Abstract:
BACKGROUND:Myocardial contractility can be altered using voltage clamp techniques by modulating amplitude and duration of the action potential resulting in enhanced calcium entry in the cell of isolated muscle strips (Non-Excitatory Currents; NEC). Extracellular electrical stimuli delivered during the absolute refractory period (Cardiac Contractility Modulation; CCM) have recently been shown to produce inotropic effects in-vivo. AIM:Understanding the cellular mechanism, underlying the CCM effect, is essential for evaluating its clinical potential. We tested the hypothesis that NEC and CCM modulate contractility via similar cellular mechanisms. METHODS:Square wave electric currents were applied in the organ bath to isometrically contracting rabbit RV papillary muscle and human failing trabecular muscle during the absolute refractory period (ARP). RESULTS:These currents, which did not initiate new action potentials or contractions, modulated action potential duration (shortened or lengthened) and contractility (enhanced or depressed) in a manner that depended upon their amplitude, duration and delay from the pacing stimulus. The contractility modulation effect in the rabbit RV papillary muscle was markedly blunted after exposure to ryanodine, indicating that the sarcoplasmic reticulum plays an important role in the contractility modulation. CONCLUSION:Like voltage clamping, extracellular currents applied during the ARP can similarly modulate action potential duration in-vitro and modulate myocardial contractility by similar intracellular mechanisms. This concept provides the potential of a therapeutic strategy in patients with heart failure to enhance contractility.
journal_name
Eur J Heart Failjournal_title
European journal of heart failureauthors
Brunckhorst CB,Shemer I,Mika Y,Ben-Haim SA,Burkhoff Ddoi
10.1016/j.ejheart.2005.05.011keywords:
subject
Has Abstractpub_date
2006-01-01 00:00:00pages
7-15issue
1eissn
1388-9842issn
1879-0844pii
S1388-9842(05)00134-0journal_volume
8pub_type
杂志文章abstract::It is well known that atrial fibrillation can lead to heart failure, and is attributed to rapid ventricular rate (tachycardia-induced cardiomyopathy). Some recent studies suggest the possible existence of an intrinsic left-ventricular factor related to atrial fibrillation, irrespective of other elements. In order to d...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1016/s1388-9842(02)00004-1
更新日期:2002-06-01 00:00:00
abstract:AIMS:The MITRA-FR trial showed that among symptomatic patients with severe secondary mitral regurgitation, percutaneous repair did not reduce the risk of death or hospitalization for heart failure at 12 months compared with guideline-directed medical treatment alone. We report the 24-month outcome from this trial. MET...
journal_title:European journal of heart failure
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1002/ejhf.1616
更新日期:2019-12-01 00:00:00
abstract:AIMS:Beta-blockers (BBs) improve outcomes in heart failure. Results from the Cardiac Insufficiency Bisoprolol Study in Elderly (CIBIS-ELD) trial previously demonstrated the feasibility of heart rate, not maximum dose, as a treatment goal. In this pre-specified analysis, we investigated the prognostic value of achieved ...
journal_title:European journal of heart failure
pub_type: 杂志文章,随机对照试验
doi:10.1002/ejhf.121
更新日期:2014-08-01 00:00:00
abstract:AIMS:Plasma N-terminal pro-brain natriuretic peptide (NT-proBNP) is a strong biochemical marker of heart failure and left ventricular dysfunction (LVD). Due to renal arterio-venous clearance of NT-proBNP and the correlation of plasma concentrations with renal function, we hypothesized that NT-proBNP may have potential ...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1093/eurjhf/hfq016
更新日期:2010-04-01 00:00:00
abstract:BACKGROUND:Knowledge on clinical characteristics and prognosis of patients with heart failure originates from studies of selected populations in clinical trials or from epidemiological observations. Reports on the large numbers of patients with heart failure treated in community hospitals are sparse. OBJECTIVE:Are the...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1016/s1388-9842(01)00142-8
更新日期:2001-10-01 00:00:00
abstract:AIM:Heart failure with preserved ejection fraction (HFpEF) is associated with increased sympathetic nervous system (SNS) tone. Attenuating the SNS with renal denervation (RDT) might be helpful and there are no data currently in humans with HFpEF. METHODS AND RESULTS:In this single-centre, randomized, open-controlled s...
journal_title:European journal of heart failure
pub_type: 杂志文章,随机对照试验
doi:10.1002/ejhf.502
更新日期:2016-06-01 00:00:00
abstract:AIMS:Patients with acute heart failure (HF) in Africa are rarely being treated with a hydralazine/nitrates combination. Therefore the effect of this treatment was studied here. METHODS AND RESULTS:The study was planned to enrol 500 patients during an acute HF admission, from nine sub-Saharan African countries. Patient...
