Search Results
Results 351 - 400 of 1943
< 3 4 5 6 7 8 9 10 11 12 13 >
Nyboe Camilla - - 2006
OBJECTIVE: Mechanical heart valves can cause thromboembolic complications, possibly due to abnormal flow patterns that produce turbulence downstream of the valve. The objective of this study was to investigate whether three different bileaflet valve designs would exhibit clinically relevant differences in downstream turbulent stresses. METHODS: Three bileaflet mechanical heart valves ...
Vinh Donald C - - 2006
We report a case of definite Lactococcus garvieae native-valve endocarditis. The diagnosis was suspected in a patient presenting with congestive heart failure and found to have Enterococcus hirae bacteremia, with a history of L. garvieae bacteremia 1 month prior. Diagnosis was confirmed by 16S rRNA gene sequencing of the 2 ...
Babaliaros Vasilis - - 2006
Several advances have been made in interventional cardiology, particularly in the field of valvular heart disease. Among the procedures for which technologies are available, percutaneous replacement of the pulmonary and aortic valves, and percutaneous repair of the mitral valve, via annuloplasty or the Alfieri method, are the best known. Along ...
Toole J Matthew - - 2006
BACKGROUND AND AIM OF THE STUDY: Mechanical valves are used in dialysis patients due to the presumed rapid degeneration of tissue valves. The study aim was to compare the results of mechanical and tissue valves placed in renal dialysis patients. METHODS: Information obtained from a computer-based valve replacement database, telephone ...
Gerosa Gino - - 2006
BACKGROUND: In vivo comparison of the performance of heart valve prostheses is confounded by several factors, such as different nominal size, patients' characteristics and hemodynamics, surgical techniques, and study design. The aim of this study was to compare the in vitro hydrodynamic performances of 5 different tissue valves that would ...
Beholz Sven - - 2006
BACKGROUND AND AIM OF THE STUDY: Stentless aortic valve prostheses usually require two separate suture lines. The Freedom Solo valve (Sorin Group, Saluggia, Italy), by using a minimized implantation technique, requires only a single running suture line of 4-0 polypropylene. Herein are reported the surgical experience and early hemodynamic results ...
García-Bengochea José - - 2006
BACKGROUND AND AIM OF THE STUDY: The study aim was to evaluate the durability of the new Mitroflow 12A pericardial bioprosthesis and to assess ventricular mass regression after aortic valve replacement (AVR) in patients with small valves. METHODS: A total of 326 Mitroflow 12A pericardial bioprostheses was implanted without any ...
Roselli Eric E - - 2006
BACKGROUND AND AIM OF THE STUDY: Modes of failure of the Perimount bioprostheses have not been characterized. Thus, the study aim was to classify their failure modes, to compare their rates of occurrence, and to relate these to patient age. METHODS: Between September 1981 and July 1985, a total of ...
Pannu Harpreet K - - 2006
PURPOSE: To conduct a pilot study to determine the feasibility of evaluating aortic valve morphology and motion on electrocardiogram-gated 64-slice cardiac MDCT. METHODS: Four-dimensional images of the aortic valve were reviewed in 20 consecutive patients who underwent computed tomography (CT) coronary angiography. A consensus reading of 3 readers was performed ...
Attmann Tim - - 2006
BACKGROUND AND PURPOSE: Percutaneous heart valve replacement is an exciting growing field in cardiovascular medicine yet still with some major problems. Only sophisticated improvement of the instruments could make it a real alternative to conventional surgery. Therefore, the aim of this study was to evaluate different delivery devices for percutaneous ...
Tiete A R - - 2006
We report the early and late outcome following left-sided mechanical heart valve replacement in children. Between 10/1981 and 02/2001, 27 children (13 male, mean age 7.2 +/- 5.2 years, range 0.53-15.7 years) underwent mechanical mitral (MVR 16), aortic (AVR 9) or double valve replacement (DVR 2) with St. Jude Medical ...
Lincoln Joy - - 2006
The mature heart valves are dynamic structures composed of highly organized cell lineages and extracellular matrices. The discrete architecture of connective tissue within valve leaflets and supporting structures allows the valve to withstand life-long functional demands and changes in hemodynamic forces and load. The dysregulation of ECM organization is a ...
