Search Results
Results 501 - 550 of 1046
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Ha Jong-Won - - 2005
Left ventricular filling pressures can be estimated reliably by combining mitral inflow early diastolic velocity (E) and annulus velocity (E'). An increased E/E' ratio reflects elevated filling pressures and may be useful in assessing an abnormal increase in filling pressures for patients with diastolic dysfunction. The purpose of this study ...
Dayan Anat - - 2005
The effect of exercise training prior to acute myocardial infarction (AMI) on left ventricular (LV) remodeling is poorly understood. This study investigated the protective effect of 3 weeks of swimming exercise training prior to AMI on cardiac morphology and function. Male Sprague-Dawley rats (n = 35) were randomly assigned to ...
Yalamanchili Kishore - - 2005
A 29-year-old man with pectus excavatum presented with exercise intolerance, pulsus paradoxus, and paradoxically split S2. Chest computed tomography (CT) showed the heart shifted leftward and a pectus severity index of 7.18. Cardiopulmonary exercise study showed reduced VO2max, anaerobic threshold, and oxygen pulse. Echocardiography revealed a decline in mitral and ...
Zamorano José - - 2004
BACKGROUND: In the last decade, multiple studies depicted discrepancies between mitral valvular orifice area (MVA) measurements obtained with the pressure half-time (PHT) method and invasive methods during the immediate post-percutaneous mitral valvuloplasty (PMV) period. Our aim was to assess the accuracy of Real-Time 3D echo (RT3D) to measure the MVA ...
Kim Gi Beom - - 2004
BACKGROUND: Based on the hypothesis that vascular dysfunction in the ascending aorta can cause morbidity, we undertook this study on the elastic properties of ascending aorta and left ventricular (LV) function in young children who received coarctoplasty in early infancy. METHODS: Blood pressures (BP) in the right arm and ascending ...
Pierson Lee M - - 2004
The purpose of this study was to determine the relation between left ventricular (LV) geometry and exercise capacity in unmedicated, hypertensive patients. Analysis of the data revealed peak oxygen consumption (ml kg(-1) min(-1)) for concentric hypertrophy (corrected mean +/- SE 23.5 +/- 1.2) was significantly less (F = 3.68, p ...
Cingöz Faruk - - 2004
BACKGROUND: Satisfactory results of bileaflet preserving mitral valve replacement (MVR) had forced several institutes to preserve both leaflets during MVR. Modifications were required to prevent the preserved tissue from interfering with prosthetic valve function, to implant an adequate size of valve and to prevent left ventricle outflow tract (LVOT) obstruction. ...
Kim Hyung-Kwan - - 2004
BACKGROUND: Mitral regurgitation (MR) is known as one of the most frequent causes of heart failure and sudden death. In spite of increasing prevalence of MR, there have been no available data on cardiac determinants of exercise capacity in patients with chronic MR. HYPOTHESIS: This study aimed to investigate cardiac ...
Ditting Tilmann - - 2005
Left ventricular (LV) end-diastolic pressure (LVEDP) increase due to volume expansion (VExp) enhances mechanosensitive vagal cardiac afferent C-fiber activity (CNFA), thus decreasing renal sympathetic nerve activity (RSNA). Hypotensive hemorrhage (hHem) attenuates RSNA despite decreased LVEDP. We hypothesized that CNFA increases with any change in LVEDP. Coronary perfusion pressure (CPP), supposedly ...
Sakurai Susumu - - 2004
Paradoxical outward movement of left ventricular (LV) inferior wall in systole is occasionally recognized in normal subjects and clinically important in terms of the differential diagnosis between physiological pseudo-asynergy and pathological asynergy. In this study, the potential mechanisms by which pseudo-asynergy of LV inferior wall (PLI) is observed in normal ...
Goodman Jack M - - 2005
This study examined the effects of short-term endurance training (ET) on the left ventricular (LV) adaptation and functional response to a series of exercise challenges with increasing intensity. Eight untrained men, with a mean age of 19.4 +/- 0.5 (SE) yr, were studied before and after 6 days of ET ...
Trueblood Nathan A - - 2005
After myocardial infarction (MI), there is progressive left ventricular (LV) remodeling and impaired exercise capacity. We tested the hypothesis that LV remodeling results in structural and functional changes that determine exercise impairment post-MI. Rats underwent coronary artery ligation (n = 12) or sham (n = 11) surgery followed by serial ...
