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https://www.readbyqxmd.com/read/28324968/improving-cardiopulmonary-resuscitation-cpr-outcomes-using-model-based-optimization
#1
Dieter Bender, Ali Jalali, C Nataraj
Cardiopulmonary Resuscitation (CPR) outcomes are far from optimal as practiced today, and prior work has documented that among probable reasons is the fact that the procedure remains to be fully understood. In an attempt to gain a broader understanding of the CPR physiology and the elemental principles underlying the CPR outcomes, this study proposes a novel approach. The analysis is carried out in three major steps. First, an appropriate cardiovascular system model was adopted and simulated using real CPR data as the input...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324909/an-extrapericardial-minimally-invasive-approach-for-implantable-cardioverter-defibrillator
#2
Jeko M Madjarov, Michael G Katz, Brad Poole, Svetozar Madzharov, John M Fedor, Francis Robicsek
The indications for placement of an implantable cardioverter defibrillators (ICDs) have greatly expanded over the last years. However, standard transvenous approach is not suitable for a subset of patients who cannot benefit from ICD therapy. Here, we have demonstrated the feasibility and efficacy of extrapericardial ICD placement through a minimally invasive access in intact hearts as well as in postmyocardial infarction large animal models. Based on our data, we conclude that extrapericardial ICD placement is a feasible approach that may be a valuable alternative or adjunct to current defibrillator lead systems...
March 21, 2017: Thoracic and Cardiovascular Surgeon
https://www.readbyqxmd.com/read/28324174/combining-climatic-and-soil-properties-better-predicts-covers-of-brazilian-biomes
#3
Daniel M Arruda, Elpídio I Fernandes-Filho, Ricardo R C Solar, Carlos E G R Schaefer
Several techniques have been used to model the area covered by biomes or species. However, most models allow little freedom of choice of response variables and are conditioned to the use of climate predictors. This major restriction of the models has generated distributions of low accuracy or inconsistent with the actual cover. Our objective was to characterize the environmental space of the most representative biomes of Brazil and predict their cover, using climate and soil-related predictors. As sample units, we used 500 cells of 100 km(2) for ten biomes, derived from the official vegetation map of Brazil (IBGE 2004)...
April 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28319801/first-trimester-prediction-of-gestational-diabetes-mellitus-a-clinical-model-based-on-maternal-demographic-parameters
#4
Arianne N Sweeting, Heidi Appelblom, Glynis P Ross, Jencia Wong, Heikki Kouru, Paul F Williams, Mikko Sairanen, Jon A Hyett
AIM: Develop a first trimester risk prediction model for GDM based on maternal clinical characteristics in a large metropolitan multi-ethnic population and compare its performance to that of other recently published GDM prediction models and clinical risk scoring systems. METHODS: A retrospective case control study of 248 women who developed GDM and 732 controls who did not. Maternal clinical parameters were prospectively obtained at 11-13(+6) weeks' gestation. A predictive multivariate regression model for GDM was developed, evaluated using areas under the receiver-operating characteristic (AUC) curve...
March 7, 2017: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/28319760/improved-prediction-of-higher-heating-value-of-biomass-using-an-artificial-neural-network-model-based-on-proximate-analysis
#5
Harun Uzun, Zeynep Yıldız, Jillian L Goldfarb, Selim Ceylan
As biomass becomes more integrated into our energy feedstocks, the ability to predict its combustion enthalpies from routine data such as carbon, ash, and moisture content enables rapid decisions about utilization. The present work constructs a novel artificial neural network model with a 3-3-1 tangent sigmoid architecture to predict biomasses' higher heating values from only their proximate analyses, requiring minimal specificity as compared to models based on elemental composition. The model presented has a considerably higher correlation coefficient (0...
March 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28319746/predicting-biphasic-responses-in-binary-mixtures-pelargonic-acid-versus-glyphosate
#6
Regina G Belz, Hans-Peter Piepho
Predicting hormesis in mixtures is challenging, but essential considering that chemical exposures often occur in mixtures and at low doses. This study investigated mixture effects with two herbicides prone to induce hormesis and to interact, namely pelargonic acid versus glyphosate. Five independent mixture experiments were conducted in vitro to assess effects on root growth of lettuce. Mixture effects on the dose were analyzed using classical joint-action models in terms of deviation from the reference model of concentration addition...
March 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28319389/potential-antiosteoporotic-natural-product-lead-compounds-that-inhibit-17%C3%AE-hydroxysteroid-dehydrogenase-type-2
#7
Anna Vuorinen, Roger T Engeli, Susanne Leugger, Fabio Bachmann, Muhammad Akram, Atanas G Atanasov, Birgit Waltenberger, Veronika Temml, Hermann Stuppner, Liselotte Krenn, Sylvin B Ateba, Dieudonné Njamen, Rohan A Davis, Alex Odermatt, Daniela Schuster
17β-Hydroxysteroid dehydrogenase type 2 (17β-HSD2) converts the active steroid hormones estradiol, testosterone, and 5α-dihydrotestosterone into their weakly active forms estrone, Δ(4)-androstene-3,17-dione, and 5α-androstane-3,17-dione, respectively, thereby regulating cell- and tissue-specific steroid action. As reduced levels of active steroids are associated with compromised bone health and onset of osteoporosis, 17β-HSD2 is considered a target for antiosteoporotic treatment. In this study, a pharmacophore model based on 17β-HSD2 inhibitors was applied to a virtual screening of various databases containing natural products in order to discover new lead structures from nature...
