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Results 401 - 450 of 1945
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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 ...
Levi Daniel S - - 2005
Stent-based transcatheter valves continue to require large sheaths inappropriate for deployment in children. Low-profile covered stent valves (CSVs) were constructed by removing triangular sections from two sides of partially expanded Palmaz P308 stents before covering the stents with 0.1 mm polytetrafluoroethylene. Valves were carefully crimped onto balloon catheters and deployed ...
Golden Kish L - - 2005
Gender disparities in cardiac function have been described. Yet the extent to which gender related differences in cardiac performance are due to the presence of sex-specific biological factors are unclear. We used a longitudinal study aimed at examining whether castration and androgen replacement affects cardiac performance in conscious adult male ...
Pibarot P - - 2006
Prosthesis-patient mismatch (PPM) is present when the effective orifice area of the inserted prosthetic valve is too small in relation to body size. Its main haemodynamic consequence is to generate higher than expected gradients through normally functioning prosthetic valves. This review updates the present knowledge about the impact of PPM ...
Vesely Ivan - - 2005
Tissue-engineered heart valves have been proposed by physicians and scientists alike to be the ultimate solution for treating valvular heart disease. Rather than replacing a diseased or defective native valve with a mechanical or animal tissue-derived artificial valve, a tissue-engineered valve would be a living organ, able to respond to ...
Altinbas Ahmet - - 2005
Prosthetic valve thrombosis is a rare and dreaded complication of patients with mechanical valves, particularly those in the mitral position. A 45-year-old female with status post prosthetic mitral valve replacement was admitted to the hospital with acute pulmonary edema. Echocardiography showed mitral valve thrombosis which was treated with tissue plasminogen ...
Guenzinger Ralf - - 2005
BACKGROUND: The aim of the study was to evaluate rest and exercise performance and left ventricular mass regression of the Medtronic Advantage (Medtronic, Inc, Minneapolis, MN) prosthesis in the aortic position at 1 year at a single center as part of a multicenter, prospective clinical trial. METHODS: Between May 2002 ...
Ismailov Rovshan M - - 2005
CONTEXT: Cardiac injury has been well recognised as a complication of blunt chest trauma. Its clinical spectrum ranges from blunt cardiac injury (BCI) to complete rupture of cardiac tissues, with cardiac valvular injury often being overlooked. OBJECTIVE: To determine whether hospitalised BCI is associated with increased risk of cardiac valve ...
Chambers J - - 2005
OBJECTIVE: This study compared hemodynamic function and clinical events in consecutive patients randomly assigned to receive a wholly supra-annular replacement valve or a valve with an intra-annular component. METHODS: Fifty-two patients with an average age of 62 years (range 40-74 years) were sized for both a CarboMedics Top Hat valve ...
Reiss N - - 2005
As the number of patients with congenital heart defects requiring heart valve replacement increases, the need for durable valve substitutes with good hemodynamic performance and a low incidence of complications becomes more apparent. The use of porcine xenografts is burdened with early fibrocalcific degeneration, whereas the use of mechanical heart ...
Vaughan Paul - - 2005
BACKGROUND AND AIM OF THE STUDY: In 1998, the American College of Cardiology and The American Heart Association (ACC/AHA) published guidelines for the postoperative anticoagulation of patients who have undergone heart valve replacement. The American College of Chest Physicians made similar recommendations in 2001. The present survey was conducted to ...
Puvimanasinghe John P A - - 2005
BACKGROUND: The second-generation Carpentier-Edwards pericardial valve (Edwards Lifesciences LLC, Irvine, CA) is widely used for aortic valve replacement. However, knowledge on the long-term outcomes of patients after valve implantation is incomplete. We used microsimulation to calculate the long-term outcome of any given patient after aortic valve replacement with the Carpentier-Edwards ...
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, ...
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