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Mechanical assist device

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https://www.readbyqxmd.com/read/28716615/development-of-a-protocol-for-successful-palliative-care-consultation-in-population-of-patients-receiving-mechanical-circulatory-support
#1
Shilpee Sinha, Carey Belcher, Alexia Torke, Joycelyn Howard, Marco Caccamo, James A Slaven, Irmina Gradus-Pizlo
BACKGROUND: In 2014, Joint Commission recommended palliative care (PC) engagement in ventricular assist device (VAD) implantation as destination therapy. Limited information is available on established PC protocols in the mechanical circulatory support (MCS) population. MEASURES: The goals of our PC consultation were to document advance care planning (ACP) discussions and designate a surrogate decision maker (SDM) prior to MCS implantation. A retrospective analysis compared the frequency of PC consults, ACP discussion, and SDM before and after protocol implementation...
July 14, 2017: Journal of Pain and Symptom Management
https://www.readbyqxmd.com/read/28711029/an-oxygen-independent-and-membrane-less-glucose-biobattery-supercapacitor-hybrid-device
#2
Xinxin Xiao, Peter Ó Conghaile, Dónal Leech, Roland Ludwig, Edmond Magner
Enzymatic biofuel cells can generate electricity directly from the chemical energy of biofuels in physiological fluids, but their power density is significantly limited by the performance of the cathode which is based on oxygen reduction for in vivo applications. An oxygen-independent and membrane-less glucose biobattery was prepared that consists of a dealloyed nanoporous gold (NPG) supported glucose dehydrogenase (GDH) bioanode, immobilised with the assistance of conductive polymer/Os redox polymer composites, and a solid-state NPG/MnO2 cathode...
July 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28709930/particle-image-velocimetry-study-of-the-celiac-trunk-hemodynamic-induced-by-continuous-flow-left-ventricular-assist-device
#3
Francesco Scardulla, Diego Bellavia, Leonardo D'Acquisto, Giuseppe M Raffa, Salvatore Pasta
Whereas left ventricular assist device (LVAD) is the gold-standard therapy for patients with heart failure, gastrointestinal bleeding is one of the most common complications. LVAD implantation may remarkably impact aortic hemodynamics so that experimental and computational flow analyses can be used to study the disease mechanisms. Here we present an experimentally-calibrated computational model of the celiac trunk hemodynamic of a LVAD-supported patient who experienced bleeding after device implantation. Specifically, both particle image velocimetry (PIV) and echocardiography were used to measure and compare flow distributions in each branch of a phantom model of the patient abdominal aorta...
July 12, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28708210/particle-image-velocimetry-tests-on-pediatric-45-cc-and-30-cc-ventricle-assist-devices-effects-of-heart-rate-on-vad-operation
#4
Dariusz Witkowski, Damian Obidowski, Piotr Reorowicz, Daniel Jodko, Krzysztof Jozwik
BACKGROUND: This study investigated flow analysis inside pediatric ventricle assist devices (VADs) designed and manufactured at the Foundation for Cardiac Surgery Development (FRK), Zabrze, Poland. The main goal of the experiment was to define the minimal heart rate admissible in clinical practice. METHODS: The flow was directed by mechanical, single-disc valves developed at the Lodz University of Technology, Institute of Turbomachinery in Lodz, Poland. VAD operation conditions under different heart rates were analyzed...
July 8, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28707188/hemodynamic-benefits-of-counterpulsation-implantable-percutaneous-and-intraaortic-rotary-blood-pumps-an-in-silico-and-in-vitro-study
#5
Yu Wang, Steven C Koenig, Michael A Sobieski, Mark S Slaughter, Guruprasad A Giridharan
Mechanical circulatory support (MCS) devices have become a standard therapy for heart failure (HF) patients. MCS device designs may differ by level of support, inflow and/or outflow cannulation sites, and mechanism(s) of cardiac unloading and blood flow delivery. Investigation and direct comparison of hemodynamic parameters that help characterize performance of MCS devices has been limited. We quantified cardiac and vascular hemodynamic responses for different types of MCS devices. Continuous flow (CF) left ventricular (LV) assist devices (LVAD) with LV or left atrial (LA) inlet, counterpulsation devices, percutaneous CF LVAD, and intra-aortic rotary blood pumps (IARBP) were quantified using established computer simulation and mock flow loop models...
