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Functional movement disorders

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https://www.readbyqxmd.com/read/28920067/a-history-of-dystonia-ancient-to-modern
#1
REVIEW
Rachel E Newby, Deborah E Thorpe, Peter A Kempster, Jane E Alty
Before 1911, when Hermann Oppenheim introduced the term dystonia, this movement disorder lacked a unifying descriptor. While words like epilepsy, apoplexy, and palsy have had their meanings since antiquity, references to dystonia are much harder to identify in historical documents. Torticollis is an exception, although there is difficulty distinguishing dystonic torticollis from congenital muscular torticollis. There are, nevertheless, possible representations of dystonia in literature and visual art from the pre-modern world...
July 2017: Movement Disorders Clinical Practice
https://www.readbyqxmd.com/read/28917252/stereotactic-radiosurgery-of-the-brain-a-review-of-common-indications
#2
Philip Gilbo, Isabella Zhang, Jonathan Knisely
Over the past half-century since Lars Leksell first utilized radiation to address deep and difficult to treat lesions of the central nervous system (CNS), intracranial stereotactic radiosurgery (SRS) has become an increasingly valued tool in the hands of neurosurgeons and radiation oncologists. Following developments in medical imaging and radiation technology, radiosurgery has evolved from its first application in movement disorders to widespread use for a varied range of malignant and benign conditions. SRS remains a powerful, minimally invasive instrument that offers additional options for intervention to a diverse patient population...
September 2017: Chinese Clinical Oncology
https://www.readbyqxmd.com/read/28914733/metabolic-connectivity-methods-and-applications
#3
Igor Yakushev, Alexander Drzezga, Christian Habeck
PURPOSE OF REVIEW: Metabolic connectivity modelling aims to detect functionally interacting brain regions based on PET recordings with the glucose analogue [F]fluorodeoxyglucose (FDG). Here, we outline the most popular metabolic connectivity methods and summarize recent applications in clinical and basic neuroscience. RECENT FINDINGS: Metabolic connectivity is modelled by various methods including a seed correlation, sparse inverse covariance estimation, independent component analysis and graph theory...
September 13, 2017: Current Opinion in Neurology
https://www.readbyqxmd.com/read/28913163/general-and-selective-brain-connectivity-alterations-in-essential-tremor-a-resting-state-fmri-study
#4
Karsten Mueller, Robert Jech, Martina Hoskovcová, Olga Ulmanová, Dušan Urgošík, Josef Vymazal, Evžen Růžička
Although essential tremor is the most common movement disorder, there is little knowledge about the pathophysiological mechanisms of this disease. Therefore, we explored brain connectivity based on slow spontaneous fluctuations of blood oxygenation level dependent (BOLD) signal in patients with essential tremor (ET). A cohort of 19 ET patients and 23 healthy individuals were scanned in resting condition using functional magnetic resonance imaging (fMRI). General connectivity was assessed by eigenvector centrality (EC) mapping...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28911048/what-can-different-motor-circuits-tell-us-about-psychosis-an-rdoc-perspective
#5
Vijay A Mittal, Jessica A Bernard, Georg Northoff
Signs of motor dysfunction are evidenced across a range of psychiatric disorders including schizophrenia. Historically, these features have been neglected but emerging theoretical and methodological advancements have shed new light on the utility of considering movement abnormalities. Indeed, the National Institute of Mental Health Research Domain Criteria initiative has recently met to develop a Motor Systems Domain. This reflects a growing appreciation for the enhanced reliability and validity that can come along with evaluating disturbances relevant to psychiatric illnesses from multiple levels of analysis, and conceptualizing these domains with respect to the complexity of their role in a broader integrated system (ie, weighing contributions and interactions between the cognitive, affective, and motor domains)...
September 1, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28906341/the-neurophysiology-of-paediatric-movement-disorders
#6
Verity M McClelland
PURPOSE OF REVIEW: To demonstrate how neurophysiological tools have advanced our understanding of the pathophysiology of paediatric movement disorders, and of neuroplasticity in the developing brain. RECENT FINDINGS: Delineation of corticospinal tract connectivity using transcranial magnetic stimulation (TMS) is being investigated as a potential biomarker for response to therapy. TMS measures of cortical excitability and neuroplasticity are also being used to investigate the effects of therapy, demonstrating neuroplastic changes that relate to functional improvements...
