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Results 301 - 350 of 1962
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Masuda Kohji K Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan. - - 2007
We have developed an algorithm to find standard cross sections (the long-axis view and the short-axis view) of the heart from successive echograms. We first divided an echogram into small spatial regions and detected the typical motion of the mitral valve by analyzing the brightness variation and correlation coefficient among ...
Butany Jagdish - - 2007
BACKGROUND: Bioprosthetic heart valves are more frequently being used in valve replacement procedures today. Although second-generation bioprosthetic valves have improved functionality over their first-generation counterparts, they still often fail due to primary tissue degeneration. METHODS: This study examines two second-generation porcine valves after surgical explantation, the Hancock-II (HAN; Medtronic Heart ...
Mitchell Michael E - - 2007
Complex forms of atrioventricular (AV) canal (C) such as; AVC with left ventricular outflow tract obstruction, tetralogy of Fallot with complete AVC, double orifice left AV valve, unbalanced complete AVC, and single ventricle patients with common AVC valve require careful preoperative planning and special techniques. This review will explore these ...
Khambadkone Sachin - - 2007
Percutaneous transcatheter intervention for valvular heart disease is the new horizon in transcatheter therapeutics. Balloon dilatation has been used successfully for treatment of congenital and acquired stenotic lesions of semilunar and atrio-ventricular valves. Although attempts have been made to repair and replace cardiac valves without cardiopulmonary bypass and through percutaneous ...
Pavoni Daisy - - 2006
BACKGROUND: The stented Soprano valve (Sorin Biomedica S.pA., Saluggia, Italy) is a pericardial tissue valve designed for a totally supra-annular implant with the aim of improving hemodynamic performance, particularly in patients with a reduced aortic annulus. However, its hemodynamics and early clinical outcome are poorly understood. METHODS: Seventy-seven patients (mean ...
Gallegos Robert P - - 2006
Cardiovascular surgery for the repair or replacement of diseased heart valves has continually improved since its introduction in the early 1960s. Despite advances in prosthetic heart valve design, to date there is no valve that is comparable to the native human valve with respect to durability, risk of thrombosis, and ...
Totsugawa Toshinori - - 2006
Papillary fibroelastoma (PFE) commonly involves the native valve tissue, especially that of the left side of the heart. PFE originates less commonly from the valve of the right side of the heart and rarely from the valve chordae. A 69-year-old man was admitted to our hospital complaining of chest discomfort ...
Schoof Paul H - - 2006
OBJECTIVE: We sought to determine the histologic features of pulmonary autografts explanted after the Ross operation. METHODS: Histologic sections of 30 explanted autografts and 8 normal heart valves were compared and semiquantitatively scored by a blinded cardiovascular pathologist. RESULTS: Pulmonary autografts (n = 30) were explanted on average 6.1 +/- ...
Lau Lawrence - - 2006
BACKGROUND: The fate of bioprostheses (BP) and mechanical prostheses (MP) after valve re-replacement for bioprostheses is not well-documented. This research compares the late fate of these two valve types after valve re-replacement for structural valve deterioration (SVD) of a bioprosthesis. METHODS: Between 1975 and 2000, 298 patients had successful aortic ...
Stassano P - - 2006
BACKGROUND: We studied factors influencing early and late results in patients operated on for aortic valve replacement and coronary artery bypass graft. METHODS: 175 patients were retrospectively analysed over a 10-year period ending in December 2002. There were 135 males and 40 females with a mean age of 62.7 +/- ...
Walther Thomas - - 2007
OBJECTIVE: To evaluate the feasibility of minimally invasive transapical beating heart aortic valve implantation (TAP-AVI) for high-risk patients with aortic stenosis. METHODS: TAP-AVI was performed via a small anterolateral minithoracotomy with or without femoral extracorporeal circulation (ECC) on the beating heart. A pericardial xenograft fixed within a stainless steel, balloon ...
Schlitt Axel - - 2006
BACKGROUND AND AIM OF THE STUDY: The study aim was to investigate the efficacy of three different anticoagulants in preventing thrombus formation on mechanical heart valves, using an in-vitro system. METHODS: Blood samples (470 ml) were taken from young and healthy male volunteers and anticoagulated with unfractionated heparin (UFH; n=18), ...