journal_title:European journal of heart failure
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1002/ejhf.581
更新日期:2016-10-01 00:00:00
abstract:BACKGROUND:The relationship between quality of life (QoL) and survival have been poorly investigated. The aim of this study was to determine the value of QoL score as a prognostic factor in a prospective cohort of patients with advanced chronic heart failure (CHF). METHODS:QoL assessment was performed with a generic q...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1016/s1388-9842(02)00006-5
更新日期:2002-06-01 00:00:00
abstract::COMBAT is a prospective, multicenter, randomized, blinded clinical study, with crossover design. The main objective is the comparative evaluation of atrio-biventricular versus conventional atrioventricular stimulation (atrio and right ventricle) in patients with heart failure and bradycardia as the primary indication ...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1016/j.ejheart.2004.06.008
更新日期:2005-03-02 00:00:00
abstract:BACKGROUND:The development of heart failure after acute myocardial infarction (AMI) has been shown to be associated with inflammation, which is positively and negatively regulated by T helper (Th) 1 and Th2 lymphocytes, respectively. Several studies have indicated that statins can improve heart function after AMI. AIM...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1016/j.ejheart.2005.01.020
更新日期:2005-12-01 00:00:00
abstract:AIMS:To investigate temporal trends in the risk of heart failure (HF) complicating acute myocardial infarction (AMI) and to determine whether these trends differ by gender or age. METHODS AND RESULTS:The national Swedish hospital discharge and death registries from 1993 to 2004 were used to calculate age- and gender-s...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1093/eurjhf/hfq205
更新日期:2011-02-01 00:00:00
abstract::Alternations in gut microbial composition (i.e. loss of microbial diversity or 'gut dysbiosis') have been associated with heart failure with reduced ejection fraction (HFrEF). It has also been suggested that increased chronic low-level inflammation and immune system dysregulation seen in patients with HFrEF could be r...
journal_title:European journal of heart failure
pub_type: 杂志文章,评审
doi:10.1002/ejhf.1792
更新日期:2020-04-01 00:00:00
abstract:AIMS:Knowledge of patient preferences is vital for delivering optimal healthcare. This study uses utility measurement to assess the preferences of heart failure (HF) patients regarding quality of life or longevity. The utility approach represents the perspective of a patient; facilitates the combination of mortality, m...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1093/eurjhf/hft071
更新日期:2013-10-01 00:00:00
abstract:AIMS:We evaluated the applicability and prognostic importance of oral glucose tolerance testing (OGTT) among outpatients with systolic heart failure (SHF). METHODS AND RESULTS:Consecutive patients with SHF and left ventricular ejection fraction (LVEF) ≤ 45% referred to a heart failure clinic (n= 413) were included in ...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1093/eurjhf/hfq216
更新日期:2011-03-01 00:00:00
abstract:AIMS:Angiotensin receptor-neprilysin inhibitors (ARNis) acts an ARB and neprilysin inhibitor. Diabetes mellitus significantly increases the risk of cardiovascular disease and heart failure (HF). Therefore, we evaluated the effects and mechanisms of ARNi in HF with reduced ejection fraction (HFrEF) in streptozotocin-ind...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1002/ejhf.474
更新日期:2016-04-01 00:00:00
abstract:AIMS:To investigate the annual hospitalization rate and seasonal variation in confirmed heart failure (HF) admissions. METHODS AND RESULTS:Records from all admissions to one hospital during 1 year with a HF diagnostic code were reviewed. From 1953 admissions, 595 were excluded because they did not fulfill the diagnost...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1016/s1388-9842(02)00116-2
更新日期:2002-12-01 00:00:00
abstract:INTRODUCTION:Atrial fibrillation (AF) is common in patients with heart failure (HF) due to left ventricular systolic dysfunction (LVSD), with conflicting prognostic data. The aim of our study was to assess the prevalence and incidence of AF in patients with HF and to determine the prognostic impact of baseline AF and t...
journal_title:European journal of heart failure
pub_type: 杂志文章,多中心研究
doi:10.1016/j.ejheart.2006.08.004
更新日期:2007-03-01 00:00:00
abstract::The Elecsys NT-proBNP assay is based on two polyclonal antibodies directed at residues 1-21 and 39-50 of the NT-proBNP molecule. Analytical performance was assessed using NCCLS protocol EP-5A using three serum pools in a preliminary study then as part of a multicentre evaluation (16 instruments in 8 hospitals). Using ...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1016/j.ejheart.2004.01.011
更新日期:2004-03-15 00:00:00
abstract:AIMS:Post-discharge morbidity and mortality for acute heart failure (AHF) patients remains high. Although the adverse effects of neurohormonal activation are well known in chronic HF, the prognostic significance of serum aldosterone in patients hospitalized for AHF has not been well studied. METHODS AND RESULTS:A seco...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1093/eurjhf/hft100
更新日期:2013-11-01 00:00:00
abstract:AIMS:Urine proteome analysis (UPA) has already provided accurate discriminatory patterns of urinary peptides for renal disease, coronary artery disease, and asymptomatic LV diastolic dysfunction. UPA has now been used to characterize a discriminatory peptide biomarker pattern and establish a diagnostic classifier for h...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1002/ejhf.544
更新日期:2016-07-01 00:00:00
abstract:AIMS:The aim of this review is to assess the effects of exercise training on the symptoms of depression in heart failure (HF) patients. METHODS AND RESULTS:Randomized controlled trials of exercise training in patients with HF and symptoms of depression were identified. The depression data were pooled using meta-analys...
