Search Results
Results 551 - 600 of 1046
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Baldi James C - - 2003
Aging is associated with impaired early diastolic filling; however, the effect of endurance training on resting diastolic function in older subjects is unclear. Heart rate and ventricular loading conditions affect mitral inflow velocities measured by Doppler echocardiography; therefore, tissue Doppler imaging of mitral annular velocity, which is relatively preload independent, ...
Giannuzzi Pantaleo - - 2003
BACKGROUND: The effects of exercise training (ET) on left ventricular (LV) remodeling in chronic heart failure are not definitively established, and the safety of ET in these patients is still debated. METHODS AND RESULTS: This multicenter study investigated the long-term effect of moderate ET on LV remodeling, work capacity, and ...
Kim Hyung-Kwan - - 2003
BACKGROUND: Determinants of exercise capacity have not been clearly defined in hypertensive patients. Doppler tissue imaging (DTI), a recently developed echocardiographic modality, is useful for evaluating left ventricular (LV) function regardless of loading conditions. The present study was performed to identify the determinants of exercise capacity in hypertensive patients using ...
Das Paul - - 2003
AIMS: Valve compliance might determine the onset of symptoms better than resting measures of aortic stenosis. This study compared valve compliance measured by dobutamine stress echocardiography with resting haemodynamic variables against the end-point of symptoms at low workload during exercise testing. METHODS AND RESULTS: Echocardiography was performed at rest and ...
Haluska Brian A - - 2003
BACKGROUND: Latent left ventricular (LV) dysfunction in patients with valvular or myocardial disease may be identified by loss of contractile reserve (CR) at exercise echocardiography. Contraction in the LV longitudinal axis may be more sensitive than radial contraction to minor disturbances of LV function. We sought to determine whether tissue ...
Tischler Marc - - 2003
This study examines the use of a novel 2-dimensional echocardiographic technique to measure left ventricular (LV) systolic torsion or twist in normal human hearts during maximal exercise. The effects of dynamic exercise on LV twist have not previously been determined. LV twist was measured in 25 healthy human control patients ...
Tessitore Nicola - - 2003
Balloon angioplasty (PTA) is an established treatment modality for stenosis in dysfunctional arteriovenous fistulae (AVF), although most studies showing efficacy have been retrospective, uncontrolled, and nonrandomized. In addition, it is unknown whether correction of stenosis not associated with significant hemodynamic, functional, and clinical abnormality may improve survival in AVF. This ...
Sung J - - 2003
An exaggerated SBP response to exercise has been associated with increased left ventricular (LV) mass in some but not all studies. A total of 43 women and 34 men, aged 55-75 years, without evidence of cardiovascular disease, with a mean resting BP of 142+/-9/77+/-8 mmHg had their BP measured at ...
Komine Hidehiko - - 2003
To examine whether the central characteristics of the aortic baroreflex alter from moment to moment during static exercise, we identified the dynamic changes in the sizes of the bradycardia and depressor response evoked by stimulation of the aortic depressor nerve (ADN). Three conscious cats were trained to voluntarily extend the ...
Rolla Giovanni - - 2003
BACKGROUND: Pulmonary hypertension (PH) is an important limiting factor of exercise tolerance in patients with mitral stenosis (MS). We wished to investigate the relationship between respiratory nitric oxide (NO), a potent vasodilator, and exercise tolerance in patients with moderate MS. In the same patients, we wondered whether acute change in ...
Warburton Darren E R - - 2003
The objectives of this study were to evaluate the prevalence of late potentials (LP) in female triathletes before and after prolonged strenuous exercise (PSE), and to determine whether LP are related to greater left ventricular (LV) dimensions and/or mass. Thirteen female triathletes were examined immediately before (Pre), one hour after ...
Kim Hyun Joong - - 2003
BACKGROUND: We evaluated the efficacy of the cardiopulmonary exercise test as an objective indicator of functional status and as a pre-operative prognostic indicator in patients with mitral regurgitation (MR) and aortic regurgitation (AR). METHODS: Cardiopulmonary exercise tests and echocardiography were performed in 47 patients (MR: 30, AR: 15, MR + ...
