keyword
MENU ▼
Read by QxMD icon Read
search

Self-expanding valve

keyword
https://www.readbyqxmd.com/read/28427320/the-role-of-inelastic-deformations-in-the-mechanical-response-of-endovascular-shape-memory-alloy-devices
#1
Lorenza Petrini, Alessandro Bertini, Francesca Berti, Giancarlo Pennati, Francesco Migliavacca
Nickel-titanium alloys are commonly adopted for producing cardiovascular minimally invasive devices such as self-expandable stents, aortic valves and stent-grafts. These devices are subjected to cyclic loads (due to blood pulsatility, leg or heart movements), that can induce fatigue fracture, and may also be subjected to very large deformations (due to crimping procedure, a tortuous physiological path or overloads), that can induce material yield. Recently, the authors developed a new constitutive model that considers inelastic strains due to not-completed reverse phase transformation (not all the stress-induced martensite turns back to austenite) or/and plasticity and their accumulation during cyclic loads...
May 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28411259/cerebral-embolic-protection-devices-during-transcatheter-aortic-valve-implantation-systematic-review-and-meta-analysis
#2
Rodrigo Bagur, Karla Solo, Saleh Alghofaili, Luis Nombela-Franco, Chun Shing Kwok, Samual Hayman, Reed A Siemieniuk, Farid Foroutan, Frederick A Spencer, Per O Vandvik, Tim G Schäufele, Mamas A Mamas
BACKGROUND AND PURPOSE: Silent ischemic embolic lesions are common after transcatheter aortic valve implantation (TAVI). The use of embolic protection devices (EPD) may reduce the occurrence of these embolic lesions. Thus, a quantitative overview and credibility assessment of the literature was necessary to draw a robust message about EPD. Therefore, the aim of this meta-analysis was to study whether the use of EPD reduces silent ischemic and clinically evident cerebrovascular events associated with TAVI...
April 14, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28400461/matched-comparison-of-self-expanding-transcatheter-heart-valves-for-the-treatment-of-failed-aortic-surgical-bioprosthesis-insights-from-the-valve-in-valve-international-data-registry-vivid
#3
Sami Alnasser, Asim N Cheema, Matheus Simonato, Marco Barbanti, Jeremy Edwards, Ran Kornowski, Eric Horlick, Harindra C Wijeysundera, Luca Testa, Francesco Bedogni, Hafid Amrane, Thomas Walther, Marc Pelletier, Azeem Latib, Jean-Claude Laborde, David Hildick-Smith, Won-Keun Kim, Didier Tchetche, Marco Agrifoglio, Jan-Malte Sinning, Ad J van Boven, Joëlle Kefer, Christian Frerker, Nicolas M van Mieghem, Axel Linke, Stephen Worthley, Anita Asgar, Carmelo Sgroi, Mina Aziz, Haim D Danenberg, Marino Labinaz, Ganesh Manoharan, Anson Cheung, John G Webb, Danny Dvir
BACKGROUND: Transcatheter valve-in-valve implantation is an established therapy for high-risk patients with failed surgical aortic bioprosthesis. There are limited data comparing outcomes of valve-in-valve implantation using different transcatheter heart valves (THV). METHODS AND RESULTS: Patients included in the Valve-in-Valve International Data registry (VIVID) and treated with self-expanding THV devices were analyzed using centralized core laboratory blinded to clinical events...
April 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28391759/current-treatment-of-tracheoesophageal-fistula
#4
Changzhi Zhou, Yi Hu, Yang Xiao, Wen Yin
Tracheoesophageal fistulas (TEFs) often occur with esophageal or bronchial carcinoma. Currently, we rely on implantation of delicate devices, such as self-expanding and silicone stents, in the esophagus or trachea to cover the fistula and expand the stenosis in order to relieve patient pain. However, because each case is different, our approach may not be effective for every patient. Consequently, new devices and technology have emerged to address these situations, such as degradable stents, Amplatzer(®) devices, endobronchial one-way umbrella-shaped valves, and transplantation of mesenchymal stem cells...
April 2017: Therapeutic Advances in Respiratory Disease
https://www.readbyqxmd.com/read/28385406/clinical-bioprosthetic-heart-valve-thrombosis-after-transcatheter-aortic%C3%A2-valve-replacement-incidence-characteristics-and-treatment-outcomes
#5
John Jose, Dmitriy S Sulimov, Mohamed El-Mawardy, Takao Sato, Abdelhakim Allali, Erik W Holy, Björn Becker, Martin Landt, Julia Kebernik, Bettina Schwarz, Gert Richardt, Mohamed Abdel-Wahab
OBJECTIVES: The aim of this study was to determine the incidence, characteristics, and treatment outcomes of patients diagnosed with clinical transcatheter heart valve thrombosis. BACKGROUND: Limited data exists on clinical or manifest transcatheter heart valve thrombosis. Prior studies have focused on subclinical thrombosis. METHODS: A retrospective analysis was conducted of prospectively collected data from a single-center registry that included 642 consecutive patients who underwent transcatheter aortic valve replacement between 2007 and 2015 (305 patients had self-expanding valves; balloon-expandable, n = 281; mechanically expanding, n = 56)...