July 13, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28706587/management-of-ventricular-tachycardia-storm-in-patients-with-structural-heart-disease
#6
REVIEW
Daniele Muser, Pasquale Santangeli, Jackson J Liang
Electrical storm (ES) is a medical emergency characterized by repetitive episodes of sustained ventricular arrhythmias (VAs) in a limited amount of time (at least 3 within a 24-h period) leading to repeated appropriate implantable cardioverter defibrillator therapies. The occurrence of ES represents a major turning point in the natural history of patients with structural heart disease being associated with poor short- and long-term survival particularly in those with compromised left ventricular ejection fraction (LVEF) that can develop hemodynamic decompensation and multi-organ failure...
June 26, 2017: World Journal of Cardiology
https://www.readbyqxmd.com/read/28705316/cell-specific-pathways-supporting-persistent-fibrosis-in-heart-failure
#7
Stephen D Farris, Creighton Don, Deri Helterline, Christopher Costa, Tabitha Plummer, Susanne Steffes, Claudius Mahr, Nahush A Mokadam, April Stempien-Otero
BACKGROUND: Only limited data exist describing the histologic and noncardiomyocyte function of human myocardium in end-stage heart failure (HF). OBJECTIVES: The authors sought to determine changes in noncardiomyocyte cellular activity in patients with end-stage HF after left ventricular assist device (LVAD)-induced remodeling to identify mechanisms impeding recovery. METHODS: Myocardium was obtained from subjects undergoing LVAD placement and/or heart transplantation...
July 18, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28699526/hydrogel-based-cell-therapies-for-kidney-regeneration-current-trends-in-biofabrication-and-in-vivo-repair
#8
Katja Jansen, Carl C L Schuurmans, Jitske Jansen, Rosalinde Masereeuw, Tina Vermonden
Facing the problems of limited renal regeneration capacity and the persistent shortage of donor kidneys, dialysis remains the only treatment option for many end-stage renal disease patients. Unfortunately, dialysis is only a medium-term solution because large and protein-bound uremic solutes are not efficiently cleared from the body and lead to disease progression over time. Current strategies for improved renal replacement therapies (RRTs) range from whole organ engineering to biofabrication of renal assist devices and biological injectables for in vivo regeneration...
July 10, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28692527/sildenafil-in-left-ventricular-assist-device-is-safe-and-well-tolerated
#9
Ashwin K Ravichandran, Shane J LaRue, Eric Novak, Susan A Joseph, Joel D Schilling
Right heart failure is a potentially devastating complication of mechanical circulatory support, occurring at a rate of 0.49 events per 100 patient-months. Pulmonary vasodilators such as phosphodiesterase-5 inhibitors (PDE5i) have been frequently used to unload the right ventricle in left ventricular assist device (LVAD) patients, but there is scant evidence to support this practice. The purpose of this analysis is to provide additional data regarding the safety and efficacy of the PDE5i sildenafil in a real world population of patients supported with LVADs at Washington University in St...
July 7, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28691693/influence-of-physico-mechanical-properties-of-elastomeric-material-for-different-cell-growth
#10
Jyoti Wala, Debashis Maji, Soumen Das
The tunable mechanical and physical properties of Polydimethylsiloxane (PDMS) are commonly utilized for studying cellular dynamics. However, the inherent hydrophobic nature of PDMS limits its application as cell culture films. Various surface modification techniques render PDMS films hydrophilic which alters the surface chemistry, elasticity, roughness and cell attachment of anchorage dependent cell types to the films. The surface properties of thin film lead to alteration in bio-mechano-physical properties of cells and therefore could be used as mechanical signature for viability testing of different normal and cancerous cells...