Akar Fadi G FG Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, Md 21205, - - 2004
Heart Failure (HF) is associated with an increased risk of sudden death caused by ventricular tachyarrhythmias. Recent studies have implicated repolarization abnormalities and, in particular, exaggerated heterogeneity of transmural repolarization in the genesis of polymorphic ventricular tachycardia in a canine model of nonischemic dilated cardiomyopathy. The presence and degree to ...
Chambers John - - 2004
BACKGROUND AND AIM OF THE STUDY: Although stentless valves are expected to be hemodynamically superior to stented valves, the results of comparative trials have been inconsistent. The study aim was to compare hemodynamic function at rest and on exercise in 50 stentless and stented biological replacement aortic valves METHODS: Twenty-one ...
Najjar Samer S - - 2004
OBJECTIVES: The goal of this study was to examine the age-associated differences in ventricular-vascular coupling, defined by the ratio of arterial elastance (EaI) to left ventricular systolic elastance (E(LV)I), and its components, at rest and during exercise. BACKGROUND: Ejection fraction (EF) increases during exercise, but the EF reserve decreases with ...
Adams M Jacob - - 2004
PURPOSE: Cardiovascular status was assessed in 48 Hodgkin's disease (HD) survivors at a median of 14.3 years (range, 5.9 to 27.5 years) after diagnosis because they may be at increased risk for cardiovascular abnormalities. PATIENTS AND METHODS: Patients completed the Short-Form 36 quality-of-life instrument and were screened by echocardiography, exercise ...
Pandolfino John E - - 2004
BACKGROUND AND AIM: Although strenuous exercise has been reported to increase gastroesophageal reflux, there are few data exploring the mechanism behind this relationship. The aim of this study was to use vigorous exercise as a provocation for strain-induced reflux and examine the correlation between endoscopically assessed EGJ integrity and exercise-induced ...
George K P - - 2004
BACKGROUND: Prolonged steady state exercise can lead to a decrease in left ventricular (LV) function as well as promote the release of cardiac troponin T (cTnT). There is limited information on the effect of intermittent high intensity exercise of moderate duration. OBJECTIVES: To determine the effect of intermittent high intensity ...
Mottram Philip M - - 2004
BACKGROUND: Diastolic heart failure (DHF) is characterized by dyspnea due to increased left ventricular (LV) filling pressures during stress. We sought the relationship of exercise-induced increases in B-type natriuretic peptide (BNP) to LV filling pressures and parameters of cardiovascular performance in suspected DHF. METHODS: Twenty-six treated hypertensive patients with suspected ...
Harada Kenji - - 2004
Doppler tissue imaging (DTI) has been developed to assess ventricular wall-motion velocity quantitatively for patients with various types of heart disease. This technique has a possibility of assessing right ventricular (RV) function reserve during exercise. To investigate RV function during exercise using DTI, 21 patients (9.3 +/- 3.3 years) who ...
Reboul C - - 2005
This study questioned the effect of living and training at moderate altitude on cardiac morphological and functional adaptations and tested the incidences of potential specific adaptations compared with aerobic sea level training on maximal left ventricular performance. Sea level-native rats were randomly assigned to N (living in normoxia), NT (living ...
Park Sungha - - 2004
A large left atrial (LA) V wave can be observed in patients with pure mitral stenosis (MS) due to decreased LA compliance. Based on the hypothesis that exercise capacity may correlate with the magnitude of the LA V wave in patients with MS, symptom-limited exercise testing and right and left ...
Wu Wen-Chih - - 2004
Stress echocardiography plays an important role in evaluating asymptomatic patients with significant mitral stenosis and symptomatic patients with only mild disease at rest, as it correlates the exercise-induced symptoms with changes in transmitral gradients, pulmonary pressures, and mitral valve area. In patients with mitral regurgitation (MR), exercise or dobutamine protocols ...
Meyer Timothy E - - 2004
Impaired exercise tolerance, determined by peak oxygen consumption (VO2 peak), is predictive of mortality and the necessity for cardiac transplantation in patients with chronic heart failure (HF). However, the role of left ventricular (LV) diastolic function at rest, reflected by chamber stiffness assessed echocardiographically, as a determinant of exercise tolerance ...
McCully Robert B RB Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic College of Medicine, Rochester, Minn 55905, - - 2004
To characterize the prognostic implications of exercise echocardiography in patients who have reduced exercise capacity at the time of testing. We examined the outcomes of 941 patients at the Mayo Clinic in Rochester, Minn, between January 1, 1990, and December 31, 1995, who had reduced exercise capacity on exercise echocardiography ...
