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https://www.readbyqxmd.com/read/30504429/csf-%C3%AE-amyloid-42-and-risk-of-freezing-of-gait-in-early-parkinson-disease
#1
Ryul Kim, Joongyub Lee, Han-Joon Kim, Aryun Kim, Mihee Jang, Beomseok Jeon, Un Jung Kang
OBJECTIVE: To determine whether CSF biomarkers can be used as a predictor of freezing of gait (FOG) in Parkinson disease (PD) and to investigate the predictive value of clinical, dopamine transporter (DAT) imaging, and CSF parameters both separately and in combination. METHODS: This study using the PPMI data included 393 patients with newly diagnosed PD without FOG at baseline. We evaluated CSF for β-amyloid 1-42 (Aβ42 ), α-synuclein, total tau, phosphorylated tau181 , and the calculated ratio of Aβ42 to total tau at baseline...
November 30, 2018: Neurology
https://www.readbyqxmd.com/read/30480086/risk-factors-of-levodopa-induced-dyskinesia-in-parkinson-s-disease-results-from-the-ppmi-cohort
#2
Paolo Eusebi, Michele Romoli, Federico Paolini Paoletti, Nicola Tambasco, Paolo Calabresi, Lucilla Parnetti
Levodopa-induced dyskinesias (LID) negatively impact on the quality of life of patients with Parkinson's disease (PD). We assessed the risk factors for LID in a cohort of de-novo PD patients enrolled in the Parkinson's Progression Markers Initiative (PPMI). This retrospective cohort study included all PD patients enrolled in the PPMI cohort. Main outcome was the incidence rate of dyskinesia, defined as the first time the patient reported a non-zero score in the item "Time spent with dyskinesia" of the MDS-UPDRS part IV...
2018: NPJ Parkinson's Disease
https://www.readbyqxmd.com/read/30450079/serum-insulin-like-growth-factor-1-in-parkinson-s-disease-study-of-cerebrospinal-fluid-biomarkers-and-white-matter-microstructure
#3
Farzaneh Ghazi Sherbaf, Bahram Mohajer, Amir Ashraf-Ganjouei, Mahtab Mojtahed Zadeh, Ali Javinani, Hossein Sanjari Moghaddam, Mehdi Shirin Shandiz, Mohammad Hadi Aarabi
Background: Growing evidence shows that impaired signaling of Insulin-like Growth Factor-1 (IGF-1) is associated with neurodegenerative disorders, such as Parkinson's disease (PD). However, there is still controversy regarding its proinflammatory or neuroprotective function. In an attempt to elucidate the contribution of IGF-1 in PD, we aimed to discover the relation between serum IGF-1 levels in drug-naïve early PD patients and cerebrospinal fluid (CSF) biomarkers as well as microstructural changes in brain white matter...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/30443709/influence-of-permanent-pacemaker-implantation-after-transcatheter-aortic-valve-implantation-with-new-generation-devices
#4
B Gonska, M Keßler, J Wöhrle, W Rottbauer, J Seeger
OBJECTIVE: Permanent pacemaker implantation (PPMI) after transcatheter aortic valve implantation (TAVI) is the most common complication after the procedure. PPMI rates remain high with the new-generation TAVI devices despite improved outcomes concerning paravalvular aortic regurgitation and vascular access complications. However, the impact of PPMI on mortality and clinical outcome is still a matter of debate, and data with new-generation devices on this matter are scarce. Therefore, we sought to analyse the influence of PPMI in patients treated with the new-generation devices on one-year outcome...
November 15, 2018: Netherlands Heart Journal
https://www.readbyqxmd.com/read/30349475/progressive-decline-in-gray-and-white-matter-integrity-in-de-novo-parkinson-s-disease-an-analysis-of-longitudinal-parkinson-progression-markers-initiative-diffusion-tensor-imaging-data
#5
Kirsten I Taylor, Fabio Sambataro, Frank Boess, Alessandro Bertolino, Juergen Dukart
Background: Progressive neuronal loss in neurodegenerative diseases such as Parkinson's disease (PD) is associated with progressive degeneration of associated white matter tracts as measured by diffusion tensor imaging (DTI). These findings may have diagnostic and functional implications but their value in de novo PD remains unknown. Here we analyzed longitudinal DTI data from Parkinson's Progression Markers Initiative de novo PD patients for changes over time relative to healthy control (HC) participants. Methods: Baseline and 1-year follow-up DTI MRI data from 71 PD patients and 45 HC PPMI participants were included in the analyses...