July 10, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28685878/few-atomic-layered-lithium-cathode-materials-to-achieve-ultrahigh-rate-capability-in-lithium-ion-batteries
#11
Zhixin Tai, Chandrasekar M Subramaniyam, Shu-Lei Chou, Lingna Chen, Hua-Kun Liu, Shi-Xue Dou
The most promising cathode materials, including LiCoO2 (layered), LiMn2 O4 (spinel), and LiFePO4 (olivine), have been the focus of intense research to develop rechargeable lithium-ion batteries (LIBs) for portable electronic devices. Sluggish lithium diffusion, however, and unsatisfactory long-term cycling performance still limit the development of present LIBs for several applications, such as plug-in/hybrid electric vehicles. Motivated by the success of graphene and novel 2D materials with unique physical and chemical properties, herein, a simple shear-assisted mechanical exfoliation method to synthesize few-layered nanosheets of LiCoO2 , LiMn2 O4 , and LiFePO4 is used...
July 7, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28685751/meniscus-assisted-solution-printing-of-large-grained-perovskite-films-for-high-efficiency-solar-cells
#12
Ming He, Bo Li, Xun Cui, Beibei Jiang, Yanjie He, Yihuang Chen, Daniel O'Neil, Paul Szymanski, Mostafa A Ei-Sayed, Jinsong Huang, Zhiqun Lin
Control over morphology and crystallinity of metal halide perovskite films is of key importance to enable high-performance optoelectronics. However, this remains particularly challenging for solution-printed devices due to the complex crystallization kinetics of semiconductor materials within dynamic flow of inks. Here we report a simple yet effective meniscus-assisted solution printing (MASP) strategy to yield large-grained dense perovskite film with good crystallization and preferred orientation. Intriguingly, the outward convective flow triggered by fast solvent evaporation at the edge of the meniscus ink imparts the transport of perovskite solutes, thus facilitating the growth of micrometre-scale perovskite grains...
July 7, 2017: Nature Communications
https://www.readbyqxmd.com/read/28682718/the-ventricular-assist-device-in-the-life-of-the-child-a-phenomenological-pediatric-study
#13
Michael A van Manen
What is it like for a child to live with an artificial heart? The use of some medical therapies in children requires developmental considerations, is associated with psychosocial consequences, and calls for ethical sensitivities. A critical case is the ventricular assist device (VAD), a mechanical pump used to support the functioning of a failing heart. As a pediatric therapy, the device can be used as a temporary solution for poor heart function, a bridge to transplantation or recovery, or as a destination therapy...
May 2017: Qualitative Health Research
https://www.readbyqxmd.com/read/28680967/a-continuum-robot-and-control-interface-for-surgical-assist-in-fetoscopic-interventions
#14
George Dwyer, Francois Chadebecq, Marcel Tella Amo, Christos Bergeles, Efthymios Maneas, Vijay Pawar, Emanuel Vander Poorten, Jan Deprest, Sebastien Ourselin, Paolo De Coppi, Tom Vercauteren, Danail Stoyanov
Twin-twin transfusion syndrome requires interventional treatment using a fetoscopically introduced laser to sever the shared blood supply between the fetuses. This is a delicate procedure relying on small instrumentation with limited articulation to guide the laser tip and a narrow field of view to visualize all relevant vascular connections. In this letter, we report on a mechatronic design for a comanipulated instrument that combines concentric tube actuation to a larger manipulator constrained by a remote centre of motion...
March 8, 2017: IEEE Robotics and Automation Letters
https://www.readbyqxmd.com/read/28680268/driveline-infection-in-ventricular-assist-devices-and-its-implication-in-the-present-era-of-destination-therapy
#15
REVIEW
Gabriel A Hernandez, Jonatan D Nunez Breton, Sandra V Chaparro
Advances in mechanical circulatory support devices provided the technology to develop long-term, implantable left ventricular assist devices as bridge to transplant, destination therapy, and in a lesser group of patients, as bridge to recovery. Despite the benefits from this innovative therapy, with their increased use, many complications have been encountered, one of the most common being infections. With the driveline acting as a portal to the exterior environment, an infection involving this structure is the most frequent one...
