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Results 351 - 400 of 1046
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Weisenberg Daniel - - 2008
BACKGROUND AND AIM OF THE STUDY: The study aim was to assess the clinical utility and added value of exercise stress echocardiography (ESE) over exercise testing alone in asymptomatic patients with severe aortic stenosis (AS). METHODS: The results of treadmill ESE in 101 consecutive patients (59 males, 42 females; mean ...
Sekuri Cevad - - 2008
OBJECTIVES: The aim of this study was to assess the effects of losartan treatment on exercise tolerance and echocardiographic parameters in patients with mitral regurgitation (MR) secondary to mitral valve prolapse or rheumatic heart disease. METHODS: Twenty-seven patients (14 males, 13 females, mean age 51+/-11, range 21-76) with moderate MR ...
Ennezat Pierre V - - 2008
BACKGROUND: The mechanisms that contribute to limit functional capacity are incompletely understood in patients with preserved resting ejection fraction (HFpREF). We assessed left ventricular (LV) systolic response to dynamic exercise in patients with HFpREF and in patients with similar comorbidities to HFpREF patients but without history or evidence of heart ...
Yamano Tetsuhiro - - 2008
It has remained unclear why functional mitral regurgitation (MR), even if it is of a mild degree, has prognostic importance in patients with idiopathic dilated cardiomyopathy (IDC). Exercise-induced changes in functional MR, which might be a clue to this question, have not been fully clarified. Thus, in this study, semisupine ...
Leurent Guillaume - - 2009
AIMS: Exercise stress testing (EST) is recommended by guidelines to risk-stratify patients with asymptomatic valvular aortic stenosis (AS), though the role of quantitative exercise-Doppler echocardiography has rarely been studied. This prospective study sought to correlate standard EST results with the haemodynamic measurements made during exercise by Doppler echocardiography. METHODS AND ...
Beer Meinrad - - 2008
OBJECTIVES: The present study investigated changes in cardiac energy metabolism and function in patients with dilated cardiomyopathy (DCM) before and after exercise training (ET) with phosphorus-31 magnetic resonance spectroscopy (MRS) in combination with magnetic resonance imaging (MRI). BACKGROUND: Exercise training might have a beneficial role on myocardial function and oxidative ...
Witte Klaus K - - 2008
INTRODUCTION: Mitral regurgitation (MR) in chronic heart failure (CHF) patients frequently worsens with exercise. Cardiac resynchronization therapy (CRT) reduces MR at rest, but its effects on exercise-induced worsening of MR are incompletely explored. The present study examined the influence of CRT on MR during submaximal exercise in CHF patients. METHODS: ...
Maréchaux Sylvestre - - 2008
Besides its usefulness for the detection of exercise-induced ischemia, conventional exercise testing may help to predict the onset of clinical events and the need for surgery in asymptomatic patients with cardiac-valvular disease. Doppler echocardiography examination during exercise recently emerged as a new stress testing modality that may add useful information ...
Corradi Domenico - - 2008
Atrial fibrillation becomes a self-perpetuating arrhythmia as a consequence of electrophysiologic and structural remodeling involving the atrium. Oxidative stress may be a link between this rhythm disturbance and electrophysiologic remodeling. The aim of this study was to evaluate whether the heme oxygenase-1 (HO-1) marker of oxidative stress was more expressed ...
Adler Yehuda - - 2008
Individuals involved in intense resistance training present with increased absolute left ventricular (LV) wall thickness and mass and show good systolic responses to isometric exercise. There is no consensus regarding diastolic features and no available information regarding diastolic function in athletes during isometric exertion itself. Therefore, the main aim of ...
Samman Ahmed - - 2008
BACKGROUND: Adult patients with repaired tetralogy of Fallot (rTOF) often have diminished exercise capacity. The primary objective of this study was to examine whether abnormalities of biventricular function play a role in exercise limitation in patients with rTOF. METHODS: This was a retrospective review of 99 adult patients with rTOF. ...
Rohrer James E - - 2008
Since confidence is an important predictor of ability to lose weight, methods for increasing weight-control confidence are important. The purpose of this study was to test the relationship between short-term behavior changes ('behavioral bootstrapping') and change in weight-control confidence in a small prospective weight-loss project. Data were available from 38 ...
Spevack Daniel M - - 2008
BACKGROUND: Classification of diastolic heart function is best defined by the degree of leftward and upward shift of the diastolic pressure-volume relationship (DPVR). Direct measurement of DPVR, however, requires invasive techniques. Increased left atrial (LA) size is a marker of left ventricular (LV) diastolic hypertension, and so, the LA/LV diameter ...
