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https://www.readbyqxmd.com/read/28324943/overcoming-spatio-temporal-limitations-using-dynamically-scaled-in-vitro-pc-mri-a-flow-field-comparison-to-true-scale-computer-simulations-of-idealized-stented-and-patient-specific-left-main-bifurcations
#1
Susann Beier, John Ormiston, Mark Webster, John Cater, Stuart Norris, Pau Medrano-Gracia, Alistair Young, Kathleen Gilbert, Brett Cowan
The majority of patients with angina or heart failure have coronary artery disease. Left main bifurcations are particularly susceptible to pathological narrowing. Flow is a major factor of atheroma development, but limitations in imaging technology such as spatio-temporal resolution, signal-to-noise ratio (SNRv), and imaging artefacts prevent in vivo investigations. Computational fluid dynamics (CFD) modelling is a common numerical approach to study flow, but it requires a cautious and rigorous application for meaningful results...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28320289/cancer-bad-luck-or-punishment
#2
A V Lichtenstein
Contrasting opinions on the role of extrinsic and intrinsic factors in cancer etiology (Tomasetti, C., and Vogelstein, B. (2015) Science, 347, 78-81; Wu, S., et al. (2016) Nature, 529, 43-47) variously define priorities in the war on cancer. The correlation between the lifetime risk of several types of cancer and the total number of divisions of normal self-renewing cells revealed by the authors has given them grounds to put forward the "bad luck" hypothesis. It assumes that ~70% of cancer variability is attributed to random errors arising during DNA replication in normal, noncancerous stem cells, i...
January 2017: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/28318505/machine-learning-in-the-prediction-of-cardiac-epicardial-and-mediastinal-fat-volumes
#3
É O Rodrigues, V H A Pinheiro, P Liatsis, A Conci
We propose a methodology to predict the cardiac epicardial and mediastinal fat volumes in computed tomography images using regression algorithms. The obtained results indicate that it is feasible to predict these fats with a high degree of correlation, thus alleviating the requirement for manual or automatic segmentation of both fat volumes. Instead, segmenting just one of them suffices, while the volume of the other may be predicted fairly precisely. The correlation coefficient obtained by the Rotation Forest algorithm using MLP Regressor for predicting the mediastinal fat based on the epicardial fat was 0...
February 24, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28315992/omega-3-fatty-acid-supplementation-decreases-dna-damage-in-brain-of-rats-subjected-to-a-chemically-induced-chronic-model-of-tyrosinemia-type-ii
#4
Milena Carvalho-Silva, Lara M Gomes, Giselli Scaini, Joyce Rebelo, Adriani P Damiani, Maiara Pereira, Vanessa M Andrade, Fernanda F Gava, Samira S Valvassori, Patricia F Schuck, Gustavo C Ferreira, Emilio L Streck
Tyrosinemia type II is an inborn error of metabolism caused by a mutation in a gene encoding the enzyme tyrosine aminotransferase leading to an accumulation of tyrosine in the body, and is associated with neurologic and development difficulties in numerous patients. Because the accumulation of tyrosine promotes oxidative stress and DNA damage, the main aim of this study was to investigate the possible antioxidant and neuroprotective effects of omega-3 treatment in a chemically-induced model of Tyrosinemia type II in hippocampus, striatum and cerebral cortex of rats...
March 18, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28306610/30-day-potentially-avoidable-readmissions-due-to-adverse-drug-events
#5
Olivia Dalleur, Patrick E Beeler, Jeffrey L Schnipper, Jacques Donzé
OBJECTIVE: To analyze the patterns of potentially avoidable readmissions due to adverse drug events (ADEs) to identify the most appropriate risk reduction interventions. METHODS: In this observational study, we analyzed a random sample of 534 potentially avoidable 30-day readmissions from 10,275 consecutive discharges from the medical department of an academic hospital. Readmissions due to ADEs were reviewed to identify the causative drugs and the severity and interventions to prevent them...
