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https://www.readbyqxmd.com/read/28733959/increasing-precision-of-clinical-diagnosis-of-alzheimer-s-disease-using-a-combined-algorithm-incorporating-clinical-and-novel-biomarker-data
#1
REVIEW
Marwan N Sabbagh, Lih-Fen Lue, Daniel Fayard, Jiong Shi
Establishing the in vivo diagnosis of Alzheimer's disease (AD) or other dementias relies on clinical criteria; however, the accuracy of these criteria can be limited. The diagnostic accuracy is 77% for a clinical diagnosis of AD, even among experts. We performed a review through PubMed of articles related to specific diagnostic modalities, including APOE genotyping, cerebrospinal fluid (CSF) testing, fludeoxyglucose F 18 positron emission tomography (PET), amyloid PET, tau PET, computed tomography (CT), single-photon emission CT, magnetic resonance imaging (MRI), and B12 and thyroid-stimulating hormone screening, to determine the specificity and sensitivity of each test used in the clinical diagnosis of AD...
July 2017: Neurology and Therapy
https://www.readbyqxmd.com/read/28733335/motor-speech-signature-of-behavioral-variant-frontotemporal-dementia-refining-the-phenotype
#2
Adam P Vogel, Matthew L Poole, Hugh Pemberton, Marja W J Caverlé, Frederique M C Boonstra, Essie Low, David Darby, Amy Brodtmann
OBJECTIVE: To provide a comprehensive description of motor speech function in behavioral variant frontotemporal dementia (bvFTD). METHODS: Forty-eight individuals (24 bvFTD and 24 age- and sex-matched healthy controls) provided speech samples. These varied in complexity and thus cognitive demand. Their language was assessed using the Progressive Aphasia Language Scale and verbal fluency tasks. Speech was analyzed perceptually to describe the nature of deficits and acoustically to quantify differences between patients with bvFTD and healthy controls...
July 21, 2017: Neurology
https://www.readbyqxmd.com/read/28724588/automatic-measurement-of-prosody-in-behavioral-variant-ftd
#3
Naomi Nevler, Sharon Ash, Charles Jester, David J Irwin, Mark Liberman, Murray Grossman
OBJECTIVE: To help understand speech changes in behavioral variant frontotemporal dementia (bvFTD), we developed and implemented automatic methods of speech analysis for quantification of prosody, and evaluated clinical and anatomical correlations. METHODS: We analyzed semi-structured, digitized speech samples from 32 patients with bvFTD (21 male, mean age 63 ± 8.5, mean disease duration 4 ± 3.1 years) and 17 matched healthy controls (HC). We automatically extracted fundamental frequency (f0, the physical property of sound most closely correlating with perceived pitch) and computed pitch range on a logarithmic scale (semitone) that controls for individual and sex differences...
July 19, 2017: Neurology
https://www.readbyqxmd.com/read/28716371/detection-risk-factors-and-functional-consequences-of-cerebral-microinfarcts
#4
REVIEW
Susanne J van Veluw, Andy Y Shih, Eric E Smith, Christopher Chen, Julie A Schneider, Joanna M Wardlaw, Steven M Greenberg, Geert Jan Biessels
Cerebral microinfarcts are small lesions that are presumed to be ischaemic. Despite the small size of these lesions, affected individuals can have hundreds to thousands of cerebral microinfarcts, which cause measurable disruption to structural brain connections, and are associated with dementia that is independent of Alzheimer's disease pathology or larger infarcts (ie, lacunar infarcts, and large cortical and non-lacunar subcortical infarcts). Substantial progress has been made with regard to understanding risk factors and functional consequences of cerebral microinfarcts, partly driven by new in-vivo detection methods and the development of animal models that closely mimic multiple aspects of cerebral microinfarcts in human beings...
July 14, 2017: Lancet Neurology
https://www.readbyqxmd.com/read/28716257/associations-between-white-matter-hyperintensities-and-cognitive-decline-over-three-years-in-non-dementia-older-adults-with-memory-complaints
#5
So Young Moon, Philipe de Souto Barreto, Marie Chupin, Jean François Mangin, Ali Bouyahia, Ludovic Fillon, Sandrine Andrieu, Bruno Vellas
We investigated whether the baseline level and overtime changes of white matter hyperintensities (WMH) would be associated with cognitive decline over three years in non-demented older adults with memory complaints. 109 participants with baseline magnetic resonance imaging (MRI) and follow-up cognitive assessments up to 3-year were included; among them, 82 also had a follow-up MRI assessment over three years. WMH volume was obtained by an automated segmentation algorithm. Baseline WMH volumes and change between baseline and follow-up WMH were related to cognitive scores over time using mixed-effect linear regressions...
