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Self-expanding valve

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https://www.readbyqxmd.com/read/28219851/understanding-the-requirements-of-self-expandable-stents-for-heart-valve-replacement-radial-force-hoop-force-and-equilibrium
#1
María Sol Cabrera, Cees W J Oomens, Frank P T Baaijens
A proper interpretation of the forces developed during stent crimping and deployment is of paramount importance for a better understanding of the requirements for successful heart valve replacement. The present study combines experimental and computational methods to assess the performance of a nitinol stent for tissue-engineered heart valve implantation. To validate the stent model, the mechanical response to parallel plate compression and radial crimping was evaluated experimentally. Finite element simulations showed good agreement with the experimental findings...
February 7, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28214795/pre-implantation-balloon-aortic-valvuloplasty-and-clinical-outcomes-following-transcatheter-aortic-valve-implantation-a-propensity-score-analysis-of-the-uk-registry
#2
Glen P Martin, Matthew Sperrin, Rodrigo Bagur, Mark A de Belder, Iain Buchan, Mark Gunning, Peter F Ludman, Mamas A Mamas
BACKGROUND: Aortic valve predilation with balloon aortic valvuloplasty (BAV) is recommended before transcatheter aortic valve implantation (TAVI), despite limited data around the requirement of this preprocedural step and the potential risks of embolization. This study aimed to investigate the trends in practice and associations of BAV on short-term outcomes in the UK TAVI registry. METHODS AND RESULTS: Eleven clinical endpoints were investigated, including 30-day mortality, myocardial infarction, aortic regurgitation, valve dysfunction, and composite early safety...
February 18, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28183467/initial-experience-of-a-second-generation-self-expanding-transcatheter-aortic-valve-the-uk%C3%A2-ireland-evolut-r-implanters-registry
#3
Sundeep S Kalra, Sami Firoozi, James Yeh, Daniel J Blackman, Shabnam Rashid, Simon Davies, Neil Moat, Miles Dalby, Tito Kabir, Saib S Khogali, Richard A Anderson, Peter H Groves, Darren Mylotte, David Hildick-Smith, Rajiv Rampat, Jan Kovac, Ashan Gunarathne, Jean-Claude Laborde, Stephen J Brecker
OBJECTIVES: The authors present the UK and Irish real-world learning curve experience of the Evolut R transcatheter heart valve. BACKGROUND: The Evolut R is a self-expanding, repositionable, and fully recapturable second-generation transcatheter heart valve with several novel design features to improve outcomes and reduce complications. METHODS: Clinical, procedural, and 30-day outcome data were prospectively collected for the first 264 patients to receive the Evolut R valve in the United Kingdom and Ireland...
February 13, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28183466/early-clinical-outcomes-after-transcatheter%C3%A2-aortic-valve-replacement-using-a-novel-self-expanding-bioprosthesis%C3%A2-in%C3%A2-patients-with-severe%C3%A2-aortic%C3%A2-stenosis-who-are-suboptimal%C3%A2-for%C3%A2-surgery-results-of-the-evolut-r-u-s-study
#4
Jeffrey J Popma, Michael J Reardon, Kamal Khabbaz, J Kevin Harrison, G Chad Hughes, Susheel Kodali, Isaac George, G Michael Deeb, Stan Chetcuti, Robert Kipperman, John Brown, Hongyan Qiao, James Slater, Mathew R Williams
OBJECTIVES: This study sought to evaluate this transcatheter aortic valve (TAV) bioprosthesis in patients who are poorly suitable for surgical aortic valve (AV) replacement. BACKGROUND: A novel self-expandable TAV bioprosthesis was designed to provide a low-profile delivery system, conformable annular sealing, and the ability to resheath and reposition during deployment. METHODS: The Evolut R U.S. study included 241 patients with severe aortic stenosis who were deemed to be at least high risk for surgery treated at 23 clinical sites in the United States...
February 13, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28153349/comparison-of-outcomes-of-balloon-expandable-versus-self-expandable-transcatheter-heart-valves-for-severe-aortic-stenosis
#5
Harindra C Wijeysundera, Feng Qiu, Maria Koh, Treesa J Prasad, Warren J Cantor, Asim Cheema, Michael W A Chu, Andrew Czarnecki, Christopher Feindel, Stephen E Fremes, Kori J Kingsbury, Madhu K Natarajan, Mark Peterson, Marc Ruel, Bradley Strauss, Dennis T Ko
Transcatheter aortic valve implantation (TAVI) is the treatment of choice for inoperable and high-risk patients with severe aortic stenosis. Our objectives were to elucidate potential differences in clinical outcomes and safety between balloon-expandable versus self-expandable transcatheter heart valves (THV). We performed a retrospective cohort study of all transfemoral TAVI procedures in Ontario, Canada, from 2007 to 2013. Patients were categorized into either balloon-expandable or self-expandable THV groups...