Walther Thomas - - 2006
OBJECTIVE: Percutaneous aortic valve implantation has been performed in patients with severe aortic stenosis judged as nonsurgical candidates. We evaluated a facilitated transapical antegrade approach for potential use in surgical high-risk patients. METHODS: A pericardial xenograft fixed within a 23-mm stent (Cribier-Edwards aortic prosthesis, Edwards Inc., Irvine, CA, USA) was ...
Rivera-Feliciano José J Department of Genetics, Harvard Medical School, Boston, MA 02115, - - 2006
A hallmark of heart-valve development is the swelling and deposition of extracellular matrix in the heart-valve region. Only myocardium overlying this region can signal to underlying endothelium and cause it to lose cell-cell contacts, delaminate, and invade the extracellular space abutting myocardium and endocardium to form endocardial cushions (EC) in ...
Herbertson Luke H - - 2006
Cavitation is known to cause blood element damage and may introduce gaseous emboli into the cerebral circulation, increasing the patient's risk of stroke. Discovering methods to reduce the intensity of cavitation induced by mechanical heart valves (MHVs) has long been an area of interest. A novel approach for analyzing MHV ...
Josa Miguel - - 2006
BACKGROUND: Normal functioning mechanical heart valve prostheses are designed to have a certain degree of intrinsic structural regurgitation as a washout mechanism to avoid prosthetic thrombosis. However, intrinsic regurgitation leads to blood cell trauma and hemolysis. Information on hemolysis associated with mechanical bileaflet prostheses is scarce. This study evaluated factors ...
Imren Yildirim - - 2006
We report a case involving a surgical sponge retained following an aortic valve replacement. The surgical sponge was placed into the left ventricle to protect calcified debris from falling down into the left ventricular cavity. However, the sponge was forgotten and left inside the patient. We identified the retained surgical ...
Suttie S A - - 2006
AIM: The goal of aortic valve replacement (AVR) surgery in the elderly (= or >75 years) is to extend survival and minimize valve-related morbidity, mortality and reoperation. As the elderly population lives longer, those with implanted valves are at risk of suffering valve related complications. We hypothesize that bioprostheses are ...
Burstow Darryl J - - 2006
A 52-year-old male with idiopathic hypereosinophilic syndrome (HES) was transferred to our institution following the development of acute respiratory failure and shock. He had previously undergone tricuspid valve replacement with bioprosthetic valves on two occasions: the initial surgery for severe native tricuspid valve stenosis and the redo surgery for severe ...
Bhatti F - - 2006
OBJECTIVES: To study the ability of the logistic EuroSCORE to predict operative risk in contemporary cardiac surgery. DESIGN: Retrospective analysis of prospectively collected data. SETTING: All National Health Service centres undertaking adult cardiac surgery in northwest England. PATIENTS: All patients undergoing cardiac surgery between April 2002 and March 2004. MAIN ...
Odim Jonah - - 2006
OBJECTIVE: Since a functional right ventricle is desirable when repairing pulmonary atresia with intact ventricular septum, we sought to determine the factors that portend a successful biventricular repair in these children. METHODS: A review of operative records at UCLA between 1982 and 2001 revealed 56 patients diagnosed with pulmonary atresia ...
Zhai Wanyin - - 2006
Heart valve diseases have a significant high mortality, and the valve replacement using glutaraldehyde crosslinked porcine heart valves is one of the main curing techniques. But its application is limited due to poor durability, calcification of the valves and immunogenic reactions. The aim of this study was to evaluate the ...
Butany Jagdish W - - 2006
Valvular heart disease has numerous etiologies. These range from congenital malformations to infectious and degenerative diseases. Clinically, these result in significant problems, the management of which can necessitate valve replacement with prosthetic heart valves. A rare cause is the deposition of foreign material in the valvular tissues, and these include ...
Elahi Maqsood - - 2006
BACKGROUND: Long-standing aortic stenosis (AS) causes significant progressive left ventricular dysfunction and may result in subendocardial ischaemia and conduction disorders. Though stentless bioprosthesis show better haemodynamic profiles compared with stented, yet debate exists about the differential effects of valve substitutes on the incidence of permanent pacemaker (PPM) implantation following aortic ...
