Search Results
Results 401 - 450 of 1914
< 4 5 6 7 8 9 10 11 12 13 14 >
Menetti Federico - - 2005
To elucidate compositional changes of the cardiac valves in monkey with aging, the authors investigated age-related changes of elements in the four cardiac valves of rhesus and Japanese monkeys and the relationships among elements by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The four cardiac valves of the aortic, pulmonary, mitral, ...
Lukic Branka - - 2005
Minimization of cavitation is of high importance in the design of pulsatile ventricular assist devices because cavitation can cause blood and valve surface damage. Cavitation is associated with valve closure and has been previously correlated to high dP/dt, high valve closing velocity, and decreased pump filling. In this study, the ...
Mahesh Balakrishnan - - 2005
Prosthetic valve endocarditis is a catastrophic complication of cardiac valve replacement, associated with high mortality rates. Medical treatment is effective in a few instances of endocarditis involving the leaflets alone in bioprostheses. However, accurate diagnosis, better myocardial protection, and improved surgical strategies have led to better survival in patients undergoing ...
Lucey Brendan P - - 2005
A 14-year-old adolescent girl presented with severe congestive heart failure, progressive throughout 3 months. A precordial thrill, machinery-like murmur, and right bundle branch block were noted. Death occurred despite digitalis and diuretic therapy and removal of pleural and ascitic fluid. The autopsy revealed 2 multilocular cystic structures in the interventricular ...
Cianciulli Tomás E - - 2005
BACKGROUND AND AIM OF THE STUDY: Many types of mechanical prostheses are used for heart valve replacement, but it is difficult to distinguish between them using transthoracic echocardiography. Hence, cinefluoroscopy complements the echocardiographic evaluation of cardiac prostheses. The aims of the present study were to: (i) describe the contribution of ...
Singh Steve K - - 2005
Percutaneous catheter-based interventions are an emerging area in the treatment of valvular heart disease. Despite many limitations related to device technology, valve durability and stability, and anatomical obstacles, the early results of percutaneous catheter-based valve repair and replacement are promising. The procedures are currently aimed at high-risk patients who cannot ...
Molad Yair - - 2006
The objective of the study was to evaluate the association between heart valve calcification and atherosclerosis and outcome in systemic lupus erythematosus (SLE). One-hundred and seven patients with SLE (mean age 45.9 +/- 14.7 years) were studied by 2D transthoracic echocardiography. Mitral annulus calcification (MAC) was detected in 24 patients ...
Boudjemline Younes - - 2005
OBJECTIVES: The goal of this study was to develop a device for percutaneous replacement of the tricuspid valve in animals. BACKGROUND: Percutaneous valve replacement has recently been introduced, and early clinical experience has been reported. To date, this technique is limited to the replacement of pulmonary and aortic valves in ...
Murphy Ross T - - 2005
Echocardiography plays an increasingly important role in diagnosis and management of patients with infective and noninfective endocarditis. Significant changes to diagnostic criteria for endocarditis have occurred, and there are evolving trends associated with an older population presenting with endocarditis, greater numbers of patients with prosthetic heart valves and complex congenital ...
Mavroudis Constantine - - 2005
BACKGROUND: The purpose of this study is to analyze atrioventricular valve procedures when performed in association with repeat Fontan operations and to determine the influence of atrioventricular valvar pathology, ventricular function, and arrhythmias on outcome. METHODS: Between December 1994 and August 2004, 80 patients had repeat Fontan operations that included ...
Ben Zekry S - - 2005
BACKGROUND AND AIM OF THE STUDY: Early recognition of subclinical prosthetic valve malfunction may promote early treatment and avoidance of serious complications. Echocardiography cannot be applied on a daily basis; thus, a hand-held device (Thrombocheck) which is capable of detecting subtle changes in the acoustic sounds of prosthetic valve has ...
McDonald J R - - 2005
PURPOSE: To describe clinical features and outcomes of enterococcal left-sided native valve endocarditis and to compare it to endocarditis caused by other pathogens. SUBJECTS AND METHODS: Patients in the International Collaboration on Endocarditis-Merged Database were included if they had left-sided native valve endocarditis. Demographic characteristics, clinical features, and outcomes were ...
Vidyasagar Ramakrishnan - - 2005
BACKGROUND: Acoustic rhinometry (AR) has been used to assess nasal valve obstruction. Standard AR measurement of the cross-sectional area (CSA) of the nasal valve is done in the apneic phase, whereas collapse often occurs on inspiration. We used the ratio of the CSA obtained during active inspiration and during apnea ...