Amundsen Brage H - - 2008
OBJECTIVE: To study the effect of aerobic treadmill exercise training with different intensity on left ventricular (LV) function in patients with stable coronary artery disease, using Strain Rate- and Tissue Doppler Imaging. DESIGN: Seventeen patients were randomly assigned to either moderate (50-60% of peak oxygen uptake (VO(2peak)) or high intensity ...
Kang Soo-Jin - - 2008
BACKGROUND: We evaluated the myocardial contractile reserve related to exercise-induced changes in functional mitral regurgitation (MR) by tissue Doppler imaging (TDI). METHODS: Supine bicycle exercise was performed in 35 patients with nonischemic cardiomyopathy (age 51 +/- 12 years; EF < 40%) and resting, and peak exercise 2D echocardiographic parameters, and ...
van Dalen Bas M - - 2008
BACKGROUND: Speckle tracking echocardiography is increasingly used to quantify left ventricular (LV) twist. However, one of the limitations of the assessment of LV twist by speckle tracking echocardiography is the crucial dependence on correct acquisition of a LV apical short-axis. This study sought to assess the influence of transducer position ...
Lancellotti Patrizio - - 2008
AIMS: Plasma B-type natriuretic peptide (BNP) is an emerging biomarker in heart failure. In this setting, the extent of left ventricular (LV) dyssynchrony contributes to exercise symptoms. Whether exercise-induced changes in LV dyssynchrony might be a trigger of BNP release has never been investigated. METHODS AND RESULTS: Fifty-seven patients with ...
Cheung Eddie W Y - - 2008
The myocardial performance index (MPI) has been proposed to be a simple echocardiographic index of right ventricular (RV) function in patients after surgical repair of tetralogy of Fallot (TOF). However, its functional status remains to be clarified. The functional implications of RV MPI were determined by exploring its relationships with ...
Ennezat Pierre V - - 2008
BACKGROUND: Functional mitral regurgitation (MR) is a powerful predictor of poor prognosis in patients with chronic heart failure (CHF) due to left ventricular systolic dysfunction (LVSD). However, severity of MR varies with dynamic exercise. Accordingly, we sought to assess the prognostic value of exercise-induced changes in functional MR in patients ...
Ha Jong-Won - - 2008
BACKGROUND: It has been recently demonstrated that the hemodynamic consequences of exercise-induced increase in left ventricular (LV) filling pressure can be demonstrated noninvasively with supine bicycle exercise Doppler echocardiography. One of the practical drawbacks of Doppler echocardiography for assessing LV filling during exercise is the technical difficulty obtaining adequate signals ...
Giallauria Francesco - - 2008
AIMS: To investigate the effects of exercise training (ET) on left ventricular (LV) volumes, cardiopulmonary functional capacity and N-terminal pro-brain natriuretic peptide (NT-proBNP) levels in postinfarction patients with moderate LV dysfunction. METHODS: Sixty-one postinfarction patients were randomized into two groups: group T [n=30, LV ejection fraction (EF) 41.6+/-11.3%, mean+/-SD] entered ...
Takamura Takeshi - - 2008
An exaggerated increase in systolic blood pressure prolongs myocardial relaxation and increases left ventricular (LV) chamber stiffness, resulting in an increase in LV filling pressure. We hypothesize that patients with a marked hypertensive response to exercise (HRE) have LV diastolic dysfunction leading to exercise intolerance, even in the absence of ...
Dorfman Todd A - - 2008
Bed rest deconditioning leads to physiological cardiac atrophy, which may compromise left ventricular (LV) filling during orthostatic stress by reducing diastolic untwisting and suction. To test this hypothesis, myocardial-tagged magnetic resonance imaging (MRI) was performed, and maximal untwisting rates of the endocardium, midwall, and epicardium were calculated by Harmonic Phase ...
Podolec Piotr - - 2008
BACKGROUND: Diastolic dysfunction and elevated left ventricular (LV) filling pressure at rest are key factors of exercise intolerance in patients with heart failure (HF). There are few studies, however, that have addressed the issue of changes of LV diastolic function and filling pressure during exercise in patients with HF with ...
Kerr Andrew J - - 2008
AIMS: To determine whether elevated B-type natriuretic peptide (BNP) predicts left ventricular (LV) contractile dysfunction on exercise stress echocardiography in patients with severe mitral regurgitation (MR). METHODS AND RESULTS: Thirty three patients with moderate-to-severe or severe MR, a LV ejection fraction > or =60% and New York Heart Association Class ...