Isobe Naoki - - 2003
Sudden cardiac death is a well-documented complication of hypertrophic cardiomyopathy and additionally, failure to raise blood pressure (BP) during exercise has been associated with a poor outcome. The present study group comprised 58 patients with hypertrophic non-obstructive cardiomyopathy (HNCM) who were receiving beta-blocker therapy. All patients underwent submaximal exercise radionuclide ...
Otsuka Yoritaka - - 2003
BACKGROUND: The purpose of this study was to determine whether or not patients with moderate to severe left ventricular (LV) dysfunction benefit from exercise training starting early after acute myocardial infarction (AMI) without deteriorating LV remodeling. METHODS: We investigated changes in exercise capacity and LV end-diastolic dimension (LVDd by two-dimensional ...
Figueroa-Casas Juan B - - 2003
Although FEV1 improvement is routinely used to define bronchodilator (BD) response, it correlates poorly with clinical effects. Changes in lung volumes (LV) have shown better correlation with exercise tolerance and might be more sensitive to detect BD effects. We assessed the additional contribution of measuring LV before and after BD ...
D'Andrea Antonello - - 2002
AIM: The aim of the study was to evaluate in 263 competitive athletes possible correlations between changes induced by different sport activities in left ventricular (LV) structure and cardiac response during maximal physical effort. METHODS: A total of 160 top-level endurance athletes (ATE; swimmers, runners; 28+/-4 years; 98 male) and ...
Thompson Paul D - - 2002
Valvular heart disease in physically active patients can present a diagnostic challenge, because adaptations to exercise may mimic abnormalities. Electrocardiograms may be used to follow asymptomatic or mildly symptomatic athletes but are not very useful for those with valve disorders. Moderate-to-severe aortic insufficiency requires careful follow-up and periodic echocardiograms to ...
Rerkpattanapipat Pairoj - - 2002
Aortic stiffness increases with advancing age and is associated with the age-related decline in exercise capacity in healthy persons. Previous studies have suggested that aortic compliance is reduced in heart failure (HF). Older persons with systolic HF can have particularly severe exercise intolerance. However, the relation between increased aortic stiffness ...
Peterson Linda R - - 2003
One of the most debilitating effects of primary aging is the decline in aerobic exercise capacity. One of its causes is an age-related decline in peak exercise stroke volume. This study's main purpose was to determine the cardiovascular adaptations to aging that most influence peak exercise stroke volume in the ...
Paul A K - - 2002
Prolonged impairment of left ventricular (LV) systolic function following exercise induced ischaemia has been well demonstrated. The objective of this study was to examine the effect of exercise induced ischaemia on the post-stress LV diastolic function in patients with coronary artery disease (CAD). Seventy-four subjects with known or suspected CAD ...
Lapu-Bula Rigobert - - 2002
BACKGROUND: Functional mitral regurgitation (MR) is common in patients with heart failure and left ventricular (LV) dysfunction, and its severity may vary over time, depending primarily on the loading conditions. Because dynamic changes in the severity of functional MR may affect forward stroke volume, we hypothesized that exercise-induced changes in ...
Humphries Matthew C - - 2002
PURPOSE: 1) To determine the relations of left ventricular (LV) structure and function to total body composition, visceral adipose tissue (VAT), and hemodynamics in obese children; 2) to determine the effects of 4-month of physical training (PT) on LV structure and function and hemodynamics; and 3) to explore determinants of ...
Coffi Stephen B - - 2002
To improve the assessment of the hemodynamic significance of borderline iliac stenoses (stenosis with a peak systolic velocity [PSV] ratio between 1.5 and 3.5) by means of hyperemic duplex scanning. The duplex ultrasound parameter-absolute increase in PSV across the stenosis after exercise (Delta PSV(e))-was studied prospectively. Fifty-eight legs in 53 ...
Young L E - - 2002
Maximum oxygen uptake also appears to correlate to athletic performance in horses. In the Thoroughbred industry, there has long been an empirical theory that heart size is related to athletic performance, despite a lack of scientific evidence supporting this assertion. To investigate the relationship between peak oxygen consumption (VO2max) and ...
Zoncu Sandra - - 2002
We studied the relationship between left ventricular (LV) function and the increased LV mass in 18 highly trained rowing athletes (14 men, 4 women; mean age 20.7 +/- 4.5 years) using pulsed wave Doppler tissue imaging (PWDTI). Thirteen untrained volunteers, matched for age and body mass index, acted as control ...
