Search Results
Results 251 - 300 of 552
< 1 2 3 4 5 6 7 8 9 10 11 >
Wensel Roland - - 2004
In chronic heart failure (CHF), the abnormally large ventilatory response to exercise (VE/VCO(2) slope) has 2 conceptual elements: the requirement of restraining arterial partial pressure of carbon dioxide (pCO(2)) from increasing (because of an increased ratio between increased physiologic dead space and tidal volume [VD/VT]) and the depression of arterial ...
Kinugawa Toru - - 2004
Chronic heart failure (CHF) is associated with abnormal neurohormonal profiles and increased ventilatory response to exercise. This study determined if treatment with angiotensin II type 1 receptor antagonist, losartan, improves ventilatory efficiency and neurohormonal factors in patients with CHF. Symptom-limited cardiopulmonary exercise testing was performed after a 2-week placebo period ...
Kjaer Andreas A Department of Clinical Physiology and Nuclear Medicine, Frederiksberg Hospital, University of Copenhagen, Frederiksberg, Denmark. - - 2004
Neuroendocrine activation is a pathophysiological response and an important prognostic marker in patients with chronic heart failure (CHF). Although chronic activation is well described, data on the responsiveness of the hormone systems are more limited. Most previous studies have looked at activation during maximal exercise, whereas we believe that activation ...
van den Berg-Emons Rita - - 2004
Due to dyspnea and fatigue, patients with chronic heart failure (CHF) are often restricted in the performance of everyday activities, which gradually may lead to hypoactivity. To assess whether aerobic training leads to a more active lifestyle and improved quality of life (QoL) in patients with CHF. Patients with stable ...
Meyer Tim - - 2004
The safety and efficacy of exercise training in patients with chronic heart failure (CHF) have been reported in a large number of scientific studies, with endurance training representing the most frequently applied training stimulus. Beneath the common continuous method of endurance training, the interval method (short bouts of intense exercise ...
Xiang Sue - - 2003
BACKGROUND: Salivary endothelin (ET) concentrations have been shown to correlate with disease severity in patients with chronic heart failure (CHF). We undertook the present study to evaluate the stability of salivary ET under different handling conditions to assess its suitability as a biochemical marker in screening, diagnosis, and management of ...
Nap Alexander - - 2003
Congestive heart failure (CHF) is characterised by activation of the renin-angiotensin-aldosterone system (RAAS) and the sympathetic nervous system (SNS). Both systems are known to interact and to potentiate each other s activities. We recently demonstrated that angiotensin II (Ang II) enhances sympathetic nerve traffic via prejunctionally-located AT1-receptors. At present, little ...
Wolk Robert - - 2003
OBJECTIVES: The aim of the study was to test the hypothesis that leptin is involved in the regulation of ventilatory responses to exercise in chronic heart failure (CHF). BACKGROUND: Exercise-induced hyperventilation is a negative prognostic factor in CHF. Studies in animals suggest that leptin, a hormone secreted by adipocytes, contributes ...
Seshadri Niranjan - - 2003
Carbon monoxide (CO) and nitric oxide (NO) are endogenous vasoregulatory molecules whose role in heart failure is not fully known. Exhaled CO and NO measurement provide novel noninvasive assessment of their endogenous production. We compared exhaled CO and NO in 24 patients with advanced ischemic and nonischemic cardiomyopathy and in ...
Erbs Sandra - - 2003
BACKGROUND: Exercise training (ET) has been shown to improve functional work capacity in patients with stable chronic heart failure (CHF) having moderate symptoms (NYHA class II). This analysis was conducted, to evaluate the effects of ET on left ventricular function and haemodynamics in patients with advanced CHF (NYHA class III) ...
Gielen Stephan - - 2003
OBJECTIVES: The aim of this study was to assess the effects of regular physical exercise on local inflammatory parameters in the skeletal muscle of patients with chronic heart failure (CHF). BACKGROUND: Inflammatory activation with increased serum cytokine levels and expression of inducible nitric oxide synthase (iNOS) in the myocardium and ...
Blanchet Martine - - 2003
Patients with congestive heart failure (CHF) exhibit a decrease in maximal exercise capacity in response to a cold environment. The aim of this study was to further investigate the impact of cold exposure on submaximal exercise capacity, systemic adrenergic drive, and the effects of long-term beta-adrenergic blockade on these parameters. ...
