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https://www.readbyqxmd.com/read/29350330/role-of-dual-energy-ct-in-the-diagnosis-and-follow-up-of-gout-systematic-analysis-of-the-literature
#1
André Ramon, Amélie Bohm-Sigrand, Pierre Pottecher, Pascal Richette, Jean-Francis Maillefert, Herve Devilliers, Paul Ornetti
The aim of this systematic review was to determine the potential role of dual-energy CT in the diagnosis and follow-up of gout with regard to the Outcome Measures in Rheumatology (OMERACT) filter. A systematic analysis of the literature was conducted using the MEDLINE and Cochrane databases and published abstracts of international congresses, according to the criteria of the OMERACT filter: feasibility, reproducibility, validity versus laboratory (serum urate, MSU synovial fluid aspirate) and other imaging modalities for gout, and its sensitivity to change in patients on urate lowering therapy (ULT)...
January 19, 2018: Clinical Rheumatology
https://www.readbyqxmd.com/read/29349796/quantification-of-acyclovir-in-dermal-interstitial-fluid-and-human-serum-by-ultra-high-performance-liquid-chromatography-high-resolution-tandem-mass-spectrometry-for-topical-bioequivalence-evaluation
#2
Denise Schimek, Reingard Raml, Kevin A Francesconi, Manfred Bodenlenz, Frank Sinner
Time-concentration curves for the topical anti-viral drug acyclovir can provide valuable information for drug development. Open flow microperfusion (OFM) is used for continuous sampling of dermal interstitial fluid but it requires validated methods for subsequent sample analysis. Therefore, we developed a sensitive, selective and high throughput ultra-high-performance liquid chromatography-high resolution tandem mass spectrometry (UHPLC-HR MS/MS) method to determine acyclovir in human dermal interstitial fluid and serum...
January 19, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29348677/the-proliferation-capacity-of-cultured-neural-stem-cells-promoted-by-csf-collected-from-sah-patients-correlates-to-clinical-outcome
#3
Yun-An Chen, Kuo-Chuan Wang, Der-Zen Liu, Tai-Horng Young, Li-Kai Tsai
Neurogenesis from endogenous neural stem cells (NSCs) might contribute to functional recovery after stroke based on animal studies; however, the relationship between neurogenesis and post-stroke outcome has rarely been demonstrated in humans. We prospectively collected cerebrospinal fluid (CSF) from 36 patients with subarachnoid hemorrhage (SAH). The CSF was added to the culture medium of the rat NSCs to test the effects on proliferation (proliferation index [PI], percentage of Ki-67 immunoreactive cells). We correlated the PI with functional outcome based on the modified Rankin Scale at 3 months post-SAH...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348282/acquired-pyloric-stenosis-resulting-in-hypokalaemic-hyperchloraemic-normal-anion-gap-metabolic-acidosis-persistent-vomiting-in-an-adult-cause-and-effect
#4
Philip Kaye
A 24-year-old woman presented with a history of persistent vomiting for at least 3 months. This resulted in severe dehydration with risk of acute kidney injury. In addition to volume depletion, loss of gastric fluid resulted in a specific metabolic derangement-hypokalaemic, hypochloraemic normal anion gap metabolic alkalosis with a reduced ionised calcium concentration and paradoxical aciduria. These metabolic changes were reflected in her ECG. Investigation demonstrated acquired gastric outflow tract obstruction secondary to a pyloric peptic ulcer...
January 17, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29347926/handheld-ultrasound-to-avert-maternal-and-neonatal-deaths-in-2-regions-of-the-philippines-an-ibuntis%C3%A2-intervention-study
#5
Godofreda V Dalmacion, Ramon T Reyles, Antonia E Habana, Lalaine Mae V Cruz, Maricelle C Chua, Analyn T Ngo, Milagros J Tia-Jocson, Emmanuel S Baja
BACKGROUND: The major causes of maternal and neonatal mortality in the Philippines are hemorrhages and obstructed labor due to placental implantation abnormalities (PIAs), twin pregnancies and fetal malpresentations. All of which are all easily detected by ultrasound. However, women in rural areas and low-income groups do not have access to ultrasound during their prenatal care. We aimed to provide additional evidence on the benefits of handheld ultrasound (HU) for screening pregnancy related abnormalities in order to avert maternal and neonatal deaths...
