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dementia imaging

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https://www.readbyqxmd.com/read/29679574/evidence-of-demyelination-in-mild-cognitive-impairment-and-dementia-using-a-direct-and-specific-magnetic-resonance-imaging-measure-of-myelin-content
#1
Mustapha Bouhrara, David A Reiter, Christopher M Bergeron, Linda M Zukley, Luigi Ferrucci, Susan M Resnick, Richard G Spencer
INTRODUCTION: We investigated brain demyelination in aging, mild cognitive impairment (MCI), and dementia using magnetic resonance imaging of myelin. METHODS: Brains of young and old controls and old subjects with MCI, Alzheimer's disease, or vascular dementia were scanned using our recently developed myelin water fraction (MWF) mapping technique, which provides greatly improved accuracy over previous comparable methods. Maps of MWF, a direct and specific myelin measure, and relaxation times and magnetization transfer ratio, indirect and nonspecific measures, were constructed...
April 18, 2018: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/29674420/white-matter-reference-region-in-pet-studies-of-11-c-pittsburgh-compound-b-uptake-effects-of-age-and-amyloid-%C3%AE-deposition
#2
Val J Lowe, Emily S Lundt, Matthew L Senjem, Christopher G Schwarz, Hoon-Ki Min, Scott A Przybelski, Kejal Kantarci, David Knopman, Ronald C Petersen, Clifford R Jack
Amyloid-β (Aβ) deposition as seen on positron emission tomography (PET) using an Aβ binding agent is a critical diagnostic biomarker for Alzheimer's disease (AD). Some reports suggest using white matter (WM) as a reference region for quantification of serial Aβ PET studies; however, nonspecific WM retention in Aβ PET in people with dementia or in cognitively unimpaired (CU) has been widely reported and is poorly understood. Methods: To investigate the suitability of WM as a reference region and the factors affecting WM 11 C-Pittsburgh Compound B (PiB) uptake variability, we conducted a retrospective study on two large data sets: 1) a longitudinal study of participants ( n = 577) who were CU, had mild cognitive impairment (MCI), or had dementia likely due to AD (ADD); and 2) a cross-sectional study of single-scan PET imaging in CU subjects ( n = 1349)...
April 19, 2018: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29673784/visual-texture-agnosia-in-dementia-with-lewy-bodies-and-alzheimer-s-disease
#3
Yuka Oishi, Toru Imamura, Tatsuo Shimomura, Kyoko Suzuki
BACKGROUND: Neuroimaging and some clinical studies have reported that the ventral visual pathway is relevant for visual texture recognition. Although a variety of visual deficits have been reported in patients with Alzheimer's disease (AD) and dementia with Lewy bodies (DLB), visual material identification and texture recognition have not been thoroughly examined. OBJECTIVES: To investigate visual texture recognition in patients with AD and DLB and to clarify the relationship between visual texture recognition and various visuoperceptual functions...
March 27, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29672930/clinical-and-imaging-correlates-of-amyloid-deposition-in-dementia-with-lewy-bodies
#4
Paul C Donaghy, Michael J Firbank, Alan J Thomas, Jim Lloyd, George Petrides, Nicola Barnett, Kirsty Olsen, John T O'Brien
BACKGROUND: Amyloid deposition is common in dementia with Lewy bodies, but its pathophysiological significance is unclear. OBJECTIVE: The objective of this study was to investigate the relationship between amyloid deposition and clinical profile, gray matter volume, and brain perfusion in dementia with Lewy bodies. METHODS: Dementia with Lewy bodies (n = 37), Alzheimer's disease (n = 20), and controls (n = 20) underwent a thorough clinical assessment, 3T MRI, and early- and late-phase 18 F-Florbetapir PET-CT to assess cortical perfusion and amyloid deposition, respectively...
April 19, 2018: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/29672236/the-brain-health-index-towards-a-combined-measure-of-neurovascular-and-neurodegenerative-structural-brain-injury
#5
David Alexander Dickie, Maria Del C Valdés Hernández, Stephen D Makin, Julie Staals, Stewart J Wiseman, Mark E Bastin, Joanna M Wardlaw
Background A structural magnetic resonance imaging measure of combined neurovascular and neurodegenerative burden may be useful as these features often coexist in older people, stroke and dementia. Aim We aimed to develop a new automated approach for quantifying visible brain injury from small vessel disease and brain atrophy in a single measure, the brain health index. Materials and methods We computed brain health index in N = 288 participants using voxel-based Gaussian mixture model cluster analysis of T1, T2, T2*, and FLAIR magnetic resonance imaging...
