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https://www.readbyqxmd.com/read/29778608/technical-success-and-long-term-results-with-excluder-c3-endoprosthesis-in-narrow-aortic-biforcations-first-italian-multicentre-experience
#1
Gian Franco Veraldi, Luca Mezzetto, Filippo Vaccher, Lorenzo Scorsone, Stefano Bonvini, Igor Raunig, Valentina Wassermann, Sebastiano Tasselli
PURPOSE: This study aims at evaluating technical success and long-term results using Gore Excluder/C3 endoprosthesis in patients with narrow aortic bifurcation (NAB, inner-inner aortic diameter <18mm). METHODS: Clinical and anatomical data were collected retrospectively from patients treated in two high-volume Italian vascular centres between 2005 and 2017. A total of 1325 EVAR procedures were performed: 195 involved Excluder/C3 Gore endoprosthesis. 141 patients had a regular aortic bifurcation (RAB, maximum inner-inner diameter ≥ 18mm), while 54 presented NAB (< 18mm)...
May 17, 2018: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29777394/biomechanical-impact-of-wrong-positioning-of-a-dedicated-stent-for-coronary-bifurcations-a-virtual-bench-testing-study
#2
Claudio Chiastra, Maik J Grundeken, Carlos Collet, Wei Wu, Joanna J Wykrzykowska, Giancarlo Pennati, Gabriele Dubini, Francesco Migliavacca
The treatment of coronary bifurcations is challenging for interventional cardiologists. The Tryton stent (Tryton Medical, Inc., USA) is one of the few devices specifically designed for coronary bifurcations that underwent large clinical trials. Although the manufacturer provides specific recommendations to position the stent in the bifurcation side branch (SB) according to four radio-opaque markers under angiographic guidance, wrong device positioning may accidentally occur. In this study, the virtual bench testing approach was used to investigate the impact of wrong positioning of the Tryton stent in coronary bifurcations in terms of geometrical and biomechanical criteria...
May 17, 2018: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/29776934/coiling-of-ruptured-wide-necked-basilar-tip-aneurysm-using-double-comaneci-technique
#3
Stanimir S Sirakov, Alexander Sirakov, Hristo Hristov, Radoslav Raychev
In this report, we present a novel technique of successful coil embolisation using temporary deployment of two Comaneci devices placed in Y configuration across a wide-neck ruptured basilar tip aneurysm. The placement of two devices across the wide aneurysm neck allowed optimal coverage for safe coil delivery, while maintaining parent vessel patency. This case highlights the unique and safe applicability of two crossed Comaneci devices in a ruptured aneurysm with unfavourable anatomy, ultimately resulting in complete aneurysm obliteration...
May 18, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29776163/constructing-hopf-bifurcation-lines-for-the-stability-of-nonlinear-systems-with-two-time-delays
#4
Romain Modeste Nguimdo
Although the plethora real-life systems modeled by nonlinear systems with two independent time delays, the algebraic expressions for determining the stability of their fixed points remain the Achilles' heel. Typically, the approach for studying the stability of delay systems consists in finding the bifurcation lines separating the stable and unstable parameter regions. This work deals with the parametric construction of algebraic expressions and their use for the determination of the stability boundaries of fixed points in nonlinear systems with two independent time delays...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29776151/extreme-events-and-single-pulse-spatial-patterns-observed-in-a-self-pulsing-all-solid-state-laser
#5
Carlos Bonazzola, Alejandro Hnilo, Marcelo Kovalsky, Jorge Tredicce
The passively Q-switched, self-pulsing all-solid-state laser is a device of widespread use in many applications. Depending on the condition of saturation of the absorber, which is easy to adjust, different dynamical regimes are observed: continuous-wave emission, stable oscillations, period doubling bifurcations, chaos, and, within some chaotic regimes, extreme events (EEs) in the form of pulses of extraordinary intensity. These pulses are sometimes called "dissipative optical rogue waves." The mechanism of their formation in this laser is unknown...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29776090/asymmetric-simple-exclusion-process-with-position-dependent-hopping-rates-phase-diagram-from-boundary-layer-analysis
#6
Sutapa Mukherji
In this paper, we study a one-dimensional totally asymmetric simple exclusion process with position-dependent hopping rates. Under open boundary conditions, this system exhibits boundary-induced phase transitions in the steady state. Similarly to totally asymmetric simple exclusion processes with uniform hopping, the phase diagram consists of low-density, high-density, and maximal-current phases. In various phases, the shape of the average particle density profile across the lattice including its boundary-layer parts changes significantly...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29772936/the-effect-of-supine-positioning-on-maternal-hemodynamics-during-late-pregnancy
#7
Aimee Humphries, S Ali Mirjalili, Gregory P Tarr, John M D Thompson, Peter Stone
INTRODUCTION: Recent studies have demonstrated an association between maternal supine sleep position and an increased risk of late stillbirth. During late pregnancy the gravid uterus compresses the inferior vena cava when a woman lies in the supine position. The azygos system of veins is the dominant pathway of collateral venous return back to the heart in the event of acute obstruction of the inferior vena cava. It is suggested that this pathway provides adequate collateral venous circulation in the event of inferior vena caval compression in the supine position during late pregnancy...
