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https://www.readbyqxmd.com/read/29786776/a-framework-for-image-based-modeling-of-acute-myocardial-ischemia-using-intramurally-recorded-extracellular-potentials
#1
Brett M Burton, Kedar K Aras, Wilson W Good, Jess D Tate, Brian Zenger, Rob S MacLeod
The biophysical basis for electrocardiographic evaluation of myocardial ischemia stems from the notion that ischemic tissues develop, with relative uniformity, along the endocardial aspects of the heart. These injured regions of subendocardial tissue give rise to intramural currents that lead to ST segment deflections within electrocardiogram (ECG) recordings. The concept of subendocardial ischemic regions is often used in clinical practice, providing a simple and intuitive description of ischemic injury; however, such a model grossly oversimplifies the presentation of ischemic disease-inadvertently leading to errors in ECG-based diagnoses...
May 21, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29786459/anatomy-of-the-attraction-basins-breaking-with-the-intuition
#2
Leticia Hernando, Alexander Mendiburu, Jose A Lozano
Solving combinatorial optimization problems efficiently requires the development of algorithms that consider the specific properties of the problems. In this sense, local search algorithms are designed over a neighborhood structure that partially accounts for these properties. Considering a neighborhood, the space is usually interpreted as a natural landscape, with valleys and mountains. Under this perception, it is commonly believed that, if maximizing, the solutions located in the slopes of the same mountain belong to the same attraction basin, with the peaks of the mountains being the local optima...
May 22, 2018: Evolutionary Computation
https://www.readbyqxmd.com/read/29785732/the-mental-representation-of-human-action
#3
Sydney Levine, Alan M Leslie, John Mikhail
Various theories of moral cognition posit that moral intuitions can be understood as the output of a computational process performed over structured mental representations of human action. We propose that action plan diagrams-"act trees"-can be a useful tool for theorists to succinctly and clearly present their hypotheses about the information contained in these representations. We then develop a methodology for using a series of linguistic probes to test the theories embodied in the act trees. In Study 1, we validate the method by testing a specific hypothesis (diagrammed by act trees) about how subjects are representing two classic moral dilemmas and finding that the data support the hypothesis...
May 21, 2018: Cognitive Science
https://www.readbyqxmd.com/read/29785727/body-composition-profiling-in-the-uk-biobank-imaging-study
#4
Jennifer Linge, Magnus Borga, Janne West, Theresa Tuthill, Melissa R Miller, Alexandra Dumitriu, E Louise Thomas, Thobias Romu, Patrik Tunón, Jimmy D Bell, Olof Dahlqvist Leinhard
OBJECTIVE: This study aimed to investigate the value of imaging-based multivariable body composition profiling by describing its association with coronary heart disease (CHD), type 2 diabetes (T2D), and metabolic health on individual and population levels. METHODS: The first 6,021 participants scanned by UK Biobank were included. Body composition profiles (BCPs) were calculated, including abdominal subcutaneous adipose tissue, visceral adipose tissue (VAT), thigh muscle volume, liver fat, and muscle fat infiltration (MFI), determined using magnetic resonance imaging...
May 22, 2018: Obesity
https://www.readbyqxmd.com/read/29782650/predicting-obstructive-coronary-artery-disease-using-carotid-ultrasound-parameters-a-nomogram-from-a-large-real-world-clinical-data
#5
Na Wu, Xinghua Chen, Mingyang Li, Xiaolong Qu, Yueli Li, Weijia Xie, Long Wu, Ying Xiang, Yafei Li, Li Zhong
BACKGROUND: Carotid ultrasound is a non-invasive tool for risk assessment of coronary artery disease (CAD). There is no consensus on which carotid ultrasound parameter constitutes the best measurement of atherosclerosis. We investigated which model of carotid ultrasound parameters and clinical risk factors (CRF) have the highest predictive value for CAD. MATERIALS AND METHODS: We enrolled 2431 consecutive patients who have suspected CAD and underwent coronary angiography and carotid ultrasound with measurements of carotid intima-media thickness (CIMT), total number of plaques and areas of different types of plaques classified by echogenicity...
May 21, 2018: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29782079/the-dipep-diagnosis-of-pe-in-pregnancy-study-an-observational-study-of-the-diagnostic-accuracy-of-clinical-assessment-d-dimer-and-chest-x-ray-for-suspected-pulmonary-embolism-in-pregnancy-and-postpartum
#6
Steve Goodacre, Kimberley Horspool, Catherine Nelson-Piercy, Marian Knight, Neil Shephard, Fiona Lecky, Steven Thomas, Beverley J Hunt, Gordon Fuller
OBJECTIVE: To identify clinical features associated with PE diagnosis and determine the accuracy of decision rules and D-dimer for diagnosing suspected PE in pregnant/postpartum women. DESIGN: Observational cohort study augmented with additional cases. SETTING: Emergency departments and maternity units at eleven prospectively recruiting sites and maternity units in the United Kingdom Obstetric Surveillance System (UKOSS). POPULATION: 324 pregnant/postpartum women with suspected PE and 198 pregnant/postpartum women with diagnosed PE...