January 1, 2018: International Journal of Stroke: Official Journal of the International Stroke Society
https://www.readbyqxmd.com/read/29671539/evaluation-of-suspected-dementia
#6
Nathan Falk, Ariel Cole, T Jason Meredith
Dementia is a significant and costly health condition that affects 5 million adults and is the fifth leading cause of death among Americans older than 65 years. The prevalence of dementia will likely increase in the future because the number of Americans older than 65 years is expected to double by 2060. Risk factors for dementia include age; family history of dementia; personal history of cardiovascular disease, cerebrovascular disease, diabetes mellitus, or midlife obesity; use of anticholinergic medications; apolipoprotein E4 genotype; and lower education level...
March 15, 2018: American Family Physician
https://www.readbyqxmd.com/read/29666711/creutzfeldt-jakob-disease-presenting-as-expressive-aphasia-and-nonconvulsive-status-epilepticus
#7
Hafiz B Mahboob, Kazi H Kaokaf, Jeremy M Gonda
Creutzfeldt-Jakob disease (CJD), the most common form of human prion diseases, is a fatal condition with a mortality rate reaching 85% within one year of clinical presentation. CJD is characterized by rapidly progressive neurological deterioration in combination with typical electroencephalography (EEG) and magnetic resonance imaging (MRI) findings and positive cerebrospinal spinal fluid (CSF) analysis for 14-3-3 proteins. Unfortunately, CJD can have atypical clinical and radiological presentation in approximately 10% of cases, thus making the diagnosis often challenging...
2018: Case Reports in Critical Care
https://www.readbyqxmd.com/read/29664058/relationships-between-rapid-eye-movement-sleep-behavior-disorder-and-neurodegenerative-diseases-clinical-assessments-biomarkers-and-treatment
#8
REVIEW
Min Li, Li Wang, Jiang-Hong Liu, Shu-Qin Zhan
Objective: Rapid eye movement sleep behavior disorder (RBD) is characterized by dream enactment and loss of muscle atonia during rapid eye movement sleep. RBD is closely related to α-synucleinopathies including Parkinson's disease, dementia with Lewy bodies, and multiple system atrophy. Many studies have investigated the markers of imaging and neurophysiological, genetic, cognitive, autonomic function of RBD and their predictive value for neurodegenerative diseases. This report reviewed the progress of these studies and discussed their limitations and future research directions...
April 20, 2018: Chinese Medical Journal
https://www.readbyqxmd.com/read/29662895/heme-oxygenase-1-activity-as-a-correlate-to-exercise-mediated-amelioration-of-cognitive-decline-and-neuropathological-alterations-in-an-aging-rat-model-of-dementia
#9
Andrea Kurucz, Mariann Bombicz, Rita Kiss, Dániel Priksz, Balázs Varga, Tibor Hortobágyi, György Trencsényi, Renáta Szabó, Anikó Pósa, Rudolf Gesztelyi, Zoltán Szilvássy, Béla Juhász
Alzheimer's disease (AD) is a neurodegenerative disorder with cognitive impairment. Physical exercise has long been proven to be beneficial in the disorder. The present study was designed to examine the effect of voluntary exercise on spatial memory, imaging, and pathological abnormalities. Particular focus has been given to the role of heme oxygenase-1 (HO-1)-an important cellular cytoprotectant in preserving mental acuity-using an aging rat model of dementia. Male and female Wistar rats were segregated into six groups-namely, (i) aged sedentary (control) females (ASF, n = 8); (ii) aged sedentary (control) males (ASM, n = 8); (iii) aged running females (ARF, n = 8); (iv) aged running males (ARM, n = 8); (v) young control females (YCF, n = 8); and (vi) young control males (YCM, n = 8)...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29662677/auto-antibodies-against-p-q-and-n-type-voltage-dependent-calcium-channels-mimicking-frontotemporal-dementia
#10
Kyan Younes, Lauren A Lepow, Cynthia Estrada, Paul E Schulz
The behavioral variant of frontotemporal dementia is usually a sporadic and progressive neurodegenerative disorder. Here, we report the subacute onset of a frontotemporal dementia phenotype with a treatable etiology. The patient has a history of rheumatoid arthritis, episcleritis, and thyroid eye disease on immunosuppressive therapy. He experienced a rapid personality change, including inappropriate behavior, which suggested frontotemporal dementia. Results of imaging and neuropsychological testing also suggested frontotemporal dementia...
