Search Results
Results 151 - 200 of 1545
1 2 3 4 5 6 7 8 9 10 >
Madias John E - - 2012
The interpretation of the electrocardiogram (ECG) T-wave alternans (TWA) as positive or negative depends on its magnitude, regardless whether the frequency domain or the time domain analysis is employed. The author argues that a number of cardiac and extracardiac influences can confound the magnitude of TWA. The amplitude of the ...
Itaya Hideki - - 2012
BACKGROUND: Circadian variation has been accepted as a factor in acute myocardial infarction (AMI). An increased incidence of cardiac events in the morning has been reported for a long time. Recent reports have indicated that the onset of AMI shows two peaks, which occur in the morning and evening. It ...
Kociol Robb D - - 2012
ST-segment elevation myocardial infarction (STEMI) treatment has improved outcomes and shortened hospital stay. Recently, 30-day readmission rates have been proposed as a metric for care of patients with STEMI. However, international rates and predictors of 30-day readmission after STEMI have not been studied. To determine international variation in and predictors ...
Tan Hong-Wei - - 2012
The success and complication rates of atrial fibrillation (AF) ablation may be related to regional differences in left atrial (LA) wall thickness. The purpose of this study was to investigate the transmural LA wall thickness in various regions. We measured LA wall thickness in 36 human heart specimens using calipers ...
Soares-Filho Gastão Luiz Fonseca - - 2012
Chest pain, a key element in the investigation of coronary artery disease is often regarded as a benign prognosis when present in panic attacks. However, panic disorder has been suggested as an independent risk factor for long-term prognosis of cardiovascular diseases and a trigger of acute myocardial infarction. Faced ...
Miśko Jolanta - - 2012
Evaluation of myocardial perfusion and viability in patients withstable coronary artery disease have now become the basicsource of information in qualification for revascularization oroptimal medical therapy. This article describes all the availablemethods of non-invasive imaging of myocardial perfusion andviability.
Kawel Nadine - - 2012
Myocardial T1 relaxation time (T1 time) and extracellular volume fraction (ECV) are altered in the presence of myocardial fibrosis. The purpose of this study was to evaluate acquisition factors that may result in variation of measured T1 time and ECV including magnetic field strength, cardiac phase and myocardial region. 31 ...
Kawel Nadine - - 2012
Myocardial T1 relaxation time (T1 time) and extracellular volume fraction (ECV) are altered in patients with diffuse myocardial fibrosis. The purpose of this study was to perform an intra-individual assessment of normal T1 time and ECV for two different contrast agents. A modified Look-Locker Inversion Recovery (MOLLI) sequence was acquired ...
Jia En-Zhi - - 2012
The objective of this study was to explore the time distribution patterns of the onset of chest pain in subjects with acute ST-elevation myocardial infarction in a Chinese population. A total of 1467 patients with acute ST-elevation myocardial infarction were enrolled from 2003 to 2010. The hourly, daily, monthly, seasonal ...
Young Alistair A - - 2012
Recently there has been considerable interest in LV torsion and its relationship with symptomatic and pre-symptomatic disease processes. Torsion gives useful additional information about myocardial tissue performance in both systolic and diastolic function. CMR assessment of LV torsion is simply and efficiently performed. However, there is currently a wide variation ...
Hsu Po-Chao - - 2012
Coronary collateral circulation plays an important role to protect myocardium from ischemia, preserve myocardial contractility and reduce cardiovascular events. Chronic kidney disease (CKD) is associated with poor coronary collateral development and cardiovascular outcome. However, limited research investigates the predictors for collateral development in the CKD population. We evaluated 970 consecutive ...
Kohr Mark J - - 2012
Peroxynitrite is a potent oxidant that is quickly emerging as a crucial modulator of myocardial function. This review will focus on the regulation of myocardial contraction by peroxynitrite during health and disease, with a specific emphasis on cardiomyocyte Ca(2+) handling, proposed signaling pathways, and protein end-targets.
Park Seung-Jung - - 2012
For several decades of medical history, coronary-artery bypass grafting (CABG) has been regarded as the best treatment option for patients with unprotected left main coronary artery (LMCA) disease, considering lesion priority and its clinical consequences. Over the time, with remarkable advancements in techniques of percutaneous coronary intervention (PCI), supporting devices, ...
