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https://www.readbyqxmd.com/read/29040871/gray-matter-networks-and-clinical-progression-in-subjects-with-predementia-alzheimer-s-disease
#1
Betty M Tijms, Mara Ten Kate, Alida A Gouw, Andreas Borta, Sander Verfaillie, Charlotte E Teunissen, Philip Scheltens, Frederik Barkhof, Wiesje M van der Flier
We studied whether gray matter network parameters are associated with rate of clinical progression in nondemented subjects who have abnormal amyloid markers in the cerebrospinal fluid (CSF), that is, predementia Alzheimer's disease. Nondemented subjects (62 with subjective cognitive decline; 160 with mild cognitive impairment (MCI); age = 68 ± 8 years; Mini-Mental State Examination (MMSE) = 28 ± 2.4) were selected from the Amsterdam Dementia Cohort when they had abnormal amyloid in CSF (<640 pg/mL)...
September 20, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/29036824/alzheimer-s-disease-biomarkers-and-future-decline-in-cognitive-normal-older-adults
#2
Julien Dumurgier, Bernard J Hanseeuw, Frances B Hatling, Kelly A Judge, Aaron P Schultz, Jasmeer P Chhatwal, Deborah Blacker, Reisa A Sperling, Keith A Johnson, Bradley T Hyman, Teresa Gómez-Isla
BACKGROUND: Identifying older adults at risk of cognitive decline represents a challenge as Alzheimer's disease (AD) modifying therapies move toward preclinical stages. OBJECTIVE: To investigate the relationship between AD biomarkers and subsequent change in cognition in a cohort of cognitively intact older adults. METHODS: 84 cognitively normal subjects (mean age 72.0 years, 59% women) were recruited through the Massachusetts Alzheimer's Disease Research Center and the Harvard Aging Brain Study and followed over 3 years...
October 12, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29036822/cortical-cerebral-microinfarcts-on-3-tesla-mri-in-patients-with-vascular-cognitive-impairment
#3
Doeschka A Ferro, Susanne J van Veluw, Huiberdina L Koek, Lieza G Exalto, Geert Jan Biessels
BACKGROUND: Cerebral microinfarcts (CMIs) are small ischemic lesions that are a common neuropathological finding in patients with stroke or dementia. CMIs in the cortex can now be detected in vivo on 3 Tesla MRI. OBJECTIVE: To determine the occurrence of CMIs and associated clinical features in patients with possible vascular cognitive impairment (VCI). METHOD: 182 memory-clinic patients (mean age 71.4±10.6, 55% male) with vascular injury on brain MRI (i...
October 12, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29036811/sildenafil-improves-vascular-and-metabolic-function-in-patients-with-alzheimer-s-disease
#4
Min Sheng, Hanzhang Lu, Peiying Liu, Yang Li, Harshan Ravi, Shin-Lei Peng, Ramon Diaz-Arrastia, Michael D Devous, Kyle B Womack
BACKGROUND: Alzheimer's disease (AD) is the leading cause of degenerative dementia in the aging population. Patients with AD have alterations in cerebral hemodynamic function including reduced cerebral blood flow (CBF) and cerebral metabolic rate. Therefore, improved cerebrovascular function may be an attractive goal for pharmaceutical intervention in AD. OBJECTIVE: We wished to observe the acute effects of sildenafil on cerebrovascular function and brain metabolism in patients with AD...
October 7, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29036183/mri-assessed-atrophy-subtypes-in-alzheimer-s-disease-and-the-cognitive-reserve-hypothesis
#5
Karin Persson, Rannveig Sakshaug Eldholm, Maria Lage Barca, Lena Cavallin, Daniel Ferreira, Anne-Brita Knapskog, Geir Selbæk, Anne Brækhus, Ingvild Saltvedt, Eric Westman, Knut Engedal
BACKGROUND/AIMS: MRI assessment of the brain has demonstrated four different patterns of atrophy in patients with Alzheimer's disease dementia (AD): typical AD, limbic-predominant AD, hippocampal-sparing AD, and a subtype with minimal atrophy, previously referred to as no-atrophy AD. The aim of the present study was to identify and describe the differences between these four AD subtypes in a longitudinal memory-clinic study. METHODS: The medial temporal lobes, the frontal regions, and the posterior regions were assessed with MRI visual rating scales to categorize 123 patients with mild AD according to ICD-10 and NINCDS-ADRDA criteria and the clinical dementia rating scale (CDR) into atrophy subtypes...