Darze Eduardo S - - 2003
BACKGROUND: Patients with congestive heart failure (CHF) have increased ventilatory equivalent for carbon dioxide (Ve/VCO(2)), which may contribute to the symptom of exercise-induced hyperpnea. We have developed a technique in which simultaneous blood volume single photon emission computed tomography imaging and transmission tomography are used to measure extravascular lung density ...
Androne A S - - 2003
OBJECTIVE: To characterise the effects of acetylcholinesterase inhibition with pyridostigmine on parasympathetic tone in patients with chronic heart failure (CHF). DESIGN: Prospective randomised, double blind crossover trial. SETTING: University hospital outpatient heart failure clinic. PATIENTS: 20 ambulatory subjects with stable CHF (mean age 55 years, mean ejection fraction 24%). INTERVENTIONS: ...
Jankowska Ewa A - - 2003
BACKGROUND: Patients with chronic heart failure (CHF) are characterised by an increased ventilatory response to exercise. The role of exercise ventilation in the risk stratification and evaluation of patients with CHF has not yet been established. AIM: To examine the relationship between exercise ventilation indices and clinical parameters of CHF ...
Racine Normand - - 2003
Decreased heart rate recovery (HRR) is a predictor of mortality in patients with coronary artery disease and preserved left ventricular function. We investigated the changes in HRR and assessed the impact of beta-blockade therapy on these parameters in patients with symptomatic congestive heart failure (CHF). HRR, defined as the difference ...
Cider Asa - - 2003
Hydrotherapy, i.e. exercise in warm water, as a rehabilitation program has been considered potentially dangerous in patients with chronic heart failure (CHF) due to the increased venous return caused by the hydrostatic pressure. However, hydrotherapy has advantages compared to conventional training. We studied the applicability of an exercise programme in ...
Pliquett R U - - 2003
The reflex regulation of sympathetic nerve activity has been demonstrated to be impaired in the chronic heart failure (CHF) state compared with the normal condition (Liu JL, Murakami H, and Zucker IH. Circ Res 82: 496-502, 1998). Exercise training (Ex) appears to be beneficial to patients with CHF and has ...
Adamopoulos Stamatis - - 2003
Recent experimental and clinical data have shown that physical training is an important therapeutic intervention in the management of patients with chronic heart failure (CHF), improving central hemodynamics and attenuating peripheral abnormalities (endothelial dysfunction and skeletal myopathy) characterizing the progression of the syndrome. Additionally, physical training seems to beneficially modulate ...
Filippatos Gerasimos S - - 2003
Apoptosis has been found in skeletal muscles of patients with chronic heart failure (CHF) and has been associated with exercise intolerance. In CHF, cachexia is characterized by neurohormonal activation and muscle wasting. Neurohormonal activation can lead to cell death and fibrosis. The purpose of the study was to determine the ...
Leite Joao J - - 2003
OBJECTIVES: We hypothesized that exercise-related periodic breathing (EPB) would be associated with poor prognosis in advanced chronic heart failure (CHF). BACKGROUND: Patients with CHF might present instability of the ventilatory control system characterized by cyclic waxing and waning of tidal volume (periodic breathing [PB]). This condition is associated with several ...
Vanness J Mark - - 2003
PURPOSE: The purpose of this study was to examine physiological responses of persons with chronic fatigue syndrome (CFS) to a graded exercise test. METHODS: Cardiopulmonary exercise tests were performed on 189 patients diagnosed with CFS. Based on values for peak oxygen consumption, patients were assigned to one of four impairment ...
Harris Stuart - - 2003
AIMS: Recent guidelines recommend regular exercise in the management of patients with chronic heart failure (CHF). This study was designed to compare the safety and efficacy of conventional bicycle exercise and functional electrical stimulation (FES) of the legs as forms of home-based exercise training for patients with stable CHF. METHODS ...
Arzt Michael - - 2003
BACKGROUND: In patients with chronic heart failure (CHF), central sleep apnea (CSA) and enhanced ventilatory response (VE/VCO2 slope) to exercise are common. Both breathing disorders alone indicate poor prognosis in CHF. Although augmented chemosensitivity to CO2 is thought to be one important underlying mechanism for both breathing disorders, it is ...
Schroeder C Andrew - - 2003
BACKGROUND: Congestive heart failure (CHF) patients experience dyspnea on exertion and therefore have decreased exercise tolerance. OBJECTIVE: This study explores the hypothesis that stable New York Heart Association (NYHA) class III CHF patients without a history of pulmonary disease exhibit airflow limitation with increasing exercise. METHODS: We characterized flow limitations ...
