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Results 451 - 500 of 1046
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Messika-Zeitoun David - - 2006
OBJECTIVES: This study was designed to evaluate prevalence, determinants, and clinical outcome implications of reduced functional capacity (FC) in patients with organic mitral regurgitation (MR). BACKGROUND: Evaluation of FC by exercise testing is rarely performed in MR because little is known about the clinical determinants and outcome implications of FC. ...
Notomi Yuichi - - 2006
BACKGROUND: The cascade of events by which early diastolic left ventricular (LV) filling increases with exercise is not fully elucidated. Doppler tissue imaging (DTI) can detect myocardial motion, including torsion, whereas color M-mode Doppler (CMM) can quantify LV intraventricular pressure gradients (IVPGs). METHODS AND RESULTS: Twenty healthy volunteers underwent echocardiographic ...
Frapier Jean-Marc - - 2006
OBJECTIVE: The main goal of this study was to evaluate if the edge-to-edge mitral repair could be a limiting factor for exercise tolerance and to compare these results to those of classical techniques. METHODS: Between 2000 and 2002, 54 consecutive patients were operated on for mitral valve regurgitation (MR). Twenty-five ...
Palmieri Vittorio - - 2006
OBJECTIVE: Clinical relevance of left ventricular (LV) diastolic dysfunction in the absence of congestive heart failure (CHF) and LV systolic dysfunction is not fully established. METHODS: Asymptomatic outpatients, sedentary, with cardiovascular risk factors but no history of cardiovascular events, underwent echocardiographic evaluation of LV structure and function by standard Doppler, ...
Chetboul V - - 2006
Atrial septal defect (ASD) is a common congenital heart disease (CHD) in humans, but considered relatively rare in veterinary medicine. However, modern echocardiographic and Doppler techniques currently offer a good view of the morphology of the interatrial septum, thus facilitating earlier detection of ASD in awake animals. In this context, ...
Bordachar Pierre - - 2006
This prospective echocardiographic study investigated the respective impacts of left ventricular (LV) pacing and simultaneous and sequential biventricular pacing (BVP) on ventricular dyssynchrony during exercise in 23 patients with compensated heart failure and ventricular conduction delays. During exercise, LV pacing and BVP significantly (p <0.05) improved mitral regurgitation and LV ...
Witte K K A - - 2006
To establish the prevalence of preserved left ventricular (LV) systolic function (PSF) in 435 consecutive symptomatic patients referred to a heart failure clinic and to examine their ventilatory response to exercise when compared with 134 control volunteers. 216 (50%) patients had systolic heart failure (SHF) (ejection fraction < 45%). 51 ...
Burgess Malcolm I - - 2006
OBJECTIVES: Our study attempted to validate a Doppler index of diastolic filling (E/E') during exercise with simultaneously measured left ventricular diastolic pressure (LVDP), investigate its association with exercise capacity, and understand which patients to select for testing. BACKGROUND: The ratio of early diastolic transmitral velocity to early diastolic tissue velocity ...
Coln Eric - - 2006
BACKGROUND/PURPOSE: Anatomic and physiological parameters have not been routinely used in the preoperative and postoperative evaluation of pectus excavatum. Most symptomatic patients have had significant subjective improvement after pectus correction. This study is based upon the use of noninvasive upright echocardiography/electrocardiogram (echo/EKG) with exercise to both identify and provide evidence ...
Giardini Alessandro - - 2006
Patients with repaired tetralogy of Fallot (ToF) featuring severe pulmonary regurgitation (PR) and/or right ventricular (RV) dysfunction have reduced exercise tolerance. To assess the impact of PR and of RV function on the ability to recover from exercise in ToF patients. 61 consecutive patients aged 23.1+/-12.1 years underwent maximal cardiopulmonary ...
Ogata Toshiyasu - - 2006
Nonsmoke spontaneous individual contrast (NSSIC) is a phenomenon that is a contrast effect appearing from the right pulmonary vein to the left atrium just after a Valsalva maneuver in a transesophageal echocardiography study without administration of any contrast medium. The goal of this study was to characterize factors associated with ...
Rodrigues Ana Clara Tude - - 2006
The effects of endurance training have been extensively studied in athletes, but longitudinal studies of exercise-induced cardiac changes in normal patients are limited. To assess the effects of 6 months of moderate-intensity aerobic training (1 hour/day, 3 times/week) on normal hearts, 23 sedentary men aged 31.1 +/- 3.5 years were ...
