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mechanical valve prostheses

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https://www.readbyqxmd.com/read/28914661/percutaneous-aortic-leak-closure-in-a-small-and-frail-annulus-after-double-heart-valve-replacement
#1
Guglielmo Saitto, Paolo Nardi, Gian P Ussia, Domenico Sergi, Paolo Prati, Marco Russo, Francesco Romeo, Giovanni Ruvolo
: Paravalvular leak (PVL) is an uncommon but serious complication associated with the implantation of prosthetic valves. Following aortic valve replacement, up to 5% of patients affected by PVL develop clinical symptoms of heart failure, hemolysis or both. Percutaneous treatment of PVL has emerged instead of conventional surgery, as a well tolerated and less invasive procedure but remains a challenge. We present the case of a young woman with mechanical aortic and mitral prostheses, who presented surgical aortic PVL caused by a serious frailty of native annulus, became symptomatic after 5 months and was successfully percutaneously treated with an Amplatzer Duct Occluder device...
September 12, 2017: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/28885378/radial-force-an-underestimated-parameter-in-oversizing-transcatheter-aortic-valve-replacement-prostheses-in-vitro-analysis-with-five-commercialized-valves
#2
Sandrine Egron, Buntaro Fujita, Lucía Gullón, Pott Désirée, Thomas Schmitz-Rode, Stephan Ensminger, Ulrich Steinseifer
The goal is to inform in depth on transcatheter aortic valve replacement (TAVR) prosthesis mechanical behavior, depending on frame type, design, and size, and how it crucially impacts the oversizing issue in clinical use, and ultimately the procedure outcome. Transcatheter aortic valve replacement is an established therapy for high-risk patients suffering from aortic stenosis, and the indication for TAVR is progressively expanding to intermediate-risk patients. Choosing the optimal oversizing degree is crucial to safely anchor the TAVR valve-which involves limiting the risks for embolism, aortic regurgitation, conductance disturbance, or annulus rupture-and to increase the valve prosthesis performance...
September 5, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28867011/tavr-with-mechanically-expandable-prostheses-is-balloon-aortic-valvuloplasty-really-necessary
#3
Giuseppe Tarantini, Luca Nai Fovino, Paola Tellaroli, Paola Purita, Giulia Masiero, Massimo Napodano, Chiara Fraccaro, Gino Gerosa, Sabino Iliceto
BACKGROUND: The fully retrievable and repositionable Lotus Valve System uses a unique mechanical expansion mechanism. Balloon aortic valvuloplasty (BAV) is recommended before valve deployment. There are no studies focusing on feasibility and efficacy of Lotus Valve implantation without previous BAV. METHODS AND RESULTS: Thirty consecutive patients (63.3% female; mean age, 80±6.2years) underwent transcatheter aortic valve replacement (TAVR) with the Lotus Valve without preparatory BAV...
November 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28853220/hemodynamic-evaluation-of-a-biological-and-mechanical-aortic-valve-prosthesis-using-patient-specific-mri-based-cfd
#4
Florian Hellmeier, Sarah Nordmeyer, Pavlo Yevtushenko, Jan Bruening, Felix Berger, Titus Kuehne, Leonid Goubergrits, Marcus Kelm
Modeling different treatment options before a procedure is performed is a promising approach for surgical decision making and patient care in heart valve disease. This study investigated the hemodynamic impact of different prostheses through patient-specific MRI-based CFD simulations. Ten time-resolved MRI data sets with and without velocity encoding were obtained to reconstruct the aorta and set hemodynamic boundary conditions for simulations. Aortic hemodynamics after virtual valve replacement with a biological and mechanical valve prosthesis were investigated...
August 29, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28840950/3d-transesophageal-echocardiography-and-radiography-of-mitral-valve-prostheses-and-repairs
#5
REVIEW
Nadia Jafar, Michael J Moses, Ricardo J Benenstein, Alan F Vainrib, James N Slater, Henry A Tran, Robert Donnino, Mathew R Williams, Muhamed Saric
This paper provides a comprehensive overview of 3D transesophageal echocardiography still images and movies of mechanical mitral valves, mitral bioprostheses, and mitral valve repairs. Alongside these visual descriptions, the historical overview of surgical and percutaneous mitral valve intervention is described with the special emphasis on the incremental value of 3D transesophageal echocardiography (3DTEE). For each mitral valve intervention, 2D echocardiography, chest x-ray, and fluoroscopy images corresponding to 3DTEE are given...
