Search Results
Results 351 - 400 of 1925
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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 ...
Williams Mervyn A - - 2006
BACKGROUND AND AIM OF THE STUDY: The study aim was to evaluate the clinical performance of the On-X heart valve in a socioeconomically disadvantaged population. Most patients were from an indigenous, poorly educated and geographically dispersed segment of the population where anticoagulation therapy was generally erratic. METHODS: Between 1999 and ...
Jassal Davinder S - - 2006
Although the role of echocardiography is well established in the management of native valve and prosthetic valve endocarditis, the recent introduction of intracardiac devices, including pacemakers, implantable defibrillators, closure devices, and ventricular assist devices, has expanded its utility. Echocardiography permits the direct imaging of valvular vegetations, and it allows for ...
Stock Ulrich A - - 2006
Due to human valve (allograft) scarcity, the concept of decellularization of xenogeneic valves is currently pursued. The two current concepts of guided tissue regeneration and tissue engineering are critically discussed. While guided tissue regeneration shows promising results in animal experiments, there is no scientific evidence that the obtained results might ...
Kandemir Ozer - - 2006
We designed this study to compare long-term results of St. Jude Medical and CarboMedics mechanical heart valves in the aortic position. We retrospectively analyzed the results of 174 consecutive patients who received either a St. Jude (n=80) or a CarboMedics (n=94) mechanical aortic valve from March 1992 through October 2004. ...
Sacks Michael S - - 2006
The vast majority of prosthetic valve designs are either mechanical prosthesis and bioprosthetic heart valves (BHV). Mechanical prostheses are fabricated from synthetic materials, mainly pyrolytic carbon leaflets mounted in a titanium frame. Tissue engineering (TE) offers the potential to create cardiac replacement structures containing living cells, which has the potential ...
Escobedo C C Innovamédica S.A. de C.V., Mexico City, - - 2006
Manufacturing process of medical grade silicon rubber trileaflet valves for VADs could propitiate important leaflet thickness variations which could result in partial opening of the valve and affect its hydrodynamic performance. The leaflets of a total of 10 valves were measured to assess its thickness variability. Two experiments were performed ...
Herrmann Howard C - - 2005
Recent innovations have occurred in the treatment of valvular heart disease so that we now stand at the very beginning of a field that is likely to show considerable growth in the future. These innovations include the introduction of self-expanding and balloon-expandable stents containing bioprosthetic heart valves, and other valvular ...
Ohki Shin-ichi - - 2005
OBJECTIVE: Recently, there has been an increase in case of repeated open-heart valve surgery and the clinical results of the second surgery are only slightly worse than those of the first surgery. However, clinical results of the third open-heart valve surgery at the same position are rarely reported. Clinical features ...
Mangano Francesco T - - 2005
OBJECT: The use of adjustable differential pressure valves has been recommended to improve ventriculoperitoneal (VP) shunt performance in selected patients; however, published data are scarce regarding their clinical reliability. Recently, the identification of a number of malfunctioning programmable valves during shunt revision surgery in children prompted a retrospective review of ...
Muratori Manuela - - 2006
Transthoracic (TTE) and transesophageal echocardiography (TEE) are the standard techniques for the evaluation of prosthetic valve function. However, quantitative evaluation of leaflet(s) motion is not routinally carried out, although leaflet(s) opening and closing angle measurements are important information to recognize prosthetic dysfunction. For this purpose, cinefluoroscopy is considered the "gold ...
Tordoir J H M - - 2006
The world's haemodialysis population is growing rapidly so that in 2006, some 1.5 million interventions will be needed for access placement, revision and maintainance. Secondary and tertiary arteriovenous fistulas are becoming an integral part of vascular access especially in the elderly, comorbid population. Venous conduits may have a more favourable ...
Englberger Lars - - 2005
OBJECTIVE: To examine risk factors for major paravalvular leak (PVL) events after mechanical heart valve replacement. METHODS: We analyzed outcome of 807 patients randomized into the Artificial Valve Endocarditis Reduction Trial (AVERT). The mean follow-up time was 30.6 months and 21 major PVL events were reported. Three additional major PVL ...
Pomerantz Benjamin J - - 2005
BACKGROUND AND AIM: Left ventricular (LV) 3D systolic strain decreases in absolute value postoperatively and does not recover in patients who undergo aortic valve replacement (AVR) for chronic aortic insufficiency (AI). We investigated whether choice of valve prosthesis (mechanical [St. Jude], bioprosthetic [bovine pericardial], Ross procedure) had a significant impact ...
Ngaage Dumbor L - - 2005
BACKGROUND: Cardiac papillary fibroelastoma is a rare benign tumor that can cause thromboembolism. We have found no large surgical series describing its treatment and outcome. METHODS: A retrospective review of all patients treated surgically for this tumor from 1985 to 2002. RESULTS: There were 88 patients with a mean age ...
Botha Cornelius A - - 2005
Prosthetic heart valves have been outpaced by progress in cardiac surgery. Early biologic valve prostheses consisted of tissues mounted on a rigid stent, and did not require anticoagulation, but rarely survived two decades. Subsequently, durable mechanical valve prostheses dominated despite, the requisite anticoagulation. The mechanical design remains imperfect, with obstruction ...
Karaca Mustafa - - 2005
BACKGROUND: Coronary sinus (CS) catheterization is often used in cardiac resynchronization therapy. Failure to enter the CS is the most common reason for LV pacing lead implant failure. METHODS: We evaluated the anatomic barriers, Thebesian and Vieussens valves, the CS and its tributaries in 52 adult human cadaver hearts. RESULTS: ...
Ito-Akabori Shie - - 2005
Four cases of double-orifice left atrioventricular (AV) valve are reported. Three of the four patients with double-orifice left AV valve had other associated congenital heart diseases, and the fourth had double-orifice left AV valve alone. A patient with associated ventricular septal defect, who presented with pulmonary congestion and hypertension, suffered ...
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