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mechanical valve prostheses

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https://www.readbyqxmd.com/read/29148548/acrylate-based-materials-for-heart-valve-scaffold-engineering
#1
Rosaria Santoro, Seshasailam Venkateswaran, Francesco Amadeo, Rong Zhang, Maura Brioschi, Anthony Callanan, Marco Agrifoglio, Cristina Banfi, Mark Bradley, Maurizio Pesce
Calcific aortic valve disease (CAVD) is the most frequent cardiac valve pathology. Its standard treatment consists of surgical replacement either with mechanical (metal made) or biological (animal tissue made) valve prostheses, both of which have glaring deficiencies. In the search for novel materials to manufacture artificial valve tissue, we have conducted a high-throughput screening with subsequent up-scaling to identify non-degradable polymer substrates that promote valve interstitial cells (VICs) adherence/growth and, at the same time, prevent their evolution toward a pro-calcific phenotype...
November 17, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/29135480/mechanical-surface-area-of-prosthetic-heart-valve-adverse-clinical-impact-of-large-mechanical-valve-in-mitral-position
#2
Yang Hyun Cho, Kiick Sung, Wook Sung Kim, Jae-Hun Kim, Sung Mok Kim, Pyo Won Park
Although thromboembolic accidents are serious adverse events associated with mechanical mitral valves, there have been no studies on the clinical impact of the large mechanical surface areas (MSAs) of mechanical mitral prostheses. Between 1995 and 2010, 488 consecutive adult patients underwent isolated mechanical mitral valve replacement. We measured the MSA via three-dimensional computed tomography for each prosthesis. Mean patient age was 50.6 ± 11.1 years. The mean body surface area (BSA) and MSA index (MSAI, MSA/BSA) were 1...
November 8, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29134537/current-status-of-cardiovascular-surgery-in-japan-2013-and-2014-a-report-based-on-the-japan-cardiovascular-surgery-database-4-valvular-heart-surgery
#3
Kiyoharu Nakano, Norimichi Hirahara, Noboru Motomura, Hiroaki Miyata, Shinichi Takamoto
Data from the Japan cardiovascular surgery database from 2013 to 2014 were analyzed to demonstrate the mortality rate and choice of surgical procedures, especially concerning the selection of valve prosthesis for each valve position and patient age group, and the effects of preoperative complications on mortality and prosthetic valve selection. The proportion of each surgical procedure was compared for each patient age in the aortic, mitral, and tricuspid positions. The proportion of mechanical valve prostheses was 23...
November 13, 2017: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29117490/mechanical-or-biologic-prostheses-for-aortic-valve-and-mitral-valve-replacement
#4
Andrew B Goldstone, Peter Chiu, Michael Baiocchi, Bharathi Lingala, William L Patrick, Michael P Fischbein, Y Joseph Woo
BACKGROUND: In patients undergoing aortic-valve or mitral-valve replacement, either a mechanical or biologic prosthesis is used. Biologic prostheses have been increasingly favored despite limited evidence supporting this practice. METHODS: We compared long-term mortality and rates of reoperation, stroke, and bleeding between inverse-probability-weighted cohorts of patients who underwent primary aortic-valve replacement or mitral-valve replacement with a mechanical or biologic prosthesis in California in the period from 1996 through 2013...
November 9, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/29092120/immunologic-responses-in-biological-and-mechanical-valve-prostheses-inflammation-and-functionality-are-not-always-related
#5
Alejandra Rodriguez-Hernandez, Maria Elena Soto, Jesus Vargas-Barron, Ricardo Marquez, Rafael Bojalil-Parra, Israel Perez-Torres, Jose Luis Salas-Pacheco, Valentin Jimenez-Rojas, Jose Antonio Arias-Godinez, Veronica Guarner-Lans
BACKGROUND: The aim of this retrospective study was to evaluate the inflammatory response in patients with aortic and/or mitral prostheses, and to correlate the level of inflammatory markers with prosthesis functionality. METHODS: A total of 48 patients with biological or mechanical prostheses was included in the study, in which levels of tumor necrosis factor-alpha (TNFα), interleukin (IL)-1, -4, and -6, interferon-gamma (IFNγ), osteopontin (OPN), intercellular adhesion molecule (ICAM), vascular cell adhesion molecule (VCAM), endothelin-1 and C-reactive protein were analyzed...