Wang Yi-Chih - - 2008
Tissue Doppler imaging-derived intra-left ventricular (LV) contractile dyssynchrony is an evolving prognostic parameter for patients with systolic heart failure (HF). However, whether and how exercise could abolish the synchronicity in HF patients with narrow QRS remains less studied. We evaluated a total of 33 HF patients with impaired LV ejection ...
Ishii Katsuhisa - - 2008
To determine whether postischemic diastolic stunning could be detected using color kinesis, we evaluated regional left ventricular (LV) diastolic wall motion in 36 patients with stable effort angina and a coronary stenosis (> or = 70% of luminal diameter), and in 30 control subjects. Regional LV filling fraction in the ...
Maréchaux Sylvestre - - 2008
BACKGROUND: Patients with chronic heart failure (CHF) due to left ventricular systolic dysfunction (LVSD) may develop pulmonary hypertension at rest and during exercise. The cardiac correlates of pulmonary hypertension have been ascertained in the resting state, but seldom during exercise in these patients. AIMS: We sought to determine the cardiac ...
Berger Thomas - - 2008
OBJECTIVES: There is still little information about the cardiorespiratory effects of cardiac resynchronization therapy (CRT) in patients undergoing all-day physical activity. This study aimed to assess the effects of CRT on ventilatory perfusion coupling during submaximal exercise. METHODS: Metabolic and hemodynamic parameters were obtained during treadmill exercise testing as well ...
Fayad Georges - - 2008
BACKGROUND: Chordal cutting through atriotomy has been proposed to treat significant resting ischemic mitral regurgitation (MR) due to anterior leaflet tenting. In addition, MR may exacerbate during exercise not only trough exercise-induced ischemia but also through an increase in tenting area. Accordingly, we aimed to perform chordal cutting through aortotomy ...
Sundstedt Milena - - 2008
The aim of the present study was to quantify the left ventricular (LV) longitudinal motion during exercise at rest and during upright exercise in 24 healthy male endurance athletes. By using M-mode and two-dimensional echocardiography, the relative mitral annular motion and the absolute LV longitudinal axis was measured at end-diastole ...
Sandrock Markus - - 2008
OBJECTIVE: Chronic dynamic exercise leads to regulative and structural adaptations of the heart (athlete's heart). To what extent the enlargement and physiologic hypertrophy of the heart lead to changes in the function of the valves, particularly regurgitation, is not yet clear. The aim of this study was to examine the ...
Peteiro Jesús - - 2008
AIMS: The value of exercise echocardiography (EE) over resting echocardiography when this last incorporates information on mitral regurgitation (MR) is only partially known. Furthermore, limited data exist regarding the value of MR worsening during exercise in patients with left ventricular (LV) dysfunction. We investigate whether EE has incremental value over ...
Plehn Gunnar - - 2008
In patients with idiopathic dilated cardiomyopathy (IDCM) a prolongation of left ventricular (LV) systole at the expense of diastolic time was demonstrated. Our study was aimed to evaluate the effect of exercise on heart rate corrected diastolic time in controls, IDCM with and without LBBB, and patients with LBBB and ...
Cotrim Carlos - - 2008
The development of intra-ventricular gradients (IVG) during dobutamine or exercise stress is not infrequent, and can be associated to symptoms during stress. The purpose of this study was to assess the occurrence of IVG during exercise stress echocardiography in cardiac syndrome X patients. We prospectively evaluated 91 patients (pts) mean ...
Leosco Dario - - 2008
AIMS: We investigated whether exercise training could promote angiogenesis and improve blood perfusion and left ventricular (LV) remodelling of the post-myocardial infarction (MI) failing heart. We also explored the contribution of ameliorated beta-adrenergic receptor signalling and function on the overall improvement of cardiac contractility reserve induced by exercise. METHODS AND ...
Henriksen Egil - - 2008
The increase in left ventricular (LV) end-diastolic volume has recently been shown to explain more than 70% of the increase in stroke volume during upright exercise in endurance athletes. As the end-diastolic volume enhancement not could be explained by an increase in axial cavity length an augmentation in LV short-axis ...
Jhawar Manish - - 2009
Ischemic mitral regurgitation is a complication of coronary artery disease specifically in the settings of prior myocardial infarction. It is a dynamic lesion and its severity may increase with different forms of exercise leading to flash pulmonary edema. We present the case of an 81-year-old man with ischemic mitral regurgitation ...