Wilhelmi Mathias H - - 2006
BACKGROUND AND AIM OF THE STUDY: Homograft valves undergo degenerative changes over time, which finally lead to functional deterioration. Immunological events are believed to play a pivotal role in this process. To further evaluate this hypothesis, the valvular morphology and function, as well as comorbidities predisposing to deteriorative processes, were ...
Karamlou Tara - - 2006
Biventricular correction of tetralogy of Fallot was devised more than 50 years ago. Current short-term outcomes are excellent. The potential for late complications is, however, an important concern for the growing number of postrepair survivors. Progressive pulmonary valve regurgitation leading to right heart failure and arrhythmia are centrally important problems ...
Gallegos Robert P - - 2006
BACKGROUND AND AIM OF THE STUDY: The in-vivo performance of the Triflo trileaflet mechanical valve was evaluated in an ovine model. The aim of long-term follow up was to gather site-specific performance data demonstrating device safety, as required for regulatory approval of this new valve design, prior to its use ...
Akay Tankut Hakki - - 2006
BACKGROUND: We aimed to determine the influence of preoperative, intraoperative, and postoperative variables on short and midterm results in patients undergoing triple-valve surgery. METHODS: Between September 1989 and December 2003, 157 patients underwent triple-valve surgery with mechanical prosthetic valves. Preoperative, operative, and postoperative data were retrospectively analyzed and risk factors ...
Butany Jagdish - - 2006
OBJECTIVE: The St. Jude Medical Silzone (Silzone) mechanical heart valve was voluntarily recalled (January 2000) due to an unusually high incidence of paravalvular leaks. We present the first series of human morphological data on the failure of these valves. METHODS: Nineteen Silzone valves were evaluated from the 176 Silzone valves ...
McVeigh Elliot R - - 2006
Minimally invasive cardiac surgery requires arresting and emptying of the heart, which compromises visualization of the surgical field. In this feasibility study a novel surgical procedure is demonstrated in which real-time MRI is used to guide the placement of a prosthetic aortic valve in the beating heart via direct apical ...
Surdacki Andrzej - - 2007
We hereby report the first--to the best of our knowledge--case of primary lipoma of the aortic valve. The tumor has been diagnosed by echocardiography supported by magnetic resonance imaging in a 63-year-old man with acute inferior ST-elevation myocardial infarction (STEMI) and one-vessel coronary artery disease. Five weeks from the onset ...
Lockowandt Ulf - - 2006
OBJECTIVE: The number of elderly patients who require aortic valve replacement is growing, as is the increase of complicating factors, such as previous coronary bypass grafting and atherosclerotic disease of the ascending aorta. An uncommon surgical option to aortic valve replacement is the apicoaortic valved conduit. In this article the ...
Somers Pamela - - 2006
Calcific aortic valve stenosis is the most common and increasing heart valve disease in the western world. In the last 30 years, diagnosis and management were revolutionized by the development of cardiac catheterisation, echocardiography, cardiac surgery, and medication. Recently, new strategies were introduced for aortic valve replacement using more sophisticated ...
Karim Najibulla - - 2006
The shortage of human donor valves and disadvantages of current mechanical and xenogenic valve grafts cause a growing demand for biologically engineered valves. We developed a bioreactor for in vitro transformation of porcine semilunar heart valves into human valves. The reactor design was optimized in order to achieve a complete ...
Sondermeijer Hugo P - - 2006
We describe the case of a 45-year-old man with mitral and aortic prosthetic valve replacement who presented with symptoms of subacute bacterial endocarditis. Bartonella quintana was grown from blood after prolonged culture. The course of the disease was complicated by splenic infarction, glomerulonephritis resulting in progressive renal insufficiency, and cerebroventricular ...
Tozzi Piergiorgio - - 2007
OBJECTIVE: Off-pump trans left ventricular approach provides more precise deployment of stented aortic valve of any size with respect to the endovascular replacement. One of the key steps of this procedure is the ventricle repair after catheter withdrawing. We designed an animal study to compare the consistency of a sutureless ...
Sachweh Joerg S - - 2006
In children, systemic heart valve replacement with bioprostheses is associated with accelerated valve degeneration, and mechanical prostheses require permanent anticoagulation. Novel "biomechanical" polymeric valve prostheses ("bio" = flexible, "mechanical" = synthetic), solely made of polycarbonate urethane (PCU), were tested in vitro and in a growing animal (calf) model with the ...
