keyword
MENU ▼
Read by QxMD icon Read
search

Assistance devices

keyword
https://www.readbyqxmd.com/read/28655192/right-ventricular-dysfunction-after-surgical-left-ventricular-restoration-prevalence-risk-factors-and-clinical-implications
#1
Lotte E Couperus, Victoria Delgado, Marieke E van Vessem, Laurens F Tops, Meindert Palmen, Jerry Braun, Harriëtte F Verwey, Robert J M Klautz, Martin J Schalij, Saskia L M A Beeres
OBJECTIVES: Surgical left ventricular (LV) restoration (SVR) induces changes in LV systolic and diastolic function that may affect postoperative right ventricular (RV) function. This study aimed to evaluate the long-term effect of SVR on RV function, with specific focus on determinants and prognostic implications of RV dysfunction. METHODS: Eighty-six patients (age 60 ± 10 years, 73% male) with clinical and echocardiographic follow-up 2 years after SVR were included...
June 23, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28654280/molecular-beam-epitaxy-of-gan-nanowires-on-epitaxial-graphene
#2
Sergio Fernandez-Garrido, Manfred Ramsteiner, Guanhui Gao, Lauren A Galves, Bharat Sharma, Pierre Corfdir, Gabriele Calabrese, Ziani de Souza Schiaber, Carsten Pfüller, Achim Trampert, Joao Marcelo J Lopes, Oliver Brandt, Lutz Geelhaar
We demonstrate an all-epitaxial and scalable growth approach to fabricate single-crystalline GaN nanowires on graphene by plasma-assisted molecular beam epitaxy. As substrate, we explore several types of epitaxial graphene layer structures synthesized on SiC. The different structures differ mainly in their total number of graphene layers. Because graphene is found to be etched under active N exposure, the direct growth of GaN nanowires on graphene is only achieved on multilayer graphene structures. The analysis of the nanowire ensembles prepared on multilayer graphene by Raman spectroscopy and transmission electron microscopy reveals the presence of graphene underneath as well as in between nanowires, as desired for the use of this material as contact layer in nanowire-based devices...
June 27, 2017: Nano Letters
https://www.readbyqxmd.com/read/28652649/bleeding-with-the-artificial-heart-gastrointestinal-hemorrhage-in-cf-lvad-patients
#3
EDITORIAL
Grigoriy E Gurvits, Elena Fradkov
Continuous-flow left ventricular assist devices (CF-LVADs) have significantly improved outcomes for patients with end-stage heart failure when used as a bridge to cardiac transplantation or, more recently, as destination therapy. However, its implantations carries a risk of complications including infection, device malfunction, arrhythmias, right ventricular failure, thromboembolic disease, postoperative and nonsurgical bleeding. A significant number of left ventricular assist devices (LVAD) recipients may experience recurrent gastrointestinal hemorrhage, mainly due to combination of antiplatelet and vitamin K antagonist therapy, activation of fibrinolytic pathway, acquired von Willebrand factor deficiency, and tendency to develop small intestinal angiodysplasias due to increased rotary speed of the pump...
June 14, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28652572/cascaded-exciton-energy-transfer-in-a-monolayer-semiconductor-lateral-heterostructure-assisted-by-surface-plasmon-polariton
#4
Jinwei Shi, Meng-Hsien Lin, I-Tung Chen, Nasim Mohammadi Estakhri, Xin-Quan Zhang, Yanrong Wang, Hung-Ying Chen, Chun-An Chen, Chih-Kang Shih, Andrea Alù, Xiaoqin Li, Yi-Hsien Lee, Shangjr Gwo
Atomically thin lateral heterostructures based on transition metal dichalcogenides have recently been demonstrated. In monolayer transition metal dichalcogenides, exciton energy transfer is typically limited to a short range (~1 μm), and additional losses may be incurred at the interfacial regions of a lateral heterostructure. To overcome these challenges, here we experimentally implement a planar metal-oxide-semiconductor structure by placing a WS2/MoS2 monolayer heterostructure on top of an Al2O3-capped Ag single-crystalline plate...