January 5, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28145874/comparative-matched-outcome-of-evolut-r-vs-corevalve-transcatheter-aortic-valve-implantation
#6
Uri Landes, Tamir Bental, Alon Barsheshet, Abid Assali, Hana Vaknin Assa, Amos Levi, Katia Orvin, Ran Kornowski
OBJECTIVES: The Evolut-R (Medtronic, Inc) is a transcatheter aortic valve implantation (TAVI) system that was built on the well-established foundation of Medtronic's CoreValve device platform. Although already in extensive clinical utilization, it is unknown if the Evolut-R improves TAVI outcomes. Herein, we compared TAVI outcomes of the Evolut-R and CoreValve devices. METHODS: A propensity score 1:1 matching was conducted on 358 Evolut-R patients (n = 75) and CoreValve patients (n = 283)...
February 2017: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/28145286/spin-diffusion-and-torques-in-disordered-antiferromagnets
#7
Aurelien Manchon
We have developed a drift-diffusion equation of spin transport in collinear bipartite metallic antiferromagnets. Starting from a model tight-binding Hamiltonian, we obtain the quantum kinetic equation within Keldysh formalism and expand it to the lowest order in spatial gradient using Wigner expansion method. In the diffusive limit, these equations track the spatio-temporal evolution of the spin accumulations and spin currents on each sublattice of the antiferromagnet. We use these equations to address the nature of the spin transfer torque in (i) a spin-valve composed of a ferromagnet and an antiferromagnet, (ii) a metallic bilayer consisting of an antiferromagnet adjacent to a heavy metal possessing spin Hall effect, and in (iii) a single antiferromagnet possessing spin Hall effect...
March 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28145041/first-in-human-experience-of-a-new-self-expandable-percutaneous-pulmonary-valve-implantation-using-knitted-nitinol-wire-and-tri-leaflet-porcine-pericardial-valve-in-the-native-right-ventricular-outflow-tract
#8
Gi Beom Kim, Bo Sang Kwon, Hong Gook Lim
Balloon-expandable percutaneous pulmonary valve systems using the Melody and Edwards SAPIEN transcatheter heart valves have been increasingly used instead of surgically implantable pulmonary valves. However, limited patients with right ventricular outflow tract (RVOT) lesions are suitable candidates for percutaneous pulmonary valve implantation (PPVI) using these systems after surgical correction of tetralogy of Fallot. Therefore, larger self-expandable valved-stents are being developed for native RVOT lesions...
February 1, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28109558/choice-of-balloon-expandable-versus-self-expanding-transcatheter-aortic-valve-impacts-hemodynamics-differently-according-to-aortic-annular-size
#9
Toby Rogers, Arie Steinvil, Jiaxiang Gai, Rebecca Torguson, Edward Koifman, Sarkis Kiramijyan, Smita Negi, Sang Yeub Lee, Petros Okubagzi, Lowell F Satler, Itsik Ben-Dor, Augusto D Pichard, Ron Waksman
We sought to determine whether balloon-expandable valve (BEV) and self-expanding valve (SEV) affect valve hemodynamics differently according to native aortic annulus size. Transcatheter aortic valve replacement can achieve superior prosthetic valve hemodynamics compared with surgical aortic valve replacement, particularly in patients with small aortic annulus. One hundred ninety-three consecutive transcatheter aortic valve replacement patients were grouped into tertiles defined by computed tomography derived aortic annulus systolic perimeter...
December 18, 2016: American Journal of Cardiology
https://www.readbyqxmd.com/read/28105999/transcatheter-aortic-valve-replacement-with-the-portico-valve-one-year-results-of-the-early-canadian-experience
#10
Gidon Y Perlman, Anson Cheung, Eric Dumont, Dion Stub, Danny Dvir, Maria Del Trigo, Marc Pelletier, Sami Alnasser, Jian Ye, David Wood, Christopher Thompson, Philipp Blanke, Jonathon Leipsic, Michael A Seidman, Heather LeBlanc, Christopher E Buller, Josep Rodés-Cabau, John G Webb
AIMS: The aim of this study was to examine the short- and medium-term outcomes of transcatheter aortic valve replacement (TAVR) with the self-expanding and repositionable Portico valve (St. Jude Medical, St. Paul, MN, USA). METHODS AND RESULTS: A total of 57 patients underwent TAVR with the Portico valve between March 2012 and August 2014, representing the first-in-human experience and the entire early experience in Canada. Patients were followed up at 30 days and one year with repeat echocardiography and clinical review...