Stickland Michael K - - 2006
Subjects with greater aerobic fitness demonstrate better diastolic compliance at rest, but whether fitness modulates exercise cardiac compliance and cardiac filling pressures remains to be determined. On the basis of maximal oxygen consumption (VO2max), healthy male subjects were categorized into either low (LO: VO2max=43+/-6 ml.kg-1.min-1; n=3) or high (HI: VO2max=60+/-3 ...
Hadano Yasuyuki - - 2006
Left ventricular (LV) diastolic function is 1 of the determinants of exercise tolerance. However, the relation between early diastolic velocity of the mitral annulus (Ea) obtained by tissue Doppler imaging and exercise tolerance is unknown in patients with impaired LV systolic function. To investigate the feasibility of evaluating exercise tolerance ...
Zampoulakis John D - - 2006
OBJECTIVE: To assess by tissue Doppler echocardiography (TDE), the tissue velocities, both at rest and after exercise stress testing, in subjects with mitral valve prolapse (MVP) and those with thick mitral valve (TMV). METHODS: Twenty individuals with typical MVP, 30 with TMV, and 30 healthy controls were enrolled. TDE was ...
Flavell David M - - 2006
The adult heart relies predominantly on fatty acids (FA) for energy generation, and defects in FA catabolism cause dramatic left ventricular (LV) growth in early age. Since lipoprotein lipase (LPL) is the key enzyme in plasma triglyceride catabolism and is highly expressed in the myocardium, we investigated an association between ...
Maryam Esmaeilzadeh
The aim of this study is to evaluate the relation of symptoms to valve stenosis. The hemodynamic data have been evaluated at rest and after exercise using exercise stress echocardiography. We prospectively studied hemodynamic data in 15 consecutive patients with moderate MS who were in NYHA FC two or more. ...
Gerdts Eva - - 2006
The objective of the study was to assess the influence of left ventricular (LV) hypertrophy regression on exercise capacity in hypertensive patients. Doppler echocardiography was performed at rest and during exercise in 51 patients with electrocardiographic LV hypertrophy before and after 1 year of randomized blinded losartan- or atenolol-based antihypertensive ...
Ennezat P-V - - 2006
OBJECTIVES: To assess non-invasively the acute effects of cardiac resynchronisation therapy (CRT) on functional mitral regurgitation (MR) at rest and during dynamic exercise. METHODS: 21 patients with left ventricular (LV) systolic dysfunction and functional MR at rest, treated with CRT, were studied. Each patient performed a symptom-limited maximal exercise with ...
Ennezat Pierre V - - 2006
AIMS: Functional mitral regurgitation (MR) and myocardial asynchronism occur commonly in patients with dilated cardiomyopathy and affect adversely their prognosis and symptoms. The aim of this study was to evaluate the mechanisms of changes in MR severity during dynamic exercise in patients with chronic heart failure (CHF). METHODS AND RESULTS: ...
Iemitsu M - - 2005
Exercise training causes physiological cardiac hypertrophy, which acts to enhance cardiac function during exercise. However, the underlying molecular mechanisms are unclear. We investigated gene expression profile of exercise training-induced cardiac hypertrophy using left ventricle (LV) excised from exercise-trained and sedentary control rats (12-week old). Rats in the training group exercised ...
Kjaergaard Jesper - - 2005
BACKGROUND: Left atrial (LA) enlargement is related to diastolic dysfunction and mitral regurgitation (MR), both of which are common in patients with hypertrophic cardiomyopathy (HCM). This study investigates the association between LA size and exercise capacity in patients with HCM. METHODS: All HCM patients who underwent a treadmill test with ...
Lee Sang Hak - - 2005
Although exercise intolerance is a major symptom of patients with atrial fibrillation (AF), the factors limiting these patients' exercise capacity remains uncertain. This study evaluated the correlation of clinical and echocardiographic parameters with exercise capacity of patients with AF. In all, 73 patients (61 men and 12 women; mean age ...
Stewart K J - - 2006
To determine exercise training effects on cardiac size and left ventricular (LV) diastolic function and relationships of exercise induced changes in physiological and body composition parameters with cardiac parameters. Prospective, randomised controlled trial. Men and women (63.6 (5.7) years, body mass index 29.5 (4.4) kg/m(2)) with untreated hypertension (systolic blood ...
Legaz-Arrese Alejandro - - 2006
Long-term studies on left ventricular (LV) adaptation have not been reported. The echocardiograms of 41 top-class runners (8 males and 6 females sprint-trained, 15 males and 12 females endurance-trained) were recorded at the beginning and after 1, 2, and 3 years of training. A one-way ANOVA and a linear regression ...
