keyword
MENU ▼
Read by QxMD icon Read
search

Parkinsonian

keyword
https://www.readbyqxmd.com/read/29337309/role-for-vglut2-in-selective-vulnerability-of-midbrain-dopamine-neurons
#1
Thomas Steinkellner, Vivien Zell, Zachary J Farino, Mark S Sonders, Michael Villeneuve, Robin J Freyberg, Serge Przedborski, Wei Lu, Zachary Freyberg, Thomas S Hnasko
Parkinson's disease is characterized by the loss of dopamine (DA) neurons in the substantia nigra pars compacta (SNc). DA neurons in the ventral tegmental area are more resistant to this degeneration than those in the SNc, though the mechanisms for selective resistance or vulnerability remain poorly understood. A key to elucidating these processes may lie within the subset of DA neurons that corelease glutamate and express the vesicular glutamate transporter VGLUT2. Here, we addressed the potential relationship between VGLUT expression and DA neuronal vulnerability by overexpressing VGLUT in DA neurons of flies and mice...
January 16, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29335072/rebound-excitability-mediates-motor-abnormalities-in-parkinson-s-disease
#2
Jeongjin Kim, Daesoo Kim
Parkinson's disease (PD) is a debilitating disorder resulting from loss of dopamine neurons. In dopamine deficient state, the basal ganglia increases inhibitory synaptic outputs to the thalamus. This increased inhibition by the basal ganglia output is known to reduce firing rate of thalamic neurons that relay motor signals to the motor cortex. This 'rate model' suggests that the reduced excitability of thalamic neurons is the key for inducing motor abnormalities in PD patients. We reveal that in response to inhibition, thalamic neurons generate rebound firing at the end of inhibition...
January 16, 2018: BMB Reports
https://www.readbyqxmd.com/read/29332087/adaptive-brain-stimulation-for-movement-disorders
#3
Martijn Beudel, Hayriye Cagnan, Simon Little
Deep brain stimulation (DBS) has markedly changed how we treat movement disorders including Parkinson's disease (PD), dystonia, and essential tremor (ET). However, despite its demonstrable clinical benefit, DBS is often limited by side effects and partial efficacy. These limitations may be due in part to the fact that DBS interferes with both pathological and physiological neural activities. DBS could, therefore, be potentially improved were it applied selectively and only at times of enhanced pathological activity...
2018: Progress in Neurological Surgery
https://www.readbyqxmd.com/read/29324935/right-putamen-and-age-are-the-most-discriminant-features-to-diagnose-parkinson-s-disease-by-using-123i-fp-cit-brain-spet-data-by-using-an-artificial-neural-network-classifier-a-classification-tree-clt
#4
S Cascianelli, C Tranfaglia, M L Fravolini, F Bianconi, M Minestrini, S Nuvoli, N Tambasco, M E Dottorini, B Palumbo
OBJECTIVE: The differential diagnosis of Parkinson's disease (PD) and other conditions, such as essential tremor and drug-induced parkinsonian syndrome or normal aging brain, represents a diagnostic challenge. 123I-FP-CIT brain SPET is able to contribute to the differential diagnosis. Semiquantitative analysis of radiopharmaceutical uptake in basal ganglia (caudate nuclei and putamina) is very useful to support the diagnostic process. An artificial neural network classifier using 123I-FP-CIT brain SPET data, a classification tree (CIT), was applied...
September 2017: Hellenic Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/29324447/characteristic-motor-and-nonmotor-symptoms-related-to-quality-of-life-in-drug-na%C3%A3-ve-patients-with-late-onset-parkinson-disease
#5
Hea Ree Park, Jinyoung Youn, Jin Whan Cho, Eung-Seok Oh, Ji Sun Kim, Suyeon Park, Wooyoung Jang, Jin Se Park
BACKGROUND/AIMS: Unlike young-onset Parkinson disease (YOPD), characteristics of late-onset PD (LOPD) have not yet been clearly elucidated. We investigated characteristic features and symptoms related to quality of life (QoL) in LOPD patients. METHODS: We recruited drug-naïve, early PD patients. The patient cohort was divided into 3 subgroups based on patient age at onset (AAO): the YOPD group (AAO <50 years), the middle-onset PD (MOPD) group, and the LOPD group (AAO ≥70 years)...