Ferrari R - - 2003
Chronic heart failure (CHF) is a common and disabling syndrome with a poor prognosis. It is a major and increasing public health problem. Angiotensin-converting enzyme inhibitors, diuretics, and digitalis are the standards treatments for CHF. Other drugs, such as beta-blockers, spironolactone, calcium antagonists, vasodilators, and antiarrhythmic agents are used to ...
Scott Adam C - - 2003
BACKGROUND: An important role of the increased stimulation of skeletal muscle ergoreceptors (intramuscular afferents sensitive to products of muscle work) in the genesis of symptoms of exertion intolerance in chronic heart failure (CHF) has been proposed. With the use of selective infusions and dietary manipulation methods, we sought to identify ...
Mancini Donna M - - 2003
BACKGROUND: Patients with chronic heart failure (CHF) are frequently anemic. An increase in hemoglobin could enhance exercise performance by increasing oxygen delivery. We investigated the effect of erythropoietin (EPO) on exercise performance in anemic patients with CHF. METHODS AND RESULTS: Twenty-six anemic patients aged 57+/-11 years were randomized to receive ...
Kinugawa Toru - - 2003
Chronic heart failure (CHF) is characterized by the activation of neurohormones and cytokines. Strenuous exercise causes activation of both systems but the effect of acute bouts of exercise on cytokines is not known in patients with CHF. This study determined whether maximal exercise induces activation of cytokines in CHF. Plasma ...
Schulze P Christian - - 2003
Patients with chronic heart failure (CHF) have metabolic abnormalities, leading to a catabolic syndrome, with progressive loss of skeletal muscle in advanced stages of the disease. Leptin, the product of an obesity gene, has been associated with energy expenditure and weight regulation. The aim of this study was to assess ...
Gitt Anselm K - - 2002
BACKGROUND: The maximal oxygen uptake (peak VO2) is used in risk stratification of patients with chronic heart failure (CHF). Peak VO2 might be lower than maximally possible if exercise is stopped early because of lack of patient motivation or premature cessation by the investigator. In contrast, the anaerobic threshold (VO2AT) ...
Conraads V M - - 2002
AIMS: Physical reconditioning of patients with chronic heart failure (CHF) improves exercise capacity and restores endothelial function and skeletal muscle changes. The effects of 4 months combined endurance/resistance exercise training on cytokines and cytokine receptors in patients with CHF were studied. In addition, changes in submaximal and maximal exercise performance ...
Francis Darrel P - - 2002
Metabolic exercise testing is valuable in patients with chronic heart failure (CHF), but periodic breathing may confound the measurements. We aimed to examine the effects of periodic breathing on the measurement of oxygen uptake ( V*O(2)) and respiratory exchange ratio (RER). First, we measured the effects of different averaging procedures ...
Beniaminovitz Ainat - - 2002
OBJECTIVES: The purpose of this study was to demonstrate in patients with moderate to severe heart failure that exertional dyspnea can be alleviated by improving muscle function. BACKGROUND: Dyspnea is a frequent limiting symptom in patients with chronic heart failure (CHF). This sensation may originate from activation of receptors in ...
Scharf Christoph - - 2002
BACKGROUND: Prognostic parameters in patients with congestive heart failure (CHF) are important for guiding therapeutic options. Maximal oxygen uptake (O(2)max) is a widely used parameter for prognostic assessment in patients with CHF and correlates with exercise cardiac output; however, afterload is not taken into account. METHODS: The concept of a ...
Firoozi S - - 2002
AIMS: Surgical myectomy has been successfully used to treat patients with symptomatic obstructive hypertrophic cardiomyopathy (HCM). More recently, alcohol septal ablation has been advocated as a less invasive, but equally effective alternative therapy. The aim of this non-randomized cohort study was to compare subjective and objective outcomes in patients undergoing ...
Abraham M Roselle - - 2002
BACKGROUND: The gene encoding ACE exhibits an insertion/deletion polymorphism resulting in 3 genotypes (DD, ID, and II), which affects serum and tissue ACE activity as well as other vasoactive substances. Pulmonary function is frequently abnormal in patients with congestive heart failure (CHF), the mechanism of which has not been completely ...
Schulze Paul Christian - - 2002
Although the clinical picture of cardiac cachexia is well-known in patients with advanced chronic heart failure (CHF) the factors that determine who is at risk for this progressive catabolic syndrome and who is not remain unclear. Different endocrine systems have been accused of being involved in this process: an imbalance ...