June 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28651907/tumor-necrosis-factor-%C3%AE-levels-and-non-surgical-bleeding-in-continuous-flow-left-ventricular-assist-devices
#5
Corey E Tabit, Mitchell J Coplan, Phetcharat Chen, Valluvan Jeevanandam, Nir Uriel, James K Liao
BACKGROUND: Non-surgical bleeding (NSB) due to angiodysplasia is common in left ventricular assist device (LVAD) patients. Thrombin-induced angiopoietin-2 (Ang-2) expression in LVAD patients leads to altered angiogenesis and is associated with lower angiopoietin-1 (Ang-1) and increased NSB. However, the mechanism for decreased Ang-1, made by pericytes, is unknown and the origin of thrombin in LVAD patients is unclear. We hypothesized that high tumor necrosis factor-α (TNF-α) levels in LVAD patients induce pericyte apoptosis, tissue factor (TF) expression and vascular instability...
June 8, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/28651783/optimal-timing-of-heart-transplant-after-heartmate-ii-left-ventricular-assist-device-implantation
#6
Robert J Steffen, Eugene H Blackstone, Nicholas G Smedira, Edward G Soltesz, Katherine J Hoercher, Lucy Thuita, Randall C Starling, Maria Mountis, Nader Moazami
BACKGROUND: Optimal timing of heart transplantation in patients supported with second-generation left ventricular assist devices (LVADs) is unknown. Despite this, patients with LVADs continue to receive priority on the heart transplant waiting list. Our objective was to determine the optimal timing of transplantation for patients bridged with continuous-flow LVADs. METHODS: A total of 301 HeartMate II LVADs (Thoratec Corp, Pleasanton, CA) were implanted in 285 patients from October 2004 to June 2013, and 86 patients underwent transplantation through the end of follow-up...
June 24, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28651755/miniscrew-assisted-customized-lingual-appliances-for-predictable-treatment-of-skeletal-class-ii-malocclusion-with-severe-deep-overbite-and-overjet
#7
Xue-Dong Wang, Fei-Fei Lei, Da-Wei Liu, Jie-Ni Zhang, Wei-Tao Liu, Yang Song, Yan-Heng Zhou
This report describes the use of miniscrew-assisted customized lingual fixed appliances in a patient with severe skeletal Class II malocclusion. The patient was a 12-year-old Chinese girl with the chief complaint of protrusive lips and anterior teeth. Her diagnosis included a skeletal Class II relationship with maxillary protrusion, a backward-rotated mandible, a full Angle Class II molar relationship, and severe deep overjet and overbite. Four premolars were extracted, and miniscrew anchorage was placed in the maxillary posterior lingual segment to provide maximum anchorage and to achieve vertical control of the intruding molars...
July 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28651485/intraoperative-left-atrium-inversion-after-implantation-of-heartmate-iii-ventricular-assist-device
#8
Ayşegül Ozgök, Z Asli Demir, Gökçe Sert, Doğan Sert, Zehra Gölbaşı, Umit Kervan
We report here a case of left atrium inversion after implanting HeartMate III LVAD, which is known to be the first in literature. LVAD can be functional only if there is adequate inflow to the device. Parameters and filling of left ventricle can be assessed by TEE. In our case, initial examination with TEE showed thrombus like images. HeartMate III has a reliable algorithm that automatically reduces pump speed if 'suction effect' is detected. HeartMate III demonstrates clean flow properties and good surface wash...
June 27, 2017: Acta Chirurgica Belgica
https://www.readbyqxmd.com/read/28651347/minimally-invasive-centrimag-ventricular-assist-device-support-integrated-with-extracorporeal-membrane-oxygenation-in-cardiogenic-shock-patients-a-comparison-with-conventional-centrimag-biventricular-support-configuration
#9
Koji Takeda, Arthur R Garan, Masahiko Ando, Jiho Han, Veli K Topkara, Paul Kurlansky, Melana Yuzefpolskaya, Maryjane A Farr, Paolo C Colombo, Yoshifumi Naka, Hiroo Takayama
OBJECTIVES: We recently developed a novel minimally invasive surgical approach that combines extracorporeal membrane oxygenation and CentriMag ventricular assist device (Ec-VAD) for the treatment of cardiogenic shock as a short-term circulatory support. We compared the outcomes of this new approach to conventional CentriMag biventricular assist device (BiVAD) support through a median sternotomy. METHODS: Between July 2015 and August 2016, 22 patients were implanted with CentriMag Ec-VAD and 90 patients were implanted with conventional CentriMag BiVAD...