2018: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/30338062/csf-a%C3%AE-1-42-level-is-associated-with-cognitive-decline-in-early-parkinson-s-disease-with-rapid-eye-movement-sleep-behavior-disorder
#6
Maowen Ba, Guoping Yu, Min Kong, Hui Liang, Ling Yu
Background: Rapid eye movement sleep behavior disorder (RBD) is associated with cognitive decline in early Parkinson's disease (PD). However, the underlyling basis for this association remains unclear. Methods: Parkinson's Progression Marker's Initiative (PPMI) subjects underwent baseline RBD testing with RBD sleep questionnaire (RBDSQ). Serial assessments included measures of motor symptoms, non-motor symptoms (NMS), neuropsychological assessment, blood and cerebrospinal fluid (CSF) biomarkers...
2018: Translational Neurodegeneration
https://www.readbyqxmd.com/read/30336481/cortical-thinning-associated-with-age-and-csf-biomarkers-in-early-parkinson-s-disease-is-modified-by-the-snca-rs356181-polymorphism
#7
Frederic Sampedro, Juan Marín-Lahoz, Saul Martínez-Horta, Javier Pagonabarraga, Jaime Kulisevsky
The role of cerebrospinal fluid (CSF) biomarkers such as CSF α-synuclein and CSF tau in predicting cognitive decline in Parkinson's disease (PD) continues to be inconsistent. Here, using a cohort of de novo PD patients with preserved cognition from the Parkinson's Progression Markers Initiative (PPMI), we show that the SNCA rs356181 single nucleotide polymorphism (SNP) modulates the effect of these CSF biomarkers on cortical thinning. Depending on this SNP's genotype, cortical atrophy was associated with either higher or lower CSF biomarker levels...
October 18, 2018: Neuro-degenerative Diseases
https://www.readbyqxmd.com/read/30335414/worse-cognitive-performance-predicts-increased-anxiety-and-depressive-symptoms-in-patients-with-parkinson-s-disease-a-bidirectional-analysis
#8
Andrew J Petkus, J Vincent Filoteo, Dawn M Schiehser, Megan E Gomez, Giselle Petzinger
OBJECTIVE: Symptoms of anxiety, depression commonly co-occur with cognitive decline in patients with Parkinson's disease (PD). The directionality of this association is unclear, however, in that poor cognitive performance may lead to increased symptoms of anxiety and depression or higher anxiety and depressive symptoms may lead to cognitive decline. The purpose of this study was to elucidate the directionality of the association between symptoms of anxiety and depression with cognitive performance in newly diagnosed patients with PD...
October 18, 2018: Neuropsychology
https://www.readbyqxmd.com/read/30322338/empirical-functional-pca-for-3d-image-feature-extraction-through-fractal-sampling
#9
Andrés Ortiz, Jorge Munilla, Francisco J Martínez-Murcia, Juan M Górriz, Javier Ramírez
Medical image classification is currently a challenging task that can be used to aid the diagnosis of different brain diseases. Thus, exploratory and discriminative analysis techniques aiming to obtain representative features from the images play a decisive role in the design of effective Computer Aided Diagnosis (CAD) systems, which is especially important in the early diagnosis of dementia. In this work, we present a technique that allows using specific time series analysis techniques with 3D images. This is achieved by sampling the image using a fractal-based method which preserves the spatial relationship among voxels...
August 29, 2018: International Journal of Neural Systems
https://www.readbyqxmd.com/read/30311095/a-new-chemoinformatics-approach-with-improved-strategies-for-effective-predictions-of-potential-drugs
#10
Ming Hao, Stephen H Bryant, Yanli Wang
BACKGROUND: Fast and accurate identification of potential drug candidates against therapeutic targets (i.e., drug-target interactions, DTIs) is a fundamental step in the early drug discovery process. However, experimental determination of DTIs is time-consuming and costly, especially for testing the associations between the entire chemical and genomic spaces. Therefore, computationally efficient algorithms with accurate predictions are required to achieve such a challenging task. In this work, we design a new chemoinformatics approach derived from neighbor-based collaborative filtering (NBCF) to infer potential drug candidates for targets of interest...
