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https://www.readbyqxmd.com/read/28058268/early-results-of-a-novel-mitral-valve-repair-procedure-the-interpapillary-polytetrafluoroethylene-bridge-formation
#1
Nasri Alotti, Károly Gombocz, Kiddy L Ume, Amer Sayour, Daniel Alejandro Lerman, Aref Rashed
BACKGROUND: Surgical repair of ischemic mitral regurgitation (IMR) associated with chordal rupture in patients with ischemic cardiomyopathy is challenging as it aims to correct several structural pathologies at once. There are ongoing studies evaluating multiple approaches, however long term results are still scarce. METHODS AND RESULTS: 19 patients with IMR underwent mitral valve repair with interpapillary polytetrafluoroethylene (PTFE) bridge and neochordae formation at the Zala County Teaching Hospital...
February 12, 2016: International Journal of Cardiovascular Research
https://www.readbyqxmd.com/read/28056170/self-sterilized-flexible-single-electrode-triboelectric-nanogenerator-for-energy-harvesting-and-dynamic-force-sensing
#2
Huijuan Guo, Tao Li, Xiaotao Cao, Jin Xiong, Yang Jie, Magnus Willander, Xia Cao, Ning Wang, Zhong Lin Wang
Triboelectric nanogenerators (TENGs) offer great opportunities to deploy advanced wearable electronics that integrate a power generator and smart sensor, which eliminates the associated cost and sustainability concerns. Here, an embodiment of such integrated platforms has been presented in a graphene oxide (GO) based single-electrode TENG (S-TENG). The as-designed multifunctional device could not only harvest tiny bits of mechanical energy from ambient movements with a high power density of 3.13 W·m(-2) but also enable detecting dynamic force with an excellent sensitivity of about 388 μA·MPa(-1)...
January 9, 2017: ACS Nano
https://www.readbyqxmd.com/read/28049865/adherence-of-volatile-propofol-to-various-types-of-plastic-tubing
#3
Felix Maurer, Dominik Lorenz, Gianluca Pielsticker, Thomas Volk, Daniel Sessler, Joerg Baumbach, Sascha Kreuer
Propofol is an intravenous anesthetic. Currently, it is not possible to routinely measure blood concentration of the drug in real time. However, multi-capillary column ion-mobility spectrometry (MCC-IMS) of exhaled gas can estimate blood propofol concentration. Unfortunately, adhesion of volatile propofol on plastic materials complicates measurements. Therefore, it is necessary to consider the extent to which volatile propofol adheres to various plastics used in sampling tubing. Perfluoralkoxy (PFA), polytetrafluorethylene (PTFE), polyurethane (PUR), silicone, and Tygon tubing were investigated in an experimental setting using a calibration gas generator (HovaCAL)...
January 4, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28043462/right-ventricular-outflow-tract-reconstruction-with-a-polytetrafluoroethylene-monocusp-valve-a-20-year-experience
#4
Mohineesh Kumar, Mark W Turrentine, Mark D Rodefeld, Teresa Bell, John W Brown
In patients with tetralogy of Fallot (TOF), pulmonary atresia (PA), and other congenital right ventricular outflow tract (RVOT) malformations, polytetrafluoroethylene (PTFE) monocusp outflow tract patches (MOTP) relieve obstruction and provide pulmonary valve competence. The purpose of this study was to determine whether our PTFE-MOTP was an acceptable short- and mid-term remedy for patients with TOF or PA as assessed by freedom from severe pulmonary regurgitation and freedom from reoperation. From 1994-2014, 171 patients (mean age 1...
July 2016: Seminars in Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28033076/a-simplified-technique-for-interventional-extracardiac-fontan
#5
Sudesh Prabhu, Ben Anderson, Cameron Ward, Tom Karl, Nelson Alphonso
PURPOSE: We report a simple technique for an interventional extracardiac Fontan (ECF) procedure. DESCRIPTION: At the preparatory stage along with a bidirectional cavopulmonary connection (BCPC; cardiopulmonary bypass), a short piece of polytetrafluoroethylene (PTFE) tube graft is anastomosed to the inferior surface of the right pulmonary artery. Another longer PTFE graft is anastomosed to the transected inferior vena cava (IVC). A large medial opening in the lower PTFE graft is anastomosed to an atriotomy...
