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https://www.readbyqxmd.com/read/29679185/comparing-learning-curves-of-two-established-single-shot-devices-for-ablation-of-atrial-fibrillation
#1
Patrick Leitz, G Mönnig, F Güner, D G Dechering, K Wasmer, F Reinke, Philipp S Lange, L Eckardt, G Frommeyer
PURPOSE: We compared the contour of learning curves of two "single-shot" devices used for pulmonary vein isolation (PVI) for safety and procedural data. METHODS: We performed a retrospective analysis comparing the first 60 PVI performed at our center using a pulmonary vein ablation catheter (PVAC) array (39 male, mean age 57 years, 42 paroxysmal AF) to the first 60 first PVI using the Cryoballoon (44 male, mean age 59 years, 22 paroxysmal AF). Both groups were further divided into tertiles, where T1 regroups the first 20 ablations, T2 the following 20, and T3 the last 20 ablations...
April 20, 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29677829/highly-proton-conductive-poly-vinyl-acetate-nafion%C3%A2-composite-membrane-for-proton-exchange-membrane-fuel-cell-application
#2
M D Lutful Kabir, Hee Jin Kim, Chul Jae Lee, Sang-June Choi
A novel blend of membranes made of cast Nafion® and poly(vinyl acetate) (PVAc) was prepared and its proton conductivity and ion exchange capacity (IEC) were characterized to investigate its applicability in proton exchange membrane fuel cells (PEMFCs). The intermolecular interactions and morphology of these membranes were assessed using Fourier-transform infrared spectroscopy (FT-IR) and field-emission scanning electron microscopy (FE-SEM). A twofold increase in the proton conductivity is observed for the PVAc/Nafion® composite membrane (2 × 10-2 Scm-1) compared to that of cast Nafion® (1...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677821/tailor-made-electrospun-multilayer-composite-polymer-electrolytes-for-high-performance-lithium-polymer-batteries
#3
Du-Hyun Lim, Anupriya K Haridas, Stelbin Peter Figerez, Prasanth Raghavan, Aleksandar Matic, Jou-Hyeon Ahn
A novel tailor-made multilayer composite polymer electrolyte, consisting of two outer layers of electrospun polyacrylonitrile (PAN) and one inner layer of poly(vinyl acetate) (PVAc)/poly(methyl methacrylate) (PMMA)/poly(ethylene oxide) (PEO) fibrous membrane, was prepared using continuous electrospinning. These membranes, which are made up of fibers with diameters in the nanometer range, were stacked in layers to produce interconnected pores that result in a high porosity. Gel polymer electrolytes (GPEs) were prepared by entrapping a liquid electrolyte (1 M LiPF6 in ethylene carbonate/dimethyl carbonate) in the membranes...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29675528/well-dispersed-cellulose-nanocrystals-in-hydrophobic-polymers-by-in-situ-polymerization-for-synthesizing-highly-reinforced-bio-nanocomposites
#4
Shiyu Geng, Jiayuan Wei, Yvonne Aitomäki, Maxime Noël, Kristiina Oksman
In nanocomposites, dispersing hydrophilic nanomaterials in a hydrophobic matrix using simple and environmentally friendly methods remains challenging. Herein, we report a method based on in situ polymerization to synthesize nanocomposites of well-dispersed cellulose nanocrystals (CNCs) and poly(vinyl acetate) (PVAc). We have also shown that by blending this PVAc/CNC nanocomposite with poly(lactic acid) (PLA), a good dispersion of the CNCs can be reached in PLA. The outstanding dispersion of CNCs in both PVAc and PLA/PVAc matrices was shown by different microscopy techniques and was further supported by the mechanical and rheological properties of the composites...
April 20, 2018: Nanoscale
https://www.readbyqxmd.com/read/29543454/carotenoid-stability-during-dry-milling-storage-and-extrusion-processing-of-biofortified-maize-genotypes
#5
Darwin Ortiz, Amudhan Ponrajan, Juan Pablo Bonnet, Torbert Rocheford, Mario G Ferruzzi
Translation of the breeding efforts designed to biofortify maize ( Z. mays) genotypes with higher levels of provitamin A carotenoid (pVAC) content for sub-Saharan Africa is dependent in part on the stability of carotenoids during postharvest through industrial and in-home food processing operations. The purpose of this study was to simulate production of commercial milled products by determining the impact of dry milling and extrusion processing on carotenoid stability in three higher pVAC maize genotypes (C17xDE3, Orange ISO, Hi27xCML328)...