Shah J S - - 2008
BACKGROUND: Resting left ventricular outflow tract obstruction (LVOTO) occurs in 25% of patients with hypertrophic cardiomyopathy (HCM) and is an important cause of symptoms and disease progression. The prevalence and clinical significance of exercise induced LVOTO in patients with symptomatic non-obstructive HCM is uncertain. METHODS AND RESULTS: 87 symptomatic patients ...
Boissiere Julien - - 2008
Exercise training and hypertension induced cardiac hypertrophy but modulate differently left ventricle (LV) function. This study set out to evaluate cardiac adaptations induced by moderate exercise training in normotensive and untreated severe hypertensive rats. Four groups of animals were studied: normotensive (Ctl) and severe hypertensive (HT) Wistar rats were assigned ...
Palmieri Vittorio - - 2008
OBJECTIVES: Left ventricular (LV) diastolic dysfunction is considered the earliest manifestation of diabetic cardiomyopathy. Whether LV abnormalities identified at rest by echocardiography predict peak exercise LV performance in uncomplicated type 1 diabetes mellitus (DM1) is largely unknown. RESEARCH DESIGN AND METHODS: We evaluated LV size, mass, and functions and peak ...
Gabriel R S - - 2008
OBJECTIVE: To determine whether plasma levels of B-type natriuretic peptide (BNP) predict left ventricular (LV) dysfunction on exercise echocardiography in patients with moderate to severe aortic regurgitation (AR). DESIGN: Case-control study. SETTING: Outpatient cardiology departments. PATIENTS: 39 asymptomatic or mildly symptomatic patients with chronic moderate to severe AR and a ...
Choi Eui-Young - - 2007
BACKGROUND: The present study sought to determine if echo-Doppler-derived pulmonary vascular resistance (PVR echo), net-atrioventricular compliance (Cn) and tricuspid peak systolic annular velocity (Sa), as parameters of right ventricular function, have value in predicting exercise capacity in patients with mitral stenosis (MS). METHODS AND RESULTS: Thirty-two patients with moderate or ...
Kim Hyung-Kwan - - 2008
BACKGROUND: On the basis of the close association of left atrial compliance with pulmonary hypertension in patients with mitral stenosis, we hypothesized that: (1) Doppler-derived net atrioventricular compliance (C(n)) can be used for predicting the occurrence of mitral valve (MV) replacement or percutaneous mitral commissurotomy (PMC); and (2) determinants of ...
Maréchaux Sylvestre - - 2007
BACKGROUND: While normal at rest, left ventricular (LV) systolic function may become abnormal during exercise in patients with aortic stenosis. Once contraindicated in patients with aortic stenosis, exercise testing is now recommended in asymptomatic patients with aortic stenosis to elicit symptoms and thereby ascertain the need for aortic valve replacement. ...
Salehian Omid - - 2008
BACKGROUND: Many patients with repaired tetralogy of Fallot (TOF) have clinically important pulmonary regurgitation that can eventually lead to right ventricular (RV) dilatation and dysfunction and associated morbidity and mortality. Unfortunately, standard echocardiographic techniques to evaluate RV size and function can be inaccurate. Newer Doppler modalities such as Doppler tissue ...
Rocha F L - - 2007
We evaluated the effects of swimming and anabolic steroids (AS) on ventricular function, collagen synthesis, and the local renin-angiotensin system in rats. Male Wistar rats were randomized into control (C), steroid (S; nandrolone decanoate; 5 mg/kg sc, 2x/wk), steroid + losartan (SL; 20 mg.kg(-1).day(-1)), trained (T), trained + steroid (T+S), ...
Hanauer Aline D - - 2007
Subglottic stenosis (SGS) is defined as the narrowing of the lower larynx. Difficulties in the management of subglottic stenosis, especially in the pediatric population, justify the development of experimental models. The objective of this study was to compare the two methods of experimental subglottic stenosis induction. Twenty-three dogs were randomly ...
Bougault V - - 2008
Tissue Doppler imaging (TDI) is an echocardiographic technique used during exercising to improve the accuracy of a cardiovascular diagnostic. The validity of TDI requires its reproducibility, which has never been challenged during moderate to maximal intensity exercising. The present study was specifically designed to assess the transmitral Doppler and pulsed ...
Choi Eui-Young - - 2008
Relative aldosterone excess is associated with endothelial dysfunction and higher incidence of end organ damage. We sought to investigate whether plasma aldosterone-to-renin ratio (ARR) is associated with left ventricular (LV) longitudinal function reserve to exercise in patients with controlled hypertension. In the patients with controlled and uncomplicated hypertension without overt ...
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