Shiono Motomi - - 2005
BACKGROUND: Between June 1968 and March 1977, Starr-Edwards cloth-covered ball valves were exclusively implanted, in a total of 74 patients at our institution, on a routine basis. METHODS: The retrospective postoperative follow-up rate was 84.5%, for up to 36 years in mitral valve patients (982.5 patient-years); and 81.3%, for up ...
Ozsarac Murat - - 2005
This case report concerns a patient with fracture and primary dysfunction of a prosthetic valve. A 40-year-old man presented to the Emergency Department with a chief complaint of breakthrough pleuritic back pain and shortness of breath. Past surgical history was significant only for an aortic valve replacement and mitral valve ...
Dauphin Claire - - 2005
Fibroblastic endocarditis is a classic complication of prolonged hypereosinophilic syndrome, whatever the cause. In France, it is most frequently encountered in cases of idiopathic hypereosinophilic syndrome. It commonly involves the apex of the ventricles, with a clinical picture of restrictive cardiomyopathy of unfavorable prognosis, and the auriculoventricular valves. We report ...
Corder Elizabeth H - - 2005
Autopsy information on cardiovascular damage was investigated for pathologically confirmed Alzheimer disease (AD) patients (n=84) and non-AD control patients (n=60). The 51 relevant items were entered into a grade-of-membership model to describe vascular damage in AD. Five latent groups were identified "I: early-onset AD," "II: controls, cancer," "III: controls, extensive ...
Rajamannan Nalini M NM Division of Cardiology, Northwestern University, Feinberg School of Medicine, Chicago, Ill, Chicago, IL 60611, USA. - - 2005
Rheumatic heart disease is the most common cause of valvular disease in developing countries. Despite the high prevalence of this disease, the cellular mechanisms are not well known. We hypothesized that rheumatic valve calcification is associated with an osteoblast bone formation and neoangiogenesis. To test this hypothesis, we examined human ...
Jamieson W R E - - 2005
BACKGROUND: Clinical performance of bioprostheses (BP) with presence of atrial fibrillation and/or paced rhythm and mechanical prostheses (MP) in aortic valve replacement was considered a study of importance. METHODS: Aortic valve replacement (AVR) was performed in 163 replacements with porcine bioprostheses (Carpentier-Edwards supra-annular) with atrial fibrillation/paced rhythm identified at latest ...
Tamim Muhammed - - 2005
The aim of this retrospective study was to evaluate the time-related regression of left ventricular hypertrophy after stentless vs. stented aortic valve replacement. From January 1992 to December 2002, 145 patients had a Toronto stentless porcine valve and 106 had a stented Carpentier-Edwards aortic valve replacement. Over a 10-year follow-up, ...
Toumpoulis Ioannis K - - 2005
BACKGROUND: The European System for Cardiac Operative Risk Evaluation (EuroSCORE) is the most rigorously evaluated scoring system in cardiac surgery. We sought to evaluate the performance of EuroSCORE in the prediction of long-term mortality in patients undergoing heart valve surgery. METHODS: Medical records of patients with isolated or combined heart ...
Konagai Naoki - - 2005
The patient was a 61-year-old female. She underwent mitral valve replacement (MVR) with a 27 mm Carbomedics valve and tricuspid valve annuloplasty using the DeVega method in September 1997. She has received anticoagulant therapy by aspirin and warfarin in a nearby hospital. Because of aggravating dyspnea and chest pain after ...
Chu Yin-ping - - 2005
OBJECTIVE: To assess the influence of mimic cardiac rate on hydrodynamics of different mechanical prosthetic cardiac valves. METHODS: US-made CarboMedics bileaflet valve, China-made Jiuling bileaflet valve and C-L tilting disc valve were tested via a pulsatile flow simulator in the aortic position. Testing conditions were set at mimic cardiac rates ...
Kang Chang Hyun - - 2005
BACKGROUND: It has been reported that the CarboMedics mechanical valve has acceptable valve-related complication rates. The aim of this study was to evaluate the long-term performance of the CarboMedics valve. METHODS: Between August 1988 and September 1999, we implanted 1144 CarboMedics valves in 850 patients (aortic, 179; mitral, 385; double-valve, ...