January 2017: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/28007450/a-review-of-open-and-endovascular-treatment-of-superior-vena-cava-syndrome-of-benign-aetiology
#6
REVIEW
G S Sfyroeras, C N Antonopoulos, G Mantas, K G Moulakakis, J D Kakisis, E Brountzos, C R Lattimer, G Geroulakos
BACKGROUND: The widespread use of central venous catheters, ports, pacemakers, and defibrillators has increased the incidence of benign superior vena cava syndrome (SVCS). This study aimed at reviewing the results of open and endovascular treatment of SVCS. METHOD: Medical literature databases were searched for relevant studies. Studies with more than five adult patients, reporting separate results for the SVC were included. Nine studies reported the results of endovascular treatment of SVCS including 136 patients followed up for a mean of 11-48 months...
December 19, 2016: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28004596/combination-of-photocatalytic-and-membrane-distillation-hybrid-processes-for-reactive-dyes-treatment
#7
H Cengiz Yatmaz, Nadir Dizge, Merve Sezen Kurt
In this study, the degradation of azo dye solutions (Reactive Red 180 and Reactive Orange 16) of textile industry wastewater was investigated for using innovative hybrid process of photocatalytic and membrane distillation (MD) processes. Photocatalytic oxidation was conducted with semiconductor catalysts (ZnO and TiO2) and their mixture under UVA and UVC irradiation. More effective results were obtained under UVA at the initial stages of the reactions for both dye solutions. ZnO and TiO2 catalysts have given similar efficient results, but results with ZnO were better at initial stages...
January 19, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28003678/usefulness-of-thoracoscopic-debridement-for-chronic-empyema-after-an-extrapleural-pneumonectomy
#8
Hidejiro Torigoe, Shinichi Toyooka, Hiromasa Yamamoto, Junichi Soh, Shinichiro Miyoshi
We present the case of a 65-year-old Japanese man diagnosed with chronic empyema (without a bronchopleural fistula) that occurred 7 months after he underwent an extrapleural pneumonectomy for right malignant pleural mesothelioma (MPM). Following thoracic drainage and irrigation for 1 month, we performed surgery by a thoracoscopic approach, in light of his general condition. We performed debridement and removal of the Gore-Tex polytetrafluoroethylene (PTFE) patch that had been used for the reconstruction of the diaphragm and the pericardium...
December 2016: Acta Medica Okayama
https://www.readbyqxmd.com/read/27991563/reversible-self-actuated-thermo-responsive-pore-membrane
#9
Younggeun Park, Maria Paz Gutierrez, Luke P Lee
Smart membranes, which can selectively control the transfer of light, air, humidity and temperature, are important to achieve indoor climate regulation. Even though reversible self-actuation of smart membranes is desirable in large-scale, reversible self-regulation remains challenging. Specifically, reversible 100% opening/closing of pore actuation showing accurate responsiveness, reproducibility and structural flexibility, including uniform structure assembly, is currently very difficult. Here, we report a reversible, thermo-responsive self-activated pore membrane that achieves opening and closing of pores...
December 19, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27988159/antimicrobial-bonded-graft-patency-in-the-setting-of-a-polymicrobial-infection-in-swine-sus-scrofa
#10
Michael S Clemens, Mamie C Stull, Kai W Hata, Thomas A Heafner, J Devin B Watson, Zachary M Arthurs, Brandon W Propper
BACKGROUND: Polytetrafluoroethylene (PTFE) and Dacron are commonly used as arterial conduits in vascular trauma or infection when vein interposition graft may not be available. This study used a previously validated large animal model of polymicrobial infection to assess the patency and infectious resistance of a novel, antibiotic-impregnated graft material compared with PTFE and Dacron. METHODS: Forty-eight animals were placed into five groups for a 21-day survival period...