2018: SAGE Open Medical Case Reports
https://www.readbyqxmd.com/read/29659399/top-down-systematic-approach-to-interpretation-of-fdg-pet-for-dementia
#11
David M Sawyer, Phillip H Kuo
Dementia is an important cause of morbidity and mortality worldwide and encompasses a very heterogenous group of disease processes. Positron emission tomography (PET) of the brain using fluorodeoxyglucose (FDG) is a useful modality for differentiating types of dementia. Because FDG does not bind to pathologic proteins, FDG-PET requires that the reader recognize characteristic patterns of glucose hypometabolism to identify pathology. These patterns have been documented in the literature for both primary neurodegenerative disorders and secondary causes of dementia...
April 13, 2018: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/29657900/occipital-and-cingulate-hypometabolism-are-significantly-under-reported-on-18-fluorodeoxyglucose-positron-emission-tomography-scans-of-patients-with-lewy-body-dementia
#12
Moath Hamed, Frank Schraml, Jeffrey Wilson, James Galvin, Marwan N Sabbagh
Objective: To determine whether occipital and cingulate hypometabolism is being under-reported or missed on 18-fluorodeoxyglucose positron emission tomography (FDG-PET) CT scans in patients with Dementia with Lewy Bodies (DLB). Background: Recent studies have reported higher sensitivity and specificity for occipital and cingulate hypometabolism on FDG-PET of DLB patients. Methods: This retrospective chart review looked at regions of interest (ROI's) in FDG-PET CT scan reports in 35 consecutive patients with a clinical diagnosis of probable, possible, or definite DLB as defined by the latest DLB Consortium Report...
2018: Journal of Alzheimer's Disease and Parkinsonism
https://www.readbyqxmd.com/read/29656245/individual-differences-in-socioemotional-sensitivity-are-an-index-of-salience-network-function
#13
Gianina Toller, Jesse Brown, Marc Sollberger, Suzanne M Shdo, Laura Bouvet, Paul Sukhanov, William W Seeley, Bruce L Miller, Katherine P Rankin
Connectivity in intrinsically connected networks (ICNs) may predict individual differences in cognition and behavior. The drastic alterations in socioemotional awareness of patients with behavioral variant frontotemporal dementia (bvFTD) are presumed to arise from changes in one such ICN, the salience network (SN). We examined how individual differences in SN connectivity are reflected in overt social behavior in healthy individuals and patients, both to provide neuroscientific insight into this key brain-behavior relationship, and to provide a practical tool to diagnose patients with early bvFTD...
February 27, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29651720/biomarkers-study-in-atypical-dementia-proof-of-a-diagnostic-work-up
#14
Gemma Lombardi, Cristina Polito, Valentina Berti, Camilla Ferrari, Giulia Lucidi, Silvia Bagnoli, Irene Piaceri, Benedetta Nacmias, Alberto Pupi, Sandro Sorbi
An early differentiation between Alzheimer's Disease (AD) and other dementias is crucial for an adequate patients' management, albeit it may result difficult for the occurrence of "atypical presentations." Current diagnostic criteria recognize the importance of biomarkers for AD diagnosis, but still an optimal diagnostic work-up isn't available. Evaluate the utility and reproducibility of biomarkers and propose an "optimal" diagnostic work-up in atypical dementia: (1) a retrospective selection of "atypical dementia cases"; (2) a repetition of diagnostic assessment by two neurologists following two different diagnostic work-ups, each consisting of multiple steps; (3) a comparison between diagnostic accuracy and confidence reached at each step by both neurologists and evaluation of the inter-rater agreement...
April 13, 2018: Neurological Sciences
https://www.readbyqxmd.com/read/29649488/proteomics-based-identification-of-differential-plasma-proteins-and-changes-in-white-matter-integrity-as-markers-in-early-detection-of-mild-cognitive-impaired-subjects-at-high-risk-of-alzheimer-s-disease
#15
Abhai Kumar, Smita Singh, Ashish Verma, Vijay Nath Mishra
Mild cognitive impairment (MCI) is an intermediate stage of cognitive decline and dementia. The absence of specific diagnostic test for identification of MCI and AD. The current study aims to find proteomics based change in plasma proteins and diffusion tensor imaging (DTI) based white matter changes in MCI for early detection of prodromal Alzheimer's disease. Fifty cases of mild cognitive impairment and age matched control between (55-75 yrs) were screened on basis of Mini Mental State Examination (MMSE). Two dimensional gel electrophoresis and DTI imaging was performed in MCI and age matched control...