2017: Open Journal of Cardiovascular Surgery
https://www.readbyqxmd.com/read/28675296/restoring-the-electrical-properties-of-cvd-graphene-via-physisorption-of-molecular-adsorbates
#16
Kishan Thodkar, Damien Thompson, Felix Lüönd, Lucas Moser, Frédéric Overney, Laurent Marot, Christian Schönenberger, Blaise Jeanneret, Michel Calame
Chemical vapor deposition (CVD) is a powerful technique to produce graphene for large-scale applications. Polymer-assisted wet transfer is commonly used to move the graphene onto silicon substrates, but the resulting devices tend to exhibit p-doping, which decreases the device quality and reproducibility. In an effort to better understand the origin of this effect, we coated graphene with n-methyl-2-pyrrolidone (NMP) and hexamethyldisilazane (HMDS) molecules that exhibit negligible charge transfer to graphene but bind more strongly to graphene than ambient adsorbents...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28673108/melody-transcatheter-pulmonary-valve-placement-in-a-heartmate-ii-patient
#17
Tabitha G Moe, Linda Staley, Joseph N Graziano
Transcatheter pulmonary valve placement is emerging as a standard therapy for dysfunctional right ventricular outflow tract conduits. The Melody transcatheter pulmonary valve is indicated for use in the management of pediatric and adult patients with right ventricular outflow tract conduits measuring at least 16 mm in diameter. This is the first reported case of placement in a patient with a left ventricular assist device. We outline the preprocedural evaluation process, the procedural methods, and the outcomes of a successful implantation in a complex patient...
January 1, 2017: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/28671475/computational-synthesis-of-mos2-layers-by-reactive-molecular-dynamics-simulations-initial-sulfidation-of-moo3-surfaces
#18
Sungwook Hong, Aravind Krishnamoorthy, Pankaj Rajak, Subodh Tiwari, Masaaki Misawa, Fuyuki Shimojo, Rajiv K Kalia, Aiichiro Nakano, Priya Vashishta
Transition metal dichalcogenides (TMDC) like MoS2 are promising candidates for next-generation electric and optoelectronic devices. These TMDC monolayers are typically synthesized by chemical vapor deposition (CVD). However, despite significant amount of empirical work on this CVD growth of monolayered crystals, neither experiment nor theory has been able to decipher mechanisms of selection rules for different growth scenarios, or make predictions of optimized environmental parameters and growth factors. Here, we present an atomic-scale mechanistic analysis of the initial sulfidation process on MoO3 surfaces using first-principles-informed ReaxFF reactive molecular dynamics (RMD) simulations...
July 6, 2017: Nano Letters
https://www.readbyqxmd.com/read/28667297/the-electro-optic-mechanism-and-infrared-switching-dynamic-of-the-hybrid-multilayer-vo2-al-zno-heterojunctions
#19
Peng Zhang, Wu Zhang, Junyong Wang, Kai Jiang, Jinzhong Zhang, Wenwu Li, Jiada Wu, Zhigao Hu, Junhao Chu
Active and widely controllable phase transition optical materials have got rapid applications in energy-efficient electronic devices, field of meta-devices and so on. Here, we report the optical properties of the vanadium dioxide (VO2)/aluminum-doped zinc oxide (Al:ZnO) hybrid n-n type heterojunctions and the corresponding electro-optic performances of the devices. Various structures are fabricated to compare the discrepancy of the optical and electrical characteristics. It was found that the reflectance spectra presents the wheel phenomenon rather than increases monotonically with temperature at near-infrared region range...
June 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28661911/pump-in-parallel-mechanical-assistance-of-partial-cavopulmonary-circulation-using-a-conventional-ventricular-assist-device
#20
Pranava Sinha, Nina Deutsch, Kanishka Ratnayaka, Dingchao He, Murfad Peer, Mustafa Kurkluoglu, Mark Nuszkowski, Erin Montague, Gerald Mikesell, David Zurakowski, Richard Jonas
Mechanical assistance of systemic single ventricle is effective in pulling blood through a cavopulmonary circuit. In patients with superior cavopulmonary connection, this strategy can lead to arterial desaturation secondary to increased inferior caval flow. We hypothesized that overall augmentation in cardiac output with mechanical assistance compensates for the drop in oxygen saturation thereby maintaining tissue oxygen delivery (DO2). Bidirectional Glenn (BDG) was established in seven swine (25 kg) after a common atrium had been established by balloon septostomy...
June 15, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
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