May 21, 2018: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/29781626/on-selecting-evidence-to-test-hypotheses-a-theory-of-selection-tasks
#7
Marco Ragni, Ilir Kola, Philip N Johnson-Laird
How individuals choose evidence to test hypotheses is a long-standing puzzle. According to an algorithmic theory that we present, it is based on dual processes: individuals' intuitions depending on mental models of the hypothesis yield selections of evidence matching instances of the hypothesis, but their deliberations yield selections of potential counterexamples to the hypothesis. The results of 228 experiments using Wason's selection task corroborated the theory's predictions. Participants made dependent choices of items of evidence: the selections in 99 experiments were significantly more redundant (using Shannon's measure) than those of 10,000 simulations of each experiment based on independent selections...
May 21, 2018: Psychological Bulletin
https://www.readbyqxmd.com/read/29781450/music-brain-plasticity-and-the-resilience-the-pillars-of-new-receptive-therapy
#8
Helena Dukić
This paper describes a new type of receptive music therapy which aims to build the patients' psychological resilience by increasing the levels of dopamine, serotonin and oxytocin in order to increase standard psychopharmacological treatment efficiency. Previous research concerning the musically induced production of the two neurotransmitters and a hormone is discussed and reviewed. Based upon the existent studies concerning the influence of music on dopamine, serotonin and oxytocin induction, a new design of specific music features for this purpose is proposed and elaborated upon...
April 2018: Psychiatria Danubina
https://www.readbyqxmd.com/read/29781101/feline-ureteral-obstructions-part-2-surgical-management
#9
REVIEW
D L Clarke
Feline obstructive ureteral disease will likely remain a common and frustrating cause of critical illness in cats for the foreseeable future. Since many cats are uraemic and cardiovascularly unstable secondary to obstructive nephropathy, prompt recognition using clinical intuition, blood work and diagnostic imaging is essential to make a timely diagnosis and decision about timing for intervention, if indicated. Multiple surgical and interventional procedures exist for the management of feline ureteral obstructions but there is no ideal technique and all currently available procedures carry risk of infection, re-obstruction, urine leakage and the need for additional procedures in the future...
May 20, 2018: Journal of Small Animal Practice
https://www.readbyqxmd.com/read/29780170/model-selection-theory-the-need-for-a-more-nuanced-picture-of-use-novelty-and-double-counting
#10
Katie Steele, Charlotte Werndl
This article argues that common intuitions regarding (a) the specialness of 'use-novel' data for confirmation and (b) that this specialness implies the 'no-double-counting rule', which says that data used in 'constructing' (calibrating) a model cannot also play a role in confirming the model's predictions, are too crude. The intuitions in question are pertinent in all the sciences, but we appeal to a climate science case study to illustrate what is at stake. Our strategy is to analyse the intuitive claims in light of prominent accounts of confirmation of model predictions...
June 2018: British Journal for the Philosophy of Science
https://www.readbyqxmd.com/read/29779797/the-function-of-the-heart-is-historically-contingent
#11
Nicholas Binney
Some philosophers of medicine argue that there are objective facts about the biological function of organs, and that these facts are used to objectively define diseases. The function of the heart is taken to be particularly obvious and well established. Contrary to this, I argue that the function of the heart is not fixed by nature, but rather that it is historically contingent. The disease heart failure results from the dysfunction of the heart. In opposition to the common-sense intuitions of philosophers, medics do not define heart failure simply as a reduced cardiac output, and up to half of patients with heart failure have a normal cardiac output...
May 17, 2018: Studies in History and Philosophy of Biological and Biomedical Sciences
https://www.readbyqxmd.com/read/29778105/trailing-haptic-first-modification-of-double-needle-intrascleral-haptic-fixation-technique
#12
Dooho Brian Kim
The Yamane double-needle intrascleral haptic fixation technique for posterior chamber intraocular lens (IOL) fixation in the setting of absent or inadequate capsule support is a minimally invasive IOL fixation technique that requires scleral incisions using needles to externalize the IOL haptics. Despite being a seemingly easy and intuitive procedure, there are significant challenges when learning this technique. The most difficult step is threading the trailing haptic with the needle for fixation. If using an IOL with weak haptics, this step can result in haptic kink or breakage, which renders the haptics useless for this technique and necessitating explantation of the IOL...
April 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29777356/visuospatial-abilities-and-fine-motor-experiences-influence-acquisition-and-maintenance-of-fundamentals-of-laparoscopic-surgery-fls-task-performance
#13
Cuan M Harrington, Patrick Dicker, Oscar Traynor, Dara O Kavanagh
BACKGROUND: Minimally invasive surgery poses a unique learning curve due to the requirement for non-intuitive psychomotor skills. The fundamentals of laparoscopic surgery (FLS) program trains and certifies residents in such skills. However, innate predictors of FLS performance and maintenance remain to be described. This single-centre observational study aimed to assess for candidate factors influencing the acquisition and maintenance of FLS performance amongst a surgically naïve cohort...
