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https://www.readbyqxmd.com/read/29334498/evidence-based-interpretation-of-amyloid-%C3%AE-pet-results-a-clinician-s-tool
#1
David Bergeron, Rik Ossenkoppele, Robert Jr Laforce
BACKGROUND: Amyloid-β positron emission tomography (PET) allows for in vivo detection of fibrillar amyloid plaques, a pathologic hallmark of Alzheimer's disease (AD). However, amyloid-β PET interpretation is limited by the imperfect correlation between PET and autopsy, and the fact that it is positive in about 20% to 30% of cognitively normal individuals and non-AD dementias, especially when older or carrying the ε4 allele of apolipoprotein E (ApoE4). When facing a positive amyloid PET, clinicians have to evaluate the probability of a pathologic false positive as well as the probability of amyloid positivity being age-related, comorbid to a primary non-AD dementia (clinicopathologic false positive)...
January 12, 2018: Alzheimer Disease and Associated Disorders
https://www.readbyqxmd.com/read/29333917/role-of-cortical-microbleeds-in-cognitive-impairment-in%C3%A2-vivo-behavioral-and-imaging-characterization-of-a-novel-murine-model
#2
Sandrine Bergeron, Yaohua Chen, Florent Auger, Julie Deguil, Nicolas Durieux, Emilie Skrobala, Romain Barus, Camille Potey, Charlotte Cordonnier, Florence Pasquier, Laura Ravasi, Régis Bordet, Sophie Gautier
Cerebral microbleeds (CMBs) could contribute to cognitive impairment in the general population and in patients with dementia. We designed a study to (i) develop a murine model of CMBs, (ii) assess whether CMBs affect cognition in this model and (iii) assess whether this model is sensitive to pharmacological modulation. Male C57Bl6/J mice were stereotactically administered collagenase to induce cortical lesion analysed by MRI at 24 h. CMB-mice were assessed at six weeks post-lesion for cognitive performances (Barnes maze and Touchscreen automated paired-associated learning (PAL) task) and for cerebral metabolism (in vivo PET/CT with fluorodeoxyglucose (FDG))...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29329059/amyloid-burden-and-incident-depressive-symptoms-in-preclinical-alzheimer-s-disease
#3
Stephanie Perin, Karra D Harrington, Yen Ying Lim, Kathryn Ellis, David Ames, Robert H Pietrzak, Adrian Schembri, Stephanie Rainey-Smith, Olivier Salvado, Simon M Laws, Ralph N Martins, Victor L Villemagne, Christopher C Rowe, Colin L Masters, Paul Maruff
BACKGROUND: Relationships between depression and Alzheimer's disease (AD) may become clearer if studied in preclinical AD where dementia is not present. METHOD: The aim of this study was to evaluate prospectively, relationships between brain amyloid-β (Aβ), depressive symptoms and screen positive depression in cognitively normal (CN) older adults. Depressive symptoms were measured with the Geriatric Depression Inventory (GDS-15) in CN adults from the Australian Imaging Biomarkers and Lifestyle (AIBL) study without depression at baseline and classified as having abnormally high (Aβ+; n = 136) or low (Aβ-; n = 449) Aβ according to positron emission tomography at 18-month intervals over 72 months...
January 3, 2018: Journal of Affective Disorders
https://www.readbyqxmd.com/read/29328983/social-and-cognitive-control-skills-in-long-life-occupation-activities-modulate-the-brain-reserve-in-the-behavioural-variant-of-frontotemporal-dementia
#4
Alessandra Dodich, Giulia Carli, Chiara Cerami, Sandro Iannaccone, Giuseppe Magnani, Daniela Perani
BACKGROUND: Cognitive reserve may delay disease onset and mitigate symptoms presentation in neurodegenerative dementias. Although high occupation levels can be associated with higher cognitive reserve in the behavioural variant of frontotemporal dementia (bvFTD), it was never addressed how specific occupation profiles involving social interaction, executive and attention abilities can modulate neural reserve in bvFTD. MATERIALS AND METHODS: We retrospectively included thirty-seven bvFTD patients with clinical-neuropsychological and FDG-PET brain metabolic data...
December 19, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29326356/cerebrospinal-fluid-hyposmia-and-dementia-in-alzheimer-disease-insights-from-dynamic-pet-and-a-hypothesis
#5
Ashwin Kumaria
No abstract text is available yet for this article.