January 18, 2018: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/29347765/laser-excited-motion-of-liquid-crystals-confined-in-a-microsized-volume-with-a-free-surface
#6
A V Zakharov, P V Maslennikov
The thermally excited vortical flow in a microsized liquid crystal (LC) volume with a free LC-air interface has been investigated theoretically based on the nonlinear extension of the Ericksen-Leslie theory, with accounting the entropy balance equation. Analysis of the numerical results show that due to interaction between the gradients of the director field ∇n[over ̂] and temperature field ∇T, caused by the focused heating, the thermally excited vortical fluid flow is maintained in the vicinity of the heat source...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347493/kinetic-theory-of-shear-thickening-for-a-moderately-dense-gas-solid-suspension-from-discontinuous-thickening-to-continuous-thickening
#7
Hisao Hayakawa, Satoshi Takada, Vicente Garzó
The Enskog kinetic theory for moderately dense gas-solid suspensions under simple shear flow is considered as a model to analyze the rheological properties of the system. The influence of the environmental fluid on solid particles is modeled via a viscous drag force plus a stochastic Langevin-like term. The Enskog equation is solved by means of two independent but complementary routes: (i) Grad's moment method and (ii) event-driven Langevin simulation of hard spheres. Both approaches clearly show that the flow curve (stress-strain rate relation) depends significantly on the volume fraction of the solid particles...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347490/free-energy-barriers-for-crystal-nucleation-from-fluid-phases
#8
Peter Koß, Antonia Statt, Peter Virnau, Kurt Binder
Monte Carlo simulations of crystal nuclei coexisting with the fluid phase in thermal equilibrium in finite volumes are presented and analyzed, for fluid densities from dense melts to the vapor. Generalizing the lever rule for two-phase coexistence in the canonical ensemble to finite volume, "measurements" of the nucleus volume together with the pressure and chemical potential of the surrounding fluid allows us to extract the surface free energy of the nucleus. Neither the knowledge of the (in general nonspherical) nucleus shape nor of the angle-dependent interface tension is required for this task...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347489/entropy-of-level-cut-random-gaussian-structures-at-different-volume-fractions
#9
Stjepan Marčelja
Cutting random Gaussian fields at a given level can create a variety of morphologically different two- or several-phase structures that have often been used to describe physical systems. The entropy of such structures depends on the covariance function of the generating Gaussian random field, which in turn depends on its spectral density. But the entropy of level-cut structures also depends on the volume fractions of different phases, which is determined by the selection of the cutting level. This dependence has been neglected in earlier work...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347398/forced-underwater-laminar-flows-with-active-magnetohydrodynamic-metamaterials
#10
Dean Culver, Yaroslav Urzhumov
Theory and practical implementations for wake-free propulsion systems are proposed and proven with computational fluid dynamic modeling. Introduced earlier, the concept of active hydrodynamic metamaterials is advanced by introducing magnetohydrodynamic metamaterials, structures with custom-designed volumetric distribution of Lorentz forces acting on a conducting fluid. Distributions of volume forces leading to wake-free, laminar flows are designed using multivariate optimization. Theoretical indications are presented that such flows can be sustained at arbitrarily high Reynolds numbers...
December 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347115/multiple-relaxation-time-lattice-boltzmann-simulation-for-flow-mass-transfer-and-adsorption-in-porous-media
#11
Qiang Ma, Zhenqian Chen, Hao Liu
In this paper, to predict the dynamics behaviors of flow and mass transfer with adsorption phenomena in porous media at the representative elementary volume (REV) scale, a multiple-relaxation-time (MRT) lattice Boltzmann (LB) model for the convection-diffusion equation is developed to solve the transfer problem with an unsteady source term in porous media. Utilizing the Chapman-Enskog analysis, the modified MRT-LB model can recover the macroscopic governing equations at the REV scale. The coupled MRT-LB model for momentum and mass transfer is validated by comparing with the finite-difference method and the analytical solution...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347101/formation-of-liquid-drops-at-an-orifice-and-dynamics-of-pinch-off-in-liquid-jets
#12
Manash Pratim Borthakur, Gautam Biswas, Dipankar Bandyopadhyay
This paper presents a numerical investigation of the dynamics of pinch-off in liquid drops and jets during injection of a liquid through an orifice into another fluid. The current study is carried out by solving axisymmetric Navier-Stokes equations and the interface is captured using a coupled level-set and volume-of-fluid approach. The delicate interplay of inertia and viscous effects plays a crucial role in deciding the dynamics of the formation as well as breakup of liquid drops and jets. In the dripping regime, the growth and breakup rate of a drop are studied and quantified by corroborating with theoretical predictions...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347052/capacitively-coupled-rf-discharge-with-a-large-amount-of-microparticles-spatiotemporal-emission-pattern-and-microparticle-arrangement
#13
M Y Pustylnik, I L Semenov, E Zähringer, H M Thomas