Quintana Miguel - - 2004
Tissue-Doppler echocardiography (TDE) has been introduced to quantify stress echocardiography by means of assessing the left ventricular (LV) segmental myocardial velocities and excursion. The interaction between LV long- and short-axis function during physical exercise has not been elucidated completely. The aim of the present study was to investigate long- and ...
Takada Yasuo - - 2004
This study was designed to determine the effects of antiarrhythmic agents on global left ventricular (LV) function during exercise in patients with chronic LV dysfunction. Thirty-five patients with LV dysfunction [LV ejection fraction (LVEF) < 45%] and ventricular arrhythmias were studied. They were randomly classified into 3 groups: patients who ...
Yu Cheuk-Man - - 2004
BACKGROUND: A cardiac rehabilitation and prevention program (CRPP) is a recognized nonpharmacological modality in the management of coronary heart disease (CHD). However, the effect of a CRPP on systolic function of the heart is controversial, and no data exists on diastolic function in CHD. A randomized, controlled study was conducted ...
D'Andrea A - - 2004
AIM OF THE STUDY: To detect in adult patients late after repair of Tetralogy of Fallot (TOF) possible correlation between myocardial parameters assessed at rest by Tissue Doppler (TD) and cardiac performance during physical effort. METHODS: Doppler echo, treadmill test and pulsed TD of both mitral and tricuspid annulus were ...
McGavock Jonathan - - 2004
BACKGROUND: Type 2 diabetes mellitus (DM-2) is one of the most prevalent chronic diseases of the aged and contributes to a significant amount of cardiovascular disease morbidity and mortality. Exercise training may be beneficial in attenuating the cardiovascular maladaptations associated with DM-2. The purpose of this study was to examine ...
Hillis Graham S - - 2004
OBJECTIVES: The aim of this study was to determine the prevalence and prognostic implications of dyskinesia developing after exercise. BACKGROUND: The prevalence and prognostic implications of new-onset dyskinesia with exercise testing have not been previously described. METHODS: We considered 1005 consecutive patients who underwent exercise echocardiography and had akinetic segments ...
Skaluba Stanislaw J - - 2004
BACKGROUND: A decreased ratio of early to late diastolic mitral inflow velocities (E/A <1.0) reflects slowing of left ventricular (LV) relaxation. This finding is widely believed to indicate significant diastolic dysfunction. However, E/A <1.0 is common during normal aging and often is not associated with symptoms of heart failure. We ...
Omedè P - - 2004
AIM: In patients with mitral stenosis, symptoms do not always correlate with echocardiographic data. The aims of the study were to evaluate the role of cardiopulmonary exercise testing in the assessment of patients with mitral stenosis and to quantify nitric oxide production at rest and at the end of exercise. ...
Kubo Norifumi - - 2004
BACKGROUND: The effects of physical training on ventricular remodeling after extensive anterior acute myocardial infarction (AMI) have not yet been defined. This randomized controlled study examines whether exercise aggravates left ventricular (LV) remodeling in patients with extensive anterior AMI. METHODS: Forty-eight consecutive patients with a first extensive anterior AMI and ...
Gohlke-Bärwolf Christa - - 2004
Prospective studies have convincingly shown that sudden death in asymptomatic patients with AS is rare and prognosis is good as long as LV function, exercise tolerance and exercise hemodynamics remain normal. The time interval to development of LV dysfunction is not known. Therefore the initial evaluation should be confirmed after ...
Yuda S - - 2004
To clarify the mechanism of improvement in exercise capacity after the maze procedure. Retrospective study. Tertiary referral centre. 26 patients (mean (SD) age 57 (9) years) with atrial fibrillation (AF) and mitral valve disease were studied with echocardiography and cardiopulmonary exercise testing before and after the maze procedure combined with ...
Lancellotti Patrizio - - 2003
OBJECTIVES: We sought to examine the determinants of exercise-induced changes in ischemic mitral regurgitation (MR) in patients with left ventricular (LV) dysfunction. BACKGROUND: In the post-myocardial infarction (MI) phase, ischemic MR contributes to worsening of symptoms and of LV dysfunction. METHODS: In this study, 70 patients in the chronic, post-MI ...