January 11, 2018: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29321235/comparing-18f-av-1451-with-csf-t-tau-and-p-tau-for-diagnosis-of-alzheimer-disease
#6
Niklas Mattsson, Ruben Smith, Olof Strandberg, Sebastian Palmqvist, Michael Schöll, Philip S Insel, Douglas Hägerström, Tomas Ohlsson, Henrik Zetterberg, Kaj Blennow, Jonas Jögi, Oskar Hansson
OBJECTIVE: To compare PET imaging of tau pathology with CSF measurements (total tau [t-tau] and phosphorylated tau [p-tau]) in terms of diagnostic performance for Alzheimer disease (AD). METHODS: We compared t-tau and p-tau and 18F-AV-1451 in 30 controls, 14 patients with prodromal AD, and 39 patients with Alzheimer dementia, recruited from the Swedish BioFINDER study. All patients with AD (prodromal and dementia) were screened for amyloid positivity using CSF β-amyloid 42...
January 10, 2018: Neurology
https://www.readbyqxmd.com/read/29315563/kinetic-modeling-of-18-f-vat-a-novel-radioligand-for-pet-imaging-vesicular-acetylcholine-transporter-vacht-in-nonhuman-primate-brain
#7
Hongjun Jin, Xuyi Yue, Hui Liu, Junbin Han, Hubert Flores, Yi Su, Stanley M Parsons, Joel S Perlmutter, Zhude Tu
Molecular imaging of vesicular acetylcholine transporter (VAChT) in the brain provides an important cholinergic biomarker for the pathophysiology and treatment of dementias including Alzheimer's disease (AD). In this study, kinetics modeling methods were applied and compared for quantifying regional brain uptake of the VAChT-specific PET radiotracer, ((-)-(1-(-8-(2-fluoroethoxy)-3-hydroxy-1,2,3,4-tetrahydronaphthalen-2-yl)piperidin-4-yl)(4-fluorophenyl)-methanone) ([18 F]VAT) in macaques. Total volume distribution (VT ) estimates were compared for one-tissue compartment model (1TCM), two-tissue compartment model (2TCM), Logan graphic analysis (LoganAIF) and multiple linear analysis (MA1) with arterial blood input function using data from three macaques...
January 6, 2018: Journal of Neurochemistry
https://www.readbyqxmd.com/read/29276677/cross-sectional-variations-of-white-and-grey-matter-in-older-hypertensive-patients-with-subjective-memory-complaints
#8
Ahmed Chetouani, Mohammad B Chawki, Gabriela Hossu, Anna Kearney-Schwartz, Florence Chauveau-Beuret, Serge Bracard, Veronique Roch, Vincent Lebon, Pierre-Yves Marie, Athanase Benetos, Laure Joly, Antoine Verger
Mild cognitive impairment and Alzheimer's dementia involve a grey matter disease, quantifiable by 18F-Fluorodeoxyglucose positron emission tomography (FDG-PET), but also white matter damage, evidenced by diffusion tensor magnetic resonance imaging (DTI), which may play an additional pathogenic role. This study aimed to determine whether such DTI and PET variations are also interrelated in a high-risk population of older hypertensive patients with only subjective memory complaints (SMC). Sixty older hypertensive patients (75 ± 5 years) with SMC were referred to DTI and FDG-PET brain imaging, executive and memory tests, as well as peripheral and central blood pressure (BP) measurements...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29274595/florbetapir-pet-%C3%AE-amyloid-imaging-and-associated-neuropsychological-trajectories-in-survivors-of-critical-illness-a-case-series
#9
James C Jackson, Hillary J Warrington, Robert Kessler, Amy L Kiehl, E Wesley Ely
PURPOSE: Cognitive impairment resembling Alzheimer's disease is common in survivors of critical illness. We hypothesized that Intensive Care Unit (ICU) survivors with cognitive impairment would have significant amyloid and designed a pilot study to explore this relationship. MATERIALS AND METHODS: A pilot, case series of a convenience sample of 14 adult medical and surgical ICU survivors, in a clinical neuroradiology clinic. Patients underwent cognitive testing at 3months, 1year, 4years, and 6years after hospital discharge with the Repeatable Battery for the Assessment of Neuropsychological Status...
October 19, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/29273694/case-study-fdg-and-amyloid-pet-in-dementia
#10
Lance Burrell, Dawn Holley
We present a case of memory loss and aphasia in a 72-y-old male, and discuss how PET imaging supported a diagnosis of Alzheimer's dementia despite conflicting clinical findings.