Li Wei - - 2002
OBJECTIVES: To assess the effect of atrial flutter (AFL) on exercise tolerance in patients with grown-up congenital heart (GUCH), exercise tests with modified Bruce protocol were performed in 20 patients aged 21 to 62 years with GUCH (11 females, 9 males) during symptomatic AFL and again 24 to 48 hours ...
Gerdts Eva - - 2002
OBJECTIVE: To assess whether Doppler evidence of impaired early diastolic relaxation during exercise is associated with lesser exercise capacity in hypertensive patients. DESIGN: Single center addition to the echocardiographic substudy in the Losartan Intervention For Endpoint (LIFE) reduction in hypertension study. SETTING: University hospital out-patient clinic. METHODS: A total of ...
McCully Robert B - - 2002
OBJECTIVES: We sought to define the prognostic implications of the extent and severity of exercise echocardiographic abnormalities in patients with good exercise capacity. BACKGROUND; The exercise capacity of patients with known or suspected coronary artery disease (CAD) is of prognostic importance, as is the extent of exercise-related left ventricular (LV) ...
Kadir Isaac - - 2002
OBJECTIVE: Doppler echocardiographic evaluation of prosthetic heart valve function is usually performed at rest although this situation is not representative of patients' daily activities. Following aortic valve replacement, patients most likely to remain symptomatic are those with a small aortic root and dobutamine or exercise echocardiography has been proposed to ...
Eren Mehmet - - 2002
BACKGROUND AND AIMS OF THE STUDY: In order to provide patients with better exercise capacity, interventional therapy to the mitral valve is often carried out in mitral stenosis (MS). Hence, it is crucial to determine exercise capacity before deciding on the time of intervention. The study aim was to demonstrate ...
Peteiro Jesús - - 2002
Diagnosis of coronary artery disease (CAD) by exercise echocardiography is usually based on rest or exercise-induced regional wall-motion abnormalities. Mitral regurgitation (MR), left ventricular (LV) global systolic function, and LV inflow measurements can be assessed during exercise echocardiography; however, their diagnostic value has not been analyzed consistently. Treadmill exercise echocardiography ...
Colin Patrice - - 2002
Left ventricular (LV) relaxation is crucial for LV function, especially during exercise. We compared the effects of increasing doses of ivabradine, a selective inward hyperpolarization-activated current inhibitor, and atenolol on the rate and extent of LV relaxation (best fit method: time constant tau(BF), pressure asymptote P(BF)) at rest and during ...
Haykowsky Mark J - - 2002
Resistance training (RT) is a popular method of conditioning to enhance sport performance as well as an effective form of exercise to attenuate the age-mediated decline in muscle strength and mass. Although the benefits of RT on skeletal muscle morphology and function are well established, its effect on left ventricular ...
Hung M J - - 2002
Fifteen elderly patients with normal left ventricular (LV) systolic function and New York Heart Association functional class II-III were studied. The effect of verapamil on LV diastolic function was assessed by congestive heart failure (CHF) score, treadmill exercise test, and Doppler echocardiography at baseline, and after each three-month treatment period ...
Plicchi G - - 2002
AIMS: The aims of this study were first, to demonstrate that Peak Endocardial Acceleration during isovolumic systole (PEA I) is related to positive peak LVdP/dt, while Peak Endocardial Acceleration during isovolumic relaxation time (PEA II) is related to aortic diastolic pressure (ADP) and to negative peak LVdP/dt; and second, to ...
Lebrun F - - 2001
OBJECTIVES: We sought to examine the feasibility and reliability of quantifying mitral regurgitation (MR) during exercise by Doppler echocardiography in patients with heart failure and to assess the relationship between dynamic MR and systolic pulmonary artery pressure changes. BACKGROUND: The severity of MR can be quantified by using several echocardiographic ...
Ansalone G - - 2001
BACKGROUND: In patients with heart failure, biventricular pacing (BIV) improves left ventricular (LV) performance by counteracting LV unsynchronized contraction caused by the presence of left bundle branch block (LBBB). However, no data are yet available on regional long-axis function in patients with LBBB or on BIV effectiveness in improving such ...
Kashem A - - 2001
We hypothesized that a two-stage vascular delay procedure followed by 5 weeks of conditioning of the latissimus dorsi muscle (LDM) could benefit the heart during the training period and greatly increase cardiac assistance when examined with maximum potential. In mongrel dogs (n = 10), left ventricle (LV) dysfunction was induced ...