May 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/29045279/leaflet-kinematics-of-mechanical-and-bioprosthetic-aortic-valve-prostheses
#6
Bernhard Vennemann, Thomas Rösgen, Paul Philipp Heinisch, Dominik Obrist
The hemodynamic performance of artificial aortic valves (AVs) and the probability for structural valve deterioration can be linked to the valve kinematics. Comparability among different studies is limited because of variations in the experimental setups and physiologic boundary conditions. This study presents results of kinematic measurements of bioprosthetic and mechanical AVs that were tested in an identical experimental setting such that they can be directly compared with each other. The kinematics of AVs is typically presented in the form of the geometric orifice area and its temporal evolution...
October 18, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28994867/mid-terme-results-of-cardiac-surgery-of-valve-replacement-by-mechanical-prosthesis-about-861-patients
#7
Djafer Boulanouar
BACKGROUND: Patients with mechanical valvular prostheses are becoming more numerous in our country. Their medical care poses a number of problems in a particular socio-economic context of our geographical regions. AIM: The purpose of this study was to identify the complications of this heart valve replacement surgery by mechanical prostheses and try to compare our results with those of literature. METHODS: From January 1998 to June 2003, 861 patients were operated for acquired valvular heart disease (413 men and 448 women), average age 39±11 years...
November 2016: La Tunisie Médicale
https://www.readbyqxmd.com/read/28982562/prosthetic-mitral-surgical-valve-in-transcatheter-aortic-valve-replacement%C3%A2-recipients-a-multicenter-analysis
#8
Ignacio J Amat-Santos, Carlos Cortés, Luis Nombela Franco, Antonio J Muñoz-García, Jose Suárez De Lezo, Enrique Gutiérrez-Ibañes, Vicenç Serra, Mariano Larman, Raúl Moreno, Jose M De La Torre Hernandez, Rishi Puri, Pilar Jimenez-Quevedo, José M Hernández García, Juan H Alonso-Briales, Bruno García, Dae-Hyun Lee, Paol Rojas, Teresa Sevilla, Renier Goncalves, Silvio Vera, Itziar Gómez, Josep Rodés-Cabau, José A San Román
OBJECTIVES: The aim of this study was to determine the prognosis and specific complications of patients with prosthetic mitral valves (PMVs) undergoing transcatheter aortic valve replacement (TAVR). BACKGROUND: TAVR is performed relatively often in patients with PMVs, but specific risks are not well described. METHODS: A multicenter analysis was conducted, including patients with severe symptomatic aortic stenosis who underwent TAVR at 10 centers...
October 9, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28966103/a-whole-heart-motion-correction-algorithm-effects-on-ct-image-quality-and-diagnostic-accuracy-of-mechanical-valve-prosthesis-abnormalities
#9
Young Joo Suh, Young Jin Kim, Jin Young Kim, Suyon Chang, Dong Jin Im, Yoo Jin Hong, Byoung Wook Choi
BACKGROUND: We aimed to determine the effect of a whole-heart motion-correction algorithm (new-generation snapshot freeze, NG SSF) on the image quality of cardiac computed tomography (CT) images in patients with mechanical valve prostheses compared to standard images without motion correction and to compare the diagnostic accuracy of NG SSF and standard CT image sets for the detection of prosthetic valve abnormalities. METHODS: A total of 20 patients with 32 mechanical valves who underwent wide-coverage detector cardiac CT with single-heartbeat acquisition were included...
September 21, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28914661/percutaneous-aortic-leak-closure-in-a-small-and-frail-annulus-after-double-heart-valve-replacement
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
MULTICENTER STUDY
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...
October 15, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28820551/fungal-endocarditis-due-to-aspergillus-oryzae-the-first-case-reported-in-the-literature
#17
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
#18
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
#19
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
#20
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
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