March 17, 2017: Journal of Patient Safety
https://www.readbyqxmd.com/read/28304291/insulin-resistance-and-future-cognitive-performance-and-cognitive-decline-in%C3%A2-elderly-patients-with-cardiovascular-disease
#6
Miri Lutski, Galit Weinstein, Uri Goldbourt, David Tanne
BACKGROUND: The role of insulin resistance (IR) in the pathogenesis of cognitive performance is not yet clear. OBJECTIVE: To examine the associations between IR and cognitive performance and change in cognitive functions two decades later in individuals with cardiovascular disease with and without diabetes. METHODS: A subset of 489 surviving patients (mean age at baseline 58±6.6 y) with coronary heart disease who previously participated in the secondary prevention Bezafibrate Infarction Prevention (BIP trial; 1990-1997), were included in the current neurocognitive study...
March 10, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28303372/ellagic-acid-ameliorates-learning-and-memory-deficits-in-a-rat-model-of-alzheimer-s-disease-an-exploration-of-underlying-mechanisms
#7
Zahra Kiasalari, Rana Heydarifard, Mohsen Khalili, Siamak Afshin-Majd, Tourandokht Baluchnejadmojarad, Elham Zahedi, Ashkan Sanaierad, Mehrdad Roghani
RATIONALE: Alzheimer's disease (AD) is a neurodegenerative disorder with irreversible loss of intellectual abilities. Current therapies for AD are still insufficient. OBJECTIVE: In this study, the effect of ellagic acid on learning and memory deficits was evaluated in intrahippocampal amyloid beta (Aβ25-35)-microinjected rats and its modes of action were also explored. METHODS: AD rat model was induced by bilateral intrahippocampal microinjection of Aβ25-35 and ellagic acid was daily administered (10, 50, and 100 mg/kg), and learning, recognition memory, and spatial memory were evaluated in addition to histochemical assessment, oxidative stress, cholinesterases activity, and level of nuclear factor-kappaB (NF-κB), Toll-like receptor 4 (TLR4), and nuclear factor (erythroid-derived 2)-like 2 (Nrf2)...
March 16, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28301193/an-illustration-of-the-effects-of-fluctuations-in-test-information-on-measurement-error-the-attenuation-of-effect-sizes-and-diagnostic-reliability
#8
Brian P O'Connor
Measurement precision often fluctuates across latent trait continuums. Plots of test information are typically provided in item response theory (IRT) investigations, but the numerical values for test information are not readily interpretable. This article draws attention to the important, nonlinear relationships between test information, location-specific standard errors of measurement, and location-specific reliability. It provides a method for examining the attenuation in effect sizes (correlations) that is caused by fluctuating levels of measurement error...
March 16, 2017: Psychological Assessment
https://www.readbyqxmd.com/read/28298904/rna-primer-extension-hinders-dna-synthesis-by-escherichia-coli-mutagenic-dna-polymerase-iv
#9
Tommy F Tashjian, Ida Lin, Verena Belt, Tiziana M Cafarelli, Veronica G Godoy
In Escherichia coli the highly conserved DNA damage regulated dinB gene encodes DNA Polymerase IV (DinB), an error prone specialized DNA polymerase with a central role in stress-induced mutagenesis. Since DinB is the DNA polymerase with the highest intracellular concentrations upon induction of the SOS response, further regulation must exist to maintain genomic stability. Remarkably, we find that DinB DNA synthesis is inherently poor when using an RNA primer compared to a DNA primer, while high fidelity DNA polymerases are known to have no primer preference...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28296917/enzyme-replacement-therapy-for-anderson-fabry-disease-a-complementary-overview-of-a-cochrane-publication-through-a-linear-regression-and-a-pooled-analysis-of-proportions-from-cohort-studies
#10
Regina El Dib, Huda Gomaa, Alberto Ortiz, Juan Politei, Anil Kapoor, Fellype Barreto
BACKGROUND: Anderson-Fabry disease (AFD) is an X-linked recessive inborn error of glycosphingolipid metabolism caused by a deficiency of alpha-galactosidase A. Renal failure, heart and cerebrovascular involvement reduce survival. A Cochrane review provided little evidence on the use of enzyme replacement therapy (ERT). We now complement this review through a linear regression and a pooled analysis of proportions from cohort studies. OBJECTIVES: To evaluate the efficacy and safety of ERT for AFD...