Amato M C - - 2001
OBJECTIVE: To determine the prognostic value of exercise testing, valve area, and maximum transaortic pressure gradient in asymptomatic patients with aortic valve stenosis. SETTING: The outpatient service of a tertiary referral centre for cardiology. DESIGN: Prospective clinical study. PATIENTS: 66 consecutive patients with isolated severe aortic stenosis (aortic valve area ...
Silberman S - - 2001
BACKGROUND: Nonstented bioprostheses have been associated with lower resting gradients than stented bioprostheses or mechanical valves. We compared the hemodynamic performance of nonstented bioprostheses and mechanical valves with normal native aortic valves at rest and exercise. METHODS: Dobutamine echocardiography was used to assess gradients and effective orifice area index at ...
Morsy S - - 2001
Currently available aortic valve prostheses have satisfactory hemodynamic performance during rest, but with exercise they possess different responses. The objective was to compare the hemodynamic response of the stentless porcine bioprosthesis (SP) and the mechanical bileaflet prosthesis (MB) at rest and during peak exercise using dobutamine stress echocardiography (DSE). DSE ...
Han S S - - 2001
OBJECTIVE: To compare the clinical utility of contrast-enhanced color Doppler US in the differentiation of retinal detachment (RD) from vitreous membrane (VM) with that of various conventional US modalities, and to analyze the enhancement patterns in cases showing an enhancement effect. MATERIALS AND METHODS: In 32 eyes examined over a ...
Hundley W G - - 2001
OBJECTIVES: The goal of this study was to determine if cardiac cycle-dependent changes in proximal thoracic aortic area and distensibility are associated with exercise intolerance in elderly patients with diastolic heart failure (DHF). BACKGROUND: Aortic compliance declines substantially with age. We hypothesized that a reduction in cardiac cycle-dependent changes in ...
Laskey W K - - 2001
BACKGROUND: Although subvalvular gradients in patients with aortic stenosis have been described, their behavior and response to exercise have not been well characterized. METHODS AND RESULTS: Left ventricular and aortic pressures and linear flow velocity were measured with a catheter-tip manometer at rest and during supine exercise in 27 patients ...
Borghetti V - - 2001
OBJECTIVE: The 'double-orifice' (DO) technique has been proposed to simplify mitral valve repair (MVRep) in particular settings of mitral insufficiency. However, the haemodynamic effects of such a redesigned valve are poorly documented, particularly during stress conditions. Thus, we sought to evaluate the haemodynamic changes during exercise conditions after the DO ...
Takeichi Y - - 2001
OBJECTIVES: The aim of this study was to clarify the serial changes in left ventricular (LV) end-diastolic pressure (LVEDP) during dynamic exercise in patients with hypertrophic cardiomyopathy (HCM). BACKGROUND: Although HCM is characterized by impaired resting LV diastolic function, serial changes in LVEDP during exercise have not been characterized. METHODS: ...
Brenner D A - - 2001
In contrast to systolic function, which is relatively well preserved with advancing age, diastolic function declines steadily after age 30. Our goal was to determine whether changes in diastolic function that occur with aging could be reversed with exercise training. Methods and Results-- Adult (6-month-old) and old (24-month-old) Fischer 344/BNF1 ...
Sakate Y - - 2001
Doppler echocardiographic indices of left ventricular (LV) diastolic function are widely used to evaluate the cardiac function of patients with cardiac disease. However, there have been few reports about the relationship between Doppler indices and exercise capacity and so 44 patients with myocardial infarction were investigated by cardiopulmonary exercise testing ...
Aviles R J - - 2001
A subset of patients with mitral stenosis have symptoms out of proportion to the resting hemodynamics. Exercise Doppler echocardiography is a useful diagnostic modality to determine which patients are limited by their valve obstruction and would therefore benefit from percutaneous mitral balloon valvotomy. We analyzed 11 patients who showed a ...
Rowland T - - 2001
STUDY OBJECTIVE: Factors influencing diastolic filling of the left ventricle may serve as critical determinants of both maximal cardiac output and oxygen uptake. This study was conducted to assess diastolic filling dynamics of the left ventricle during progressive upright cycle exercise in children. METHODS: Twelve boys aged 10 to 14 ...
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