May 18, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29777120/softness-induced-enhancement-in-net-throughput-of-non-linear-bio-fluids-in-nanofluidic-channel-under-edl-phenomenon
#14
Harshad Sanjay Gaikwad, Pranab Kumar Mondal, Somchai Wongwises
In this article, we describe the electro-hydrodynamics of non-Newtonian fluid in narrow fluidic channel with solvent permeable and ion-penetrable polyelectrolyte layer (PEL) grafted on channel surface with an interaction of non-overlapping electric double layer (EDL) phenomenon. In this analysis, we integrate power-law model in the momentum equation for describing the non-Newtonian rheology. The complex interplay between the non-Newtonian rheology and interfacial electrochemistry in presence of PEL on the walls leads to non-intuitive variations in the underlying flow dynamics in the channels...
May 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29776159/fluctuating-nonlinear-hydrodynamics-of-flocking
#15
Sunil Kumar Yadav, Shankar P Das
Starting from a microscopic model, the continuum field theoretic description of the dynamics of a system of active ingredients or "particles" is presented. The equations of motion for the respective collective densities of mass and momentum follow exactly from that of a single element in the flock. The single-particle dynamics has noise and anomalous momentum dependence in its frictional terms. The equations for the collective densities are averaged over a local equilibrium distribution to obtain the corresponding coarse grained equations of fluctuating nonlinear hydrodynamics (FNH)...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29774800/selfish-altruism-fierce-cooperation-and-the-predator
#16
Nikolaos Askitas
This paper suggests a new way to think about a famous question: what explains cooperation in nature and in particular in humans? I argue that, for an evolutionary biologist as well as a quantitative social scientist, the triangle of two 'teammates' in the presence of a predator (passing and shooting in two-on-one situations) is one of the fundamental conceptual building-blocks for understanding these phenomena because in such a situation the fact that life is packaged in many distinct enclosures (and not in one big monolithic blob) can unfold its comparative advantage...
December 2018: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/29774265/assisted-reproduction-and-middle-east-kinship-a-regional-and-religious-comparison
#17
Marcia C Inhorn, Daphna Birenbaum-Carmeli, Soraya Tremayne, Zeynep B Gürtin
This article compares the use of assisted reproductive technology (ART) and resultant kinship formations in four Middle Eastern settings: the Sunni Muslim Arab world, the Sunni Muslim but officially 'secular' country of Turkey, Shia Muslim Iran and Jewish Israel. This four-way comparison reveals considerable similarities, as well as stark differences, in matters of Middle Eastern kinship and assisted reproduction. The permissions and restrictions on ART, often determined by religious decrees, may lead to counter-intuitive outcomes, many of which defy prevailing stereotypes about which parts of the Middle East are more 'progressive' or 'conservative'...
June 2017: Reproductive Biomedicine & Society Online
https://www.readbyqxmd.com/read/29774168/evaluating-the-potential-for-maximized-t-cell-redistribution-entropy-to-improve-abscopal-responses-to-radiotherapy
#18
Rachel Walker, Jonathan D Schoenfeld, Shari Pilon-Thomas, Jan Poleszczuk, Heiko Enderling
The potential for local radiation therapy to elicit systemic (abscopal) anti-tumor immune responses has been receiving a significant amount of attention over the last decade. We recently developed a mathematical framework designed to simulate the systemic dissemination of activated T cells among multiple metastatic sites. This framework allowed the identification of non-intuitive patterns of T cell redistribution after localized therapy, and offered suggestions as to the optimal site to irradiate in order to increase the magnitude of an immune-mediated abscopal response...
September 2017: Convergent Science Physical Oncology
https://www.readbyqxmd.com/read/29773999/fitts-law-in-the-control-of-isometric-grip-force-with-naturalistic-targets
#19
Zachary C Thumser, Andrew B Slifkin, Dylan T Beckler, Paul D Marasco
Fitts' law models the relationship between amplitude, precision, and speed of rapid movements. It is widely used to quantify performance in pointing tasks, study human-computer interaction, and generally to understand perceptual-motor information processes, including research to model performance in isometric force production tasks. Applying Fitts' law to an isometric grip force task would allow for quantifying grasp performance in rehabilitative medicine and may aid research on prosthetic control and design...
2018: Frontiers in Psychology
https://www.readbyqxmd.com/read/29773560/establishment-of-locally-adapted-mutations-under-divergent-selection
#20
Matteo Tomasini, Stephan Peischl
We study the establishment probabilities of locally adapted mutations using a multi-type branching process framework. We find a surprisingly simple and intuitive analytical approximation for the establishment probabilities in a symmetric two-deme model under the assumption of weak (positive) selection. This is the first analytical closed-form approximation for arbitrary migration rate to appear in the literature. We find that the establishment probability lies between the weak and the strong migration limits if we condition the origin of the mutation to the deme where it is advantageous...
May 17, 2018: Genetics
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