May 17, 2018: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29772314/urgent-use-of-gore-excluder-iliac-branch-endoprosthesis-ibe-with-left-transaxillary-approach-for-preservation-of-the-residual-hypogastric-artery-a-case-series
#8
D'Oria Mario, Chiarandini Stefano, Pipitone Marco, Calvagna Cristiano, Riccitelli Francesco, Rotelli Alice, Zamolo Francesca, Griselli Filippo
Preservation of the residual hypogastric artery (HGA) in patients with previous endovascular aortic aneurysm repair (EVAR) may require complex operative strategies. We report an alternative technique to preserve the residual HGA with the Gore Excluder Iliac Branch endoprosthesis (IBE) in urgent situations. MethodsWe report the case of two high-risk patients (unfit for open surgery), with previous EVAR and exclusion of one HGA, treated in emergency setting. Both patients met the anatomical requirements for Gore IBE use...
May 14, 2018: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29771185/can-the-relationship-between-rapid-automatized-naming-and-word-reading-be-explained-by-a-catastrophe-empirical-evidence-from-students-with-and-without-reading-difficulties
#9
Georgios D Sideridis, Panagiotis Simos, Angeliki Mouzaki, Dimitrios Stamovlasis, George K Georgiou
The purpose of the present study was to explain the moderating role of rapid automatized naming (RAN) in word reading with a cusp catastrophe model. We hypothesized that increases in RAN performance speed beyond a critical point would be associated with the disruption in word reading, consistent with a "generic shutdown" hypothesis. Participants were 587 elementary schoolchildren (Grades 2-4), among whom 87 had reading comprehension difficulties per the IQ-achievement discrepancy criterion. Data were analyzed via a cusp catastrophe model derived from the nonlinear dynamics systems theory...
May 1, 2018: Journal of Learning Disabilities
https://www.readbyqxmd.com/read/29769758/mean-field-limits-for-interacting-diffusions-in-a-two-scale-potential
#10
S N Gomes, G A Pavliotis
In this paper, we study the combined mean field and homogenization limits for a system of weakly interacting diffusions moving in a two-scale, locally periodic confining potential, of the form considered in Duncan et al. (Brownian motion in an N-scale periodic potential, arXiv:1605.05854, 2016b). We show that, although the mean field and homogenization limits commute for finite times, they do not, in general, commute in the long time limit. In particular, the bifurcation diagrams for the stationary states can be different depending on the order with which we take the two limits...
2018: Journal of Nonlinear Science
https://www.readbyqxmd.com/read/29766011/use-of-iliac-branch-device-for-endovascular-treatment-for-abdominal-aorta-aneurysm-with-small-diameter-neck
#11
Umberto G Rossi, Davide Santuari, Raffaello Dallatana, Maurizio Cariati
We present the case of a 78-year-old woman with a 4.5-cm symptomatic abdominal aortic aneurysm with a small diameter (13-mm diameter) infrarenal aortic neck who underwent endovascular treatment using an iliac branch device as a bifurcated aortic stent-graft.