January 20, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28104211/balloon-post-dilation-following-implantation-of-a-self-expanding-transcatheter-aortic-valve%C3%A2-bioprosthesis
#11
J Kevin Harrison, G Chad Hughes, Michael J Reardon, Robert Stoler, Paul Grayburn, Robert Hebeler, David Liu, Yanping Chang, Jeffrey J Popma
OBJECTIVES: This study sought to explore the impact of balloon post-dilation (BPD) on outcomes in the CoreValve US Clinical Trials. BACKGROUND: BPD following transcatheter aortic valve replacement (TAVR) has been used in selected cases to optimize hemodynamic results. METHODS: Procedural details of 3,532 patients were examined to determine whether BPD was performed after self-expanding TAVR. "Best practice" guidelines recommended BPD for treatment of suboptimal intraprocedural valve function, primarily manifested by moderate or severe residual aortic regurgitation (AR)...
January 23, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28078734/coronary-procedures-after-tavi-with-the-self-expanding-aortic-bioprosthesis-medtronic-corevalve%C3%A2-not-an-easy-matter
#12
Madjid Boukantar, Romain Gallet, Gauthier Mouillet, Abdelkaoui Belarbi, Vladimir Rubimbura, Julien Ternacle, Jean-Luc Dubois-Rande, Emmanuel Teiger
OBJECTIVES: To evaluate the feasibility of coronary procedures after transcatheter aortic valve implantation (TAVI) with the CoreValve™ device. BACKGROUND: Due to its design, CoreValve™ prosthesis may interfere with coronary procedures. Data on this issue are sparse. METHODS: Between 2007 and 2015, 550 patients underwent CoreValve™ TAVI in our hospital. Among them, 16 underwent coronary angiogram after TAVI and were included in our retrospective study...
February 2017: Journal of Interventional Cardiology
https://www.readbyqxmd.com/read/28074827/the-perceval-s-aortic-valve-implantation-in-patients-with-porcelain-aorta-is-this-ideal-option
#13
Nikolaos G Baikoussis, Panagiotis Dedeilias, Efstathia Prappa, Michalis Argiriou
We would like to present in this paper a patient with severe aortic valve stenosis referred to our department for surgical aortic valve replacement. In this patient, it was intraoperatively detected an unexpected heavily calcified porcelain ascending aorta. We present the treatment options in this situation, the difficulties affronted intraoperatively, the significance of the preoperative chest computed tomography scan and the use of the Perceval S aortic valve as ideal bioprosthesis implantation. This is a self-expanding, self-anchoring, and sutureless valve with a wide indication in all patients requiring aortic bioprosthesis...
January 2017: Annals of Cardiac Anaesthesia
https://www.readbyqxmd.com/read/28073571/early-clinical-outcomes-of-a-novel-self-expanding-transapical-transcatheter-aortic-valve-bioprosthesis
#14
Michael W A Chu, Rodrigo Bagur, Katie L Losenno, Philip M Jones, Pantelis Diamantouros, Patrick Teefy, Jill J Gelinas, Bob Kiaii
OBJECTIVE: Coronary obstruction remains a challenging complication of transcatheter aortic valve replacement; however, a new self-expanding transapical prosthesis may reduce this risk. The purpose of this study was to evaluate the early 1-year outcomes of patients with low coronary heights who received the Acurate TA bioprosthesis (Symetis, Ecublens, Switzerland). METHODS: Between May 2014 and April 2015, 30 consecutive patients (aged 85 ± 6 years, 63% were female, Society of Thoracic Surgeons score 8...
December 15, 2016: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28073567/the-influence-of-native-aortic-valve-calcium-and-transcatheter-valve-oversize-on-the-need-for-pacemaker-implantation-after-transcatheter-aortic-valve-insertion
#15
Fu'ad Al-Azzam, Kevin L Greason, Chayakrit Krittanawong, Eric E Williamson, Christopher J McLeod, Katherine S King, Verghese Mathew
OBJECTIVE: Native aortic valve calcium and transcatheter aortic valve oversize have been reported to predict pacemaker implantation after transcatheter aortic valve insertion. We reviewed our experience to better understand the association. METHODS: We retrospectively reviewed the records of 300 patients with no prior permanent pacemaker implantation who underwent transcatheter aortic valve insertion from November 2008 to February 2015. Valve oversize was calculated using area...