Stoylen A - - 2003
AIMS: To study left ventricular mechanics of exercise with Doppler and tissue Doppler. METHODS AND RESULTS: Twenty-one males (mean age, 26; height, 184 cm; weight, 84 kg), exercised on a bicycle, with increasing workload, with oxygen uptake, Doppler flow and tissue Doppler recordings during exercise. There was correlation between peak ...
Gates Phillip E - - 2003
AIMS: We sought to determine if attenuation of the age-associated increase in arterial stiffness by habitual aerobic-endurance exercise would have corresponding effects on left ventricular (LV) structure and diastolic function. METHODS AND RESULTS: We performed a cross-sectional study on 138 young, middle-aged, and older men who were either sedentary, recreationally ...
Stickland Michael K - - 2003
The purpose of this study was to examine the effects of a 20 km cycle race (TT) on left ventricular (LV) systolic and pulmonary function in 12 endurance cyclists. Spirometry, single-breath diffusion capacity (DLCO) with partitioning of membrane (DM) and capillary blood volume (Vc) components and 2-D echocardiograms were performed ...
Isobe Satoshi - - 2003
Many studies have demonstrated that reduced left ventricular (LV) diastolic distensibility plays a key role in the pathophysiology of hypertrophic cardiomyopathy (HCM). However, the relationship between myocardial ischemia and reduced LV distensibility in HCM remains unclear. We aimed to clarify the relationship between exercise-induced ischemia and reduced LV distensibility in ...
Waagstein F - - 2003
the effects of long-term administration of beta-blockers on left ventricular (LV) function during exercise in patients with ischemic heart disease (IHD) and idiopathic dilated cardiomyopathy (DCM) are controversial. patients with stable congestive heart failure (CHF) (New York heart association [NYHA] class II and III) and ejection fraction (EF) < or ...
Lancellotti Patrizio - - 2003
BACKGROUND: In the post-myocardial infarction phase, mortality risk is related to the severity of mitral regurgitation (MR). Ischemic MR is a dynamic condition that can be studied during exercise. Whether the assessment of exercise-induced changes in the degree of MR provides prognostic information is unknown. METHODS AND RESULTS: Ninety-eight consecutive ...
Raghuveer Geetha - - 2003
BACKGROUND: Prosthesis survival, growth, and functional status after initial mechanical mitral valve replacement (MVR) in children <5 years of age are poorly defined. METHODS AND RESULTS: The experience of the Pediatric Cardiac Care Consortium (45 centers, 1982 to 1999), which included 102 survivors after initial MVR, was analyzed. Median follow-up: ...
Timek Tomasz A - - 2003
BACKGROUND: Alfieri edge-to-edge mitral repair has been used clinically with ring annuloplasty to correct ischemic mitral regurgitation (IMR), but its efficacy without concomitant ring annuloplasty has not been described in this setting. METHODS: Seventeen sheep underwent implantation of 9 radiopaque markers on the left ventricle, 8 on the mitral annulus ...
Libonati Joseph R - - 2003
PURPOSE: The purpose of this study was to determine the effects of exercise training on LV geometry and LV diastolic function in a rat model of MI. METHODS: One month after MI induced by ligation of the left anterior descending artery (N = 45) or sham operation (N = 26), ...
Wright D J - - 2003
Procedural technical success of balloon mitral valvuloplasty (BMV) is indicated by an increase in valve area and a reduction in transvalvar gradient, but there are conflicting results regarding whether these indicators correlate with subsequent improvements in exercise capacity. We conducted a study to explore the effects of valvuloplasty on cardiac ...
Spinelli Letizia - - 2003
Exercise-induced impairment of left ventricular (LV) ejection fraction is common in patients with acromegaly and normal resting systolic function. This study aimed to clarify whether diastolic dysfunction plays a role in the abnormal adaptation to exercise in these patients. Forty-eight patients with active acromegaly underwent LV radionuclide angiography at rest ...
Wan Nudri W D WD - - 2003
A cross-sectional comparative study was conducted to determine the nutritional status among physically active groups in Kota Bharu. The study population comprised 83 adult male athletes from 8 different types of sports (athlete group), 80 active men who exercised a minimum of 30 min per day for at least 3 ...
Arosio Beatrice - - 2003
Adenosine (Ado), a naturally occurring autacoid, exerts cardioprotective effects against myocardial ischemia and reperfusion injury, through activation of its receptors type 1 (A1) and 2A (A2A). Since ageing involves a complex change in these effects, we evaluated A1 and A2A gene expression in left (LV) and right ventricle (RV) from ...
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