June 22, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28650852/techniques-for-endoscopic-retrograde-cholangiopancreatography-in-altered-gastrointestinal-anatomy
#10
Tom G Moreels
PURPOSE OF REVIEW: This review highlights the current status of endoscopic retrograde cholangiopancreatography (ERCP) techniques in patients with altered anatomy. Endoscopic treatment of biliopancreatic disorders is particularly challenging in patients with altered anatomy. RECENT FINDINGS: There are two main approaches to perform ERCP in patients with altered anatomy: the transluminal access and the transmural access. The transluminal access uses device-assisted enteroscopy (DAE) to reach and cannulate the biliopancreatic system...
June 24, 2017: Current Opinion in Gastroenterology
https://www.readbyqxmd.com/read/28650647/highly-efficient-and-stable-sn-rich-perovskite-solar-cells-by-introducing-bromine
#11
Seojun Lee, Dong-Won Kang
Compositional engineering of recently-arising methylammonium (MA) lead (Pb) halide based perovskites is an essential approach for finding better perovskite compositions to resolve still remaining issues of toxic Pb, and long-term instability, etc. In this work, we carried out crystallographic, morphological, optical, and photovoltaic characterization of compositional MASn0.6Pb0.4I3-xBrx by gradually introducing bromine (Br) into parental Pb-Sn binary perovskite (MASn0.6Pb0.4I3) to elucidate its function in Sn-rich (Sn : Pb = 6 : 4) perovskites...
June 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28649147/multiblock-high-order-large-eddy-simulation-of-powered-fontan-hemodynamics-towards-computational-surgery
#12
Yann T Delorme, Mark D Rodefeld, Steven H Frankel
Children born with only one functional ventricle must typically undergo a series of three surgeries to obtain the so-called Fontan circulation in which the blood coming from the body passively flows from the Vena Cavae (VCs) to the Pulmonary Arteries (PAs) through the Total Cavopulmonary Connection (TCPC). The circulation is inherently inefficient due to the lack of a subpulmonary ventricle. Survivors face the risk of circulatory sequelae and eventual failure for the duration of their lives. Current efforts are focused on improving the outcomes of Fontan palliation, either passively by optimizing the TCPC, or actively by using mechanical support...
January 17, 2017: Computers & Fluids
https://www.readbyqxmd.com/read/28648437/utility-of-adjunctive-modalities-in-coronary-chronic-total-occlusion-intervention
#13
REVIEW
Hemal Bhatt, Sean Janzer, Jon C George
Coronary chronic total occlusion (CTO) intervention remains one of the most challenging domains in interventional cardiology. Due to the technical challenges involved and potential procedural complications, CTO percutaneous coronary intervention (PCI) attempt and success rates remain less than standard PCI. However, the use of several adjunctive tools such as intravascular ultrasound, optical coherence tomography, rotational atherectomy, orbital atherectomy, excimer laser coronary atherectomy and percutaneous left ventricular assist device may contribute to improved CTO PCI success rates or provide better hemodynamic assessment of CTO lesion (i...
May 2017: Indian Heart Journal
https://www.readbyqxmd.com/read/28646914/markerless-motion-capture-systems-as-training-device-in-neurological-rehabilitation-a-systematic-review-of-their-use-application-target-population-and-efficacy
#14
REVIEW
Els Knippenberg, Jonas Verbrugghe, Ilse Lamers, Steven Palmaers, Annick Timmermans, Annemie Spooren
BACKGROUND: Client-centred task-oriented training is important in neurological rehabilitation but is time consuming and costly in clinical practice. The use of technology, especially motion capture systems (MCS) which are low cost and easy to apply in clinical practice, may be used to support this kind of training, but knowledge and evidence of their use for training is scarce. The present review aims to investigate 1) which motion capture systems are used as training devices in neurological rehabilitation, 2) how they are applied, 3) in which target population, 4) what the content of the training and 5) efficacy of training with MCS is...