August 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28715552/large-perivascular-spaces-visible-on-magnetic-resonance-imaging-cerebral-small-vessel-disease-progression-and-risk-of-dementia-the-age-gene-environment-susceptibility-reykjavik-study
#6
Jie Ding, Sigurður Sigurðsson, Pálmi V Jónsson, Gudny Eiriksdottir, Andreas Charidimou, Oscar L Lopez, Mark A van Buchem, Vilmundur Guðnason, Lenore J Launer
Importance: With advancing age, an increased visibility of perivascular spaces (PVSs) on magnetic resonance imaging (MRI) is hypothesized to represent impaired drainage of interstitial fluid from the brain and may reflect underlying cerebral small vessel disease (SVD). However, whether large perivascular spaces (L-PVSs) (>3 mm in diameter) visible on MRI are associated with SVD and cognitive deterioration in older individuals is unknown. Objective: To examine whether L-PVSs are associated with the progression of the established MRI markers of SVD, cognitive decline, and increased risk of dementia...
July 17, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28714429/structural-brain-correlations-of-visuospatial-and-visuoperceptual-tests-in-parkinson-s-disease
#7
Anna Isabel Garcia-Diaz, Barbara Segura, Hugo Cesar Baggio, Maria Jose Marti, Francesc Valldeoriola, Yaroslau Compta, Nuria Bargallo, Carme Uribe, Anna Campabadal, Alexandra Abos, Carme Junque
BACKGROUND: Diagnosis of mild cognitive impairment in Parkinson's disease (PD) is relevant because it is a marker for evolution to dementia. However, the selection of suitable tests to evaluate separate cognitive domains in mild cognitive impairment related to PD remains an open question. The current work aims to investigate the neuroanatomical correlates of several visuospatial/visuoperceptual tests using the same sample and a multimodal MRI approach. METHODS: The study included 36 PD patients and 20 healthy subjects matched for age, sex, and education...
July 17, 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/28710667/parkinson-s-disease-with-mild-cognitive-impairment-severe-cortical-thinning-antedates-dementia
#8
Carmen Gasca-Salas, Daniel García-Lorenzo, David Garcia-Garcia, Pedro Clavero, José A Obeso, Stephane Lehericy, María C Rodríguez-Oroz
Mild cognitive impairment (MCI) in Parkinson's disease (PD) is a risk factor for dementia and thus, it is of interest to elucidate if specific patterns of atrophy in PD-MCI patients are associated with a higher risk of developing dementia. We aim to define pattern(s) of regional atrophy in PD-MCI patients who developed dementia during 31 months of follow-up using cortical thickness analysis Twenty-three PD-MCI patients and 18 controls underwent brain MRI and completed a neuropsychological examination at baseline, PD-MCI patients were followed after a 31 month follow-up in order to assess their progression to dementia...
July 14, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28709046/ankle-brachial-index-mri-markers-and-cognition-the-epidemiology-of-dementia-in-singapore-study
#9
Muhammad Amin Shaik, Narayanaswamy Venketasubramanian, Ching-Yu Cheng, Tien Yin Wong, Henri Vrooman, Mohammad Kamran Ikram, Saima Hilal, Christopher Chen
BACKGROUND AND AIMS: Previous studies showed an independent association of low ankle-brachial index (ABI) with cognitive impairment. However, the association between low ABI and cognition in the presence of both cerebrovascular disease (CeVD) and neurodegeneration is lacking. We aimed at investigating a) the association of low ABI with markers of CeVD and cortical thickness, and b) whether the association of low ABI with cognition is influenced by these markers. METHODS: Data was drawn from the Epidemiology of Dementia In Singapore (EDIS) study where all participants (n = 832) underwent neuropsychological tests and 3T brain magnetic resonance imaging (MRI) to assess CeVD markers as well as cortical thicknesses...
July 5, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28708110/cognitive-changes-in-the-spinocerebellar-ataxias-due-to-expanded-polyglutamine-tracts-a-survey-of-the-literature
#10
REVIEW
Evelyn Lindsay, Elsdon Storey
The dominantly-inherited ataxias characterised by expanded polyglutamine tracts-spinocere bellar ataxias (SCAs) 1, 2, 3, 6, 7, 17, dentatorubral pallidoluysian atrophy (DRPLA) and, in part, SCA 8-have all been shown to result in various degrees of cognitive impairment. We survey the literature on the cognitive consequences of each disorder, attempting correlation with their published neuropathological, magnetic resonance imaging (MRI) and clinical features. We suggest several psychometric instruments for assessment of executive function, whose results are unlikely to be confounded by visual, articulatory or upper limb motor difficulties...
