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Exchangeable valve leaflets

Sadaf F Jafferbhoy, John R Asquith, Ravish Jeeji, Adrian Levine, Madhavan Menon, Arun D Pherwani
Removal of tunnelled central venous catheters can become complex if left in situ for a prolonged period. We report a challenging case of a stuck tunnelled haemodialysis catheter, which required sternotomy with cardio-pulmonary bypass for retrieval. A 47-year-old female had failed attempts to remove the venous limb of a Tessio line on the ward. A cut down on the internal jugular vein and division of the fibrin sheath failed to release it. Synchronous traction was applied via a snare inserted through a femoral approach...
2015: Journal of Surgical Case Reports
Tomislav Mihaljevic, Marijan Koprivanac, Marta Kelava, Avi Goodman, Craig Jarrett, Sarah J Williams, A Marc Gillinov, Gurjyot Bajwa, Stephanie L Mick, Johannes Bonatti, Eugene H Blackstone
IMPORTANCE: The value of robotically assisted surgery for mitral valve disease is questioned because the high cost of care associated with robotic technology may outweigh its clinical benefits. OBJECTIVE: To investigate conditions under which benefits of robotically assisted surgery mitigate high technology costs. DESIGN, SETTING, AND PARTICIPANTS: Clinical cohort study at a large multispecialty academic medical center comparing costs of robotically assisted surgery with 3 contemporaneous conventional surgical approaches for degenerative mitral valve disease...
July 2014: JAMA Surgery
Shangping Wang, Harriëtte Oldenhof, Xiaolei Dai, Axel Haverich, Andres Hilfiker, Michael Harder, Willem F Wolkers
Decellularized tissues can be used as matrix implants. The aims of this study were to investigate protein stability and solvent accessibility in decellularized pulmonary heart valve tissues. Protein denaturation profiles of tissues were studied by differential scanning calorimetry. Protein solvent accessibility of tissue exposed to D2O, and diffusion kinetics of various protective molecules were studied by Fourier transform infrared spectroscopy. Little changes were observed in the protein denaturation temperature during storage, at either 5 or 40°C...
February 2014: Biochimica et Biophysica Acta
Adrian Ebner, Geoffrey K-G Svensson, W Randolph Chitwood, Joseph F Sabik, Lars G Svensson
No abstract text is available yet for this article.
August 2012: Journal of Thoracic and Cardiovascular Surgery
Vincent Pang, Laurent Counillon, Dominique Lagadic-Gossmann, Mallorie Poet, Jérôme Lacroix, Odile Sergent, Raheela Khan, Cyril Rauch
The sodium-proton exchanger 1 (NHE-1) is a membrane transporter that exchanges Na(+) for H(+) ion across the membrane of eukaryotic cells. It is cooperatively activated by intracellular protons, and this allosteric regulation is modulated by the biophysical properties of the plasma membrane and related lipid environment. Consequently, NHE-1 is a mechanosensitive transporter that responds to osmotic pressure, and changes in membrane composition. The purpose of this study was to develop the relationship between membrane surface tension, and the allosteric balance of a mechanosensitive transporter such as NHE-1...
May 2012: Cell Biochemistry and Biophysics
Martin Schweiger, Alexander Stepanenko, Juliane Vierecke, Thorsten Drews, Evgenij Potapov, Roland Hetzer, Thomas Krabatsch
Experience with patients undergoing left ventricular assist device (LVAD) implantation with preexisting mitral valve prostheses is limited. Patients with mechanical heart valves might have an increased risk of thromboembolism; in patients with biologic valves, there might be a risk of structural deterioration of the leaflets. Out of 597 patients supported with a LVAD system between 2000 and 2009, 18 patients had mitral valve surgery prior to implantation. We excluded all patients below 18 years of age, those with postcardiotomy failure, and patients who had had mitral valve reconstruction...
January 2012: Artificial Organs
Bettina F Cuneo, Deborah Fruitman, D Woodrow Benson, Bo-Yee Ngan, Michael R Liske, Marie Wahren-Herlineus, S Yen Ho, Edgar Jaeggi
Atrioventricular (AV) block and endocardial fibroelastosis associated with dilated cardiomyopathy are the most common clinical manifestations of anti-Ro/SSA-mediated fetal cardiac disease. Valvar dysfunction has not been a prominent feature of this disease; however, recent anecdotal cases have suggested an association between rupture of the AV valve tensor apparatus and maternal anti-Ro/SSA antibodies. In the present study, we have described the clinical and laboratory findings and reviewed the published data for infants of anti-Ro/SSA-positive pregnancies with AV valve insufficiency due to chordal rupture from the papillary muscles...