Tamim Muhammed - - 2005
A retrospective assessment of clinical and echocardiographic variables was performed in 145 patients who received a Toronto SPV aortic valve replacement. The majority (90%) of these elderly patients (mean age, 75.5 +/- 7.4 years) were preoperatively in New York Heart Association class III-IV. Operative mortality was 4.8%. Follow-up was complete ...
Jamieson W R E - - 2005
OBJECTIVE: Predominant concerns of patients undergoing valve replacement surgery are risks of death, stroke, antithrombotic bleeding, and reoperation related to the replacement prosthesis. The purpose of this study was to compare valve-related reoperation, morbidity (permanent impairment), and mortality between bioprostheses and mechanical prostheses for mitral valve replacement. METHODS: Between 1982 ...
Penta de Peppo Alfonso - - 2005
BACKGROUND: The impact of a valve prosthesis-patient size mismatch is still controversial. In most studies, the inclusion of a large proportion of poorly active old patients with low cardiac output requirements may be misleading, due to the close correlation between trans-prosthetic gradients and cardiac output. The aim of this study ...
Jai Shankar K - - 2005
Rheumatic involvement of all four heart valves is rare. A 35 year old woman presented with gradually progressive exertional dyspnoea for the preceding 10 years. On evaluation she was in atrial fibrillation with congestive heart failure. Clinical examination found evidence of stenosis of the mitral aortic and tricuspid valves with ...
Barker C L - - 2005
Two infants underwent supra-annular placement of prosthetic mitral valves. The objective of this strategy was to insert a larger valve and delay replacement. This approach was initially successful but by two and three years later the patients developed impairment of cardiac function. The prosthesis decreased the volume and compliance of ...
Boudjemline Younes - - 2005
AIMS: The aim of the present study was to evaluate whether off-pump mini-invasive mitral valve replacement is possible after prior bioprosthetic mitral valve replacement in animals. METHODS AND RESULTS: To validate this concept for off-pump redo mitral valve insertion, we first replaced surgically mitral valves of six sheep under extracorporeal ...
Akinci Esat - - 2005
Erythropoietic protoporphyria (EPP) is an autosomal dominant disorder of heme synthesis, causing excess of protoporphyrin in blood, skin, liver, and other organs. A 58-year-old male patient with EPP underwent aortic valve replacement and a concomitant aortocoronary bypass. The patient has been followed without complications due to EPP postoperatively. Cardiac surgery ...
De Cicco Giuseppe - - 2005
BACKGROUND: One of the most frequent causes of reoperation after heart valve replacement is periprosthetic leakage (PPL). Previous studies have failed to determine whether PPL is linked to specific anatomic details. The aim of this study was to examine the location within the aortic annulus where PPL occurs, and to ...
Milo Simcha - - 2005
BACKGROUND AND AIM OF THE STUDY: Previous in-vitro studies of mechanical heart valves (MHVs) in the closed position demonstrated the formation of regurgitant flows, with bubbles and jets forming vortices during each systole. The study aim was to determine whether the regurgitant flow observed in patients with MHVs can damage ...
Kirsch Matthias E W - - 2005
BACKGROUND AND AIM OF THE STUDY: The Medtronic Mosaic valve (MMV) is a latest generation supra-annular stented porcine valve, which combines a low-profile stent, leaflet fixation at zero pressure in a predilated aortic root, and amino-oleic acid anti-mineralization treatment for improved hemodynamics and durability. A study was conducted to evaluate ...
Dagenais F - - 2005
OBJECTIVE: The diversity of biologic valves available to replace the aortic valve renders selection difficult for the 45- to 65-year-old patient. To evaluate and compare the results of biologic valves in the 45- to 65-year-old patient, we reviewed our experience (1991-2004). METHODS: Three hundred thirty-two patients between 45 and 65 ...
Goodwin Richard L - - 2005
Valvular defects are among the most common and deleterious of all cardiac malformations. The early cardiac cushions are located in the atrioventricular (AV) canal of the embryonic heart. These cushions contain cells that are the primordia of the cardiac valves and membranous septa. Significant progress has been made in delineating ...
Jorge-Herrero E - - 2005
Attempts to replace diseased human valves with prostheses began more than 30 yrs ago. Heart valve prostheses can be broadly classified into mechanical prostheses (made out of non-biological materials) and bioprostheses made out of biological tissue. Biological valves are made from animal tissue bovine pericardium and porcine valves. The use ...