July 14, 2017: Brain Sciences
https://www.readbyqxmd.com/read/28707717/an-autopsied-case-of-corticobasal-degeneration-presenting-with-frontotemporal-dementia-followed-by-myoclonus
#11
Yasushi Iwasaki, Keiko Mori, Masumi Ito, Maya Mimuro, Mari Yoshida
A Japanese woman developed frontotemporal dementia (FTD)-like symptoms of abnormal behavior, such as stereotyped behavior and disinhibition. The patient developed these symptoms at the age of 59 years, although aphasia symptoms were not apparent at early disease stages. Progressive parkinsonism was dominant on the left side, and conspicuous myoclonus was recognized in the late disease stage. MRI indicated severe, right side-dominant frontotemporal lobe atrophy with white matter degeneration. Brainstem and cerebellar atrophy were also observed...
July 14, 2017: Neuropathology: Official Journal of the Japanese Society of Neuropathology
https://www.readbyqxmd.com/read/28707338/evaluation-of-interthalamic-adhesion-size-as-an-indicator-of-brain-atrophy-in-dogs-with-and-without-cognitive-dysfunction
#12
Daji Noh, Sooyoung Choi, Hojung Choi, Youngwon Lee, Kija Lee
Interthalamic adhesion thickness has been previously described as a parameter for quantifying canine brain atrophy and hypothesized to correlate with brain height or ventricular size. However, studies testing this hypothesis are lacking. This retrospective cross-sectional study aimed to compare interthalamic adhesion thickness, interthalamic adhesion thickness/brain height ratio, and interthalamic adhesion thickness/brain height ratio/lateral ventricle to brain height ratio values in dogs with and without cognitive dysfunction...
July 13, 2017: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/28705819/mri-of-the-swallow-tail-sign-a-useful-marker-in-the-diagnosis-of-lewy-body-dementia
#13
S Shams, D Fällmar, S Schwarz, L-O Wahlund, D van Westen, O Hansson, E-M Larsson, S Haller
BACKGROUND AND PURPOSE: There are, to date, no MR imaging diagnostic markers for Lewy body dementia. Nigrosome 1, containing dopaminergic cells, in the substantia nigra pars compacta is hyperintense on SWI and has been called the swallow tail sign, disappearing with Parkinson disease. We aimed to study the swallow tail sign and its clinical applicability in Lewy body dementia and hypothesized that the sign would be likewise applicable in Lewy body dementia. MATERIALS AND METHODS: This was a retrospective cross-sectional multicenter study including 97 patients (mean age, 65 ± 10 years; 46% women), consisting of the following: controls (n = 21) and those with Lewy body dementia (n = 19), Alzheimer disease (n = 20), frontotemporal lobe dementia (n = 20), and mild cognitive impairment (n = 17)...
July 13, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28704802/trajectories-of-depressive-symptoms-and-their-relationship-to-the-progression-of-dementia
#14
Maria Lage Barca, Karin Persson, Rannveig Eldholm, Jūratė Šaltytė Benth, Hege Kersten, Anne-Brita Knapskog, Ingvild Saltvedt, Geir Selbaek, Knut Engedal
BACKGROUND: The relationship between progression of Alzheimer's disease and depression and its underlying mechanisms has scarcely been studied. METHODS: A sample of 282 outpatients with Alzheimer's disease (AD; 105 with amnestic AD and 177 with Alzheimer's dementia) from Norway were followed up for an average of two years. Assessment included Cornell Scale for Depression in Dementia and Clinical Dementia Rating Scale (CDR) at baseline and follow-up to examine the relationship between AD and depression...
November 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28701492/behavioral-variant-frontotemporal-dementia-distinct-phenotypes-with-unique-functional-profiles
#15
Claire M O'Connor, Ramon Landin-Romero, Lindy Clemson, Cassandra Kaizik, Naomi Daveson, John R Hodges, Sharpley Hsieh, Olivier Piguet, Eneida Mioshi
OBJECTIVE: To identify distinct behavioral phenotypes of behavioral-variant frontotemporal dementia (bvFTD) and to elucidate differences in functional, neuroimaging, and progression to residential care placement. METHODS: Eighty-eight patients with bvFTD were included in a cluster analysis applying levels of disinhibition and apathy (Cambridge Behavioural Inventory-Revised) to identify phenotypic subgroups. Between-group (Kruskal-Wallis, Mann-Whitney U) functional differences (Disability Assessment for Dementia) and time to residential care placement (survival analyses) were examined...