September 12, 2017: Current Opinion in Pediatrics
https://www.readbyqxmd.com/read/28906031/design-optimization-for-clinical-trials-in-early-stage-manifest-huntington-s-disease
#7
Chris Frost, Amy Mulick, Rachael I Scahill, Gail Owen, Elizabeth Aylward, Blair R Leavitt, Alexandra Durr, Raymund A C Roos, Beth Borowsky, Julie C Stout, Ralf Reilmann, Douglas R Langbehn, Sarah J Tabrizi, Cristina Sampaio
OBJECTIVES: The purpose of this study was to inform the design of randomized clinical trials in early-stage manifest Huntington's disease through analysis of longitudinal data from TRACK-Huntington's Disease (TRACK-HD), a multicenter observational study. METHODS: We compute sample sizes required for trials with candidate clinical, functional, and imaging outcomes, whose aims are to reduce rates of change. The calculations use a 2-stage approach: first using linear mixed models to estimate mean rates of change and components of variability from TRACK-HD data and second using these to predict sample sizes for a range of trial designs...
September 14, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28904337/toxoplasma-modulates-signature-pathways-of-human-epilepsy-neurodegeneration-cancer
#8
Huân M Ngô, Ying Zhou, Hernan Lorenzi, Kai Wang, Taek-Kyun Kim, Yong Zhou, Kamal El Bissati, Ernest Mui, Laura Fraczek, Seesandra V Rajagopala, Craig W Roberts, Fiona L Henriquez, Alexandre Montpetit, Jenefer M Blackwell, Sarra E Jamieson, Kelsey Wheeler, Ian J Begeman, Carlos Naranjo-Galvis, Ney Alliey-Rodriguez, Roderick G Davis, Liliana Soroceanu, Charles Cobbs, Dennis A Steindler, Kenneth Boyer, A Gwendolyn Noble, Charles N Swisher, Peter T Heydemann, Peter Rabiah, Shawn Withers, Patricia Soteropoulos, Leroy Hood, Rima McLeod
One third of humans are infected lifelong with the brain-dwelling, protozoan parasite, Toxoplasma gondii. Approximately fifteen million of these have congenital toxoplasmosis. Although neurobehavioral disease is associated with seropositivity, causality is unproven. To better understand what this parasite does to human brains, we performed a comprehensive systems analysis of the infected brain: We identified susceptibility genes for congenital toxoplasmosis in our cohort of infected humans and found these genes are expressed in human brain...
September 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28903042/distortion-of-the-actin-a-triad-results-in-contractile-disinhibition-and-cardiomyopathy
#9
Meera C Viswanathan, William Schmidt, Michael J Rynkiewicz, Karuna Agarwal, Jian Gao, Joseph Katz, William Lehman, Anthony Cammarato
Striated muscle contraction is regulated by the movement of tropomyosin over the thin filament surface, which blocks or exposes myosin binding sites on actin. Findings suggest that electrostatic contacts, particularly those between K326, K328, and R147 on actin and tropomyosin, establish an energetically favorable F-actin-tropomyosin configuration, with tropomyosin positioned in a location that impedes actomyosin associations and promotes relaxation. Here, we provide data that directly support a vital role for these actin residues, termed the A-triad, in tropomyosin positioning in intact functioning muscle...
September 12, 2017: Cell Reports
https://www.readbyqxmd.com/read/28901627/microstructural-white-matter-alterations-in-patients-with-drug-induced-parkinsonism
#10
Yoonju Lee, Yong Ho Choi, Jae Jung Lee, Hye Sun Lee, Young H Sohn, Jong-Min Lee, Phil Hyu Lee
Drug-induced parkinsonism (DIP) is the second most common etiology of parkinsonism. And yet, there is little information on structural imaging in DIP to elucidate the accurate underlying pathomechanisms. To investigate microstructural white matter (WM) in patients with DIP using diffusion tensor image and to determine its relationship to severity of parkinsonian motor symptoms and cognitive function. A total of 42 patients with DIP, 65 with Parkinson's disease, and 33 control subjects were recruited from a movement disorders outpatient clinic...