March 20, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28319087/erratum-model-based-projections-of-zika-virus-infections-in-childbearing-women-in-the-americas
#8
T Alex Perkins, Amir S Siraj, Corrine W Ruktanonchai, Moritz U G Kraemer, Andrew J Tatem
No abstract text is available yet for this article.
March 20, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28318936/vector-model-supported-approach-in-prostate-plan-optimization
#9
Eva Sau Fan Liu, Vincent Wing Cheung Wu, Benjamin Harris, Margot Lehman, David Pryor, Lawrence Wing Chi Chan
Lengthy time consumed in traditional manual plan optimization can limit the use of step-and-shoot intensity-modulated radiotherapy/volumetric-modulated radiotherapy (S&S IMRT/VMAT). A vector model base, retrieving similar radiotherapy cases, was developed with respect to the structural and physiologic features extracted from the Digital Imaging and Communications in Medicine (DICOM) files. Planning parameters were retrieved from the selected similar reference case and applied to the test case to bypass the gradual adjustment of planning parameters...
March 17, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28318825/riparian-erosion-vulnerability-model-based-on-environmental-features
#10
Alejandra Botero-Acosta, Maria L Chu, Jorge A Guzman, Patrick J Starks, Daniel N Moriasi
Riparian erosion is one of the major causes of sediment and contaminant load to streams, degradation of riparian wildlife habitats, and land loss hazards. Land and soil management practices are implemented as conservation and restoration measures to mitigate the environmental problems brought about by riparian erosion. This, however, requires the identification of vulnerable areas to soil erosion. Because of the complex interactions between the different mechanisms that govern soil erosion and the inherent uncertainties involved in quantifying these processes, assessing erosion vulnerability at the watershed scale is challenging...
March 16, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28318696/coupling-lidar-and-thermal-imagery-to-model-the-effects-of-riparian-vegetation-shade-and-groundwater-inputs-on-summer-river-temperature
#11
Vincent Wawrzyniak, Pascal Allemand, Sarah Bailly, Jérôme Lejot, Hervé Piégay
In the context of global warming, it is important to understand the drivers controlling river temperature in order to mitigate temperature increases. A modeling approach can be useful for quantifying the respective importance of the different drivers, notably groundwater inputs and riparian shading which are potentially critical for reducing summer temperature. In this study, we use a one-dimensional deterministic model to predict summer water temperature at an hourly time step over a 21km reach of the lower Ain River (France)...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28317393/structural-analysis-of-two-different-stent-configurations
#12
M Simão, J M Ferreira, J Mora-Rodriguez, H M Ramos
Two different stent configurations (i.e. the well known Palmaz-Schatz (PS) and a new stent configuration) are mechanically investigated. A finite element model was used to study the two geometries under combining loads and a computational fluid dynamic model based on fluid structure interaction was developed investigating the plaque and the artery wall reactions in a stented arterial segment. These models determine the stress and displacement fields of the two stents under internal pressure conditions. Results suggested that stent designs cause alterations in vascular anatomy that adversely affect arterial stress distributions within the wall, which have impact in the vessel responses such as the restenosis...
March 20, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28317325/experimental-verification-of-advanced-collapsed-cone-engine-for-use-with-a-multichannel-vaginal-cylinder-applicator
#13
Brie Cawston-Grant, Hali Morrison, Geetha Menon, Ron S Sloboda
Model-based dose calculation algorithms have recently been incorporated into brachytherapy treatment planning systems, and their introduction requires critical evaluation before clinical implementation. Here, we present an experimental evaluation of Oncentra(®) Brachy Advanced Collapsed-cone Engine (ACE) for a multichannel vaginal cylinder (MCVC) applicator using radiochromic film. A uniform dose of 500 cGy was specified to the surface of the MCVC using the TG-43 dose formalism under two conditions: (a) with only the central channel loaded or (b) only the peripheral channels loaded...
March 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28316067/fisse-a-simple-non-parametric-test-for-the-effects-of-a-binary-character-on-lineage-diversification-rates
#14
Daniel L Rabosky, Emma E Goldberg
It is widely assumed that phenotypic traits can influence rates of speciation and extinction, and several statistical approaches have been used to test for correlations between character states and lineage diversification. Recent work suggests that model-based tests of state-dependent speciation and extinction are sensitive to model inadequacy and phylogenetic pseudoreplication. We describe a simple non-parametric statistical test ("FiSSE") to assess the effects of a binary character on lineage diversification rates...