August 25, 2017: Echocardiography
https://www.readbyqxmd.com/read/28838100/long-term-results-of-the-mitroflow-aortic-pericardial-bioprosthesis-in-over-800-patients-limited-durability-and-mechanisms-of-dysfunction
#6
Fabio Ius, Julia Schulz, Mazen Roumieh, Felix Fleissner, Issam Ismail, Igor Tudorache, Gregor Warnecke, Andreas Martens, Malakh Shrestha, Dietmar Boethig, Axel Haverich, Serghei Cebotari
OBJECTIVES: The Mitroflow aortic pericardial bioprosthesis was widely employed in the past. However, some authors have recently reported early structural valve deterioration (SVD) of the Mitroflow LA/LXA model. Thus, we reviewed our experience with the Mitroflow bioprosthesis and studied the risk factors for SVD and mortality. METHODS: Records of patients who underwent aortic valve replacement with a Mitroflow bioprosthesis between November 2005 and January 2015 were retrospectively evaluated with Kaplan-Meier, Cox-regression and multistate analysis...
August 1, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28826894/usefulness-of-mitral-valve-prosthetic-or-bioprosthetic-time-velocity-index-ratio-to-detect-prosthetic-or-bioprosthetic-mitral-valve-dysfunction
#7
Sushil Allen Luis, Lori A Blauwet, Himabindu Samardhi, Cathy West, Ramila A Mehta, Chris R Luis, Gregory M Scalia, Fletcher A Miller, Darryl J Burstow
This study aimed to investigate the utility of transthoracic echocardiographic (TTE) Doppler-derived parameters in detection of mitral prosthetic dysfunction and to define optimal cut-off values for identification of such dysfunction by valve type. In total, 971 TTE studies (647 mechanical prostheses; 324 bioprostheses) were compared with transesophageal echocardiography for evaluation of mitral prosthesis function. Among all prostheses, mitral valve prosthesis (MVP) ratio (ratio of time velocity integral of MVP to that of left ventricular outflow tract; odds ratio [OR] 10...
July 25, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28820551/fungal-endocarditis-due-to-aspergillus-oryzae-the-first-case-reported-in-the-literature
#8
Andrea Mazza, Nicola Luciani, Marco Luciani, Federico Cammertoni, Alessia Giaquinto, Natalia Pavone, Piergiorgio Bruno, Massimo Massetti
Infective endocarditis (IE) is a severe disease with high mortality and morbidity. Prosthetic valve endocarditis is a life-threatening complication which can occur in less than 10% of patients with valve prosthesis. A fungal etiology of IE is rare and accounts for only 2-4% of all case of endocarditis, but is associated with a higher mortality and morbidity. Herein is reported the first case of fungal endocarditis of aortic valve prosthesis due to Aspergillus oryzae in a 67-year-old caucasian man who nine years previously underwent mitral and aortic valve replacement with mechanical prostheses, and tricuspid annuloplasty for acute IE due to Enterococcus spp...
March 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28818190/aortic-bioprosthetic-valve-durability-incidence-mechanisms-predictors-and-management-of-surgical%C3%A2-and-transcatheter-valve-degeneration
#9
REVIEW
Tania Rodriguez-Gabella, Pierre Voisine, Rishi Puri, Philippe Pibarot, Josep Rodés-Cabau
In recent times, there has been a considerable increase in the use of aortic bioprostheses (vs. mechanical prostheses) for treating aortic valve disease, and this tendency is likely to continue in the near future. However, the occurrence of structural valve degeneration, limiting valve durability, remains an important drawback of surgical and transcatheter bioprostheses. In this paper, we provide an overview of bioprosthetic valve durability, focusing on the definition, incidence, mechanisms, predictive factors, and management of structural degeneration of aortic bioprostheses...