Ha Jong-Won - - 2005
BACKGROUND: Although impaired left ventricular (LV) diastolic function is a prominent feature of hypertrophic cardiomyopathy (HCM), diastolic function and its relation to exercise capacity in apical HCM (ApHCM) has not been explored previously. This study was sought to determine the relationship between diastolic mitral annular velocities combined with conventional Doppler ...
Teresińska Anna - - 2005
INTRODUCTION: The perfusion study (which may be obtained using SPECT or GSPECT technology within six hours of administration of the radionuclide Tc-99m-MIBI) reflects the regional blood supply to the left ventricular [LV] myocardium at the time of radionuclide administration (i.e. at rest, at peak exercise, or at peak vasodilatation), while ...
Welsh Robert C - - 2005
Prolonged strenuous exercise has been associated with transient impairment in left ventricular (LV) systolic and diastolic function that has been termed 'cardiac fatigue'. It has been postulated that cardiac beta-adrenoreceptor desensitization may play a central role; however, data are limited. Accordingly, we assessed the cardiovascular response to progressive dobutamine stimulation ...
Meurin Philippe - - 2005
BACKGROUND: Surgical mitral valve (MV) repair is now the best technique to correct mitral regurgitation (MR). However, clinical studies have shown that without exercise training (ET), there is no significant postoperative exercise tolerance improvement. Moreover, healing duration of the MV wound is not well known; thus, the feasibility of an ...
Geneves C - - 2005
Introduction:Abdominal aortic aneurysm rupture is 95% lethal. Numerical simulation of Navier-Stokes equations allows seeing complex flow phenomenon in laminar state. Method:In this study, we work on a model using the finite element method with an actual 3D geometry. This geometry is from a point cloud obtained by a tomodensitometry scan ...
Skaluba Stanislaw J - - 2005
BACKGROUND: Isolated diastolic dysfunction is thought to account for approximately 50% of cases of heart failure. We tested the hypotheses that (1) the use of different methods for assessing systolic and diastolic function may contribute to the apparent frequency with which they are dissociated and (2) that combined assessment of ...
Lancellotti Patrizio - - 2005
BACKGROUND: In patients with asymptomatic valvular aortic stenosis, exercise testing may help to stratify the clinical risk. However, data are limited, and the role of quantitative exercise Doppler echocardiography has never been investigated. METHODS AND RESULTS: Sixty-nine consecutive patients with severe asymptomatic aortic stenosis (aortic valve area <1 cm2) who ...
Giga Vojislav - - 2005
AIMS: The aim of this study was to assess the relationship between exercise-induced changes in mitral regurgitation (MR) and echocardiographic characteristics of mitral deformation, global left ventricular (LV) function and shape at rest and after exercise. METHODS AND RESULTS: Forty consecutive patients with ischaemic MR due to prior myocardial infarction ...
Venckūnas Tomas - - 2005
We report that anaerobic thresholds of distance runners are related mostly to training volume and not to left ventricular (LV) morphofunction. Significant correlation between LV diastolic function at rest and anaerobic thresholds was not detected. However, we found an inverse correlation between LV mass (wall thickness too) and resting as ...
Schmidtke C - - 2005
Repair of diseased bicuspid aortic valves has gained increasing interest as an alternative to conventional valve replacement. Hemodynamic data at exercise have not been reported before. The aim of this study was to investigate the clinical and echocardiographic status of patients after bicuspid aortic valve repair at rest and exercise. ...
Yumoto Yasuo - - 2005
OBJECTIVES: The objectives of this study are firstly to clarify how the Doppler isovolumetric contraction time (ICT) is influenced by arterial oxygen pressure (PaO2) or pH, and secondly to confirm the relationship between the Doppler ICT and myocardial contractility during hypoxemia and/or acidemia in the fetal lamb. MATERIAL AND METHODS: ...
Moyssakis I - - 2005
PURPOSE: There are studies indicating more pronounced left atrial (LA) systolic dysfunction at rest in idiopathic (IDDC) than in ischaemic-dilated cardiomyopathy (ISDC). It was hypothesized that the findings would be similar with regards LA systolic reserve. METHODS: Twenty-six patients with IDDC, 28 with ISDC and 25 normal controls underwent low-dose ...