2017: PloS One
https://www.readbyqxmd.com/read/28296801/accounting-for-nonsampling-error-in-estimates-of-hiv-epidemic-trends-from-antenatal-clinic-sentinel-surveillance
#11
Jeffrey W Eaton, Le Bao
OBJECTIVES: The aim of the study was to propose and demonstrate an approach to allow additional nonsampling uncertainty about HIV prevalence measured at antenatal clinic sentinel surveillance (ANC-SS) in model-based inferences about trends in HIV incidence and prevalence. DESIGN: Mathematical model fitted to surveillance data with Bayesian inference. METHODS: We introduce a variance inflation parameter (Equation is included in full-text article...
April 2017: AIDS
https://www.readbyqxmd.com/read/28295846/the-enigmatic-oncogene-and-tumor-suppressor-like-properties-of-rad54b-insights-into-genome-instability-and-cancer
#12
REVIEW
Erin N McAndrew, Kirk J McManus
One of the major challenges to the cell is to ensure genome stability, which can be compromised through endogenous errors or exogenous DNA damaging agents, such as ionizing radiation or common chemotherapeutic agents. To maintain genome stability the cell has a multifaceted line of defense, including cell cycle checkpoints and DNA damage repair pathways. RAD54B is involved in many of these pathways and thus exhibits a role in maintaining and repairing genome stability following DNA damage. RAD54B is involved in cell cycle regulation after DNA damage and participates in homologous recombinational repair, which ensures the precise repair of the most deleterious DNA lesions, double-stranded breaks...
March 13, 2017: Genes, Chromosomes & Cancer
https://www.readbyqxmd.com/read/28295339/annual-research-review-childhood-maltreatment-latent-vulnerability-and-the-shift-to-preventative-psychiatry-the-contribution-of-functional-brain-imaging
#13
REVIEW
Eamon J McCrory, Mattia I Gerin, Essi Viding
BACKGROUND: Childhood maltreatment is a potent predictor of poor mental health across the life span. We argue that there is a need to improve the understanding of the mechanisms that confer psychiatric vulnerability following maltreatment, if we are to progress from simply treating those with a manifest disorder, to developing effective preventative approaches that can help offset the likelihood that such disorders will emerge in the first place. METHODS: We review extant functional neuroimaging studies of children and adolescents exposed to early neglect and/or maltreatment, including physical, sexual and emotional abuse across four neurocognitive domains: threat processing, reward processing, emotion regulation and executive control...
March 13, 2017: Journal of Child Psychology and Psychiatry, and Allied Disciplines
https://www.readbyqxmd.com/read/28292771/margaret-mccartney-punishing-individuals-won-t-prevent-errors
#14
Margaret McCartney
No abstract text is available yet for this article.
March 14, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28290581/deconvolution-of-heterogeneous-wound-tissue-samples-into-relative-macrophage-phenotype-composition-via-models-based-on-gene-expression
#15
Nicole M Ferraro, Will Dampier, Michael S Weingarten, Kara L Spiller
Macrophages, the primary cell of the innate immune system, act on a spectrum of phenotypes that correspond to diverse functions. Dysregulation of macrophage phenotype is associated with many diseases. In particular, defective transition from pro-inflammatory (M1) to anti-inflammatory (M2) behavior has been implicated as a potential source of sustained inflammation that prevents healing of chronic wounds such as diabetic ulcers. In order to design effective treatments, an understanding of the relative presence of macrophage phenotypes during tissue repair is necessary...