December 2017: Aorta (Stamford, Conn.)
https://www.readbyqxmd.com/read/29765755/crystal-structure-of-bis-diiso-propyl-ammonium-cis-di-iodido-bis-oxolato-%C3%AE%C2%BA-2-o-1-o-2-stannate-iv
#12
Bougar Sarr, Cheikh Abdoul Khadir Diop, Mamadou Sidibé, Yoann Rousselin
In the title compound, (i Pr2 NH2 )2 [SnI2 (C2 O4 )2 ], which was prepared by reacting ( i Pr2 NH2 + )2 ·C2 O4 2- with SnI4 in a 2:1 molar ratio in a mixed ethanol-aceto-nitrile solvent, the Sn atom is coordinated by two chelating oxalate ions and two iodide ions, with the latter in a cis configuration. In the crystal, the cations are linked to the anions by N-H⋯O and bifurcated N-H⋯(O,O) hydrogen bonds, generating [10-1] chains.
April 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/29765715/crystal-structure-and-hirshfeld-surface-analysis-of-e-4-2-4-hy-droxy-benzo-yl-hydrazin-1-yl-idene-meth-yl-pyridin-1-ium-nitrate
#13
Mir Abolfazl Naziri, Ertan Şahin, Tuncer Hökelek
The asymmetric unit of the title aroyl hydrazone Schiff base salt, C13 H12 N3 O2 + ·N O3 - , consists of one mol-ecular cation in the keto tautomeric form, adopting an E configuration with respect to the azomethine bond, and one nitrate anion. The two units are linked via an N-H⋯O hydrogen bond. The mol-ecule overall is non-planar, with the pyridinium and benzene rings being inclined to each other by 4.21 (4)°. In the crystal, cations and anions are linked via inter-molecular O-H⋯O and bifurcated N-H⋯O hydrogen bonds, forming a two-dimensional network parallel to (101)...
March 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/29765697/analytical-model-of-the-feto-placental-vascular-system-consideration-of-placental-oxygen-transport
#14
Parisa Mirbod
The placenta is a transient vascular organ that enables nutrients and blood gases to be exchanged between fetal and maternal circulations. Herein, the structure and oxygen diffusion across the trophoblast membrane between the fetal and maternal red blood cells in the feto-placental vasculature system in both human and mouse placentas are presented together as a functional unit. Previous models have claimed that the most efficient fetal blood flow relies upon structures containing a number of 'conductive' symmetrical branches, offering a path of minimal resistance that maximizes blood flow to the terminal villi, where oxygen diffusion occurs...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29765397/lvis-jr-device-for-y-stent-assisted-coil-embolization-of-wide-neck-intracranial-aneurysms-a-multicenter-experience
#15
Edgar A Samaniego, Aldo A Mendez, Thanh N Nguyen, Vladimir Kalousek, Waldo R Guerrero, Sudeepta Dandapat, Guilherme Dabus, Italo Linfante, Ameer E Hassan, Alexander Drofa, Evgueni Kouznetsov, David Leedahl, David Hasan, Alberto Maud, Santiago Ortega-Gutierrez
Background and Purpose: Complex wide-neck intracranial aneurysms are challenging to treat. We report a multicenter experience using the LVIS Jr stent for "Y-stent"-assisted coiling embolization of wide-neck bifurcation aneurysms. Methods: Seven centers provided retrospective data on patients who underwent Y-stenting. Technical complications, immediate posttreatment angiographic results, clinical outcomes, and imaging follow-up were assessed. Results: Thirty patients/aneurysms were treated: 15 basilar tip, 8 middle cerebral artery, 4 anterior communicating artery, 1 pericallosal, and 2 posterior inferior cerebellar artery aneurysms...