May 9, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29432401/long-term-outcomes-and-predictors-of-recurrence-after-pulmonary-vein-isolation-with-multielectrode-ablation-catheter-in-patients-with-atrial-fibrillation
#6
Sabine Fredersdorf, Carolin Fenzl, Carsten Jungbauer, Stefan Weber, Christian von Bary, Alexander Dietl, Joachim Seegers, Lars S Maier, Ekrem Ücer
PURPOSE: Despite various techniques used in atrial fibrillation ablation, recurrence of atrial arrhythmias still constitutes a clinical problem. The aim of this study was to document the long-term outcomes of pulmonary vein isolation with a ring-shaped ablation catheter (PVAC). METHODS: All consecutive patients presenting with paroxysmal or persistent atrial fibrillation (pxAF or perAF, respectively) treated with PVAC (first generation) were enrolled. After standard follow-up during the first year, all patients were contacted for long-term follow-up...
April 2018: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/29429715/ultrasonic-microwave-assisted-synthesis-of-three-dimensional-polyvinyl-alcohol-carbonate-graphene-oxide-sponge-and-studies-of-surface-resistivity-and-thermal-stability
#7
Yunna Song, Yuehai Li, Jihui Li, Yongshen Li, Shuai Niu, Ning Li
In the article, graphene oxide (GO) was prepared by flake graphite, nitric acid and peroxyacetic acid via the sonochemical method and characterized, and polyvinyl alcohol carbonate/GO composite (PVAC/GO composite) was synthesized by polyvinyl alcohol (PVA), dimethyl carbonate (DMC) and GO via the approach of transesterification in the case of ultrasonic-microwave synergistic effects and characterized, and three-dimensional PVAC/GO sponge (3D PVAC/GO sponge) was manufactured by PVAC/GO composite via the foaming approach and characterized, and the thermal stability and surface resistivity of 3D PVAC/GO sponge were investigated...
April 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29329495/organometallic-mediated-radical-polymerization-of-vinylidene-fluoride
#8
Sanjib Banerjee, Vincent Ladmiral, Antoine Debuigne, Christophe Detrembleur, Rinaldo Poli, Bruno Améduri
An unprecedented level of control for the radical polymerization of vinylidene fluoride (VDF), yielding well-defined PVDF (at least up to 14 500 g mol-1 ) with low dispersity (≤1.32), was achieved using organometallic-mediated radical polymerization (OMRP) with an organocobalt compound as initiator. The high chain-end fidelity was demonstrated by the synthesis of PVDF- and PVAc-containing di-and triblock copolymers. DFT calculations rationalize the efficient reactivation of both head and tail chain end dormant species...
March 5, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29316725/improvement-in-wood-bonding-strength-of-poly-vinyl-acetate-butyl-acrylate-emulsion-by-controlling-the-amount-of-redox-initiator
#9
Yun Zhang, Bo Pang, Sen Yang, Wei Fang, Sheng Yang, Tong-Qi Yuan, Run-Cang Sun
Polyvinyl acetate emulsion adhesive has been widely used due to its good bonding performance and environmentally friendly properties. Indeed, the bonding performance can be further improved by copolymerizing with other monomers. In this study, the effect of the adjunction of redox initiator (hydrogen peroxide-tartaric acid, H₂O₂-TA) on the properties of the poly (vinyl acetate-butyl acrylate) (P (VAc-BA)) emulsion adhesive was investigated. With increasing dosage, the reaction became more complete and the obtained film was more compact, as identified via SEM...
January 8, 2018: Materials
https://www.readbyqxmd.com/read/29285254/microrna-co-expression-networks-exhibit-increased-complexity-in-pancreatic-ductal-compared-to-vater-s-papilla-adenocarcinoma
#10
Tommaso Mazza, Massimiliano Copetti, Daniele Capocefalo, Caterina Fusilli, Tommaso Biagini, Massimo Carella, Antonio De Bonis, Nicola Mastrodonato, Ada Piepoli, Valerio Pazienza, Evaristo Maiello, Fabio Francesco di Mola, Pierluigi di Sebastiano, Angelo Andriulli, Francesca Tavano
MiRNA expression abnormalities in adenocarcinoma arising from pancreatic ductal system (PDAC) and Vater's papilla (PVAC) could be associated with distinctive pathologic features and clinical cancer behaviours. Our previous miRNA expression profiling data on PDAC (n=9) and PVAC (n=4) were revaluated to define differences/similarities in miRNA expression patterns. Afterwards, in order to uncover target genes and core signalling pathways regulated by specific miRNAs in these two tumour entities, miRNA interaction networks were wired for each tumour entity, and experimentally validated target genes underwent pathways enrichment analysis...