Chan Vincent - - 2006
BACKGROUND: The 1998 American College of Cardiology/American Heart Association Guidelines recommend mechanical prostheses for valve replacement in patients with end-stage renal disease requiring dialysis. The aim of the study is to evaluate the combined experience at two academic centers. METHODS: Sixty-nine valve replacements (aortic 40; mitral 22; multiple 7; 47 ...
Huh Joseph - - 2006
The ideal heart valve substitute would show no deterioration or thrombogenicity, offer no resistance to blood flow, and be easy to implant. However, such a valve does not exist and we must accept compromises in some of these qualities based on our patients' needs. In selection of cardiac valve prosthesis, ...
Otto S - - 2006
The aim of the current study was to find out whether there are sex-dependent differences in the relative number of elastic fibres in human heart valves. Twenty-six aortic valves, 26 mitral valves, 33 pulmonary valves and 28 tricuspid valves of both sexes were obtained at autopsy from newborn to 89-year-old ...
Kreider James W - - 2006
We investigated the flow fields associated with the Bjork-Shiley Monostrut mechanical heart valve in the mitral position of the 50 cc Penn State left ventricular assist device. The valve orientation was adjusted whereby flow field data was collected using planar particle image velocimetry. The mitral valve was rotated from 0 ...
Ye Jian - - 2006
PURPOSE OF REVIEW: The aim of this article is to evaluate the findings of clinical trials in cardiac valve surgery and to determine the real impact in standard of care. Also, publications on randomized clinical trials were reviewed as to integrity and validity. Nineteen randomized clinical trials were identified in ...
Van den Brink Renee B A - - 2006
Transesophageal echocardiography (TEE) is especially suitable for examination of prosthetic valves because of the proximity of the esophagus to the heart and absence of interference with lungs and ribs. This article reviews normal and abnormal morphologic characteristics of prosthetic valves such as spontaneous echocontrast, microbubbles, strands, sutures, vegetations or thrombus. ...
Akbari Jayesh G - - 2006
A 32-year-old female underwent mitral valve replacement with total chordal preservation (Miki's technique) using 26 mm (1M) Starr-Edward prosthesis (SEP) in 1988. The patient was in NYHA class-I until 2001. She progressed to NYHA class-III with paroxysmal nocturnal dyspnoea. Transthoracic echocardiogram showed increased prosthetic valve gradient, and cardiac catheterization confirmed ...
Ballert John A - - 2006
Treatment of nasal obstruction caused by nasal valve dysfunction requires a thorough evaluation of the mechanics of normal nasal anatomy and function. Surgical correction of nasal valve dysfunction is based on determining the epicenter of dysfunction, whether it is a static obstruction of the internal nasal valve or a dynamic ...
Thiem A - - 2006
Percutaneous treatment of valve diseases has proven to be an effective alternative to open surgery since the early 1980's. For most patients with rheumatic mitral stenosis, use of percutaneous catheter-based techniques as balloon valvuloplasty for the treatment of both congenital pulmonary stenosis as well as trans-septal commissurotomy has become a ...
Sato Masataka - - 2006
Significant common atrioventricular valve insufficiency is associated with increased mortality and morbidity in patients with univentricular physiology. Shortly after bidirectional cavopulmonary anastomosis and concomitant valvuloplasty, valve replacement was carried out using a floating annuloplasty technique reinforced by a Dacron strip in a patient with common atrioventricular valve insufficiency. The technique ...
Cianciulli Tomás Francisco - - 2007
Acute prosthetic valve dysfunction due to leaflet escape is a mode of structural valve failure of mechanical prostheses which is associated with a high mortality. In this report, we describe the case of a 32-year-old patient, who underwent mitral valve replacement with a Tri-technologies bileaflet valve three years ago, and ...
Pfeiffer Heidi - - 2006
The case is reported of a 26-year-old male patient who died eight years after the replacement of an aortic valve with a bileaflet mechanical valve (TEKNA; Edwards, USA). Following prosthesis implantation, the patient had been in a good state of health, and his death occurred unexpectedly. Forensic autopsy revealed a ...
Jonsson Olof - - 2006
OBJECTIVES: To analyse the risk of afferent nipple valve stenosis and its consequences and management in patients with a Kock pouch for continent urinary diversion and to study the early results after using an alternative antireflux technique. MATERIAL AND METHODS: Sixty patients consecutively operated on with a conventional Kock reservoir ...