October 11, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/30292088/white-matter-hyperintensities-are-linked-to-future-cognitive-decline-in-de-novo-parkinson-s-disease-patients
#11
Mahsa Dadar, Yashar Zeighami, Yvonne Yau, Seyed-Mohammad Fereshtehnejad, Josefina Maranzano, Ronald B Postuma, Alain Dagher, D Louis Collins
White Matter Hyperintensities (WMHs) are associated with cognitive decline in aging and Alzheimer's disease. However, the pathogenesis of cognitive decline in Parkinson's disease (PD) is not as clearly related to vascular causes, and therefore the role of WMHs as a marker of small-vessel disease (SVD) in PD is less clear. Currently, SVD in PD is assessed and treated independently of the disease. However, if WMH as the major MRI sign of SVD has a higher impact on cognitive decline in PD patients than in healthy controls, vascular pathology needs to be assessed and treated with a higher priority in this population...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/30282359/brain-amyloid-contribution-to-cognitive-dysfunction-in-early-stage-parkinson-s-disease-the-ppmi-dataset
#12
Eleonora Fiorenzato, Roberta Biundo, Diego Cecchin, Anna Chiara Frigo, Jinhee Kim, Luca Weis, Antonio P Strafella, Angelo Antonini
BACKGROUND: The pathological processes underlying cognitive impairment in Parkinson's disease (PD) are heterogeneous and the contribution of cerebral amyloid deposits is poorly defined, particularly in the early stages of the disease. OBJECTIVE: To investigate regional [18F]florbetaben binding to amyloid-β (Aβ) and its contribution to cognitive dysfunction in early stage PD. METHODS: A multicenter cohort of 48 PD patients from the Parkinson's Progression Marker Initiative (PPMI) underwent [18F]florbetaben positron emission tomography (PET) scanning...
2018: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/30236547/association-of-autonomic-symptoms-with-presynaptic-striatal-dopamine-depletion-in-drug-naive-parkinson-s-disease-an-analysis-of-the-ppmi-data
#13
Ryul Kim, Jin-Sun Jun
While the involvement of the central and peripheral autonomic networks is thought to play an integral role in the development of autonomic symptoms in Parkinson's disease (PD), there is little evidence for an association between autonomic symptoms and striatal dopaminergic depletion. We compared dopamine transporter activity in striatal subregions with various autonomic symptoms covered by the SCOPA-AUT domains including gastrointestinal, urinary, cardiovascular, thermoregulatory, pupillomotor, and sexual symptoms in 418 untreated patients with PD...
September 15, 2018: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/30225168/autonomic-dysfunction-and-white-matter-microstructural-changes-in-drug-na%C3%A3-ve-patients-with-parkinson-s-disease
#14
Amir Ashraf-Ganjouei, Alireza Majd, Ali Javinani, Mohammad Hadi Aarabi
Background: Autonomic dysfunction (AD) is one of the non-motor features of Parkinson's disease (PD). Some symptoms tend to occur in the early stages of PD. AD also has a great impact on patient's quality of life. In this study, we aimed to discover the association between AD (Scales for Outcomes in Parkinson's disease-Autonomic, SCOPA-AUT) and microstructural changes in white matter tracts in drug-naïve early PD patients to elucidate the central effects of autonomic nervous system impairments...
2018: PeerJ
https://www.readbyqxmd.com/read/30223823/the-prejudice-towards-people-with-mental-illness-ppmi-scale-structure-and-validity
#15
Amanda Kenny, Boris Bizumic, Kathleen M Griffiths
BACKGROUND: Although there is a substantial body of research on the stigma associated with mental illness, much of the extant research has not explicitly focused on the concept of prejudice, which drives discriminatory behaviour. Further, research that has investigated prejudice towards people with mental illness has conceptual, theoretical and psychometric limitations. To address these shortcomings, we sought to develop a new measure, the Prejudice towards People with Mental Illness (PPMI) scale, based on an improved conceptualisation and integration of the stigma and prejudice areas of research...
September 12, 2018: BMC Psychiatry
https://www.readbyqxmd.com/read/30209586/diversity-and-tissue-preference-of-osmotolerant-bacterial-endophytes-associated-with-pearl-millet-genotypes-having-differential-drought-susceptibilities
#16
B S Manjunatha, Sangeeta Paul, Chetana Aggarwal, S Bandeppa, V Govindasamy, Ajinath S Dukare, Maheshwar S Rathi, C T Satyavathi, K Annapurna
Genetic and functional diversity of osmotolerant bacterial endophytes colonizing the root, stem, and leaf tissues of pearl millet genotypes differing in their drought susceptibility was assessed. Two genotypes of pearl millet, viz., the drought tolerant genotype TT-1 and the drought susceptible genotype PPMI-69, were used in the present study. Diazotrophs were found to be the predominant colonizers, followed by the Gram positive bacteria in most of the tissues of both the genotypes. Higher proportion of bacterial endophytes obtained from the drought tolerant genotype was found to be osmotolerant...