December 22, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/29262393/-clinical-applications-of-positron-emission-tomography-for-neurosurgery-5-application-of-positron-emission-tomography-molecular-imaging-in-the-diagnosis-of-dementia-diseases
#11
https://www.readbyqxmd.com/read/29261640/the-added-value-of-dynamic-18f-florbetapir-pet-in-the-assessment-of-dementia-with-lewy-bodies
#12
Diego Alfonso López Mora, Valle Camacho, Alberto Lleó, Alejandro Fernández, Ignasi Carrió
Dementia with Lewy bodies (DLB) is the most common cause of dementia after Alzheimer disease. It is often underdiagnosed because of the overlapping with Alzheimer disease symptoms. We report the F-FDG and F-florbetapir dynamic PET images (early and delay phases) of an 83-year-old woman with cognitive impairment associated with visual hallucinations and parkinsonism due to probable DLB. This image highlights that the early phases of F-florbetapir may reflect regional cerebral perfusion with a pattern very similar to that of regional glucose metabolism in DLB...
December 19, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/29249679/cognitive-profile-and-18f-fluorodeoxyglucose-pet-study-in-lrrk2-related-parkinson-s-disease
#13
Anna De Rosa, Silvio Peluso, Natascia De Lucia, Paola Russo, Ida Annarumma, Marcello Esposito, Fiore Manganelli, Arturo Brunetti, Giuseppe De Michele, Sabina Pappatà
INTRODUCTION: LRRK2 gene mutations underlie the most common mendelian form of Parkinson's Disease (PD), designated PARK8, that shows clinical features similar to those in idiopathic PD (IPD). We assessed the cognitive functions and the cerebral metabolism measured with 18F-fluorodeoxyglucose (FDG)-PET in PARK8 patients compared with IPD. PATIENTS AND METHODS: We enrolled eight PARK8 patients and eight IPD patients, comparable for onset age, stage, severity and duration of disease...
December 9, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/29232244/-occipital-tunnel-sign-on-fdg-pet-for-differentiating-dementias
#14
David M Sawyer, Phillip H Kuo
PET using FDG is a critical tool for evaluation of dementias, with characteristic patterns of hypometabolism suggesting specific diagnoses. Hypometabolism in the occipital region is recognized as an important finding associated with dementia with Lewy bodies and posterior cortical atrophy. We describe here the novel "occipital tunnel" sign, which results from relative sparing of FDG uptake in the medial occipital (primary visual) cortex compared with more severe loss in the surrounding lateral occipital (visual association) cortex...
December 11, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/29228201/widespread-brain-tau-and-its-association-with-ageing-braak-stage-and-alzheimer-s-dementia
#15
Val J Lowe, Heather J Wiste, Matthew L Senjem, Stephen D Weigand, Terry M Therneau, Bradley F Boeve, Keith A Josephs, Ping Fang, Mukesh K Pandey, Melissa E Murray, Kejal Kantarci, David T Jones, Prashanthi Vemuri, Jonathan Graff-Radford, Christopher G Schwarz, Mary M Machulda, Michelle M Mielke, Rosebud O Roberts, David S Knopman, Ronald C Petersen, Clifford R Jack
Autopsy data have proposed that a topographical pattern of tauopathy occurs in the brain with the development of dementia due to Alzheimer's disease. We evaluated the findings of tau-PET to better understand neurofibrillary tangle development as it is seen in cognitively unimpaired and impaired individuals. The evolution of Alzheimer's disease tauopathy in cognitively unimpaired individuals needs to be examined to better understand disease pathogenesis. Tau-PET was performed in 86 cognitively impaired individuals who all had abnormal amyloid levels and 601 cognitively unimpaired individuals...
December 8, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29228071/associations-between-tau-%C3%AE-amyloid-and-cognition-in-parkinson-disease
#16
Joseph R Winer, Anne Maass, Peter Pressman, Jordan Stiver, Daniel R Schonhaut, Suzanne L Baker, Joel Kramer, Gil D Rabinovici, William J Jagust
Importance: Multiple disease processes are associated with cognitive impairment in Parkinson disease (PD), including Lewy bodies, cerebrovascular disease, and Alzheimer disease. It remains unknown whether tau pathology relates to cognition in patients with PD without dementia. Objective: To compare tau aggregation in patients with PD who are cognitively normal (PD-CN), patients with PD with mild cognitive impairment (PD-MCI), and healthy control participants, and evaluate the relationships between β-amyloid (Aβ), tau, and cognition in patients with PD who did not have dementia...