December 14, 2016: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/27976846/engineering-hydrophobic-organosilica-nanoparticle-doped-nanofibers-for-enhanced-and-fouling-resistant-membrane-distillation
#11
Mohammed Amen Hammami, Jonas G Croissant, Lijo Francis, Shahad K Alsaiari, Dalaver H Anjum, Noreddine Ghaffour, Niveen M Khashab
Engineering and scaling-up new materials for better water desalination are imperative to find alternative fresh water sources to meet future demands. Herein, the fabrication of hydrophobic poly(ether imide) composite nanofiber membranes doped with novel ethylene-pentafluorophenylene-based periodic mesoporous organosilica nanoparticles is reported for enhanced and fouling resistant membrane distillation. Novel organosilica nanoparticles were homogeneously incorporated into electrospun nanofiber membranes depicting a proportional increase of hydrophobicity to the particle contents...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27899178/choice-of-a-hemodynamic-model-for-occlusive-thrombosis-in-arteries
#12
David N Ku, Lauren D C Casa, Susan M Hastings
Intravascular thrombosis can lead to heart attacks and strokes that together are the leading causes of death in the US (Kochanek, K.D., Murphy, S.L., Xu, J.Q., 2014). The ability to identify the offending biofluid mechanical conditions and predict the timescale of thrombotic occlusion in vessels and devices may improve patient outcomes. A computational model was developed to describe the growth of thrombus based on the local hemodynamic shear rate. The model predicts thrombus deposition based on initial geometric and fluid mechanical conditions, which are updated throughout the simulation to reflect the changing lumen dimensions...
January 4, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/27895379/functional-outcomes-after-successful-lower-extremity-arterial-injuries-repair
#13
Ziad Sophie, Lekhraj Mal
The study was conducted to measure functional outcome of patients who had successful lower extremity arterial reconstruction after vascular injury at a tertiary care centre in Karachi over 5 years from January 2008 to December 2013. In this descriptive cohort study, the functional outcomes were assessed with lower extremity functional scale (LEFS). The mean age the 75 patients in the study was 32±11 years. Limb salvage was successful in 72(96%) cases. The most common injured artery was superficial femoral artery 30(40%) followed by popliteal artery 19(25%)...
October 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/27885511/does-anticoagulation-therapy-prevent-thrombosis-in-coronary-stent-grafts
#14
Yuki Honda, Kohei Wakabayashi, Takayasu Suzuki, Hiroshi Suzuki
A polytetrafluoroethylene (PTFE)-covered stent was deployed for enlarging coronary aneurysms in a 73-year-old man. Optical coherence tomography (OCT) and coronary angioscopy performed 3 months later revealed naked stent struts and thin patches of red thrombi covering the PTFE membrane even under dual antiplatelet therapy (DAPT). After 5-month warfarin administration under DAPT, OCT and angioscopy showed a clear extinction of the thin patches of red thrombi on the PTFE membrane and stent struts, although most of the struts were still naked...
November 24, 2016: Cardiovascular Intervention and Therapeutics
https://www.readbyqxmd.com/read/27884494/consensus-conference-on-tips-management-techniques-indications-contraindications
#15
Stefano Fagiuoli, Raffaele Bruno, Wilma Debernardi Venon, Filippo Schepis, Francesco Vizzutti, Pierluigi Toniutto, Marco Senzolo, Paolo Caraceni, Francesco Salerno, Paolo Angeli, Roberto Cioni, Alessandro Vitale, Maurizio Grosso, Andrea De Gasperi, Gennaro D'Amico, Alfredo Marzano
The trans jugular intrahepatic Porto systemic shunt (TIPS) is no longer viewed as a salvage therapy or a bridge to liver transplantation and is currently indicated for a number of conditions related to portal hypertension with positive results in survival. Moreover, the availability of self-expandable polytetrafluoroethylene (PTFE)-covered endoprostheses has dramatically improved the long-term patency of TIPS. However, since the last updated International guidelines have been published (year 2009) new evidence have come, which have open the field to new indications and solved areas of uncertainty...