The effect of micron-sized particles on a low-pressure capacitively coupled rf discharge is studied both experimentally and using numerical simulations. In the laboratory experiments, microparticle clouds occupying a considerable fraction of the discharge volume are supported against gravity with the help of the thermophoretic force. The spatiotemporally resolved optical emission measurements are performed with different arrangements of microparticles. The numerical simulations are carried out on the basis of a one-dimensional hybrid (fluid-kinetic) discharge model describing the interaction between plasma and microparticles in a self-consistent way...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346921/orthotropic-hydraulic-permeability-of-arrays-of-parallel-cylinders
#14
Mohsen Maleki, Robert J Martinuzzi, Walter Herzog, Salvatore Federico
Approximate analytical methods are presented to calculate the overall orthotropic hydraulic permeability of a flow with low Reynolds number, passing through a bundle of parallel circular cylinders. Two particular distributions are considered: (i) arrays with ordered rectangular lattices and (ii) irregular nonrandom distributions for which the unit cell cross sections are elliptical. The standard unit cell models, originally developed by Happel and Kuwabara for a random distribution of cylinders, are adapted to the case of nonrandom distributions...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346893/resuspension-threshold-of-a-granular-bed-by-localized-heating
#15
C Morize, E Herbert, A Sauret
The resuspension and dispersion of particles occur in industrial fluid dynamic processes as well as environmental and geophysical situations. In this paper, we experimentally investigate the ability to fluidize a granular bed with a vertical gradient of temperature. Using laboratory experiments with a localized heat source, we observe a large entrainment of particles into the fluid volume beyond a threshold temperature. The buoyancy-driven fluidized bed then leads to the transport of solid particles through the generation of particle-laden plumes...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346864/effects-of-particle-fluid-density-ratio-on-the-interactions-between-the-turbulent-channel-flow-and-finite-size-particles
#16
Zhaosheng Yu, Zhaowu Lin, Xueming Shao, Lian-Ping Wang
A parallel direct-forcing fictitious domain method is employed to perform fully resolved numerical simulations of turbulent channel flow laden with finite-size particles. The effects of the particle-fluid density ratio on the turbulence modulation in the channel flow are investigated at the friction Reynolds number of 180, the particle volume fraction of 0.84%, and the particle-fluid density ratio ranging from 1 to 104.2. The results show that the variation of the flow drag with the particle-fluid density ratio is not monotonic, with a larger flow drag for the density ratio of 10...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346831/postoperative-reduction-of-intraventricular-hemorrhage-volume-single-versus-dual-catheter-drainage
#17
Syed Shahzad Hussain, Asif Raza, Saman Shahid, Hafiz Hamza Asif, Usman Ahmad, Naveed Ashraf
BACKGROUND/AIMS:  The use of single/dual external ventricular drains (EVD) for reducing intraventricular hemorrhage (IVH) is under investigation. A randomized controlled trial was conducted to compare postoperative reduction of IVH volume using single- and dual-catheter drainage in spontaneous IVH patients. We investigated factors that may influence an effective hematoma volume reduction by EVDs. MATERIALS AND METHODS:  The average cerebrospinal fluid (CSF) drainage volumes were analyzed...
January 18, 2018: Journal of Neurological Surgery. Part A, Central European Neurosurgery
https://www.readbyqxmd.com/read/29346247/concurrent-versus-sequential-intrapleural-instillation-of-tissue-plasminogen-activator-and-deoxyribonuclease-for-pleural-infection
#18
Fayez Kheir, George Cheng, Estefania Rivera, Alejandro Folch, Erik Folch, Fernandez-Bussy Sebastian, Colleen Keyes, Mihir Parikh, Colleen Channick, Alex Chee, Adnan Majid
BACKGROUND: Treatment of pleural infection with instillation of sequential intrapleural tissue plasminogen activator (tPA) and human recombinant deoxyribonuclease (DNase) twice daily for a total of 6 doses has been shown to decrease surgical referral and improve radiographic imaging. This labor-intensive regimen was empirically chosen. Thus, it remains unclear whether the 2 drugs can be administered immediately one after the other (concurrent administration) instead of instilling them separately with a 1-hour to 2-hour interval in between (sequential administration)...
January 16, 2018: Journal of Bronchology & Interventional Pulmonology
https://www.readbyqxmd.com/read/29345510/preliminary-evaluation-of-the-viability-of-peritoneal-drainage-catheters-implanted-in-rats-for-extended-durations
#19
Nathan Legband, Arielle Black, Craig Kreikemeier-Bower, Benjamin S Terry
Purpose/Aim: In developing a novel peritoneal oxygenation therapy, catheters implanted into the peritoneal cavity became obstructed with omental tissue and prevented the infusion and removal of fluid from the peritoneal cavity. The obstruction of peritoneal catheters is a significant failure in researching various peritoneal treatments as further fluid administration is no longer possible. The purpose of this preliminary study was to determine the most effective catheter design for infusion and removal of fluid into the peritoneal cavity of rats...
January 18, 2018: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/29345431/the-effect-of-diuresis-on-extravascular-lung-water-and-pulmonary-function-in-acute-decompensated-heart-failure
#20
Steven C Chase, Caitlin C Fermoyle, Courtney M Wheatley, Jacob J Schaefer, Lyle J Olson, Bruce D Johnson
AIMS: The effect of extravascular lung water (EVLW) and relationship to functional status as a result of acute decompensated heart failure (ADHF) are not well understood. We sought to quantify changes in clinical variables, EVLW, airway anatomy, spirometry, and diffusing capacity for carbon monoxide before and after treatment for ADHF. METHODS AND RESULTS: Fifteen patients were recruited within 24 h of hospital admission. Spirometry, diffusing capacity for carbon monoxide, and surrogates of EVLW by computed tomography were measured and were then repeated within 24 h of discharge...
January 18, 2018: ESC Heart Failure
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