January 12, 2018: Neuro-degenerative Diseases
https://www.readbyqxmd.com/read/29323122/effect-of-rhythmic-auditory-cueing-on-parkinsonian-gait-a-systematic-review-and-meta-analysis
#6
Shashank Ghai, Ishan Ghai, Gerd Schmitz, Alfred O Effenberg
The use of rhythmic auditory cueing to enhance gait performance in parkinsonian patients' is an emerging area of interest. Different theories and underlying neurophysiological mechanisms have been suggested for ascertaining the enhancement in motor performance. However, a consensus as to its effects based on characteristics of effective stimuli, and training dosage is still not reached. A systematic review and meta-analysis was carried out to analyze the effects of different auditory feedbacks on gait and postural performance in patients affected by Parkinson's disease...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29316636/segmentation-of-gait-sequences-in-sensor-based-movement-analysis-a-comparison-of-methods-in-parkinson-s-disease
#7
Nooshin Haji Ghassemi, Julius Hannink, Christine F Martindale, Heiko Gaßner, Meinard Müller, Jochen Klucken, Björn M Eskofier
Robust gait segmentation is the basis for mobile gait analysis. A range of methods have been applied and evaluated for gait segmentation of healthy and pathological gait bouts. However, a unified evaluation of gait segmentation methods in Parkinson's disease (PD) is missing. In this paper, we compare four prevalent gait segmentation methods in order to reveal their strengths and drawbacks in gait processing. We considered peak detection from event-based methods, two variations of dynamic time warping from template matching methods, and hierarchical hidden Markov models (hHMMs) from machine learning methods...
January 6, 2018: Sensors
https://www.readbyqxmd.com/read/29287113/diffusion-weighted-mri-distinguishes-parkinson-disease-from-the-parkinsonian-variant-of-multiple-system-atrophy-a-systematic-review-and-meta-analysis
#8
Sweta Bajaj, Florian Krismer, Jose-Alberto Palma, Gregor K Wenning, Horacio Kaufmann, Werner Poewe, Klaus Seppi
BACKGROUND: Putaminal diffusivity in brain magnetic resonance diffusion-weighted imaging (DWI) is increased in patients with the parkinsonian variant of multiple system atrophy (MSA-P) compared to Parkinson disease (PD) patients. PURPOSE: We performed a systematic review and meta-analysis to evaluate the diagnostic accuracy of DWI to distinguish MSA-P from PD. METHODS: Studies on DWI were identified through a systematic PubMed and Clarivate Analytics® Web of Science® Core Collection search...
2017: PloS One
https://www.readbyqxmd.com/read/29285639/analysis-of-3d-spatial-trajectories-in-parkinsonian-essential-and-physiological-tremors
#9
Peter Jombík, Pavel Spodniak, Vladimír Bahýľ, Ján Necpál
The clinical differentiation of the tremor in Parkinson's disease (PD) and essential tremor (ET) can sometimes be challenging, especially in the early stage of the disease. As different neural oscillators are involved in the generation of these two types of tremor, their trajectorial analysis could also be different. The goal of this study was to investigate whether some disease-specific patterns related to their tremor trajectories in fact exist. The three-axial accelerometer signals of the hand tremor obtained from a total of 369 participants [49 with PD, 25 with isolated resting tremor (iRT), 133 with ET, and finally 162 normal subjects with physiological tremor (Ph)] were subjected to vector analysis using a custom-made mathematical program...
December 28, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/29273299/-self-intermittent-catheterization-and-urinary-retentions-in-parkinsonian-syndromes
#10
E Savard, A Declemy, V Coindreau, F Babany, C Chesnel, A Charlanes, F Le Breton, G Amarenco
INTRODUCTION: Lower urinary tract symptoms are common in Parkinson diseases, especially chronic urinary retention. In case of significant and symptomatic postvoid residual, a specific treatment is necessary in order to empty the bladder and nowadays the gold standard of such neurogenic bladder is based on self-intermittent-catheterizations, if possible at all. We carried out a retrospective study about feasibility and outcomes of self-intermittent-catheterizations in this population. METHODS: Retrospective study with qualitative and quantitative, clinical and instrumental (urodynamic) assessment, of lower urinary tract symptoms as urinary retention in extrapyramidal syndromes...