March 18, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28316035/management-of-percutaneous-coronary-intervention-complications
#15
REVIEW
Gregory Means, Christopher End, Prashant Kaul
With the recent increase in complex coronary interventions including percutaneous coronary intervention (PCI) for chronic total occlusions and complex higher risk (and indicated) patients, the spectrum of potential periprocedural complications and their prompt management has become even more relevant. Vascular access-related problems remain the most prevalent of all PCI complications and with randomized controlled trial data from over 20,000 patients supporting the superiority of radial over femoral access in reducing bleeding and vascular complications, a default radial strategy should be promoted...
April 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28315990/model-based-registration-of-preprocedure-mr-and-intraprocedure-us-of-the-lumbar-spine
#16
Delaram Behnami, Alireza Sedghi, Emran Mohammad Abu Anas, Abtin Rasoulian, Alexander Seitel, Victoria Lessoway, Tamas Ungi, David Yen, Jill Osborn, Parvin Mousavi, Robert Rohling, Purang Abolmaesumi
PURPOSE: Epidural and spinal needle insertions, as well as facet joint denervation and injections are widely performed procedures on the lumbar spine for delivering anesthesia and analgesia. Ultrasound (US)-based approaches have gained popularity for accurate needle placement, as they use a non-ionizing, inexpensive and accessible modality for guiding these procedures. However, due to the inherent difficulties in interpreting spinal US, they yet to become the clinical standard-of-care...
March 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28315935/double-balloon-catheter-for-induction-of-labour-in-women-with-a-previous-cesarean-section-could-it-be-the-best-choice
#17
Carlos De Bonrostro Torralba, Eva Lucía Tejero Cabrejas, Sabina Marti Gamboa, María Lapresta Moros, Jose Manuel Campillos Maza, Sergio Castán Mateo
INTRODUCTION: We analysed the efficacy and safety of double-balloon catheter for cervical ripening in women with a previous cesarean section and which were the most important variables associated with an increased risk of repeated cesarean delivery. MATERIALS AND METHODS: We designed an observational retrospective study of 418 women with unfavourable cervices (Bishop Score <5), a prior cesarean delivery, and induction of labour with a double-balloon catheter...
March 18, 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28315689/in-silico-prediction-of-hpxr-activators-using-structure-based-pharmacophore-modeling
#18
Nao Torimoto-Katori, Ruili Huang, Harutoshi Kato, Rikiya Ohashi, Menghang Xia
The activation of pregnane X receptor (PXR), a member of the nuclear receptor superfamily, can mediate potential drug-drug interactions by regulating the expression of several drug- mediated enzymes and transporters, resulting in reduced therapeutic efficacy or increased toxicity by producing reactive metabolites. Therefore, in the early stage of drug development, it is important to predict these risks using an in silico approach. We constructed a human PXR (hPXR) pharmacophore model based on known structural information of compounds that activate PXR...
March 15, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28315385/a-study-on-the-in-vitro-percutaneous-absorption-of-silver-nanoparticles-in-combination-with-aluminum-chloride-methyl-paraben-or-di-n-butyl-phthalate
#19
Katarzyna Domeradzka-Gajda, Marek Nocuń, Joanna Roszak, Beata Janasik, C Derrick Quarles, Wojciech Wąsowicz, Jarosław Grobelny, Emilia Tomaszewska, Grzegorz Celichowski, Katarzyna Ranoszek-Soliwoda, Małgorzata Cieślak, Dorota Puchowicz, Jhanis J Gonzalez, Richard E Russo, Maciej Stępnik
Some reports indicate that the silver released from dermally applied products containing silver nanoparticles (AgNP) (e.g. wound dressings or cosmetics) can penetrate the skin, particularly if damaged. AgNP were also shown to have cytotoxic and genotoxic activity. In the present study percutaneous absorption of AgNP of two different nominal sizes (Ag15nm or Ag45nm by STEM) and surface modification, i.e. citrate or PEG stabilized nanoparticles, in combination with cosmetic ingredients, i.e. aluminum chloride (AlCl3), methyl paraben (MPB), or di-n-butyl phthalate (DBPH) was assessed using in vitro model based on dermatomed pig skin...
March 14, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28314756/predicting-occupational-asthma-and-rhinitis-in-bakery-workers-referred-for-clinical-evaluation
#20
Badri Sadat Jonaid, Jos Rooyackers, Erik Stigter, Lützen Portengen, Esmeralda Krop, Dick Heederik
BACKGROUND: Occupational allergic diseases are a major problem in some workplaces like in the baking industry. Diagnostic rules have been used in surveillance but not yet in the occupational respiratory clinic. OBJECTIVE: To develop diagnostic models predicting baker's asthma and rhinitis among bakery workers at high risk of sensitisation to bakery allergens referred to a specialised clinic. METHODS: As part of a medical surveillance programme, clinical evaluation was performed on 436 referred Dutch bakery workers at high risk for sensitisation to bakery allergens...
March 17, 2017: Occupational and Environmental Medicine
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