September 12, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28900413/impaired-cerebellum-to-primary-motor-cortex-associative-plasticity-in-parkinson-s-disease-and-spinocerebellar-ataxia-type-3
#11
Ming-Kuei Lu, Jui-Cheng Chen, Chun-Ming Chen, Jeng-Ren Duann, Ulf Ziemann, Chon-Haw Tsai
BACKGROUND: Functional perturbation of the cerebellum (CB)-motor cortex (M1) interactions may underlie pathophysiology of movement disorders, such as Parkinson's disease (PD) and spinocerebellar ataxia type 3 (SCA3). Recently, M1 motor excitability can be bidirectionally modulated in young subjects by corticocortical paired associative stimulation (PAS) on CB and contralateral M1 with transcranial magnetic stimulation (TMS), probably through the cerebello-dentato-thalamo-cortical (CDTC) circuit...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28899525/restless-legs-syndrome-after-high-risk-tia-and-minor-stroke-association-with-reduced-quality-of-life
#12
Mark I Boulos, Anthony Wan, Sandra E Black, Andrew S Lim, Richard H Swartz, Brian J Murray
BACKGROUND: Restless legs syndrome (RLS) is a movement disorder that is associated with poor quality of life and depressive symptoms in the general population. Emerging evidence suggests that RLS is closely associated with cerebrovascular disease. We assessed the effect of RLS on quality of life after stroke and transient ischemic attack (TIA). METHODS: In this single-center prospective study, we recruited patients within 14 days of high-risk TIA or minor stroke...
September 2017: Sleep Medicine
https://www.readbyqxmd.com/read/28898569/altered-task-related-modulation-of-long-range-connectivity-in-children-with-autism
#13
Ajay S Pillai, Danielle McAuliffe, Balaji M Lakshmanan, Stewart H Mostofsky, Nathan E Crone, Joshua B Ewen
Functional connectivity differences between children with autism spectrum disorder (ASD) and typically developing children have been described in multiple datasets. However, few studies examine the task-related changes in connectivity in disorder-relevant behavioral paradigms. In this paper, we examined the task-related changes in functional connectivity using EEG and a movement-based paradigm that has behavioral relevance to ASD. Resting-state studies motivated our hypothesis that children with ASD would show a decreased magnitude of functional connectivity during the performance of a motor-control task...
September 12, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28894610/maturation-refinement-and-serotonergic-modulation-of-cerebellar-cortical-circuits-in-normal-development-and-in-murine-models-of-autism
#14
REVIEW
Eriola Hoxha, Pellegrino Lippiello, Bibiana Scelfo, Filippo Tempia, Mirella Ghirardi, Maria Concetta Miniaci
The formation of the complex cerebellar cortical circuits follows different phases, with initial synaptogenesis and subsequent processes of refinement guided by a variety of mechanisms. The regularity of the cellular and synaptic organization of the cerebellar cortex allowed detailed studies of the structural plasticity mechanisms underlying the formation of new synapses and retraction of redundant ones. For the attainment of the monoinnervation of the Purkinje cell by a single climbing fiber, several signals are involved, including electrical activity, contact signals, homosynaptic and heterosynaptic interaction, calcium transients, postsynaptic receptors, and transduction pathways...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/28894393/review-of-rifaximin-latest-treatment-frontier-for-irritable-bowel-syndrome-mechanism-of-action-and-clinical-profile
#15
Kamesh Gupta, Harparam Singh Ghuman, Shivani Vijay Handa
BACKGROUND: Irritable bowel syndrome is classified as a functional gastrointestinal disorder with the primary symptom of abdominal pain in conjunction with bloating and bowel movement disorder. It affects up to 15% of the world's population. Among its subtypes, the most common is diarrhoea predominant. However, the current treatment options for diarrhoea-predominant irritable bowel syndrome have had not very promising results; most, such as antispasmodics, only provide partial symptomatic relief...