November 29, 2016: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28067197/comparison-of-procedural-and-clinical-outcomes-with-evolut-r-versus-medtronic-corevalve-a-swiss-tavi-registry-analysis
#16
Stephane Noble, Stefan Stortecky, Dik Heg, David Tuller, Raban Jeger, Stefan Toggweiler, Enrico Ferrari, Fabian Nietlispach, Maurizio Taramasso, Francesco Maisano, Jürg Grünenfelder, Peter Jüni, Christoph Huber, Thierry Carrel, Stephan Windecker, Peter Wenaweser, Marco Roffi
AIMS: Data on procedural and clinical outcomes after transcatheter aortic valve implantation (TAVI) with the new generation self-expanding Medtronic Evolut-R prosthesis in comparison with its predecessor, the Medtronic CoreValve, are scarce. METHODS AND RESULTS: In a nationwide, prospective, multi-center cohort study outcomes of consecutive transfemoral TAVI patients treated with the new- generation Medtronic Evolut-R (September 2014 - February 2016) and the Medtronic CoreValve (February 2011 - February 2016) were investigated...
January 10, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28040318/transcatheter-mitral-valve-replacement-for-patients-with-symptomatic%C3%A2-mitral%C3%A2-regurgitation-a-global-feasibility-trial
#17
David W M Muller, Robert Saeid Farivar, Paul Jansz, Richard Bae, Darren Walters, Andrew Clarke, Paul A Grayburn, Robert C Stoler, Gry Dahle, Kjell A Rein, Marty Shaw, Gregory M Scalia, Mayra Guerrero, Paul Pearson, Samir Kapadia, Marc Gillinov, Augusto Pichard, Paul Corso, Jeffrey Popma, Michael Chuang, Philipp Blanke, Jonathon Leipsic, Paul Sorajja
BACKGROUND: Symptomatic mitral regurgitation (MR) is associated with high morbidity and mortality that can be ameliorated by surgical valve repair or replacement. Despite this, many patients with MR do not undergo surgery. Transcatheter mitral valve replacement (TMVR) may be an option for selected patients with severe MR. OBJECTIVES: This study aimed to examine the effectiveness and safety of TMVR in a cohort of patients with native valve MR who were at high risk for cardiac surgery...
January 31, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28028692/in-vitro-hydrodynamic-assessment-of-a-new-transcatheter-heart-valve-concept-the-triskele
#18
Benyamin Rahmani, Spyros Tzamtzis, Rose Sheridan, Michael J Mullen, John Yap, Alexander M Seifalian, Gaetano Burriesci
This study presents the in vitro hydrodynamic assessment of the TRISKELE, a new system suitable for transcatheter aortic valve implantation (TAVI), aiming to mitigate the procedural challenges experienced with current technologies. The TRISKELE valve comprises three polymeric leaflet and an adaptive sealing cuff, supported by a novel fully retrievable self-expanding nitinol wire frame. Valve prototypes were manufactured in three sizes of 23, 26, and 29 mm by automated dip-coating of a biostable polymer, and tested in a hydrodynamic bench setup in mock aortic roots of 21, 23, 25, and 27 mm annulus, and compared to two reference valves suitable for equivalent implantation ranges: Edwards SAPIEN XT and Medtronic CoreValve...
December 27, 2016: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/28026742/transcatheter-aortic-valve-replacement-for-the-treatment-of-pure-native-aortic%C3%A2-valve-regurgitation-a-systematic-review
#19
Anna Franzone, Raffaele Piccolo, George C M Siontis, Jonas Lanz, Stefan Stortecky, Fabien Praz, Eva Roost, René Vollenbroich, Stephan Windecker, Thomas Pilgrim
OBJECTIVES: This study sought to summarize available evidence on transcatheter aortic valve replacement (TAVR) for the treatment of native pure aortic regurgitation (AR). BACKGROUND: Surgical aortic valve replacement (SAVR) is the gold standard for the treatment of AR. However, case series of high-risk patients undergoing TAVR for native pure AR were reported. METHODS: We systematically searched Medline, Embase, and Scopus for reports of at least 5 patients with native pure AR undergoing TAVR...
November 28, 2016: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28025751/influence-of-continuously-evolving-transcatheter-aortic-valve-implantation-technology-on-cerebral-oxygenation
#20
Ward Eertmans, Cornelia Genbrugge, Tom Fret, Maud Beran, Kim Engelen, Herbert Gutermann, Margot Vander Laenen, Willem Boer, Bert Ferdinande, Frank Jans, Jo Dens, Cathy De Deyne
This study assessed the influence of the evolution in Transcatheter Aortic Valve Implantation technology on cerebral oxygenation. Cerebral oxygenation was measured continuously with Near-Infrared Spectroscopy and compared retrospectively between balloon-expandable, self-expandable and differential deployment valves which were implanted in 12 (34%), 17 (49%) and 6 patients (17%), respectively. Left and right SctO2 values were averaged at four time points and used for analysis (i.e. at baseline, balloon-aortic valvuloplasty, valve deployment, and at the end of the procedure)...
December 26, 2016: Journal of Clinical Monitoring and Computing
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