journal_title:European journal of heart failure
pub_type: 杂志文章,meta分析,评审
doi:10.1002/ejhf.101
更新日期:2014-07-01 00:00:00
abstract:OBJECTIVES:Regional presynaptic sympathetic innervation varies considerably in the cardiomyopathic human heart, as shown in previous studies in vivo and in vitro. The goal of the present study was to correlate markers of presynaptic sympathetic innervation with local measurement of the postsynaptic beta-adrenergic syst...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1016/s1388-9842(99)00072-0
更新日期:2000-03-01 00:00:00
abstract:AIM:Mineralocorticoid receptor antagonists (MRAs) improve outcomes in heart failure with reduced ejection fraction (HFrEF), but are underutilized. Hyperkalaemia may be one reason, but the underlying reasons for underuse are unknown. The aim of this study was to investigate the independent predictors of MRA underuse in ...
journal_title:European journal of heart failure
pub_type: 杂志文章,多中心研究,评审
doi:10.1002/ejhf.1182
更新日期:2018-09-01 00:00:00
abstract:AIMS:Undetected atrial fibrillation (AF) may be common in the heart failure with preserved ejection fraction (HFpEF) population, and failure to detect this may lead to the missing of opportunities to prevent associated subclinical cerebral infarctions (SCIs) and cognitive decline. METHODS AND RESULTS:We studied 1527 p...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1002/ejhf.812
更新日期:2017-10-01 00:00:00
abstract:BACKGROUND:Carvedilol improves left ventricular (LV) function when heart failure is due to LV systolic dysfunction, but the magnitude of the response is heterogeneous among patients with coronary disease, possibly reflecting the presence or volume of hibernating myocardium. AIMS:The primary objective of the study is t...
journal_title:European journal of heart failure
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1016/s1388-9842(99)00024-0
更新日期:1999-06-01 00:00:00
abstract::Most treatments for chronic heart failure are effective both in preventing its onset and reducing its progression. However, statins prevent the development of heart failure, but they do not decrease morbidity and mortality in those with established heart failure. This apparent discordance cannot be explained by an eff...
journal_title:European journal of heart failure
pub_type: 杂志文章,评审
doi:10.1002/ejhf.1183
更新日期:2018-07-01 00:00:00
abstract:BACKGROUND:Information about the occurrence of heart failure in the acute phase of myocardial infarction (MI) in diabetic patients and its impact on prognosis are sparse. AIM:The purpose of the present study was to describe how MI patients with diabetes mellitus (DM) differed from MI patients without DM with respect t...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1016/s1388-9842(00)00117-3
更新日期:2001-01-01 00:00:00
abstract:AIMS:Oral sucrosomial iron (SI) combines enhanced bioavailability and tolerance compared to conventional oral iron along with similar efficacy compared to intravenous iron in several conditions associated with iron deficiency (ID). METHODS AND RESULTS:In this non-randomized, open-label study, we sought to evaluate pro...
journal_title:European journal of heart failure
pub_type: 杂志文章
doi:10.1002/ejhf.2092
更新日期:2021-01-09 00:00:00
abstract:BACKGROUND:Biventricular (BiV) pacing has been found to improve systolic function and exercise tolerance in patients with severe congestive heart failure and bundle branch block. The mechanisms behind this beneficial effect is still not sufficiently clarified. AIM:To evaluate the regional myocardial perfusion (MP) dur...
journal_title:European journal of heart failure
pub_type: 杂志文章,多中心研究
doi:10.1016/s1388-9842(02)00245-3
更新日期:2003-03-01 00:00:00
abstract::Impaired cardiac function is frequently accompanied by peripheral vascular dysfunction and a pro-inflammatory condition, which may be associated with elevated levels of angiotensin II. We hypothesized that the magnitude of flow mediated dilatation (FMD) of the brachial artery of post myocardial infarction patients wil...
journal_title:European journal of heart failure
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.ejheart.2005.10.011
更新日期:2006-08-01 00:00:00