September 12, 2018: Microbial Ecology
https://www.readbyqxmd.com/read/30183649/parkinson-s-disease-diagnosis-via-joint-learning-from-multiple-modalities-and-relations
#17
Haijun Lei, Zhongwei Huang, Feng Zhou, Ahmed Elazab, Ee-Leng Tan, Hancong Li, Jing Qin, Baiying Lei
Parkinson's disease (PD) is a neurodegenerative progressive disease that mainly affects the motor systems of patients. To slow this disease deterioration, early and accurate diagnosis of PD is an effective way, which alleviates mental and physical sufferings by clinical intervention. In this paper, we propose a joint regression and classification framework for PD diagnosis via magnetic resonance and diffusion tensor imaging data. Specifically, we devise a unified multi-task feature selection model to explore multiple relationships among features, samples, and clinical scores...
September 3, 2018: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/30146185/dopamine-transporter-availability-reflects-gastrointestinal-dysautonomia-in-early-parkinson-disease
#18
Jared T Hinkle, Kate Perepezko, Kelly A Mills, Zoltan Mari, Ankur Butala, Ted M Dawson, Alexander Pantelyat, Liana S Rosenthal, Gregory M Pontone
BACKGROUND: Constipation is a prodromal feature of Parkinson's disease (PD) and the gastrointestinal (GI) tract is implicated in the pathogenesis of PD. However, no studies have demonstrated ante-mortem relationships between nigrostriatal dysfunction and GI dysautonomia in PD. METHODS: The Scale for Outcomes in Parkinson's disease for Autonomic Symptoms (SCOPA-AUT) assesses dysautonomia in the multi-center Parkinson's Progression Marker Initiative (PPMI). We used linear mixed-effects models and reliable change indices (RCIs) to examine longitudinal associations between dysautonomia and dopamine transporter (DAT) striatal binding ratios (SBRs) measured by single-photon emission computerized tomography in PPMI participants over four years (n = 397 at baseline)...
October 2018: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/30125297/cognition-among-individuals-along-a-spectrum-of-increased-risk-for-parkinson-s-disease
#19
Lana M Chahine, Liz Urbe, Chelsea Caspell-Garcia, Dag Aarsland, Roy Alcalay, Paolo Barone, David Burn, Alberto J Espay, Jamie L Hamilton, Keith A Hawkins, Shirley Lasch, James B Leverenz, Irene Litvan, Irene Richard, Andrew Siderowf, Christopher S Coffey, Tanya Simuni, Daniel Weintraub
INTRODUCTION: Several characteristics associated with increased risk for Parkinson's disease (PD) have been identified, including specific genotypes and various non-motor symptoms. Characterizing non-motor features, such as cognitive abilities, among individuals considered at-risk for PD is essential to improving prediction of future neurodegeneration. METHODS: Participants belonging to the following cohorts of the Parkinson Progression Markers Initiative (PPMI) study were included: de novo PD with dopamine transporter binding deficit (n = 423), idiopathic REM sleep behavior disorder (RBD, n = 39), hyposmia (n = 26) and non-PD mutation carrier (NMC; Leucine-rich repeat kinase 2 (LRRK2) G2019S (n = 88) and glucocerebrosidase (GBA) gene (n = 38) mutations))...
2018: PloS One
https://www.readbyqxmd.com/read/30124452/altered-cortico-limbic-network-connectivity-in-parkinsonian-depression-the-effect-of-antidepressants
#20
Howard E Morgan, Christina R Ledbetter, Christopher Ferrier, Richard M Zweig, Elizabeth A Disbrow
BACKGROUND: Depression is a common comorbidity of Parkinson's disease (PD); however, the impact of antidepressant status on cortical function in parkinsonian depression is not fully understood. While studies of resting state functional MRI in major depression have shown that antidepressant treatment affects cortical connectivity, data on connectivity and antidepressant status in PD is sparse. OBJECTIVE: We tested the hypothesis that cortico-limbic network (CLN) resting state connectivity is abnormal in antidepressant-treated parkinsonian depression...
2018: Journal of Parkinson's Disease
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