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Valve durability

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https://www.readbyqxmd.com/read/28430883/ten-year-results-of-aortic-valve-replacement-with-first-generation-mitroflow-bioprosthesis-is-early-degeneration-a-structural-or-a-technical-issue
#1
Liesbeth Lootens, Jonas Verbeke, Thomas Martens, Tine Philipsen, Frank Caes, Yves Van Belleghem, Guido Van Nooten, Katrien François, Dirk De Bacquer, Thierry Bove
OBJECTIVES: Concerns have been raised about the durability of the first-generation Mitroflow aortic bioprosthesis (model 12 A-LX) due to the lack of anticalcification treatment. This study reflects a 10-year experience with this prosthesis for aortic valve replacement. METHODS: From June 2003 to May 2012, the Mitroflow prosthesis was used for aortic valve replacement in 510 patients, of whom only 467 with complete clinical follow-up were included for analysis. Study end-points were survival and incidence of structural valve degeneration (SVD)...
April 19, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28429161/on-the-in-vivo-function-of-the-mitral-heart-valve-leaflet-insights-into-tissue-interstitial-cell-biomechanical-coupling
#2
Chung-Hao Lee, Will Zhang, Kristen Feaver, Robert C Gorman, Joseph H Gorman, Michael S Sacks
There continues to be a critical need for developing data-informed computational modeling techniques that enable systematic evaluations of mitral valve (MV) function. This is important for a better understanding of MV organ-level biomechanical performance, in vivo functional tissue stresses, and the biosynthetic responses of MV interstitial cells (MVICs) in the normal, pathophysiological, and surgically repaired states. In the present study, we utilized extant ovine MV population-averaged 3D fiducial marker data to quantify the MV anterior leaflet (MVAL) deformations in various kinematic states...
April 20, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28427320/the-role-of-inelastic-deformations-in-the-mechanical-response-of-endovascular-shape-memory-alloy-devices
#3
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/28410640/florida-sleeve-procedure-is-durable-and-improves-aortic-valve-function-in-marfan-syndrome-patients
#4
Seyed Hossein Aalaei-Andabili, Tomas Martin, Philip Hess, Charles Klodell, Ashkan Karimi, George Arnaoutakis, Teng Lee, Thomas Beaver
BACKGROUND: The Florida sleeve (FS) procedure was developed as a simplified approach for repair of functional type I aortic insufficiency secondary to aortic root aneurysm. We evaluated postoperative aortic valve function, long-term survival, and freedom from reoperation in Marfan syndrome patients who underwent the FS procedure at our center. METHODS: All Marfan syndrome patients undergoing FS procedure from May 2002 to December 2014 were included. Echocardiography assessment included left ventricular end-diastolic diameter (LVEDD), left ventricular end-systolic diameter (LVESD), ejection fraction, and degree of aortic insufficiency (none = 0, minimal = 1, mild = 2, moderate = 3, severe = 4)...
April 12, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28410636/stent-and-leaflet-stresses-in-29-mm-second-generation-balloon-expandable-transcatheter-aortic-valve
#5
Yue Xuan, Kapil Krishnan, Jian Ye, Danny Dvir, Julius M Guccione, Liang Ge, Elaine E Tseng
BACKGROUND: Equipoise of transcatheter aortic valve replacement with surgical aortic valve replacement in intermediate-risk patients has been demonstrated. As transcatheter aortic valve replacement usage expands, questions regarding long-term durability become paramount. Valve design impacts durability with regions of increased leaflet stress being vulnerable to early failure. However, transcatheter aortic valve (TAV) leaflet stresses are unknown. The objective of this study was to determine stent and leaflet stresses of second-generation balloon-expandable TAV...
April 12, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28398887/reconstructive-surgery-of-the-aortic-valve
#6
Mohammad Bashar Izzat
Reconstructive surgery of the aortic valve is a safe alternative to aortic valve replacement in many patients with aortic regurgitation, with satisfactory durability and an overall and cardiovascular survival advantage. It is also associated with higher rates of freedom from valve-related and anticoagulation-related events.