2017: Clinical Medicine Insights. Gastroenterology
https://www.readbyqxmd.com/read/28892082/myofibril-contraction-and-crosslinking-drive-nuclear-movement-to-the-periphery-of-skeletal-muscle
#16
William Roman, João P Martins, Filomena A Carvalho, Raphael Voituriez, Jasmine V G Abella, Nuno C Santos, Bruno Cadot, Michael Way, Edgar R Gomes
Nuclear movements are important for multiple cellular functions, and are driven by polarized forces generated by motor proteins and the cytoskeleton. During skeletal myofibre formation or regeneration, nuclei move from the centre to the periphery of the myofibre for proper muscle function. Centrally located nuclei are also found in different muscle disorders. Using theoretical and experimental approaches, we demonstrate that nuclear movement to the periphery of myofibres is mediated by centripetal forces around the nucleus...
September 11, 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28890690/a-cohesive-framework-for-motor-stereotypy-in-typical-and-atypical-development-the-role-of-sensorimotor-integration
#17
Robin L Shafer, Karl M Newell, Mark H Lewis, James W Bodfish
Stereotyped motor behavior manifests as rhythmic, repetitive movements. It is common in several neurologic and psychiatric disorders where it is considered maladaptive. However, it also occurs early in typical development where it serves an adaptive function in the development of complex, controlled motor behavior. Currently, no framework accounts for both adaptive and maladaptive forms of motor stereotypy. We propose a conceptual model that implicates sensorimotor mechanisms in the phenomenology of adaptive and maladaptive stereotypy...
2017: Frontiers in Integrative Neuroscience
https://www.readbyqxmd.com/read/28890381/the-link-between-parkinson-s-disease-and-rapid-eye-movement-sleep-behavior-disorder-with-dream-enactment-possible-implications-for-early-rehabilitation
#18
Brian P Johnson, Kelly P Westlake
The purpose of this paper is twofold. First, to inform readers of the link between the loss of motor inhibition during rapid eye movement (REM) sleep dreaming, diagnosed as REM sleep behavior disorder (RBD), and the future onset of neurodegenerative disorders, such as Parkinson's Disease and dementia with lewy bodies. It has been reported that motor disinhibition during rapid eye movement sleep often precedes onset of these disorders by years or even decades. Second, to consider that identification of RBD and the early involvement of rehabilitation and/or development of home exercise plans may aid in prolonging and even increasing function, independence, and quality of life should such neurodegenerative disorders develop later in life...
September 7, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28889255/motor-related-brain-abnormalities-in-hiv-infected-patients-a-multimodal-mri-study
#19
Yawen Zhou, Ruili Li, Xiaoxiao Wang, Hui Miao, Yarui Wei, Rizwan Ali, Bensheng Qiu, Hongjun Li
PURPOSE: It is generally believed that HIV infection could cause HIV-associated neurocognitive disorders (HAND) across a broad range of functional domains. Some of the most common findings are deficits in motor control. However, to date no neuroimaging studies have evaluated basic motor control in HIV-infected patients using a multimodal approach. METHODS: In this study, we utilized high-resolution structural imaging and task-state functional magnetic resonance imaging (fMRI) to assess brain structure and motor function in a homogeneous cohort of HIV-infected patients...
September 9, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28882707/functional-connectivity-of-large-scale-brain-networks-in-patients-with-anti-nmda-receptor-encephalitis-an-observational-study
#20
Michael Peer, Harald Prüss, Inbal Ben-Dayan, Friedemann Paul, Shahar Arzy, Carsten Finke
BACKGROUND: In anti-NMDA receptor (NMDAR) encephalitis, antibody-mediated dysfunction of NMDARs causes severe neuropsychiatric symptoms, including psychosis, memory deficits, and movement disorders. However, it remains elusive how antibody-mediated NMDAR dysfunction leads to these symptoms, and whether the symptoms arise from impairment in specific brain regions and the interactions between impaired regions. METHODS: In this observational study, we recruited 43 patients with anti-NMDAR encephalitis from a tertiary university hospital and 43 age-matched and sex-matched healthy controls without a history of neurological or psychiatric disorders, who were recruited from the general population of Berlin...
September 4, 2017: Lancet Psychiatry
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