December 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/29250292/comparison-of-the-efficacy-of-pvac-%C3%A2-and-nmarq-%C3%A2-for-paroxysmal-atrial-fibrillation
#11
REVIEW
Avishag Laish-Farkash, Mahmoud Suleiman
Pulmonary vein isolation (PVI) has become the mainstay of therapy for atrial fibrillation (AF) and one of the most frequently performed procedures in the cardiac electrophysiology laboratory. PVI by a single-tip radiofrequency (RF) ablation catheter remains a complex and time-consuming procedure, especially in centers with limited experience. In order to simplify the PVI procedure, to shorten it and reduce the complication rate, circular multi-electrode catheters were introduced for simultaneous mapping and ablation...
April 2017: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/29092038/results-of-the-first-investigator-initiated-randomized-clinical-trial-of-nmarqtm-pvactm-and-thoracoscopic-ablation-for-paroxysmal-atrial-fibrillation
#12
Conn Sugihara, Steve Furniss, Jonathan Hyde, Michael Lewis, Neil Sulke
Aims: To investigate the effect of minimally invasive thoracoscopic surgical ablation and nMARQ irrigated multi-electrode phased radiofrequency (RF) ablation to treat paroxysmal atrial fibrillation (AF) compared with PVAC multi-electrode phased RF ablation, with beat-to-beat device-derived Holter monitoring throughout the study duration. Methods and results: An investigator-initiated prospective trial of patients with paroxysmal AF randomized (1:1:1) to initial surgical, nMARQ or PVAC ablation...
October 30, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29016870/complications-of-pulmonary-vein-isolation-in-atrial-fibrillation-predictors-and-comparison-between-four-different-ablation-techniques-results-from-the-middelheim-pvi-registry
#13
Yves De Greef, Edwin Ströker, Bruno Schwagten, Kaspars Kupics, Jeroen De Cocker, Gian-Battista Chierchia, Carlo de Asmundis, Dirk Stockman, Ian Buysschaert
Aims: To define predictors of complications of pulmonary vein isolation (PVI) and compare safety between different ablation techniques. Methods and results: One thousand patients with atrial fibrillation (AF) (age 60 ± 10, 72% males, CHA2DS2-VASc score 1 ± 1) underwent PVI using various techniques: conventional PVI (CPVI) using mapping with irrigated point-per-point RF ablation (n = 576), multi-electrode RF ablation with the pulmonary vein ablation catheter (PVAC) (n = 272) or high density mesh ablator (HDMA) (n = 59) and cryoballoon (CB) ablation (n = 93)...
August 3, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28964230/a-novel-interferometric-method-for-the-study-of-the-viscoelastic-properties-of-ultra-thin-polymer-films-determined-from-nanobubble-inflation
#14
P Chapuis, P C Montgomery, F Anstotz, A Leong-Hoï, C Gauthier, J Baschnagel, G Reiter, G B McKenna, A Rubin
Glass formation and glassy behavior remain as the important areas of investigation in soft matter physics with many aspects which are still not completely understood, especially at the nanometer size-scale. In the present work, we show an extension of the "nanobubble inflation" method developed by O'Connell and McKenna [Rev. Sci. Instrum. 78, 013901 (2007)] which uses an interferometric method to measure the topography of a large array of 5 μm sized nanometer thick films subjected to constant inflation pressures during which the bubbles grow or creep with time...
September 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28875448/clinical-outcomes-of-af-patients-treated-with-the-first-and-second-generation-of-circular-mapping-and-ablation-catheter-insights-from-a-real-world-multicenter-experience
#15
Giovanni Rovaris, Paolo De Filippo, Francesco Laurenzi, Gabriele Zanotto, Nicola Bottoni, Mattia Pozzi, Fabrizio Giofrè, Piergiuseppe De Girolamo, Emanuela Visentin, Elena Piazzi, Paola Ferrari
PURPOSE: Complete pulmonary vein isolation (PVI) is the best documented target for catheter ablation, and different technologies have shown comparable outcomes. The multielectrode phased-RF/duty cycled (PhRF/DC) pulmonary vein ablation catheter (PVAC) and its second generation (PVAC-GOLD) have shown promising clinical results in single and multicenter experiences. Our aim is to assess and compare the safety and efficacy in the real clinical practice among two generations of circular PhRF/DC catheters by performing PVI in patients suffering from recurrent atrial fibrillation (AF)...