April 10, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28377025/diastolic-mitral-regurgitation-following-transcatheter-aortic-valve-replacement-incidence-predictors-and-association-with-clinical-outcomes
#6
Nir Flint, Zach Rozenbaum, Simon Biner, Gad Keren, Shmuel Banai, Ariel Finkelstein, Yan Topilsky, Amir Halkin
BACKGROUND: Diastolic mitral regurgitation (DMR) results from atrioventricular conduction disturbances, acute aortic regurgitation, and/or marked elevation of left ventricular filling pressure. Generally benign, in some clinical circumstances DMR has presumed to result in hemodynamic decompensation. The aforementioned causes of DMR are frequently encountered in patients treated by transcatheter aortic valve replacement (TAVR) but its clinical significance in this setting has not been studied...
April 1, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28374279/design-analysis-and-testing-of-a-novel-mitral-valve-for-transcatheter-implantation
#7
Selim Bozkurt, Georgia L Preston-Maher, Ryo Torii, Gaetano Burriesci
Mitral regurgitation is a common mitral valve dysfunction which may lead to heart failure. Because of the rapid aging of the population, conventional surgical repair and replacement of the pathological valve are often unsuitable for about half of symptomatic patients, who are judged high-risk. Transcatheter valve implantation could represent an effective solution. However, currently available aortic valve devices are inapt for the mitral position. This paper presents the design, development and hydrodynamic assessment of a novel bi-leaflet mitral valve suitable for transcatheter implantation...
April 3, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28373593/maternal-antihypertensive-medication-use-and-congenital-heart-defects-updated-results-from-the-national-birth-defects-prevention-study
#8
Sarah C Fisher, Alissa R Van Zutphen, Martha M Werler, Angela E Lin, Paul A Romitti, Charlotte M Druschel, Marilyn L Browne
Previous NBDPS (National Birth Defects Prevention Study) findings from 1997 to 2003 suggested that maternal antihypertensive use was associated with congenital heart defects (CHDs). We re-examined associations between specific antihypertensive medication classes and specific CHDs with additional NBDPS data from 2004 to 2011. After excluding mothers missing hypertension information or who reported pregestational diabetes mellitus, a multiple birth, or antihypertensive use but no hypertension, we compared self-reported maternal exposure data on 10 625 CHD cases and 11 137 nonmalformed controls...
April 3, 2017: Hypertension
https://www.readbyqxmd.com/read/28355935/proof-of-concept-evaluation-of-the-sailvalve-self-expanding-deep-venous-valve-system-in-a-porcine-model
#9
Doeke Boersma, Aryan Vink, Frans L Moll, Gert J de Borst
PURPOSE: To evaluate the SailValve, a new self-expanding deep venous valve concept based on a single polytetrafluoroethylene cusp floating up and down in the bloodstream like a sail, acting as a flow regulator and allowing minimal reflux to reduce thrombogenicity. METHODS: Both iliac veins of 5 pigs were implanted with SailValve devices; the first animal was an acute pilot experiment to show the feasibility of accurately positioning the SailValve via a femoral access...
March 1, 2017: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/28331113/transcatheter-aortic-valve-replacement-with-different-valve-types-in-elliptic-aortic-annuli
#10
Yoshio Maeno, Yigal Abramowitz, Sung-Han Yoon, Hasan Jilaihawi, Sharma Raul, Sharjeel Israr, Masaki Miyasaka, Hiroyuki Kawamori, Yoshio Kazuno, Tanya Rami, Nobuyuki Takahashi, Geeteshwar Mangat, Mohammad Kashif, Tarun Chakravarty, Mamoo Nakamura, Wen Cheng, Raj R Makkar
BACKGROUND: The aim of this study was to determine the influence of an elliptic annulus on acute device success rates following self-expanding (SE) transcatheter aortic valve replacement (TAVR) vs. balloon-expandable (BE) TAVR.Methods and Results:Outcomes were assessed using Valve Academic Research Consortium-2 definitions. Aortic annulus ratio (AAR) was measured as short axis diameter/long axis diameter. Mean AAR was 0.81±0.06. Patients were therefore divided into 2 groups: AAR <0...