March 14, 2017: Integrative Biology: Quantitative Biosciences From Nano to Macro
https://www.readbyqxmd.com/read/28288853/establishing-evidence-based-thresholds-and-laboratory-practices-to-reduce-inappropriate-treatment-of-pseudohyperkalemia
#16
Pratistha Ranjitkar, Dina N Greene, Geoffrey S Baird, Andrew N Hoofnagle, Patrick C Mathias
BACKGROUND: Unrecognized pseudohyperkalemia (PHK), defined as an artificial increase in measured potassium concentration, due to thrombocytosis and leukocytosis can lead to inappropriate patient treatment. Understanding the laboratory and patient characteristics that increase risk of PHK is key to preventing diagnostic errors. METHODS: Serum/plasma potassium results collected at 2 laboratories over 4years were selected based on blood cell counts collected within 24h and whole blood potassium concentrations determined within 2h of the serum/plasma sample...
March 10, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28286578/validity-of-the-microsoft-kinect-system-in-assessment-of-compensatory-stepping-behavior-during-standing-and-treadmill-walking
#17
Guy Shani, Amir Shapiro, Goldstein Oded, Kagan Dima, Itshak Melzer
BACKGROUND: Rapid compensatory stepping plays an important role in preventing falls when balance is lost; however, these responses cannot be accurately quantified in the clinic. The Microsoft Kinect™ system provides real-time anatomical landmark position data in three dimensions (3D), which may bridge this gap. METHODS: Compensatory stepping reactions were evoked in 8 young adults by a sudden platform horizontal motion on which the subject stood or walked on a treadmill...
2017: European Review of Aging and Physical Activity
https://www.readbyqxmd.com/read/28279915/low-rank-and-sparse-decomposition-based-shape-model-and-probabilistic-atlas-for-automatic-pathological-organ-segmentation
#18
Changfa Shi, Yuanzhi Cheng, Jinke Wang, Yadong Wang, Kensaku Mori, Shinichi Tamura
One major limiting factor that prevents the accurate delineation of human organs has been the presence of severe pathology and pathology affecting organ borders. Overcoming these limitations is exactly what we are concerned in this study. We propose an automatic method for accurate and robust pathological organ segmentation from CT images. The method is grounded in the active shape model (ASM) framework. It leverages techniques from low-rank and sparse decomposition (LRSD) theory to robustly recover a subspace from grossly corrupted data...
February 22, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28276939/controlling-anxiety-mediates-the-influence-of-childhood-adversities-on-risky-sexual-behaviors-among-emerging-adults
#19
Janet Yuen-Ha Wong, Edmond Pui-Hang Choi, Claudia Kor-Yee Chan, Daniel Yee-Tak Fong
Relatively little research has assessed the exposure-response relationship of childhood adversities on engaging in risky sexual behaviors. Also, no previous research has examined the interrelationship among childhood adversities, adult anxiety and depressive symptoms, and risky sexual behaviors. This study aimed to investigate their interrelationships. We used data from a multisite survey of emerging adults aged 18 to 29 studying at four universities in Hong Kong between September and December 2015. Structural equation modeling (SEM) was used to examine the pathways from childhood adversities to risky sexual behaviors...
February 14, 2017: Journal of Sex Research
https://www.readbyqxmd.com/read/28273373/acute-care-management-of-the-hiv-infected-patient-a-report-from-the-hiv-practice-and-research-network-of-the-american-college-of-clinical-pharmacy
#20
Spencer H Durham, Melissa E Badowski, Michelle D Liedtke, R Chris Rathbun, Patricia Pecora Fulco
OBJECTIVE: HIV-infected patients admitted to the hospital have complex antiretroviral therapy (ART) regimens with an increased medication error rate upon admission. This report is intended to provide a resource for clinicians managing HIV-infected patients and ART in the inpatient setting. METHODS: A survey of the authors was conducted to evaluate common issues that arise during an acute hospitalization for HIV-infected patients. After a group consensus, a review of the medical literature was performed to determine the supporting evidence for the following HIV associated hospital queries: admission/discharge orders, antiretroviral hospital formularies, laboratory monitoring, altered hepatic/renal function, drug-drug interactions (DDIs), enteral administration, and therapeutic drug monitoring...
March 8, 2017: Pharmacotherapy
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