October 29, 2016: Digestive and Liver Disease
https://www.readbyqxmd.com/read/27878578/the-double-guidewire-approach-for-transcoronary-pacing-in-a%C3%A2-porcine-model
#16
K M Heinroth, S Unverzagt, D Mahnkopf, S Frantz, R Prondzinsky
BACKGROUND: Transcoronary pacing is used for treatment of unheralded bradycardias in the setting of percutaneous coronary interventions (PCI). OBJECTIVES: In the present study we introduced a new concept - the double guidewire approach - for transcoronary pacing in a porcine model. METHODS: Transcoronary pacing was applied in 16 adult pigs under general anaesthesia in an animal catheterization laboratory. A special guidewire with electrical insulation by PTFE coating except for the distal part of the guidewire was positioned in the periphery of a coronary artery serving as the cathode...
November 23, 2016: Medizinische Klinik, Intensivmedizin und Notfallmedizin
https://www.readbyqxmd.com/read/27870923/covering-the-implant-prosthesis-screw-access-hole-a-biological-approach-to-material-selection-and-technique
#17
Todd Schoenbaum, Chandur Wadhwani, Richard Stevenson
The traditional material for covering the implant abutment screw is cotton. As the implant-abutment junction flexes and wears overtime, leakage from the oral environment penetrates into the screw access chamber where the cotton pellet is located. The cotton serves as a scaffolding for the proliferation of anaerobic bacteria in the warm, oxygen free environment. The bacterial exudate causes foul odors and may cause additional inflammation of the peri-implant tissues. The use of PTFE tape or PVS impression material serves the same role as the cotton pellet, but forms a better seal and limits bacterial growth inside the implant and abutment...
November 21, 2016: Journal of Oral Implantology
https://www.readbyqxmd.com/read/27853264/a-simple-design-for-microwave-assisted-digestion-vessel-with-low-reagent-consumption-suitable-for-food-and-environmental-samples
#18
Mehrdad Gholami, Shima Behkami, Sharifuddin Md Zain, Sezgin Bakirdere
The objective of this work is to prepare a cost-effective, low reagent consumption and high performance polytetrafluoroethylene (PTFE) vessel that is capable to work in domestic microwave for digesting food and environmental samples. The designed vessel has a relatively thicker wall compared to that of commercial vessels. In this design, eight vessels are placed in an acrylonitrile butadiene styrene (ABS) holder to keep them safe and stable. This vessel needs only 2.0 mL of HNO3 and 1.0 mL H2O2 to digest 100 mg of biological sample...
November 17, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27834419/limitations-and-options-using-resorbable-versus-nonresorbable-membranes-for-successful-guided-bone-regeneration
#19
Nikolaos K Soldatos, Popi Stylianou, Vasiliki P Koidou, Nikola Angelov, Raymond Yukna, Georgios E Romanos
OBJECTIVE: Deficient bony ridges often complicate the implant treatment plan. Several treatment modalities are used to regenerate bone, including guided bone regeneration (GBR). The purpose of this study was to summarize the knowledge on different types of membranes available and currently used in GBR procedures in a staged approach or with simultaneous implant placement. The primary role of the membranes is to exclude epithelial and connective tissue cells from the wound area to be regenerated, and to create and maintain the space into which pluripotential and osteogenic cells are free to migrate...
November 10, 2016: Quintessence International
https://www.readbyqxmd.com/read/27829903/the-in-situ-generation-and-reactive-quench-of-diazonium-compounds-in-the-synthesis-of-azo-compounds-in-microreactors
#20
Faith M Akwi, Paul Watts
In this paper, a micro-fluidic optimized process for the continuous flow synthesis of azo compounds is presented. The continuous flow synthesis of Sudan II azo dye was used as a model reaction for the study. At found optimal azo coupling reaction temperature and pH an investigation of the optimum flow rates of the reactants for the diazotization and azo coupling reactions in Little Things Factory-MS microreactors was performed. A conversion of 98% was achieved in approximately 2.4 minutes and a small library of azo compounds was thus generated under these reaction conditions from couplers with aminated or hydroxylated aromatic systems...
2016: Beilstein Journal of Organic Chemistry
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