March 23, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28329312/first-experience-with-transfemoral-transcatheter-aortic-valve-implantation-without-prior-balloon-pre-dilatation-using-a-latest-generation-repositionable-and-retrievable-transcatheter-heart-valve%C3%A2
#11
Andreas Schaefer, Eva Harmel, Moritz Seiffert, Daniel Reichart, Florian Deuschl, Niklas Schofer, Yvonne Schneeberger, Stefan Blankenberg, Hermann Reichenspurner, Ulrich Schaefer, Lenard Conradi
OBJECTIVES: : The aim of this study was to prove technical feasibility and document haemodynamic and clinical outcomes of transcatheter aortic valve implantation (TAVI) with the latest generation repositionable and retrievable Lotus™ transcatheter heart valve (THV) without prior balloon-aortic valvuloplasty (BAV). It has been demonstrated for self-expandable and balloon-expandable THV that implantation without prior BAV is not only feasible and safe but also results in lower fluoroscopy times and amounts of contrast agent while yielding non-inferior haemodynamic and clinical outcome...
February 6, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28329078/apical-closure-device-for-full-percutaneous-transapical-valve-implantation-stress-test-in-an-animal-model%C3%A2
#12
Enrico Ferrari, Stefanos Demertzis, Jennifer Angelella, Denis Berdajs, Piergiorgio Tozzi, Tiziano Moccetti, Francesco Maisano, Ludwig K von Segesser
OBJECTIVES: Transapical valve implantation is traditionally performed through a left antero-lateral mini-thoracotomy. A self-expandable apical closure device has recently been developed for full-percutaneous transapical valve implantation. We performed haemodynamics stress-tests on an animal model to evaluate the sealing properties. METHODS: Under general anaesthesia 5 pigs (mean weight: 67 ± 6 Kg) received full heparinization (100 IU/Kg; activated clotting time >250 s and, through inferior mini-sternotomies, 21-Fr introducer sheaths for transapical aortic valve implantation (outer diameter: 25-Fr) were placed over-the-wire in the apexes...
January 31, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28321003/midterm-outcomes-with-a-self-expandable-transcatheter-heart-valve-in-japanese-patients-with-symptomatic-severe-aortic-stenosis
#13
Yoshiki Sawa, Kei Torikai, Junjiro Kobayashi, Hiroshi Niinami, Toru Kuratani, Koichi Maeda, Hideaki Kanzaki, Nobuyuki Komiyama, Yutaka Tanaka, Angie Zhang, Shigeru Saito
BACKGROUND: Transcatheter aortic valve implantation (TAVI) is a viable alternative to surgical aortic valve replacement in high-risk or inoperable patients with aortic stenosis (AS). Here we report the midterm outcomes of high-risk Japanese patients with severe AS who underwent TAVI with a self-expandable TAV.Methods and Results:The CoreValve Japan Trial was a prospective, multicenter trial of the CoreValve System. A group of 55 patients (mean age 82.5±5.5 years, 30.9% male, 100% NYHA class III/IV, STS 8...
March 17, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28318133/transcatheter-aortic-valve-implantation-with-the-self-expandable-venus-a-valve-and-corevalve-devices-preliminary-experiences-in-china
#14
COMPARATIVE STUDY
Yan-Biao Liao, Zhen-Gang Zhao, Xin Wei, Yuan-Ning Xu, Zhi-Liang Zuo, Yi-Jian Li, Ming-Xia Zheng, Yuan Feng, Mao Chen
BACKGROUND: Transcatheter aortic valve implantation (TAVI) has been demonstrated to be an effective alternative to surgical aortic valve replacement (SAVR) in patients with aortic stenosis who are deemed high risk or inoperable. Currently, TAVI procedures in China mostly make use of the domestic Venus A-Valve and the CoreValve; however, there is no data on their comparative performance. METHODS: Consecutive patients undergoing TAVI with the aforementioned devices were included...
March 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28304219/surgical-or-transcatheter-aortic-valve-replacement-in-intermediate-risk-patients
#15
Michael J Reardon, Nicolas M Van Mieghem, Jeffrey J Popma, Neal S Kleiman, Lars Søndergaard, Mubashir Mumtaz, David H Adams, G Michael Deeb, Brijeshwar Maini, Hemal Gada, Stanley Chetcuti, Thomas Gleason, John Heiser, Rüdiger Lange, William Merhi, Jae K Oh, Peter S Olsen, Nicolo Piazza, Mathew Williams, Stephan Windecker, Steven J Yakubov, Eberhard Grube, Raj Makkar, Joon S Lee, John Conte, Eric Vang, Hang Nguyen, Yanping Chang, Andrew S Mugglin, Patrick W J C Serruys, Arie P Kappetein
Background Although transcatheter aortic-valve replacement (TAVR) is an accepted alternative to surgery in patients with severe aortic stenosis who are at high surgical risk, less is known about comparative outcomes among patients with aortic stenosis who are at intermediate surgical risk. Methods We evaluated the clinical outcomes in intermediate-risk patients with severe, symptomatic aortic stenosis in a randomized trial comparing TAVR (performed with the use of a self-expanding prosthesis) with surgical aortic-valve replacement...