2017: PloS One
https://www.readbyqxmd.com/read/29034421/hippocampal-deformations-and-entorhinal-cortex-atrophy-as-an-anatomical-signature-of-long-term-cognitive-impairment-from-the-mcao-rat-model-to-the-stroke-patient
#6
C Delattre, C Bournonville, F Auger, R Lopes, C Delmaire, H Henon, A M Mendyk, S Bombois, J C Devedjian, D Leys, C Cordonnier, R Bordet, M Bastide
Stroke patients have an elevated risk of developing long-term cognitive disorders or dementia. The latter is often associated with atrophy of the medial temporal lobe. However, it is not clear whether hippocampal and entorhinal cortex atrophy is the sole predictor of long-term post-stroke dementia. We hypothesized that hippocampal deformation (rather than atrophy) is a predictive marker of long-term post-stroke dementia on a rat model and tested this hypothesis in a prospective cohort of stroke patients.Male Wistar rats were subjected to transient middle cerebral artery occlusion and assessed 6 months later...
October 16, 2017: Translational Stroke Research
https://www.readbyqxmd.com/read/29032192/age-dependent-association-of-thyroid-function-with-brain-morphology-and-microstructural-organization-evidence-from-brain-imaging
#7
Layal Chaker, Lotte G M Cremers, Tim I M Korevaar, Marius de Groot, Abbas Dehghan, Oscar H Franco, Wiro J Niessen, M Arfan Ikram, Robin P Peeters, Meike W Vernooij
Thyroid hormone (TH) is crucial during neurodevelopment, but high levels of TH have been linked to neurodegenerative disorders. No data on the association of thyroid function with brain imaging in the general population are available. We therefore investigated the association of thyroid-stimulating hormone and free thyroxine (FT4) with magnetic resonance imaging (MRI)-derived total intracranial volume, brain tissue volumes, and diffusion tensor imaging measures of white matter microstructure in 4683 dementia- and stroke-free participants (mean age 60...
September 22, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/29030451/weighting-and-standardization-of-frequencies-to-determine-prevalence-of-ad-imaging-biomarkers
#8
Rosebud O Roberts, David S Knopman, Jeremy A Syrjanen, Jeremiah A Aakre, Maria Vassilaki, Walter K Kremers, Michelle M Mielke, Mary M Machulda, Jonathan Graff-Radford, Yonas E Geda, Prashanthi Vemuri, Val Lowe, Clifford R Jack, Ronald C Petersen
OBJECTIVE: To estimate the prevalence of elevated brain amyloid and reduced cortical thickness (as a marker for neurodegeneration) in a defined population. METHODS: Mayo Clinic Study of Aging participants underwent MRI to assess a composite Alzheimer disease (AD) signature cortical thickness measure and PET to assess brain amyloid accumulation. Participants were characterized as having elevated amyloid (A+/A-), reduced cortical thickness (N+/N-), and A+N+, A+N-, A-N+, or A-N-...
October 13, 2017: Neurology
https://www.readbyqxmd.com/read/29026896/tau-and-pet-mri-imaging-biomarkers-for-detecting-and-diagnosing-early-dementia
#9
Yongxia Zhou, Bing Bai
Specific objective of this project is to quantify the neuropathological tau depositions in brain regions and to investigate primary age-related tau pathology and associations with amyloid and glucose-metabolism, neurocognitive tests and MRI metrics. Preliminary results demonstrated higher temporal deposition especially in the hippocampus and the inferior temporal regions compared to mean cortical deposition. Quantitative Braak stage-based regional analyses found highest tau deposition in the Braak stage II in the preclinical samples...
July 2017: Jacobs Journal of Medical Diagnosis and Medical Imaging
https://www.readbyqxmd.com/read/29018162/clinical-utility-of-amyloid-pet-imaging-with-18-f-florbetapir-a-retrospective-study-of-100-patients
#10
Christopher James Carswell, Zarni Win, Kirsty Muckle, Angus Kennedy, Adam Waldman, Gemma Dawe, Tara D Barwick, Sameer Khan, Paresh A Malhotra, Richard J Perry
BACKGROUND AND OBJECTIVE: Amyloid-positron emission tomography (PET) imaging (API) detects amyloid-beta pathology early in the course of Alzheimer's disease (AD) with high sensitivity and specificity. (18)F-florbetapir (Amyvid) is an amyloid-binding PET ligand with a half-life suitable for clinical use outside of the research setting. How API affects patient investigation and management in the 'real-world' arena is unknown. To address this, we retrospectively documented the effect of API in patients in the memory clinic...