April 2, 2017: British Journal of Hospital Medicine
https://www.readbyqxmd.com/read/28395636/ttk-chitra-tilting-disc-heart-valve-model-tc2-an-assessment-of-fatigue-life-and-durability
#7
N N Subhash, Adathala Rajeev, Sreedharan Sujesh, C V Muraleedharan
Average age group of heart valve replacement in India and most of the Third World countries is below 30 years. Hence, the valve for such patients need to be designed to have a service life of 50 years or more which corresponds to 2000 million cycles of operation. The purpose of this study was to assess the structural performance of the TTK Chitra tilting disc heart valve model TC2 and thereby address its durability. The TC2 model tilting disc heart valves were assessed to evaluate the risks connected with potential structural failure modes...
April 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28369578/sutureless-aortic-bioprosthesis
#8
José Martínez-Comendador, Mario Castaño, Javier Gualis, Elio Martín, Pasquale Maiorano, Javier Otero
Aortic valve replacement (AVR) is the treatment of choice for aortic valve disease, with excellent results reported in the short- and long-term follow-up. Due to the increasing number of patient comorbidities and older age, various technical alternatives have been developed such as transcatheter aortic valve implantation and, more recently, sutureless valve bioprostheses. For patients with very high surgical risk, transcatheter implantation is becoming the top therapeutic option. However, the percutaneous technique still has major disadvantages including those related to implantation without excision of the diseased native valve without direct view of the annulus, which increases the probability of developing perivalvular leaks and a high percentage of atrioventricular block...
March 21, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28369386/robotic-mitral-valve-repair-a-european-single-centre-experience
#9
Emiliano Navarra, Stefano Mastrobuoni, Laurent De Kerchove, David Glineur, Christine Watremez, Michel Van Dyck, Gebrine El Khoury, Philippe Noirhomme
OBJECTIVES: We report the outcomes of robotic valve repair for degenerative mitral regurgitation (MR) in our Institution. METHODS: Between February 2012 and July 2016, 134 patients underwent robotic mitral valve (MV) repair with the da Vinci Si system. All the operations were performed through a mini-thoracotomy in the fourth right intercostal space, cardiopulmonary bypass and mild hypothermia. The clinical and echocardiographic follow-up was 100% complete. RESULTS: There was no hospital death...
March 20, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28332088/simple-technique-of-repair-for-barlow-syndrome-with-posterior-resection-and-chordal-transfer-via-minimally-invasive-approach-primary-experience-in-a-consecutive-series-of-22-patients
#10
H Kamiya, Payam Akhyari, J-P Minol, A C Ites, T Weinreich, S Sixt, P Rellecke, U Boeken, A Albert, A Lichtenberg
OBJECTIVE: Current techniques for mitral valve repair (MVR) in Barlow's disease require high level of surgical expertise due to a complex anatomy. A novel and simple standardized technique that particularly considers the pathological changes of the mitral valve in Barlow's disease has been developed. METHODS: Between 2009 and 2013, 22 patients underwent minimally invasive MVR for Barlow's disease and severe mitral regurgitation (MR). A simple, standardized technique was applied, including resection of P2 segment of posterior mitral leaflet (PML) with preservation of the shortest chordae, transfer of the preserved chordae to A2, and implantation of a semi-rigid open ring...
March 22, 2017: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28329451/preliminary-experience-with-the-use-of-an-extracellular-matrix-to-augment-the-native-pulmonary-valve-during-repair-of-tetralogy-of-fallot
#11
Anil Dharmapuram, Nagarajan Ramadoss, Sudeep Verma, Vejendla Gouthami, Ivatury Rao
BACKGROUND: During repair of tetralogy of Fallot (TOF), when a transannular patch is needed in case of a small annulus and dysplastic pulmonary valve, we chose to reconstruct the right ventricular outflow tract by augmenting the divided anterior leaflet with an extracellular matrix (ECM) patch to produce a competent valve. In this study, we present our preliminary experience and early outcomes. METHODS: From March 2013 to December 2015, of the 206 patients who underwent primary repair of TOF, 52 required a transannular incision...