April 9, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29643688/simultaneous-18f-fdg-pet-mri-in-autoimmune-limbic-encephalitis
#16
Sangeeta Taneja, Vinit Suri, Aashim Ahuja, Amarnath Jena
Limbic encephalitis is an autoimmune disorder characterized by inflammation of the brain with rapidly progressing dementia which requires definitive neurological evaluation. We describe both clinical as well as imaging findings in a case of limbic encephalitis using positron emission tomography/magnetic resonance imaging.
April 2018: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/29643322/metabolically-healthy-obesity-and-risk-of-leukoaraiosis-a-population-based-cross-sectional-study
#17
Takuro Okamura, Yoshitaka Hashimoto, Masahide Hamaguchi, Akihiro Ohbora, Takao Kojima, Michiaki Fukui
Metabolically healthy obese (MHO) individual is known to be defended from the metabolic complications of obesity. Leukoaraiosis, which is commonly detected on brain magnetic resonance imaging (MRI), is now recognized as a risk of stroke, dementia and death. However, the association between MHO and the prevalence of leukoaraiosis is unclear. In this cross-sectional study of 796 participants who received a medical examination program, we investigated the association between MHO and the prevalence of leukoaraiosis...
April 10, 2018: Endocrine Journal
https://www.readbyqxmd.com/read/29629498/multifocal-alterations-of-white-matter-accompany-the-transition-from-normal-cognition-to-dementia-in-parkinson-s-disease-patients
#18
Maria Chondrogiorgi, Loukas G Astrakas, Anastasia K Zikou, Luca Weis, Vassilios G Xydis, Angelo Antonini, Maria I Argyropoulou, Spiridon Konitsiotis
The purpose of the present study was to investigate the pattern of white matter (WM) changes associated with Parkinson's disease (PD)-related cognitive impairment by using fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD) and radial diffusivity (RD) measures. Diffusion Tensor Imaging (DTI) was performed in 21 PD-patients with dementia (PDD) and in an age-matched control group including 40 PD-patients without dementia (PD-CTRL). The Parkinson's disease-Cognitive Rating Scale (PD-CRS) was used for patients' neuropsychological assessment...
April 9, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29628321/association-of-hippocampal-substructure-resting-state-functional-connectivity-with-memory-performance-in-older-adults
#19
Stephen F Smagula, Helmet T Karim, Anusha Rangarajan, Fernando Pasquini Santos, Sossena C Wood, Tales Santini, John M Jakicic, Charles F Reynolds, Judy L Cameron, Abbe N Vallejo, Meryl A Butters, Caterina Rosano, Tamer S Ibrahim, Kirk I Erickson, Howard J Aizenstein
OBJECTIVES: Hippocampal hyperactivation marks preclinical dementia pathophysiology, potentially due to differences in the connectivity of specific medial temporal lobe structures. Our aims were to characterize the resting-state functional connectivity of medial temporal lobe sub-structures in older adults, and evaluate whether specific substructural (rather than global) functional connectivity relates to memory function. METHODS: In 15 adults (mean age: 69 years), we evaluated the resting state functional connectivity of medial temporal lobe substructures: dentate/Cornu Ammonis (CA) 4, CA1, CA2/3, subiculum, the molecular layer, entorhinal cortex, and parahippocampus...
March 13, 2018: American Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/29626426/plasma-phospho-tau181-increases-with-alzheimer-s-disease-clinical-severity-and-is-associated-with-tau-and-amyloid-positron-emission-tomography
#20
Michelle M Mielke, Clinton E Hagen, Jing Xu, Xiyun Chai, Prashanthi Vemuri, Val J Lowe, David C Airey, David S Knopman, Rosebud O Roberts, Mary M Machulda, Clifford R Jack, Ronald C Petersen, Jeffrey L Dage
INTRODUCTION: We examined and compared plasma phospho-tau181 (pTau181) and total tau: (1) across the Alzheimer's disease (AD) clinical spectrum; (2) in relation to brain amyloid β (Aβ) positron emission tomography (PET), tau PET, and cortical thickness; and (3) as a screening tool for elevated brain Aβ. METHODS: Participants included 172 cognitively unimpaired, 57 mild cognitively impaired, and 40 AD dementia patients with concurrent Aβ PET (Pittsburgh compound B), tau PET (AV1451), magnetic resonance imaging, plasma total tau, and pTau181...
April 4, 2018: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
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