October 10, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28993708/body-mass-index-is-associated-with-cortical-thinning-with-different-patterns-in-mid-and-late-life
#11
M E Shaw, P S Sachdev, W Abhayaratna, K J Anstey, N Cherbuin
OBJECTIVE: High BMI at midlife is associated with increased risk of dementia as well as faster decline in cognitive function. In late-life, however, high BMI has been found to be associated with both increased and decreased dementia risk. The objective of this study was to investigate the neural substrates of this age-related change in BMI risk. METHODS: We measured longitudinal cortical thinning over the whole brain, based on MRI scans for 910 individuals aged 44 to 66 years at baseline...
October 10, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28984608/damage-to-the-frontal-aslant-tract-accounts-for-visuo-constructive-deficits-in-alzheimer-s-disease
#12
Laura Serra, Giulia Bechi Gabrielli, Elisa Tuzzi, Barbara Spanò, Giovanni Giulietti, Virginia Failoni, Camillo Marra, Carlo Caltagirone, Giacomo Koch, Mara Cercignani, Marco Bozzali
The frontal aslant tract (FAT) has been described as a bundle connecting the Broca's area to the supplementary motor area (SMA) and the pre-SMA in both hemispheres. The functional properties of this tract and its role in degenerative dementia, such as Alzheimer's disease (AD), still need to be fully clarified. The aim of this study was to explore the microstructural integrity of the FAT in patients with AD and its potential relationship with cognitive functioning. Twenty-three patients with AD and 25 healthy subjects (HS) were enrolled...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28984600/plasma-amyloid-%C3%AE-levels-cerebral-small-vessel-disease-and-cognition-the-rotterdam-study
#13
Saima Hilal, Saloua Akoudad, Cornelia M van Duijn, Wiro J Niessen, Marcel M Verbeek, Hugo Vanderstichele, Erik Stoops, M Arfan Ikram, Meike W Vernooij
BACKGROUND: Plasma amyloid-β (Aβ) levels are increasingly studied as a potential, accessible marker of cognitive impairment and dementia. The most common plasma Aβ isoforms, i.e., Aβ1-40 and Aβ1-42 have been linked with risk of Alzheimer's disease. However, it remains under-explored whether plasma Aβ levels including novel Aβ1-38 relate to vascular brain disease and cognition in a preclinical-phase of dementiaObjective:To examine the association of plasma Aβ levels (i.e., Aβ1-38, Aβ1-40, and Aβ1-42) with markers of cerebral small vessel disease (SVD) and cognition in a large population-based setting...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28984590/disinhibition-in-alzheimer-s-disease-is%C3%A2-associated-with-reduced-right-frontal-pole-cortical-thickness
#14
Elizabeth Finger, Jing Zhang, Bradford Dickerson, Yves Bureau, Mario Masellis
Neuropsychiatric symptoms in Alzheimer's disease are among the most disabling and difficult aspects for caregivers and treating health professionals to manage. Despite the high prevalence of these behaviors, little is known about the factors which lead some patients to develop florid behavioral symptoms while others may progress to severe dementia without such phenomenon. We examined whether regional brain volumes as measured by cortical thickness would predict the presence or absence of disinhibition in patients with Alzheimer's disease...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28984586/utility-of-molecular-and-structural-brain-imaging-to-predict-progression-from-mild-cognitive-impairment-to-dementia
#15
Martin J Lan, R Todd Ogden, Dileep Kumar, Yaakov Stern, Ramin V Parsey, Gregory H Pelton, Harry Rubin-Falcone, Gnanavalli Pradhaban, Francesca Zanderigo, Jeffrey M Miller, J John Mann, D P Devanand
This project compares three neuroimaging biomarkers to predict progression to dementia in subjects with mild cognitive impairment (MCI). Eighty-eight subjects with MCI and 40 healthy controls (HCs) were recruited. Subjects had a 3T magnetic resonance imaging (MRI) scan, and two positron emission tomography (PET) scans, one with Pittsburgh compound B ([11C]PIB) and one with fluorodeoxyglucose ([18F]FDG). MCI subjects were followed for up to 4 y and progression to dementia was assessed on an annual basis. MCI subjects had higher [11C]PIB binding potential (BPND) than HCs in multiple brain regions, and lower hippocampus volumes...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28978655/change-in-multimodal-mri-markers-predicts-dementia-risk-in-cerebral-small-vessel-disease
#16
Eva A Zeestraten, Andrew J Lawrence, Christian Lambert, Philip Benjamin, Rebecca L Brookes, Andrew D Mackinnon, Robin G Morris, Thomas R Barrick, Hugh S Markus
OBJECTIVE: To determine whether MRI markers, including diffusion tensor imaging (DTI), can predict cognitive decline and dementia in patients with cerebral small vessel disease (SVD). METHODS: In the prospective St George's Cognition and Neuroimaging in Stroke study, multimodal MRI was performed annually for 3 years and cognitive assessments annually for 5 years in a cohort of 99 patients with SVD, defined as symptomatic lacunar stroke and confluent white matter hyperintensities (WMH)...