Brandão Daniella Cunha - - 2011
Were evaluated individuals divided into two groups: we studied chronic heart failure (CHF) (19 patients with CHF plus cardiomegaly) and control (12 healthy volunteers) during performance of inspiratory loaded breathing (ILB). We evaluated: spirometry, functional capacity through the six-minute walk test (6MWT), and distribution of thoracoabdominal volumes via optoelectronic plethysmography ...
Nagele Peter - - 2011
Perioperative myocardial infarction is a common and potentially fatal complication after noncardiac surgery, particular among patients with cardiovascular risk factors. β-blockers have been considered a mainstay in prevention and treatment of perioperative myocardial infarction, yet recent evidence suggests that β-blockers may have an unfavorable risk profile in this setting, and ...
Ungerer Jacobus P J - - 2011
BACKGROUND:Data to standardize and harmonize the differences between cardiac troponin assays are needed to support their universal status in diagnosis of myocardial infarction. We characterized the variation between methods, the comparability of the 99th-percentile cutoff thresholds, and the occurrence of outliers in 4 cardiac troponin assays.METHODS:Cardiac troponin was measured in ...
Matyal Robina - - 2011
OBJECTIVES: To investigate the effects of acute elevation in afterload on global (systolic and diastolic) myocardial function by performing serial intraoperative transesophageal echocardiograms during and after cross-clamp application on patients undergoing elective abdominal aortic aneurysm (AAA) surgery. DESIGN: A prospective observational study. SETTING: A tertiary care university hospital. PARTICIPANTS: Patients ...
Perrault Louis P LP Department of Surgery, Montreal Heart Institute, University of Montréal, Montréal, Québec, - - 2012
Ischemic mitral regurgitation, a complication of myocardial infarction and coronary artery disease more generally, is associated with a high mortality rate and is estimated to affect 2.8 million Americans. With 1-year mortality rates as high as 40%, recent practice guidelines of professional societies recommend repair or replacement, but there remains ...
Phan T D - - 2011
This study compared the cardiac output responses to haemodynamic interventions as measured by three minimally invasive monitors (Oesophageal Doppler Monitor the VigileoFlotrac and the LiDCOrapid) to the responses measured concurrently using thermodilution, in cardiac surgical patients. The study also assessed the precision and bias of these monitors in relation to ...
Jones W Schuyler - - 2011
Although variation in use of invasive coronary procedures has been shown, the relationship between invasive diagnostic cardiac catheterization (Cath) and subsequent revascularization with percutaneous coronary intervention (PCI) or coronary artery bypass surgery (CABG) is not known. We evaluated the temporal trends and variation in invasive Cath, PCI, and CABG across ...
Ho Siew Yen - - 2011
The anatomy of the left atrium is reviewed with relevance to various interventional transcatheter procedures requiring manoeuvres within or passage through the left atrium. The component parts of the atrium-the atrial body with a vestibule, appendage, venous component, and the atrial septum-are described with emphasis on their spatial relationships to ...
Swenson Darrell J - - 2011
The electrocardiogram (ECG) is ubiquitously employed as a diagnostic and monitoring tool for patients experiencing cardiac distress and/or disease. It is widely known that changes in heart position resulting from, for example, posture of the patient (sitting, standing, lying) and respiration significantly affect the body-surface potentials; however, few studies have ...
Chen Chun-An - - 2011
Enzyme replacement therapy (ERT) for infantile-onset Pompe disease effectively reduces the left ventricular (LV) mass. This study sought to explore detailed process of LV reverse remodeling after ERT with the use of tissue Doppler and stain rate imaging. Nine infants and children with Pompe cardiomyopathy undergoing ERT for ≥1 year, ...
Gayat Etienne - - 2011
Most techniques previously used to assess left ventricular (LV) elastance (E(es)) and ventricular-arterial coupling (C(LV-A)) relied on invasive measurements and data acquisition over a wide range of loading conditions. Our goals were to: (1) assess the feasibility of noninvasive assessment of E(es) and C(LV-A) using real-time three-dimensional echocardiography (RT3DE) and ...
Christensen Jared D - - 2011
The purpose of this article is to assess whether iopamidol-370 provides superior vascular contrast of the coronaries and depiction of anatomic detail without affecting heart rate and beat-to-beat variability during coronary dual-source MDCT compared with iodixanol-320. In this prospective trial, coronary CT angiography was performed on 60 adult patients using ...