Reinert Dietmar - - 2006
The authors analysed a proportional valve with electrical position feedback for its failure behaviour. Several failures were introduced into the feedback loop, especially into the 2 solenoids and the inductive position transducer. The behaviour of the valve for square and ramp reference signals was recorded and systematically analysed. It was ...
Konagai Naoki - - 2006
Long-term oral anticoagulant therapy is required for recipients of mechanical heart valves. In our hospital, the international normalized ratio of prothrombin time (PT-INR) has been set in the range 1.5-2.5 since October 2001. To evaluate whether coagulant activity is fully suppressed by this target range, coagulant activity was evaluated by ...
Seltzer Sharon M - - 2006
Thrombosis is a well-known and life-threatening complication of prosthetic mechanical valves. Therapy typically requires medical thrombolysis or surgical thrombectomy/valve replacement. We report the case of a thrombosed atrioventricular valve in a young boy with complex congenital heart disease, which was successfully treated with direct intra-atrial infusion of recombinant tissue plasminogen ...
Zimpfer Daniel - - 2006
BACKGROUND: Mechanical aortic valves are a possible source of microemboli potentially causing cerebral injury. Therefore, the long-term impact of mechanical aortic valve replacement on neurocognitive function is uncertain. METHODS: In this prospective, contemporary study, we followed 32 consecutive patients (aged 51 +/- 8 years; range, 38 to 70; EuroSCORE [European ...
Lee Hwansung - - 2006
It is possible that mechanical heart valves mounted in an artificial heart close much faster than those used for clinical valve replacement, resulting in the formation of cavitation bubbles. In this study, the mechanism for mechanical heart cavitation was investigated using the Medtronic Hall monoleaflet valve and the Sorin Bicarbon ...
del Nido Pedro J - - 2006
With the increasing number of late survivors of repair of tetralogy of Fallot, surgical management of patients with right ventricular (RV) dysfunction and limited exercise capacity has become a more frequent problem. The wide variability in clinical status, extent of RV dilatation, and dysfunction at the time of presentation for ...
Bakhtiary Farhad - - 2006
BACKGROUND AND AIM OF THE STUDY: Coronary perfusion is impaired in patients with aortic stenosis (AS). Aortic valve replacement (AVR) leads to improvement, but not complete restoration, of coronary flow. Previous studies have shown that postoperative coronary flow rate and coronary reserve in mechanical valves is dependent on valve design ...
Khambadkone Sachin - - 2006
Percutaneous implantation of valves is a fast evolving field in interventional cardiology. Acquired pulmonary valve disease is uncommon; however, right ventricular outflow tract dysfunction is one of the common indications of reoperations during late follow-up of repaired congenital heart disease. The impact of pulmonary valvular dysfunction on right ventricular function ...
Da Costa M L - - 2006
Homograft or allograft tissue has been available for use as replacement for diseased valves or reconstruction of major vessels for decades. However, with respect to replacement of diseased valvular tissue the search for the ideal valve still continues. In this review we will discuss the clinical indications, surgical techniques, and ...
Hose David Rodney - - 2006
Stresses in a prosthetic heart valve at closure are determined by its geometrical and structural characteristics, by the mechanical support environment, and by the momentum of the valve leaflets or occluder and of the blood at the instant of closure. The mass of blood to be arrested is significantly greater ...
Schaeffer Edward M - - 2006
An antimicrobial is an agent capable of killing or inhibiting the growth of a micro-organism. Antimicrobial prophylaxis encompasses efforts to prevent postprocedure infections through the use of an antimicrobial agent before, and, in some cases, for a limited time after a procedure. A thorough history and physical examination are essential ...
Kiefer M - - 2006
Two different technical principles of gravitational valves (G-valves) have been presented: counterbalancer and switcher G-valves. The objective of our prospective study was to look for clinically relevant differences between both. A total of 54 patients with normal-pressure hydrocephalus (NPH) were treated; 30 patients received an Aesculap-Miethke GA-Valve (GAV; counterbalancer), and ...
Geva Tal - - 2006
Surgical management of tetralogy of Fallot results in anatomic and functional abnormalities in the majority of patients. Although right ventricular volume load due to severe pulmonary regurgitation can be tolerated for years, there is now evidence that the compensatory mechanisms of the right ventricular myocardium ultimately fail and that if ...
< 3 4 5 6 7 8 9 10 11 12 13 >