December 19, 2017: Progrès en Urologie
https://www.readbyqxmd.com/read/29250896/changes-in-neuronal-activity-of-cortico-basal-ganglia-thalamic-networks-induced-by-acute-dopaminergic-manipulations-in-rats
#11
Nedjeljka Ivica, Ulrike Richter, Joel Sjöbom, Ivani Brys, Martin Tamtè, Per Petersson
The basal ganglia are thought to be particularly sensitive to changes in dopaminergic tone, and the realization that reduced dopaminergic signaling causes pronounced motor dysfunction is the rationale behind dopamine replacement therapy in Parkinson's disease. It has however proven difficult to identify which neurophysiological changes that ultimately lead to motor dysfunctions. To clarify this, we have here recorded neuronal activity throughout the cortico-basal ganglia-thalamic circuits in freely behaving rats during periods of immobility following acute dopaminergic manipulations, involving both vesicular depletion and antagonism of D1 and D2 type dopamine receptors...
December 18, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29250861/cortical-stimulation-relieves-parkinsonian-pathological-activity-in-vitro
#12
Ariadna Aparicio-Juárez, Mariana Duhne, Esther Lara-González, Fátima Ávila-Cascajares, Vladimir Calderón, Elvira Galarraga, José Bargas
Previously we have shown that chemical excitatory drives such as NMDA are capable of activating the striatal microcircuit exhibiting neuronal ensembles that alternate their activity producing temporal sequences. One aim of this work is to demonstrate whether similar activity could be evoked by delivering cortical stimulation. Dynamic calcium imaging allowed us to follow the activity of dozens of neurons with single cell resolution in mus musculus brain slices. A train of electrical stimuli in the cortex evoked network activity similar to the one induced by bath application of NMDA...
December 18, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29248630/cortical-slow-wave-activity-correlates-with-striatal-synaptic-strength-in-normal-but-not-in-parkinsonian-rats
#13
Salvatore Galati, Song Wei, Gergely Orban, Andreas R Luft, Alain Kaelin-Lang
Urethane-induced cortical slow wave activity (SWA) spreads into the basal ganglia in dopamine (DA)-depleted rat models of Parkinson's disease (PD). During physiological sleep, SWA is powerfully expressed at the beginning of night and progressively reduced during sleep-time reflecting the sleep need. However, its underlying slow oscillations may contribute directly to modulate cortical plasticity. In order to determine the impact of the SWA on synaptic strength and its interplay with DA, we simultaneously recorded the electrocorticogram (ECoG) and the corticocortical- and corticostriatal-evoked potentials (CC-EPs, CS-EPs) during eight hours of robust urethane-induced SWA in both normal and PD animals...
December 15, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/29247391/trazodone-alleviates-both-dyskinesia-and-psychosis-in-the-parkinsonian-marmoset-model-of-parkinson-s-disease
#14
Adjia Hamadjida, Stephen G Nuara, Jim C Gourdon, Philippe Huot
Trazodone is a clinically available anti-depressant that exhibits affinity for serotonin 1A and 2A receptors, as well as for alpha-adrenoceptors, suggesting that it may be useful to treat L-3,4-dihydroxyphenylalanine (L-DOPA)-induced dyskinesia and psychosis that are encountered in advanced Parkinson's disease (PD). Here, we investigated the anti-dyskinetic and anti-psychotic effects of trazodone in the parkinsonian non-human primate. 6 common marmosets were rendered parkinsonian by administration of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)...
December 15, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/29247084/protocol-of-a-single-group-prospective-observational-study-on-the-diagnostic-value-of-3t-susceptibility-weighted-mri-of-nigrosome-1-in-patients-with-parkinsonian-symptoms-the-n3ipd-study-nigrosomal-iron-imaging-in-parkinson-s-disease
#15
Stefan T Schwarz, Yue Xing, Saadnah Naidu, Jim Birchall, Rob Skelly, Alan Perkins, Jonathan Evans, Gill Sare, Antonio Martin-Bastida, Nin Bajaj, Penny Gowland, Paola Piccini, Dorothee P Auer
INTRODUCTION: Parkinson's disease (PD) is the most common movement disorder in the elderly and is characterised clinically by bradykinesia, tremor and rigidity. Diagnosing Parkinson's can be difficult especially in the early stages. High-resolution nigrosome MRI offers promising diagnostic accuracy of patients with established clinical symptoms; however, it is unclear whether this may help to establish the diagnosis in the early stages of PD, when there is diagnostic uncertainty. In this scenario, a single photon emission CT scan using a radioactive dopamine transporter ligand can help to establish the diagnosis, or clinical follow-up may eventually clarify the diagnosis...