April 2018: Interventional Neurology
https://www.readbyqxmd.com/read/29765392/carotid-stenting-for-treatment-of-symptomatic-carotid-webs-a-single-center-case-series
#16
Waleed Brinjikji, Ronit Agid, Vitor M Pereira
Background and Purpose: Carotid webs are an increasingly recognized cause of acute is-chemic stroke, particularly in younger adults. The optimal medical and surgical strategies for managing these lesions have not been well established. We report a single-center case series of carotid stenting for treatment of symptomatic carotid webs. Materials and Methods: Consecutive patients undergoing stent placement for treatment of symptomatic carotid webs were included. Carotid webs were defined as a thin intraluminal filling defect along the posterior wall of the carotid bulb just beyond the carotid bifurcation on CTA...
April 2018: Interventional Neurology
https://www.readbyqxmd.com/read/29765314/underlying-mechanisms-of-cooperativity-input-specificity-and-associativity-of-long-term-potentiation-through-a-positive-feedback-of-local-protein-synthesis
#17
Lijie Hao, Zhuoqin Yang, Jinzhi Lei
Long-term potentiation (LTP) is a specific form of activity-dependent synaptic plasticity that is a leading mechanism of learning and memory in mammals. The properties of cooperativity, input specificity, and associativity are essential for LTP; however, the underlying mechanisms are unclear. Here, based on experimentally observed phenomena, we introduce a computational model of synaptic plasticity in a pyramidal cell to explore the mechanisms responsible for the cooperativity, input specificity, and associativity of LTP...
2018: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/29764544/-effects-of-peroxisome-proliferator-activated-receptor-%C3%AE-toll-like-receptor-4-tumor-necrosis-factor-%C3%AE-targeted-pathway-on-hyperglycemia-induced-myocardium-inflammation-and-oxidative-stress
#18
Changle Liu, Ruimeng Liu, Xiaohan Wu, Peize Tan, Huaying Fu, Xinghua Wang, Tong Liu, Guangping Li
OBJECTIVE: To investigate the potential effects and mechanism on peroxisome proliferator-activated receptor γ-toll-like receptor 4-tumor necrosis factor-α (PPARγ-TLR4-TNF-α) targeted pathway on hyperglycemia induced myocardium inflammation and oxidative stress. METHODS: Thirty-two Japanese healthy adult rabbits were randomly divided into four groups with 8 rabbits in each group: normal control group (NC group), diabetes mellitus group (DM group), diabetes mellitus + pioglitazone 4 mg×kg-1 ×d-1 and 8 mg×kg-1 ×d-1 groups (DM+PGZ 4 mg and 8 mg groups)...
May 2018: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29763742/period-adding-bifurcation-and-chaos-in-a-hybrid-hindmarsh-rose-model
#19
Yi Yang, Xiaofeng Liao, Tao Dong
Recently, the hybrid neuron models which combine the basic neuron models with impulsive effect(the state reset process) had been proposed, however, the preset value and the reset value of membrane potential were both fixed constants in the known models. In this paper, the Hindmarsh-Rose neuron model with nonlinear reset process is presented where the preset value and the reset value of membrane potential are variable constants. We conduct a qualitative analysis in the vicinity of the equilibrium point or the limit cycle of the proposed system by using the theories of impulsive semi-dynamical systems...
April 27, 2018: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/29762775/combination-superficial-temporal-artery-middle-cerebral-artery-bypass-and-m2-m2-reanastomosis-with-trapping-of-a-stented-distal-middle-cerebral-artery-aneurysm-3-dimensional-operative-video
#20
Jan-Karl Burkhardt, Sonia Yousef, Halima Tabani, Arnau Benet, Roberto Rodriguez Rubio, Michael T Lawton
Distal middle cerebral artery (MCA) aneurysms often have non-saccular morphology and cannot be clipped, requiring revascularization and trapping instead. Combination bypasses are needed when 2 arteries exit the aneurysm, and extracranial-intracranial and intracranial-intracranial bypasses can be used. This video demonstrates a combination bypass used to treat a previously stented distal MCA aneurysm with both a superficial temporal artery (STA)-to-MCA bypass and an M2-to-M2 reanastomosis. This 56-yr-old man presented with distal left-sided MCA aneurysm 2 years earlier and attempted stent-assisted coiling was aborted after the aneurysm was perforated with stenting alone...
May 12, 2018: Operative Neurosurgery (Hagerstown, Md.)
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