Grunkemeier Gary L - - 2006
The current Food and Drug Administration (FDA) heart valve guidance document uses an objective performance criteria (OPC) methodology to evaluate the clinical performance of prosthetic heart valves. OPC are essentially historical controls, but they have turned out to be an adequate, and perhaps optimal, study design in this situation. Heart ...
Jayawardena Suriya - - 2006
We present a case report of a patient who was previously treated for spontaneous epistaxis with a petroleum jelly gauze (0.5 in x 72 in) anterior nasal packing filled with an antibiotic ointment, along with prophylactic oral clindamycin. The patient presented with fever and hypotension 3 days after the nasal ...
Sedrakyan Artyom - - 2006
BACKGROUND: The decision to replace or repair mitral valves is often a difficult decision, and outcomes from the patients' perspective should guide decision-making. We investigated whether the change in health related quality of life (HRQOL) after mitral valve surgery is different after valve repairs compared with replacements. METHODS: We prospectively ...
Butany Jagdish W - - 2006
As the population ages, bioprosthetic heart valves are increasingly being used to replace diseased native valves. Bioprosthetic valve durability depends on patient age and other factors, but rarely exceeds 15 years. Explanted bioprosthetic valves commonly show tissue degeneration, tears, and calcification. Host tissue overgrowth (pannus), to the extent of interfering ...
Jastrzebska M - - 2006
Human aortic, mitral, tricuspid and pulmonary heart valves were investigated by the contact mode atomic force microscopy (AFM) in air, and using FT-IR spectroscopy in the frequency range 950-4000 cm(-1). Heart valves were collected post mortem from 65-78 years old patients who died from non-cardiac diseases. All of the examined ...
Schoen Frederick J - - 2006
This review summarizes several areas relative to the pathology of heart valve disease in which there has been rapid and ongoing evolution, namely, our understanding of: (a) the dynamic functional biology of cardiac valves; and (b) the pathology/pathobiology of valvular heart diseases; (c) new developments in valve repair and substitution ...
Brown John W - - 2006
BACKGROUND: Pulmonary homografts (PH) have been the preferred valved conduits for right ventricular outflow tract (RVOT) reconstruction in the US since the mid-1980s. Although PHs have worked well for Ross patients, many PH extracardiac conduits used for congenital heart surgery suffer from degeneration and develop regurgitation and obstruction within months ...
Sayar Nurten - - 2006
Brucella endocarditis is a zoonosis transmitted by contaminated dairy products. Endocarditis is a rare complication of brucellosis and mainly the aortic valve is infected. We present the case of a female patient with prosthetic mitral valve endocarditis associated with QT prolongation and torsades de pointes. Transesophageal echocardiography revealed vegetation on ...
Baykut Doan - - 2006
BACKGROUND: The ATS Open Pivot Heart Valve was first introduced in 1992 and has been implanted routinely at our institution since 1993. Valve selection was based on surgeon preference. The objective of this study is to retrospectively analyze our 11-year clinical results with ATS prostheses. METHODS: Between January 1993 and ...
Zeng Y J - - 2006
OBJECTIVE: The objectives of this study were to assess the hemodynamic properties of the newly developed artificial heart valve prosthesis experimentally in laboratory simulation, in an animal model, and clinically in a human model and to compare the results measured by catheterization and echocardiography. METHODS: (1) Laboratory simulation. The prosthesis ...
Sezai Akira - - 2006
BACKGROUND: We have used the Starr-Edwards ball (S-E) valve since 1963, the St. Jude Medical (SJM) valve since 1978, and the ATS valve, since 1993 as the first choice of mechanical valve. In this study, the results with each valve during the 40 years were investigated in single mitral valve ...
Jassal Davinder S - - 2006
BACKGROUND: Infective endocarditis is a diagnostic and therapeutic challenge that ultimately requires surgical intervention in 20% of all cases. Early determinants of morbidity and mortality in this high risk population are not well described. METHODS: The aim of this study was to determine preoperative clinical, microbiological, electrocardiographic, and echocardiographic variables ...
Tenedios Felicia - - 2006
Experimental evidence reveals that aPL are not only markers of APS, but also may play a causative role in the development of vascular thrombosis and pregnancy morbidity. The pathogenic mechanisms of aPL seem to be heterogeneous, including endothelial cell activation, the direct inhibition of the activated protein C pathway, abnormalities ...