Morsi Yos S - - 2005
Valvular heart disease is an important cause of morbidity and mortality, and currently available substitutes for failing hearts have serious limitations. A new promising alternative that may overcome these shortcomings is provided by the relatively new field of tissue engineering (TE). TE techniques involve the growth of autologous cells on ...
Kern Christine B - - 2005
The process that cardiac cushions undergo to form the mature septa and valves of the adult heart is poorly understood. Periostin is an extracellular molecule that is expressed during cushion mesenchyme formation and throughout valvulogenesis. Once thought to be an osteoblast-specific factor, studies have shown this molecule is antiosteogenic. We ...
Iqbal M B - - 2005
Small vessel vasculitis and endocarditis can both present with multisystem involvement and may present a diagnostic dilemma. Renal and cardiac involvement is common in small vessel vasculitis and rarely small vessel vasculitis may cause heart block. When a patient presents with diffuse symptoms, deteriorating renal function, and heart block, endocarditis ...
Pham Truc Thanh - - 2005
Mesothelial/monocytic incidental cardiac excrescence (MICE) is a benign lesion composed of a haphazard mixture of mesothelial cells, histiocytes, and fibrin, often found incidentally during cardiac valve replacement. Its pathogenesis is controversial with some authors favoring an artifactually produced amalgam while others espoused a reactive phenomenon. Clinically, this entity is important ...
Barrea Catherine - - 2005
OBJECTIVES: We sought to address the role of 3-dimensional echocardiography in the evaluation of the left atrioventricular valve in children with an atrioventricular septal defect who underwent patch augmentation of their valve for either regurgitation or left ventricular outflow tract obstruction. METHODS: Five children whose ages ranged between 4.5 and ...
Okuyama Hiroshi - - 2005
OBJECTIVE: Surgical strategies for patients who have a small aortic annulus associated with a small mitral annulus remain controversial. The objective of this study was to assess the validity of the Manouguian procedure for double valve replacement with patch enlargement of the annuli. METHODS: We reviewed 57 consecutive patients who ...
Otero Eduardo - - 2005
BACKGROUND: The Sorin Slimline aortic valve prosthesis, a modification of the Sorin Bicarbon valve with increased internal orifice diameter and geometric orifice area, may show improved hemodynamic performance when compared with other previous prosthesis, but so far no comparison study has been reported. METHODS: Between May 1999 and March 2002, ...
Krause I - - 2005
BACKGROUND: Heart valves lesions and central nervous system involvement are among the most common manifestations of the antiphospholipid syndrome (APS). OBJECTIVE: To evaluate possible interrelations between these manifestations in a large group of APS patients. METHODS: 284 APS patients were evaluated retrospectively, 159 of whom had primary APS. Cardiac-CNS associations ...
Schoen Frederick J - - 2005
Calcification plays a major role in the failure of bioprosthetic and other tissue heart valve substitutes. Tissue valve calcification is initiated primarily within residual cells that have been devitalized, usually by glutaraldehyde pretreatment. The mechanism involves reaction of calcium-containing extracellular fluid with membrane-associated phosphorus to yield calcium phosphate mineral deposits. ...
Emery Robert W - - 2005
BACKGROUND: From October 1977 to October 2002, 4,480 patients (age range, 17 to 94 years; average, 64 +/- 13 years) underwent single valve replacement with the St. Jude Medical heart valve. Of 2,982 aortic (AVR) and 1,498 mitral valve replacements (MVR), concomitant coronary artery bypass grafting was performed on 42% ...
Misumi Takahiko - - 2005
A 40-year-old woman admitted with heart failure had undergone aortic valve replacement with a Model 2310 Starr-Edwards valve due to aortic regurgitation 33 years previously. She had been followed up for several years, but discontinued follow-up and medication (including Warfarin) for the past 25 years. Echocardiography demonstrated marked dilatation and ...
Manning Keefe B - - 2005
In certain mechanical heart valves, cavitation has been shown to develop during closure and rebound, leading to valve damage, blood damage, and strokes. Whereas it is uncertain what causes mechanical heart valve related strokes, some evidence suggests that stable bubbles may be the culprits. Previous work has indicated that vortex ...
Medart D - - 2005
Design and in vitro performance of a novel bileaflet mechanical heart valve prosthesis are presented. The novel heart valve exhibits three main design characteristics: (i) The leaflets form a Venturi passage in open position. Thus, a beneficial pressure distribution is obtained and the leaflets are stabilised in opened position. (ii) ...
< 4 5 6 7 8 9 10 11 12 13 14 >