Bocchi Edimar Alcides - - 2002
BACKGROUND: Erectile dysfunction (ED) is common in patients with congestive heart failure (CHF). ED reduces quality of life, and it may affect compliance, thereby impairing the success of CHF treatment. METHODS AND RESULTS: In the first phase (fixed-dose double-blind, randomized, placebo-controlled, two-way crossover study), we studied in 23 men with ...
Witte Klaus K A - - 2002
BACKGROUND: Patients with chronic heart failure (CHF) complain of breathlessness and fatigue on exertion, have reduced peak oxygen consumption (pV(O(2))), and an increased ventilatory response to exercise (V(E)/V(CO(2)) slope). These limitations correlate with abnormalities of spirometry (forced expiratory volume in 1 second [FEV(1)] and forced ventilatory capacity [FVC]). Increased airway ...
Lissin Lynette W - - 2002
OBJECTIVE: To evaluate the prognostic characteristics of body mass index (BMI) and standard exercise test variables in a consecutive series of patients with mild to moderate congestive heart failure (CHF) referred for standard exercise tests. BACKGROUND: Controversy exists regarding the prognostic importance of BMI, etiology, and exercise test variables in ...
Scott Adam C - - 2002
BACKGROUND: The overactivity of ergoreceptors (intramuscular afferents sensitive to products of skeletal muscle work) may be responsible for the abnormal responses to exercise and symptoms of exercise intolerance in chronic heart failure (CHF); however, little is known of the chemical nature of the stimuli involved. We investigated biochemical factors (H+, ...
Cheetham Craig - - 2002
Exercise is now considered an important component of management in chronic heart failure (CHF), but little is known about central hemodynamic changes that occur during different exercise modalities in these patients. Seventeen patients (ejection fraction 25 +/- 2%) undertook brachial artery and right heart catheterization and oxygen consumption assessment at ...
Liu Jun-Li - - 2002
Moderate exercise training (Ex) enhances work capacity and quality of life in patients with chronic heart failure (CHF). We investigated the autonomic components of resting heart rate (HR) and the baroreflex control of HR in conscious, instrumented rabbits with pacing-induced CHF after Ex. Sham and CHF rabbits were exercise trained ...
Bussières Lizanne M - - 2002
BACKGROUND: The relationship between lower limbs maximal vasodilatory capacity and exercise capacity in congestive heart failure (CHF) and healthy subjects has been well-documented. However, the relationship between upper limbs maximal vasodilatory capacity and exercise is less well-established. METHODS AND RESULTS: Twelve patients with CHF, 16 age-matched normal subjects, and 11 ...
Traverse Jay H - - 2002
Coronary blood flow (CBF) and myocardial oxygen consumption (MVO(2)) are reduced in dogs with pacing-induced congestive heart failure (CHF), which suggests that energy metabolism is downregulated. Because nitric oxide (NO) can inhibit mitochondrial respiration, we examined the effects of NO inhibition on CBF and MVO(2) in dogs with CHF. CBF ...
Shiotani Issei - - 2002
Leg venous pressure markedly falls during upright exercise via a muscle pump effect, creating de novo perfusion pressure. We examined physiological roles of this mechanism in increasing femoral artery blood flow (FABF) and its alterations in chronic heart failure (CHF). In 10 normal subjects and 10 patients with CHF, standard ...
Larsen Alf Inge - - 2002
BACKGROUND: In patients with congestive heart failure (CHF) there is a shift from aerobic type I muscle fibres to less aerobic type II fibres. Exercise training has been shown to have beneficial effects on exercise performance, peripheral pathology and the neurohumoral profile in stable patients with CHF. This study evaluated ...
Gielen S - - 2002
Endothelial dysfunction (ED) has been documented in patients with both coronary artery disease (CAD) and chronic heart failure (CHF)-being responsible for exercise-induced myocardial ischemia in the former and increased afterload in the latter. In the last two decades exercise training has assumed a major role in both cardiovascular disorders. In ...
Lu Lu - - 2002
The cardiac sarcoplasmic reticulum calcium-ATPase (SERCA2a), Na+/Ca2+ exchanger (NCX1), and ryanodine receptor (RyR2) are proteins involved in the regulation of myocyte calcium. We tested whether exercise training (ET) alters those proteins during development of chronic heart failure (CHF). Ten dogs were chronically instrumented to permit hemodynamic measurements. Five dogs underwent ...
< 1 2 3 4 5 6 7 8 9 10 11 >