March 1, 2011: American Journal of Cardiology
June-Hong Kim, Ozgur Kocaturk, Cengizhan Ozturk, Anthony Z Faranesh, Merdim Sonmez, Smita Sampath, Christina E Saikus, Ann H Kim, Venkatesh K Raman, J Andrew Derbyshire, William H Schenke, Victor J Wright, Colin Berry, Elliot R McVeigh, Robert J Lederman
OBJECTIVES: We developed and tested a novel transcatheter circumferential annuloplasty technique to reduce mitral regurgitation in porcine ischemic cardiomyopathy. BACKGROUND: Catheter-based annuloplasty for secondary mitral regurgitation exploits the proximity of the coronary sinus to the mitral annulus, but is limited by anatomic variants and coronary artery entrapment. METHODS: The procedure, "cerclage annuloplasty," is guided by magnetic resonance imaging (MRI) roadmaps fused with live X-ray...
August 11, 2009: Journal of the American College of Cardiology
Thomas Breymann, Dietmar Boethig, Reiner Goerg, Wolf-Rüdiger Thies
BACKGROUND: Porcine xenografts for pediatric right ventricular outflow tractus (RVOT) reconstruction lack durability, homografts lack availability. The Contegra is a valve bearing bovine jugular vein. It is tear resistant, well pliable, and permits RVOT reconstruction without further foreign material. The 108 Contegras implanted in Bad Oeynhausen from May 1999 until January 2003 represent the largest single-center Contegra experience. The study gives the preliminary results from a controlled prospective multicenter trial aiming at FDA admission...
September 2004: Journal of Cardiac Surgery
Mads Lomholt, Sten Lyager Nielsen, Søren Berndt Hansen, Niels Trolle Andersen, J Michael Hasenkam
BACKGROUND AND AIM OF THE STUDY: Chordae tendineae may be instrumental for valvular-ventricular interaction, i.e. the reciprocal exchange of force between the left ventricular myocardium and the mitral apparatus. Chordae tendineae are divided into primary leading edge chordae and secondary belly chordae, and differences in thickness and distribution may reflect different functions of the two types. Primary chordae may be fundamental for leading edge control and for correct leaflet coaptation, while secondary chordae may act as the main mediators of valvular-ventricular interaction...
May 2002: Journal of Heart Valve Disease
R A Hill, A Pirouzian, L Liaw
PURPOSE: To understand the pathophysiology of late Ahmed Glaucoma Valve failures and devise strategies to minimize this problem. METHODS: One hundred sixty eyes that had undergone Ahmed Glaucoma Valve implants by one surgeon were retrospectively reviewed. Six eyes with late (greater than 3 months) Ahmed Glaucoma Valve occlusion requiring operative intervention were identified. Two of these eyes underwent initial successful transcameral drainage tube irrigation and four initially required Ahmed Glaucoma Valve exchange...
May 2000: American Journal of Ophthalmology
A Albäck, I Kantonen, L Ihlberg, M Lepäntalo
OBJECTIVES: to compare the result of vein valve disruption with two different valvulotomes during non-reversed saphenous vein bypass. DESIGN: a randomised, blinded clinical study. MATERIALS AND METHODS: twenty patients undergoing femorodistal non-reversed saphenous vein arterial bypass were randomised into two equal groups. Valve leaflet disruption was performed either with a standard size plastic valvulotome or with a metal valvulotome with an exchangeable cutting head...
August 1999: European Journal of Vascular and Endovascular Surgery
K Affeld, L Goubergrits, O Holberndt
Clinical applications of cardiac assist systems continue to have a severe problem, that of thromboembolic complications. The problem originates mainly at the valves, which are usually made of a antithrombogenic material, such as bovine pericardium. However, the valve housing is made of a less suitable material, and wherever the blood flow is stagnant, a thrombus is likely to form. Such stagnant blood flow is found in the space between the housing of the valve and the leaflets, in the sinuses. Consequently, thrombi often are generated in the sinuses...
September 1998: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
P Swier, W J Bos, S F Mohammad, D B Olsen, W J Kolff
During the development of cardiovascular devices, it is necessary to evaluate their performance in vitro under experimental conditions that closely resemble their use in vivo. Therefore, an in vitro test model was developed to evaluate the performance of cardiovascular devices with blood. The in vitro test model consists of a pneumatically driven 50 cc polyurethane ventricle with either mechanical or experimental polyurethane tricuspid semilunar valves, connected to a horseshoe-shaped blood reservoir. A sampling port permits frequent removal of blood for hematologic evaluation...
July 1989: ASAIO Transactions
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