July 12, 2017: Neurology
https://www.readbyqxmd.com/read/28697570/adherence-to-clinical-practice-guidelines-during-dementia-work-up-in-a-real-world-setting-a-study-from-the-registry-of-dementias-of-girona
#16
Oriol Turró-Garriga, Laia Calvó-Perxas, Joan Vilalta-Franch, Marta Hernández-Ferrándiz, Margarita Flaqué, Marta Linares, Marta Cullell, Jordi Gich, Isabel Casas, Héctor Perkal, Josep Garre-Olmo
BACKGROUND: There are several position statements and clinical practice guidelines (CPG) for diagnosing dementia. OBJECTIVE: Our aims were to evaluate the adherence to CPG among specialists in the 7 memory clinics included in the Registry of Dementias of Girona (ReDeGi), and to compare the results between 2007-2011 and 2012-2015. We also determined the time and number of visits required to achieve a diagnosis, the supplementary tests ordered, and the drugs prescribed according to dementia subtypes...
July 4, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28697558/comparative-analysis-of-cortical-microinfarcts-and-microbleeds-using-3-0-tesla-postmortem-magnetic-resonance-images-and-histopathology
#17
Atsushi Niwa, Yuichiro Ii, Akihiro Shindo, Ko Matsuo, Hidehiro Ishikawa, Akira Taniguchi, Shinichi Takase, Masayuki Maeda, Hajime Sakuma, Hiroyasu Akatsu, Yoshio Hashizume, Hidekazu Tomimoto
Microvascular lesions including cortical microinfarctions (CMIs) and cerebral lobar microbleeds (CMBs) are usually caused by cerebral amyloid angiopathy (CAA) in the elderly and are correlated with cognitive decline. However, their radiological-histopathological coincidence has not been revealed systematically with widely used 3-Tesla (3T) magnetic resonance imaging (MRI). The purpose of the present study is to delineate the histopathological background corresponding to MR images of these lesions. We examined formalin-fixed 10-mm thick coronal brain blocks from 10 CAA patients (five were also diagnosed with Alzheimer's disease, three with dementia with Lewy bodies, and two with CAA only) with dementia and six non CAA patients with neurodegenerative disease...
July 5, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28693437/effects-of-computerized-cognitive-training-on-neuroimaging-outcomes-in-older-adults-a-systematic-review
#18
Lisanne F Ten Brinke, Jennifer C Davis, Cindy K Barha, Teresa Liu-Ambrose
BACKGROUND: Worldwide, the population is aging and the number of individuals diagnosed with dementia is rising rapidly. Currently, there are no effective pharmaceutical cures. Hence, identifying lifestyle approaches that may prevent, delay, or treat cognitive impairment and dementia in older adults is becoming increasingly important. Computerized Cognitive Training (CCT) is a promising strategy to combat cognitive decline. Yet, the underlying mechanisms of the effect of CCT on cognition remain poorly understood...
July 10, 2017: BMC Geriatrics
https://www.readbyqxmd.com/read/28688824/white-matter-lesions-are-associated-with-specific-depressive-symptom-trajectories-among-incident-depression-and-dementia-populations-three-city-dijon-mri-study
#19
Phillip J Tully, Stephanie Debette, Bernard Mazoyer, Christophe Tzourio
OBJECTIVE: Evidence is mixed as to whether periventricular or deep white matter hyperintensities (WMHs) increase the risk for depressive symptoms, partly because of heterogeneity in depression measurement, short follow-up, and confounding by prodromal dementia. The study objective was to evaluate WMH volume in relation to discrete depressive symptoms over 10 years, stratifying by incident depression and dementia. METHODS: In this prospective longitudinal cohort study of a representative population sample from Dijon, France, 1,440 participants aged 65-80 years (median age: 72 years; 59...
July 5, 2017: American Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/28681479/enhancement-of-automated-blood-flow-estimates-enable-from-arterial-spin-labeled-mri
#20
Zahra Shirzadi, Bojana Stefanovic, Michael A Chappell, Joel Ramirez, Graeme Schwindt, Mario Masellis, Sandra E Black, Bradley J MacIntosh
PURPOSE: To validate a multiparametric automated algorithm-ENhancement of Automated Blood fLow Estimates (ENABLE)-that identifies useful and poor arterial spin-labeled (ASL) difference images in multiple postlabeling delay (PLD) acquisitions and thereby improve clinical ASL. MATERIALS AND METHODS: ENABLE is a sort/check algorithm that uses a linear combination of ASL quality features. ENABLE uses simulations to determine quality weighting factors based on an unconstrained nonlinear optimization...
July 6, 2017: Journal of Magnetic Resonance Imaging: JMRI
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