December 11, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/29226866/11c-cft-pet-in-presymptomatic-ftdp-17-a-potential-biomarker-predicting-onset
#17
Liyong Wu, Jia Liu, Xueyan Feng, Jing Dong, Wei Qin, Yang Liu, Jingjuan Wang, Jie Lu, Kewei Chen, Yuping Wang, Jianping Jia
Frontotemporal dementia with parkinsonism-linked to chromosome 17 (FTDP-17) is a rare autosomal dominant neurodegenerative disorder. Most patients with FTDP-17 carry the mutation in the microtubule-associated protein tau (MAPT) gene. Striatum is predominantly and early affected in FTDP-17. Five family members (two symptomatic patients and three presymptomatic mutation carriers) from a Chinese pedigree of FTDP-17 with N279K mutation in MAPT were enrolled. Parkinsonism was the initial symptom for symptomatic patients...
December 6, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29222591/dementia-with-lewy-bodies-and-parkinson-s-disease-dementia-current-concepts-and-controversies
#18
REVIEW
Kurt A Jellinger
Dementia with Lewy bodies (DLB) and Parkinson's disease-dementia (PDD), although sharing many clinical, neurochemical and morphological features, according to DSM-5, are two entities of major neurocognitive disorders with Lewy bodies of unknown etiology. Despite considerable clinical overlap, their diagnosis is based on an arbitrary distinction between the time of onset of motor and cognitive symptoms: dementia often preceding parkinsonism in DLB and onset of cognitive impairment after onset of motor symptoms in PDD...
December 8, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/29221491/a-phase-iii-randomized-trial-of-gantenerumab-in-prodromal-alzheimer-s-disease
#19
Susanne Ostrowitzki, Robert A Lasser, Ernest Dorflinger, Philip Scheltens, Frederik Barkhof, Tania Nikolcheva, Elizabeth Ashford, Sylvie Retout, Carsten Hofmann, Paul Delmar, Gregory Klein, Mirjana Andjelkovic, Bruno Dubois, Mercè Boada, Kaj Blennow, Luca Santarelli, Paulo Fontoura
BACKGROUND: Gantenerumab is a fully human monoclonal antibody that binds aggregated amyloid-β (Aβ) and removes Aβ plaques by Fc receptor-mediated phagocytosis. In the SCarlet RoAD trial, we assessed the efficacy and safety of gantenerumab in prodromal Alzheimer's disease (AD). METHODS: In this randomized, double-blind, placebo-controlled phase III study, we investigated gantenerumab over 2 years. Patients were randomized to gantenerumab 105 mg or 225 mg or placebo every 4 weeks by subcutaneous injection...
December 8, 2017: Alzheimer's Research & Therapy
https://www.readbyqxmd.com/read/29209391/korean-brain-aging-study-for-the-early-diagnosis-and-prediction-of-alzheimer-s-disease-methodology-and-baseline-sample-characteristics
#20
Min Soo Byun, Dahyun Yi, Jun Ho Lee, Young Min Choe, Bo Kyung Sohn, Jun-Young Lee, Hyo Jung Choi, Hyewon Baek, Yu Kyeong Kim, Yun-Sang Lee, Chul-Ho Sohn, Inhee Mook-Jung, Murim Choi, Yu Jin Lee, Dong Woo Lee, Seung-Ho Ryu, Shin Gyeom Kim, Jee Wook Kim, Jong Inn Woo, Dong Young Lee
Objective: The Korean Brain Aging Study for the Early Diagnosis and Prediction of Alzheimer's disease (KBASE) aimed to recruit 650 individuals, aged from 20 to 90 years, to search for new biomarkers of Alzheimer's disease (AD) and to investigate how multi-faceted lifetime experiences and bodily changes contribute to the brain changes or brain pathologies related to the AD process. Methods: All participants received comprehensive clinical and neuropsychological evaluations, multi-modal brain imaging, including magnetic resonance imaging, magnetic resonance angiography, [11C]Pittsburgh compound B-positron emission tomography (PET), and [18F]fluorodeoxyglucose-PET, blood and genetic marker analyses at baseline, and a subset of participants underwent actigraph monitoring and completed a sleep diary...
November 2017: Psychiatry Investigation
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