Isobe Satoshi - - 2005
Little is known about the relation between left ventricular (LV) functional reserve in response to exercise and cardiac sympathetic nervous function in patients with nonobstructive hypertrophic cardiomyopathy (HCM). We investigated whether an assessment of cardiac sympathetic nervous function by myocardial (123)I-metaiodobenzylguanidine ((123)I-MIBG) scintigraphy might provide a sign of an abnormal ...
Carson Rachel C - - 2005
BACKGROUND: Problematic or dysfunctional hemodialysis (HD) catheters are routinely reversed to achieve adequate blood flow for dialysis delivery. The purpose of the study is to determine the effect of varying blood pump speed (Qb) on access recirculation (AR), and urea clearance (K) in dysfunctional catheters in the normal and reversed ...
Legaz Arrese Alejandro - - 2005
We evaluated the echocardiograms of 134 male and 54 female elite runners who competed over different distances to observe cardiac enlargement and differences among athletes engaged in different types of training, and to relate the echographic dimension with running performance. In male runners, left ventricular (LV) internal diameter at end ...
Eichinger Walter B - - 2005
OBJECTIVE: This prospective randomized study compares a porcine with a bovine bioprosthesis in the aortic position with regard to hemodynamic performance during exercise. METHODS: Between August of 2000 and December of 2002, 136 patients underwent aortic valve replacement with the porcine Medtronic Mosaic (n = 66) or the bovine Carpentier-Edwards ...
Chamoun Antonio J - - 2005
BACKGROUND AND OBJECTIVE: Color M-mode flow propagation velocity (Vp) was shown to be a preload-independent measure of diastolic function. To study the effects of an increase in afterload induced by isometric handgrip exercise on diastolic function assessment in patients with cardiomyopathy, we measured Vp and conventional Doppler indices at baseline ...
Patrianakos Alexandros P - - 2005
INTRODUCTION: This study assessed the effects of Nebivolol on left ventricular (LV) function and exercise capacity in patients with non-ischaemic dilated cardiomyopathy (NIDC). METHODS: After enrolment in this double-blind trial, 60 patients, aged 55 +/- 9.5 years, with angiographically proven NIDC, LV ejection fraction (EF) < 45%, NYHA class II-III, ...
Lancellotti Patrizio - - 2005
AIMS: In patients with heart failure and chronic ischaemic mitral regurgitation (MR), the mortality risk is related to the quantified severity of MR at rest and its dynamic changes during exercise. The impact of dynamic MR on long-term mortality, hospital admission for heart failure, and major adverse cardiac events has ...
Elkington Andrew G - - 2005
PURPOSE: To determine how injection rate, cardiac function, and breathhold influence the arterial input function (AIF), in order to optimize the AIF in the clinical setting for quantitative myocardial perfusion cardiovascular magnetic resonance (CMR). MATERIALS AND METHODS: Gd (0.1 mmol/kg) bolus was injected at 3, 5, or 7 mL/second in ...
Sachdev Vandana - - 2005
BACKGROUND: The left atrium is afterload sensitive, responding to immediate changes in left ventricular (LV) diastolic pressure, and left atrial volumetric remodeling has been reported in conditions associated with abnormal diastolic function. We examined the relationship between left atrial volumetric remodeling and objective measures of exercise capacity in patients with ...
Reade Clifton C - - 2005
PURPOSE: Robotic mitral valve repair increases precision however operative times are longer. Prior studies have indicated that robotic knot tying is time consuming and it is without potential room for improvement. We therefore investigated tissue approximation devices that may shorten operative times. DESCRIPTION: A 67-year-old female was approached through a ...
Ashikaga Hiroshi - - 2005
Diastolic dysfunction in volume-overload hypertrophy by aortocaval fistula is characterized by increased passive stiffness of the left ventricle (LV). We hypothesized that changes in passive properties are associated with abnormal myolaminar sheet mechanics during diastolic filling. We determined three-dimensional finite deformation of myofiber and myolaminar sheets in the LV free ...
Naylor Louise H - - 2005
Chronic exercise induces physiological enlargement of the left ventricle ('athlete's heart'), but the effects of current and long-term exercise training on diastolic function have not been investigated. Echocardiography and Doppler imaging were used to assess left ventricular (LV) dimensions and indices of diastolic filling in 22 elite athletes at the ...
Freimark Dov - - 2005
This study examined left ventricular (LV) filling properties and exercise hemodynamics noninvasively before and after an exercise training program in patients with chronic heart failure (HF). Although exercise training did not improve LV filling properties in patients with advanced HF, LV filling properties determined the hemodynamic benefit attainable from exercise ...
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