Aizawa and Wurtz, 1998), whether inhibition is restricted to a similar critical epoch for saccades curved away from a distractor remains unclear (White et al., 2012). We examined this possibility by modeling human saccade curvature as a function of the time between onset of a task irrelevant luminance- or color-modulated distractor and initiation of an impending saccade, referred to as saccade distractor onset asynchrony (SDOA)...
May 3, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28467418/a-kcnc3-mutation-causes-a-neurodevelopmental-non-progressive-sca13-subtype-associated-with-dominant-negative-effects-and-aberrant-egfr-trafficking
#20
Swati Khare, Jerelyn A Nick, Yalan Zhang, Kira Galeano, Brittany Butler, Habibeh Khoshbouei, Sruti Rayaprolu, Tyisha Hathorn, Laura P W Ranum, Lisa Smithson, Todd E Golde, Martin Paucar, Richard Morse, Michael Raff, Julie Simon, Magnus Nordenskjöld, Karin Wirdefeldt, Diego E Rincon-Limas, Jada Lewis, Leonard K Kaczmarek, Pedro Fernandez-Funez, Harry S Nick, Michael F Waters
The autosomal dominant spinocerebellar ataxias (SCAs) are a diverse group of neurological disorders anchored by the phenotypes of motor incoordination and cerebellar atrophy. Disease heterogeneity is appreciated through varying comorbidities: dysarthria, dysphagia, oculomotor and/or retinal abnormalities, motor neuron pathology, epilepsy, cognitive impairment, autonomic dysfunction, and psychiatric manifestations. Our study focuses on SCA13, which is caused by several allelic variants in the voltage-gated potassium channel KCNC3 (Kv3...
2017: PloS One
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