December 14, 2017: BMJ Open
https://www.readbyqxmd.com/read/29247072/vascular-and-dopaminergic-contributors-to-mild-parkinsonian-signs-in-older-adults
#16
Andrea L Rosso, Nicolaas I Bohnen, Lenore J Launer, Howard J Aizenstein, Kristine Yaffe, Caterina Rosano
OBJECTIVE: Mild parkinsonian signs (MPS) are an underappreciated neurologic condition in older adults; we assessed associations of MPS with measures of dopaminergic (catechol-O-methyltransferase [COMT] genotype, an indicator of synaptic dopamine levels) and vascular (white matter hyperintensities [WMH], an indicator of cerebral small vessel disease) factors. METHODS: In a cohort of older adults (mean age 82.6 years [SD 2.6]; 58.0% female; 38.8% black), we assessed cross-sectional associations of WMH volume and COMT Val158Met (rs4680) genotype (n = 35 Met/Met, n = 180 Val carriers) with MPS by regression models adjusted for demographic and health characteristics...
December 15, 2017: Neurology
https://www.readbyqxmd.com/read/29246613/clinical-management-of-tardive-dyskinesia-five-steps-to-success
#17
REVIEW
Leslie Citrome
Tardive dyskinesia (TD) has long been thought to be a generally irreversible consequence of the use of dopamine receptor blocking agents. There is now an opportunity to successfully manage this condition with agents approved by the US Food and Drug Administration. This is important because TD has not been eliminated with the use of second-generation antipsychotics, and the expansion of antipsychotics to treat conditions other than schizophrenia has resulted in millions of additional individuals at risk for developing TD...
December 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29242978/animal-models-of-l-dopa-induced-dyskinesia-the-6-ohda-lesioned-rat-and-mouse
#18
REVIEW
Elisabetta Tronci, Veronica Francardo
Appearance of L-DOPA-induced dyskinesia (LID) represents a major limitation in the pharmacological therapy with the dopamine precursor L-DOPA. Indeed, the vast majority of parkinsonian patients develop dyskinesia within 9-10 years of L-DOPA oral administration. This makes the discovery of new therapeutic strategies an important need. In the last decades, several animal models of Parkinson's disease (PD) have been developed, to both study mechanisms underlying PD pathology and treatment-induced side effects (i...
December 14, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/29240814/towards-the-identification-of-idiopathic-parkinson-s-disease-from-the-speech-new-articulatory-kinetic-biomarkers
#19
J I Godino-Llorente, S Shattuck-Hufnagel, J Y Choi, L Moro-Velázquez, J A Gómez-García
Although a large amount of acoustic indicators have already been proposed in the literature to evaluate the hypokinetic dysarthria of people with Parkinson's Disease, the goal of this work is to identify and interpret new reliable and complementary articulatory biomarkers that could be applied to predict/evaluate Parkinson's Disease from a diadochokinetic test, contributing to the possibility of a further multidimensional analysis of the speech of parkinsonian patients. The new biomarkers proposed are based on the kinetic behaviour of the envelope trace, which is directly linked with the articulatory dysfunctions introduced by the disease since the early stages...
2017: PloS One
https://www.readbyqxmd.com/read/29237549/modeling-parkinson-s-disease-and-treatment-complications-in-rodents-potentials-and-pitfalls-of-the-current-options
#20
REVIEW
Veronica Francardo
Animal models of neurological deficits are essential to assess new therapeutic options and reduce treatment complications. Over the last decades, several rodent models of Parkinson's disease have been developed, and have now become the first-line experimental tool for therapeutic screening purposes. Which model is the most predictive for identifying the efficacy of symptomatic or disease-modifying interventions is still a matter of debate. None of the models so far available is able to recapitulate all the features of the human disease, but several well-characterized models with complementary features currently provide a valuable repertoire of tools to address specific scientific hypotheses...
December 10, 2017: Behavioural Brain Research
keyword
keyword
63650
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"