August 22, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28795446/tricuspid-valve-replacement-with-mechanical-prostheses-short-and-long-term-outcomes
#10
Xavier Rossello, Christian Muñoz-Guijosa, Elisabet Mena, Marta Camprecios, Ana B Mendez, Xavier Borras, Josep M Padro
BACKGROUND AND AIM: Tricuspid valve replacement has been associated with high mortality and poor long-term outcomes. We report the preoperative risk factors associated with short and long-term outcomes following tricuspid valve replacement with mechanical prostheses. METHODS: In 62 patients who underwent mechanical tricuspid valve replacement, clinical, laboratory, and echocardiographic findings were analyzed using both univariate and multivariate analyses to describe operative and long-term mortality...
September 2017: Journal of Cardiac Surgery
https://www.readbyqxmd.com/read/28745279/paediatric-nanofibrous-bioprosthetic-heart-valve
#11
REVIEW
Mehrdad Namdari, Babak Negahdari, Ali Eatemadi
The search for an optimal aortic valve implant with durability, calcification resistance, excellent haemodynamic parameters and ability to withstand mechanical loading is yet to be met. Thus, there has been struggled to fabricate bio-prosthetics heart valve using bioengineering. The consequential product must be resilient with suitable mechanical features, biocompatible and possess the capacity to grow. Defective heart valves replacement by surgery is now common, this improves the value and survival of life for a lot of patients...
August 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28706871/tricuspid-valve-regurgitation-after-heart-transplantation
#12
Murray H Kwon, Richard J Shemin
Tricuspid valve regurgitation (TVR) in the orthotopic heart transplant (OHT) recipient is quite common and has varied clinical sequelae. In its severest forms, it can lead to right-sided failure symptoms indistinguishable from that seen in native heart TVR disease. While certain implantation techniques are widely recognized to reduce the risk of TVR in the cardiac allograft, concomitant tricuspid annuloplasty, while having advocates, is not currently accepted as a routinely established adjunct. Decisions to surgically correct TVR in the OHT recipient must be made carefully, as certain clinical scenarios have high risk of failure...
May 2017: Annals of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/28695557/impact-of-new-technologies-and-experience-on-procedural-aspects-of-surgical-aortic-valve-replacement-a-process-analysis
#13
Bettina Langhammer, Maria Nucera, Lars Englberger, Eva Roost, David Reineke, Florian Schönhoff, Henriette Most, Bernhard Winkler, Fabian Gisler, Thierry Carrel, Christoph Huber
BACKGROUND: Surgical aortic valve replacement (SAVR) is the treatment of choice in severe symptomatic aortic valve disease. New techniques and prostheses have been recently developed to facilitate the procedure and reduce aortic cross-clamp time (AOx). The aim of this study was to analyse the different procedural steps in order to identify the most time-consuming part during aortic clamping time and to compare impact of experience on procedural aspects. METHODS: AOx during SAVR was divided into five consecutive steps...
July 11, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28683947/quantitative-prediction-of-paravalvular%C3%A2-leak-in-transcatheter-aortic%C3%A2-valve-replacement-based-on%C3%A2-tissue-mimicking-3d-printing
#14
Zhen Qian, Kan Wang, Shizhen Liu, Xiao Zhou, Vivek Rajagopal, Christopher Meduri, James R Kauten, Yung-Hang Chang, Changsheng Wu, Chuck Zhang, Ben Wang, Mani A Vannan
OBJECTIVES: This study aimed to develop a procedure simulation platform for in vitro transcatheter aortic valve replacement (TAVR) using patient-specific 3-dimensional (3D) printed tissue-mimicking phantoms. We investigated the feasibility of using these 3D printed phantoms to quantitatively predict the occurrence, severity, and location of any degree of post-TAVR paravalvular leaks (PVL). BACKGROUND: We have previously shown that metamaterial 3D printing technique can be used to create patient-specific phantoms that mimic the mechanical properties of biological tissue...
July 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28674619/on-x-versus-st-jude-medical-regent-mechanical-aortic-valve-prostheses-early-haemodynamics
#15
Robert Xu, Mohammad Rahnavardi, Bradley Pitman, Masoumeh Shirazi, Robert Stuklis, James Edwards, Michael Worthington
OBJECTIVE: We aimed to compare the early haemodynamic data of the On-X and St Jude Medical (SJM) Regent bileaflet mechanical prostheses in the aortic position. METHODS: A retrospective study was performed using data collected prospectively for a national database. Thirty-three patients who had aortic On-X valve (On-X group) and 33 matched patients who had aortic SJM Regent valve (SJM group) were included. The intraoperative and early postoperative data were collected...