March 2017: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/28329156/medtronic-duran-ancore-versus-edwards-mc3-rings-for-tricuspid-annuloplasty
#12
Seok In Lee, Ho Jin Kim, Joon Bum Kim, Sung-Ho Jung, Suk Jung Choo, Cheol Hyun Chung, Jae Won Lee
OBJECTIVES: Ring annuloplasty is now regarded as the standard surgical technique for the correction of tricuspid regurgitation (TR). However, comparative research on the durability of commercially available annuloplasty rings is limited. We reviewed early and late surgical results of tricuspid annuloplasty using the Duran AnCore and Edwards MC3 rings. METHODS: From our institutional prospective cardiac surgical database, we identified 581 adult patients (55.9 ± 12...
February 17, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28329138/small-intestinal-submucosa-tricuspid-valve-tube-graft-shows-growth-potential-remodelling-and-physiological-valve-function-in-a-porcine-model%C3%A2
#13
Diana M Ropcke, Christine Ilkjaer, Marcell J Tjornild, Soren N Skov, Steffen Ringgaard, Vibeke E Hjortdal, Sten L Nielsen
OBJECTIVES: Tricuspid valve reconstruction using small intestinal submucosal extracellular matrix (ECM) designed as a tube graft is possible in severe valve pathology. Using cardiac magnetic resonance imaging (MRI) and digital photograph imaging, valves were evaluated after 6 months in a porcine model. METHODS: Ten 60 kg pigs received a tricuspid valve tube graft. A baseline MRI was performed after 2 weeks ( n  = 8). A follow-up MRI was performed in three of five 6 months' survivors to assess function and haemodynamics of the tricuspid tube graft...
February 27, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28324874/strategies-and-outcomes-of-repeat-mitral-valve-interventions-after-failed-mitraclip-therapy
#14
Carmelo Grasso, Sergio Buccheri, Davide Capodanno, Antonio Popolo Rubbio, Maria Elena Di Salvo, Salvatore Scandura, Sarah Mangiafico, Tatiana Salerno, Stefano Cannata, Veronica Dezio, Giuseppe Castania, Marco Barbanti, Piera Capranzano, Corrado Tamburino
Percutaneous mitral valve repair (PMVR) with the MitraClip system (Abbott Vascular, Santa Clara, CA, USA) is a valid therapeutic option for patients with severe mitral regurgitation (MR) deemed to be at high or prohibitive surgical risk. Despite the reassuring data on efficacy and long-term durability of the procedure, the proportion of patients with residual or relapsing severe MR after MitraClip therapy is not negligible. In light of the detrimental prognostic impact of severe MR, repeat interventions are increasingly performed in clinical practice using different techniques...
March 22, 2017: Cardiology
https://www.readbyqxmd.com/read/28296655/endoscopic-fundoplication-effectiveness-for-controlling-symptoms-of-gastroesophageal-reflux-disease
#15
Michael I Ebright, Praveen Sridhar, Virginia R Litle, Chaitan K Narsule, Benedict D Daly, Hiran C Fernando
OBJECTIVE: Transoral incisionless fundoplication (TIF) is a completely endoscopic approach to treat gastroesophageal reflux disease (GERD). We previously reported our initial results demonstrating safety and early effectiveness. We now present an updated experience describing outcomes with longer follow-up. METHODS: For a three-year period, TIF procedures were performed on 80 patients. Preoperative workup routinely consisted of contrast esophagram and manometry...