June 24, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28645834/left-ventricular-assist-device-therapy-for-destination-therapy-is-less-invasive-surgery-a-safe-alternative
#15
Sebastian V Rojas, Jasmin S Hanke, Murat Avsar, Philipp R Ahrens, Ove Deutschmann, Kirstin A Tümler, Aitor Uribarri, Sara Rojas-Hernández, Pedro L Sánchez, José M González-Santos, Axel Haverich, Jan D Schmitto
INTRODUCTION AND OBJECTIVES: The number of older patients with congestive heart failure has dramatically increased. Because of stagnating cardiac transplantation, there is a need for an alternative therapy, which would solve the problem of insufficient donor organ supply. Left ventricular assist devices (LVADs) have recently become more commonly used as destination therapy (DT). Assuming that older patients show a higher risk-profile for LVAD surgery, it is expected that the increasing use of less invasive surgery (LIS) LVAD implantation will improve postoperative outcomes...
June 20, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/28645826/continuous-flow-ventricular-assist-device-support-in-children-a-paradigm-change
#16
EDITORIAL
Iki Adachi
No abstract text is available yet for this article.
May 25, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28645602/clinical-application-of-insertion-force-sensor-system-for-coil-embolization-of-intracranial-aneurysms
#17
Noriaki Matsubara, Shigeru Miyachi, Takashi Izumi, Hiroyuki Yamada, Naoki Marui, Keisuke Ota, Hayato Tajima, Kazunori Shintai, Masashi Ito, Tasuku Imai, Masahiro Nishihori, Toshihiko Wakabayashi
INTRODUCTION: In endovascular embolization for intracranial aneurysms, it is important to properly control the coil insertion force. However, the force can only be subjectively detected by the subtle feedback experienced by the neurointerventionists at their fingertips. The authors envisioned a system that would objectively sense and quantify that force. In this article, coil insertion force was measured in cases of intracranial aneurysm using this sensor, and its actual clinical application was investigated...
June 20, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28644683/use-of-percutaneous-left-ventricular-assist-device-impella-in-vasodilatory-poison-induced-shock
#18
JoAn R Laes, Chad Olinger, Jon B Cole
No abstract text is available yet for this article.
June 23, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28643961/bioelectroventing-an-electrochemical-assisted-bioremediation-strategy-for-cleaning-up-atrazine-polluted-soils
#19
Ainara Domínguez-Garay, Jose Rodrigo Quejigo, Ulrike Dörfler, Reiner Schroll, Abraham Esteve-Núñez
The absence of suitable terminal electron acceptors (TEA) in soil might limit the oxidative metabolism of environmental microbial populations. Bioelectroventing is a bioelectrochemical strategy that aims to enhance the biodegradation of a pollutant in the environment by overcoming the electron acceptor limitation and maximizing metabolic oxidation. Microbial electroremediating cells (MERCs) are devices that can perform such a bioelectroventing. We also report an overall profile of the (14) C-ATR metabolites and (14) C mass balance in response to the different treatments...
June 23, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28643335/a-review-of-hemolysis-prediction-models-for-computational-fluid-dynamics
#20
REVIEW
Hai Yu, Sebastian Engel, Gábor Janiga, Dominique Thévenin
Flow-induced hemolysis is a crucial issue for many biomedical applications; in particular, it is an essential issue for the development of blood-transporting devices such as left ventricular assist devices, and other types of blood pumps. In order to estimate red blood cell (RBC) damage in blood flows, many models have been proposed in the past. Most models have been validated by their respective authors. However, the accuracy and the validity range of these models remains unclear. In this work, the most established hemolysis models compatible with computational fluid dynamics of full-scale devices are described and assessed by comparing two selected reference experiments: a simple rheometric flow and a more complex hemodialytic flow through a needle...
June 23, 2017: Artificial Organs
keyword
keyword
88586
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"