December 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28867448/moisture-induced-phase-separation-and-recrystallization-in-amorphous-solid-dispersions
#16
Christian Luebbert, Gabriele Sadowski
Active Pharmaceutical Ingredients (APIs) are often dissolved in polymeric matrices to control the gastrointestinal dissolution and to stabilize the amorphous state of the API. During the pharmaceutical development of new formulations, stability studies via storage at certain temperature and relative humidity (RH) have to be carried out to verify the long-term thermodynamic stability of these formulations against unwanted recrystallization and moisture-induced amorphous-amorphous phase separation (MIAPS). This study focuses on predicting the MIAPS of API/polymer formulations at elevated RH...
October 30, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28852703/biomimetic-reversible-heat-stiffening-polymer-nanocomposites
#17
Elvis Cudjoe, Shaghayegh Khani, Amanda E Way, Michael J A Hore, Joao Maia, Stuart J Rowan
Inspired by the ability of the sea cucumber to (reversibly) increase the stiffness of its dermis upon exposure to a stimulus, we herein report a stimuli-responsive nanocomposite that can reversibly increase its stiffness upon exposure to warm water. Nanocomposites composed of cellulose nanocrystals (CNCs) that are grafted with a lower critical solution temperature (LCST) polymer embedded within a poly(vinyl acetate) (PVAc) matrix show a dramatic increase in modulus, for example, from 1 to 350 MPa upon exposure to warm water, the hypothesis being that grafting the polymers from the CNCs disrupts the interactions between the nanofibers and minimizes the mechanical reinforcement of the film...
August 23, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28640585/thermally-and-electrically-triggered-triple-shape-memory-behavior-of-poly-vinyl-acetate-poly-lactic-acid-due-to-graphene-induced-phase-separation
#18
Mohammad Sabzi, Masoud Babaahmadi, Mohammadreza Rahnama
This work aimed to develop a facile and broadly applicable method for fabricating multistimuli responsive triple-shape memory polymers (SMPs). Hence, herein the SMPs were prepared through the simple physical blending of two commercially available biopolymers, poly(lactic acid) (PLA) and poly(vinyl acetate) (PVAc), in the presence of robust and conductive graphene nanoplatelets. Interestingly, atomic force microscopy observations and thermal analyses revealed that the presence of nanofillers led to phase separation and appearance of two well-separated transition temperatures in the blend of these two miscible polymers...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28635284/competing-stereocomplexation-and-homocrystallization-of-poly-l-lactic-acid-poly-d-lactic-acid-racemic-mixture-effects-of-miscible-blending-with-other-polymers
#19
Jianna Bao, Xiaojia Xue, Kai Li, Xiaohua Chang, Qing Xie, Chengtao Yu, Pengju Pan
Promoting the stereocomplexation ability of high-molecular-weight poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) is an efficient way to improve the thermal resistance of the resulting materials. Herein, we studied the competing crystallization kinetics, polymorphic crystalline structure, and lamellae structure of the PLLA/PDLA component in its miscible blends with poly(vinyl acetate) (PVAc) and proposed a method to improve the stereocomplexation ability of PLLA and PDLA through miscible blending with the other polymer...
July 5, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28564367/organometallic-mediated-alternating-radical-copolymerization-of-tert-butyl-2-trifluoromethacrylate-with-vinyl-acetate-and-synthesis-of-block-copolymers-thereof
#20
Sanjib Banerjee, Vincent Ladmiral, Antoine Debuigne, Christophe Detrembleur, S M Wahidur Rahaman, Rinaldo Poli, Bruno Ameduri
Organometallic-mediated radical polymerization (OMRP) has given access to well-defined poly(vinyl acetate-alt-tert-butyl-2-trifluoromethacrylate)-b-poly(vinyl acetate) and poly(VAc-alt-MAF-TBE) copolymers composed of two electronically distinct monomers: vinyl acetate (VAc, donor, D) and tert-butyl-2-trifluoromethacrylate (MAF-TBE, acceptor, A), with low dispersity (≤1.24) and molar masses up to 57 000 g mol-1 . These copolymers have a precise 1:1 alternating structure over a wide range of comonomer feed compositions...
August 2017: Macromolecular Rapid Communications
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