2017: Open Heart
https://www.readbyqxmd.com/read/28667440/-surgical-treatment-of-aortic-valve-stenosis
#16
O J Liakopoulos, J Merkle, T Wahlers, Y-H Choi
Surgical aortic valve replacement still represents the gold standard in patients with severe symptomatic aortic valve stenosis. In addition to conventional aortic valve replacement by mechanical or biological prostheses via a median sternotomy, novel approaches including minimally invasive strategies and new devices, such as so-called rapid deployment prostheses, are becoming increasingly more established. Autologous replacement strategies including the Ross and the Ozaki procedures have evolved into reliable options at selected centers of excellence...
June 30, 2017: Herz
https://www.readbyqxmd.com/read/28597998/a-novel-mechanical-mitral-valve-replacement-using-sapien-xt
#17
Megan Koehle, Justin A Strote, Mark Guadagnoli, J Bradley Oldemeyer
PATIENT PRESENTATION: We report the case of a 66 year old female who presented to our institution fourteen years after receiving a St. Jude Mechanical Mitral Valve Replacement. She presented in refractory NYHA class IV congestive heart failure with comorbidities of acute renal failure, liver failure, and mental status changes. She was found to have immobility of one of the mitral valve disks with resultant severe mitral stenosis with a mean pressure gradient of 12 mmHg. EVALUATION AND MANAGEMENT: The patient was found to have an STS predicted mortality of 39% with redo surgical MVR, and evaluation by the valve team led to a recommendation of a hybrid surgical and transcatheter procedure...
June 9, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28544834/in-vitro-pulsatile-flow-measurement-in-prosthetic-heart-valves-an-inter-laboratory-comparison
#18
Stephen M Retta, Jeff Kepner, Salvador Marquez, Bruce A Herman, Mark C S Shu, Laurence W Grossman
BACKGROUND AND AIM OF STUDY: One of the first steps in qualifying a new prosthetic valve for eventual clinical use is preclinical flow performance testing in vitro. Such testing is typically performed in an in-vitro test system that simulates the pumping mechanics of the left ventricle of the heart, generally referred to as a pulse duplicator or duplicator. Historically, test results in these systems have varied from duplicator to duplicator. This collaborative effort between heart valve manufacturers and the Food and Drug Administration (FDA) was designed to evaluate the variability of the pulse duplicator test technology for pulsatile flow performance measurement in an interlaboratory round robin...
January 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28498907/complicated-infective-aortic-endocarditis-comparison-of-different-surgical-strategies
#19
Miriam Silaschi, Niki Nicou, Ranjit Deshpande, Sanjay Chaubey, Max Baghai, Rafal Dworakowski, Olaf Wendler
OBJECTIVES: The choice of substitute during aortic valve replacement for infective endocarditis (IE) is still widely debated. We retrospectively reviewed all patients operated for aortic IE and compared groups according to the complexity of IE and substitutes implanted. METHODS: From 2000 to 2015, 187 patients were treated using stentless bioprostheses (SBP) as root replacement (n = 30), mechanical prostheses (MP, n = 45) or stented bioprostheses (SP, n = 112) (mean follow-up 4...
September 1, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28468510/safety-and-efficacy-of-bridging-with-low-molecular-weight-heparin-during-temporary-interruptions-of-warfarin-a-register-based-cohort-study
#20
Vilhelm Sjögren, Bartosz Grzymala-Lubanski, Henrik Renlund, Peter J Svensson, Anders Själander
Low-molecular-weight heparin (LMWH) is often recommended as a bridging therapy during temporary interruptions in warfarin treatment, despite lack of evidence. The aim of this study was to see whether we could find benefit from LMWH bridging. We studied all planned interruptions of warfarin within the Swedish anticoagulation register Auricula during 2006 to 2011. Low-molecular-weight heparin bridging was compared to nonbridging (control) after propensity score matching. Complications were identified in national clinical registers for 30 days following warfarin cessation, and defined as all-cause mortality, bleeding (intracranial, gastrointestinal, or other), or thrombosis (ischemic stroke or systemic embolism, venous thromboembolism, or myocardial infarction) that was fatal or required hospital care...
January 1, 2017: Clinical and Applied Thrombosis/hemostasis
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