October 4, 2017: Neurology
https://www.readbyqxmd.com/read/28969570/new-perspectives-of-alzheimer-disease-diagnosis-the-most-popular-and-future-methods
#17
Katarzyna Pietrzak, Kamila Czarnecka, Elżbieta M Ikiciuk-Olasik, Paweł Szymański
As lifespan tendency is increasing, age-related diseases are becoming a burden to the society and health care system. Mostly incurable, constitute a subject of researchers' work. In this review the insight into the problem of Alzheimer Disease (AD) diagnostics will be given. The unquestionable diagnosis is possible only during a post-mortem examination. AD is known as one of the forms of dementia and its differentiation from mild cognitive impairments has to be improved. Despite a great diagnostic progress during last decades, medicine still needs more accurate tools for an early detection of this incurable disease...
October 2, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/28969373/glymphatic-mri-in-idiopathic-normal-pressure-hydrocephalus
#18
Geir Ringstad, Svein Are Sirirud Vatnehol, Per Kristian Eide
The glymphatic system has in previous studies been shown as fundamental to clearance of waste metabolites from the brain interstitial space, and is proposed to be instrumental in normal ageing and brain pathology such as Alzheimer's disease and brain trauma. Assessment of glymphatic function using magnetic resonance imaging with intrathecal contrast agent as a cerebrospinal fluid tracer has so far been limited to rodents. We aimed to image cerebrospinal fluid flow characteristics and glymphatic function in humans, and applied the methodology in a prospective study of 15 idiopathic normal pressure hydrocephalus patients (mean age 71...
October 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28967811/clinical-findings-of-a-probable-case-of-mm2-cortical-type-sporadic-creutzfeldt-jakob-disease-with-antibodies-to-anti-n-terminus-of-%C3%AE-enolase
#19
Yuichi Hayashi, Megumi Yamada, Akio Kimura, Takahiko Asano, Katsuya Satoh, Tetsuyuki Kitamoto, Maokoto Yoneda, Takashi Inuzuka
We report the case of a 76-year-old woman presenting with 47-month history of progressive dementia and cortical blindness with no family history. Antibodies against thyroid glands and the N-terminus of α-enolase (NAE) were detected in her serum. Neurological examination revealed progressive dementia, frontal signs, visual disturbance, and exaggerated bilateral tendon reflexes in both legs. Diffusion MRI showed cortical hyper-intensities in the bilateral occipital and parietal, and the left frontal and temporal cortices...
October 2, 2017: Prion
https://www.readbyqxmd.com/read/28963056/hippocampus-dependent-spatial-learning-is-associated-with-higher-global-cognition-among-healthy-older-adults
#20
Kyoko Konishi, Sam Mckenzie, Nicole Etchamendy, Shumita Roy, Véronique D Bohbot
Cognitive deficits in normal aging have been associated with atrophy of the hippocampus. As such, methods to detect early dysfunction of the hippocampus have become valuable, if not indispensable, to early intervention. The hippocampus is critical for spatial memory and is among the first structures to atrophy with aging. Despite the presence of navigation deficits in aging, few studies have looked at the association between wayfinding ability, navigation strategies, general cognitive function, and hippocampal volume...
September 26, 2017: Neuropsychologia
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