March 14, 2017: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
https://www.readbyqxmd.com/read/28290174/when-not-to-go-solo-contraindications-based-on-implant-experience
#16
Laurens W Wollersheim, Wilson W Li, Abdullah Kaya, Wim J van Boven, Jan van der Meulen, Bas A de Mol
BACKGROUND: Because of the design and specific implantation technique of the stentless Freedom SOLO bioprosthesis, patient selection is crucial. The aim of the study was to discuss the contraindications to this prosthesis based on the authors' implant experience. METHODS: Between April 2005 and February 2015, one surgeon at the authors' center performed 292 aortic valve replacements using a bioprosthesis, with the initial intention of implanting a SOLO valve in every patient...
November 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28290166/long-term-outcome-of-the-sorin-freedom-solo-stentless-aortic-valve
#17
Torsten Christ, Benjamin Claus, Christina Zielinski, Volkmar Falk, Herko Grubitzsch
BACKGROUND: The Sorin Freedom SOLO valve is a third-generation stentless aortic valve which shows beneficial hemodynamic performance compared to stented bioprostheses. Long-term results regarding hemodynamics, the durability of the valve, and patient outcome are scarce, and their acquisition was the aim of this single-center study. METHODS: Between 2005 and 2006, a total of 68 consecutive patients (30 males, 38 females; mean age at surgery 76.1 ± 6.3 years) underwent aortic valve replacement with a Sorin Freedom SOLO prosthesis...
November 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28276717/rv-to-pa-conduits-impact-of-transcatheter-pulmonary-valve-replacement-in-adults-a-national-register-study
#18
Kristofer Skoglund, Gunnar Svensson, Ulf Thilén, Mikael Dellborg, Peter Eriksson
OBJECTIVE: The use of a conduit is an established surgical method for reconstruction of the right ventricular outflow tract in congenital heart disease; however, its limited durability makes reintervention almost inevitable. We studied the trends in new implantation, reoperation, and transcatheter pulmonary valve replacement (TPVR) from a Swedish national perspective. DESIGN AND RESULTS: The Swedish registry of congenital heart disease (SWEDCON) was used to collect data...
February 15, 2017: Scandinavian Cardiovascular Journal: SCJ
https://www.readbyqxmd.com/read/28273682/determinants-of-recurrent-tricuspid-regurgitation-following-tricuspid-valve-annuloplasty-during-mitral-valve-surgery
#19
Hisato Ito, Toru Mizumoto, Yasuhiro Sawada, Kazuya Fujinaga, Hironori Tempaku, Hideto Shimpo
BACKGROUND: The purpose of this study was to determine risk predictors for recurrent tricuspid regurgitation (TR) following tricuspid valve annuloplasty during mitral valve surgery. METHODS: Ninety-eight consecutive patients underwent tricuspid valve annuloplasty concomitant with mitral valve repair (71 patients), replacement (16 patients), or other procedures over a 10-year period. Fifty-seven patients underwent surgery with a flexible band and 41 with a rigid ring...
April 2017: Journal of Cardiac Surgery
https://www.readbyqxmd.com/read/28262292/combined-aortic-root-replacement-and-mitral-valve-surgery-the-quest-to-preserve-both-valves
#20
Hoda Javadikasgari, Eric E Roselli, Muhammad Aftab, Rakesh M Suri, Milind Y Desai, Mitra Khosravi, Frank Cikach, Monica Isabella, Jay J Idrees, Sajjad Raza, Bassman Tappuni, Brian P Griffin, Lars G Svensson, A Marc Gillinov
OBJECTIVES: Coexisting aortic root and mitral valve pathology is increasingly recognized among patients undergoing surgery. We characterized the pathology and surgical outcomes of patients with combined aortic root and mitral disease. METHODS: From 1987 to 2016, 118 patients (age 52.40 ± 17.71 years) underwent concomitant aortic root and mitral procedures (excluding aortic stenosis, endocarditis, and reoperations). Aortic root pathologies included degenerative aneurysm (94%) and aortic dissection (6%)...
May 2017: Journal of Thoracic and Cardiovascular Surgery
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