April 6, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28296065/direct-percutaneous-transaxillary-implantation-of-a-novel-self-expandable-transcatheter-heart-valve-for-aortic-stenosis
#16
Florian Deuschl, Niklas Schofer, Moritz Seiffert, Samer Hakmi, Isamu Mizote, Andreas Schaefer, Johannes Schirmer, Hermann Reichenspurner, Stefan Blankenberg, Lenard Conradi, Ulrich Schäfer
OBJECTIVES: The aim of this study was to evaluate safety, feasibility, and efficacy of transaxillary TAVI using a novel self-expandable transcatheter heart valve (THV) via a direct percutaneous technique. METHODS: The analysis comprises 12 consecutive patients with severe aortic stenosis treated with the ACURATE Neo™ THV (Symetis) by direct percutaneous transaxillary access. RESULTS: Patients presented with a mean age of 79.9 ± 6.2 years and high calculated surgical risk (logEuroSCORE I: 19...
March 15, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28296039/outcome-of-implantation-of-a-second-self-expanding-valve-for-the-treatment-of-residual-significant-aortic-regurgitation
#17
Edward Koifman, Nirav Patel, Gaby Weissman, Sarkis Kiramijyan, Romain Didier, Rebecca Torguson, Sandeep Kumar, Arpi Tavil-Shatelyan, Itsik Ben-Dor, Lowell F Satler, Augusto D Pichard, Ron Waksman
BACKGROUND: Residual aortic regurgitation (AR) following transcatheter aortic valve replacement (TAVR) is associated with adverse outcome. We sought to evaluate the efficacy and safety of second CoreValve (CV) implantation to treat residual AR following the initial CV deployment. METHODS AND RESULTS: TAVR patients treated with a second CV due to moderate and above residual AR were compared to single device implantation. Valvular function parameters were compared at baseline, post procedure, and 30 days...
March 15, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28290164/risk-factors-for-permanent-pacemaker-after-implantation-of-surgical-or-percutaneous-self-expanding-aortic-prostheses
#18
Emmanuel Villa, Alberto Clerici, Antonio Messina, Luca Testa, Francesco Bedogni, Andrea Moneta, Francesco Donatelli, Giovanni Troise
BACKGROUND: The use of transcatheter aortic valve implantation (TAVI) following the introduction of Nitinol autoexpandable devices has spread rapidly during recent years. In addition, cardiac surgery has been revolutionized due to the use of Nitinol-based sutureless prostheses for aortic valve replacement (AVR). During the same period, however, permanent pacemaker (PPM) implantation has emerged as a frequent complication. The study aim was to identify the risk factors of PPM following the implantation of a Nitinol self-expanding prosthesis (for AVR or TAVI)...
November 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28277896/resource-utilization-and-procedure-related-costs-associated-with-transfemoral-transcatheter-aortic-valve-replacement
#19
Holger Klein, Jana Boleckova
AIMS: Transcatheter aortic valve implantation (TAVI) is an alternative to surgical valve replacement for patients with aortic stenosis (AS). This study assessed the impact of changing from a self-expandable (SE) valve to a balloon-expandable (BE) valve on healthcare resource use and procedural costs in a population of inoperable AS patients. METHODS: In this retrospective single center study, data for 195 patients who received either an SE or a BE valve between 2010 and 2014 were collected...
March 9, 2017: Journal of Medical Economics
https://www.readbyqxmd.com/read/28277266/long-term-follow-up-of-patients-with-severe-aortic-stenosis-treated-with-a-self-expanding-prosthesis
#20
Pablo Avanzas, Isaac Pascual, Antonio J Muñoz-García, José Segura, Juan H Alonso-Briales, Javier Suárez de Lezo, Manuel Pan, Manuel F Jiménez-Navarro, José López-Aguilera, José M Hernández-García, César Morís
INTRODUCTION AND OBJECTIVES: Transcatheter aortic valve implantation (TAVI) is a safe and effective alternative to surgical treatment in patients with severe aortic stenosis (AS) and those who are inoperable or at high surgical risk. The primary objective of this study was to evaluate the long-term survival of consecutive patients with severe AS treated with TAVI. METHODS: Observational, multicenter, prospective, follow-up study of consecutive patients with severe symptomatic AS treated by TAVI in 3 high-volume hospitals in Spain...
October 28, 2016: Revista Española de Cardiología
keyword
keyword
14712
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"