Flameng Willem - - 2006
BACKGROUND: Previous studies have shown that prosthesis-patient mismatch (PPM) results in higher early and late mortality after bioprosthetic aortic valve replacement. Careful selection of stented bioprostheses was recommended to avoid inadequate effective orifice area. We studied the incidence of PPM and its potential effects on clinical outcome in patients undergoing ...
Erdbrügger Wilhelm - - 2006
We have developed an advanced tissue processing technique on porcine pulmonary heart valves for pulmonary valve replacement and its initial clinical application during the autograft operation according to Ross. The novel concept consists of a cell-free matrix achieved by deoxycholic acid treatment that is repopulated by host cells in vivo. ...
Babaliaros Vasilis - - 2007
Technical developments in valvular intervention culminated in the first percutaneous valve replacement in the pulmonary position (2000) followed by replacement in the aortic position (2002). More recently, with the proven feasibility of percutaneous mitral valve repair, interventional cardiologists and cardiothoracic surgeons have begun to develop a new subspecialty dedicated to ...
Briand Martin - - 2006
BACKGROUND: Several studies have reported similarities between calcification of the native aortic valve and atherosclerosis. Recent studies also suggested that hypercholesterolemia may be a risk factor for calcific degeneration of bioprosthetic valves. The metabolic syndrome (MS) is associated with a higher risk of vascular atherosclerosis. We thus hypothesized that the ...
Cebotari Serghei - - 2006
BACKGROUND: Tissue engineering (TE) of heart valves reseeded with autologous cells has been successfully performed in vitro. Here, we report our first clinical implantation of pulmonary heart valves (PV) engineered with autologous endothelial progenitor cells (EPCs) and the results of 3.5 years of follow-up. METHODS AND RESULTS: Human PV allografts ...
Ali Ayyaz - - 2006
BACKGROUND: It is presumed that stentless aortic bioprostheses are hemodynamically superior to stented bioprostheses. A prospective randomized controlled trial was undertaken to compare stentless versus modern stented valves. METHODS AND RESULTS: Patients with severe aortic valve stenosis (n=161) undergoing aortic valve replacement (AVR) were randomized intraoperatively to receive either the ...
Reinhartz Olaf - - 2006
BACKGROUND: The use of a right ventricle to pulmonary artery (RV-PA) conduit in the Norwood procedure has been proposed to increase postoperative hemodynamic stability. A valve within the conduit should further decrease RV volume load. We report our clinical experience with this modification. METHODS AND RESULTS: From February 2002 through ...
Mol Anita - - 2006
BACKGROUND: Tissue engineering represents a promising approach for the development of living heart valve replacements. In vivo animal studies of tissue-engineered autologous heart valves have focused on pulmonary valve replacements, leaving the challenge to tissue engineer heart valves suitable for systemic application using human cells. METHODS AND RESULTS: Tissue-engineered human ...
Medart Daniel - - 2006
BACKGROUND AND AIM OF THE STUDY: Currently, 95% of all implanted mechanical heart valve prostheses are constructed completely, or at least partially, from pyrolytic carbon. In order to develop a mechanical heart valve prosthesis made from alternative materials, a special hinge design was tested which enabled the integration of wear-resistant ...
Islam M N - - 2006
The morphometry of the intercommissural distances and their relation with other structures of the aortic valve of bovine heart was carried out. A total of 32 apparently healthy bovine hearts of indigenous cattle of both sexes (50% male and 50% female), 2-4 years of age, weighing 500 to 800 gms ...
Dewey Todd M - - 2006
BACKGROUND: Percutaneous aortic valve implantation has recently been performed in nonsurgical patients with severe aortic stenosis. Retrograde valve delivery has been problematic because of the size of the delivery system and concomitant peripheral vascular disease. We investigated a minimally invasive approach through the left ventricular apex for antegrade placement of ...
Linneweber J - - 2006
BACKGROUND AND AIM OF THE STUDY: The 3F equine aortic bioprosthesis is a new stentless valve which is currently undergoing evaluation in a multicenter clinical trial and is considered to have superior hemodynamic performance. Herein is reported the authors' initial experience with the 3F valve, focusing on the hemodynamic performance ...
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