Zerbe Philipp - - 2011
Objective-To noninvasively evaluate physiologic postprandial adaptations of the heart in snakes. Animals-6 juvenile Paraguay anacondas (Eunectes notaeus). Procedures-The heart of each anaconda was echocardiographically evaluated after food was withheld for 28 days as well as 3 and 10 days after feeding. Physical measurements included body length, weight, and circumference at ...
Rolfes Christopher D - - 2011
Atrial fibrillation (AF) causes a continuum of atrial anatomical remodeling. Using a library of perfusion-fixed human hearts, specimens with AF were compared to controls. During this preliminary assessment study, direct measurements were taken of atrial volume, pulmonary vein (PV) circumference, and left atrial (LA) wall thicknesses. Hearts with AF typically ...
Katti Karuna - - 2011
Clinical cardiac procedures such as electrophysiology studies, catheter ablation of arrhythmias, retrograde cardioplegia delivery, cardiac resynchronization therapy and, more recently, percutaneous mitral annuloplasty, involve cannulation of the coronary sinus (CS). The presence of a membrane closing the orifice of the CS may cause difficulties during these interventions. Thus, detailed knowledge ...
Ahmad Talha J - - 2011
This paper discusses the effect of atrioventricular conduction time (AVCT) on the short-term Heart Rate Variability (HRV) by computing HRV parameters using intervals between the onsets of successive P waves (PP time series) for three groups: normal, arrhythmia and sudden cardiac death (SCD) patients. A very precise wavelet transform based ...
Eslami Abouzar - - 2011
In this paper we propose a new method for shape guided segmentation of cardiac boundaries based on manifold learning of the shapes represented by the phase field approximation of the Mumford-Shah functional. A novel distance is defined to measure the similarity of shapes without requiring deformable registration. Cardiac motion is ...
Ando Makoto - - 2011
BACKGROUND: Presently, there are wide variations in cardiac anatomies requiring single ventricular palliation and these variations may have an impact on the incidence of atrioventricular valve regurgitation. METHODS: In all, 363 patients underwent single ventricular palliation (1978 to 2008). Hearts were first classified into single right ventricle (156), single left ...
Chan Paul S PS Saint Luke's Mid America Heart and Vascular Institute, 4401 Wornall Rd, Fifth Floor, Kansas City, MO 64111, USA. - - 2011
Despite the widespread use of percutaneous coronary intervention (PCI), the appropriateness of these procedures in contemporary practice is unknown. To assess the appropriateness of PCI in the United States. Multicenter, prospective study of patients within the National Cardiovascular Data Registry undergoing PCI between July 1, 2009, and September 30, 2010, ...
Iqbal Toqueer - - 2011
Coronary artery diseases encompass a spectrum of disorders ranging from angina to fatal myocardial infarctions with the main underlying pathology being identified as atherosclerosis. The level of inflammatory markers, C-reactive protein and fibrinogen was determined in hundred patients with established coronary artery disease and correlated with lipid profile which included ...
Lloyd Christopher W - - 2011
Myocardial tissue characterization represents an extension of currently available echocardiographic imaging. The systematic variation of backscattered energy during the cardiac cycle (the "cyclic variation" of backscatter) has been employed to characterize cardiac function in a wide range of investigations. However, the mechanisms responsible for observed cyclic variation remain incompletely understood. ...
Karabag Turgut - - 2011
Background: Our aim was to investigate whether diastolic functions, myocardial velocities and pulmonary vein flow show diurnal variation within a 24-hour day. Method and Results: Fourty-four healthy subjects with no history of cardiovascular or systemic diseases (32 males, 12 females; mean age 34.7 ± 8.7 years, mean BMI: 25.5 ± ...
Kilbourne Barbara J - - 2011
: Coronary heart disease often presents with ST segment elevation acute myocardial infarction (STEMI). The American College of Cardiology/American Heart Association guidelines stress prompt reperfusion for STEMI. Examining geographic variations in treatment with PPCI (percutaneous primary coronary intervention) and CABG (coronary artery bypass graft) among metropolitan, micropolitan and non-micropolitan rural ...
Koplay Mustafa - - 2011
PURPOSE: The left atrial appendage (LAA) is usually known as a long, tubular, hooked structure derived from the left atrium. However, it varies widely in terms of anatomical shape. In this study, anatomical shape variations of the LAA were investigated and classified in vivo in a large group of patients ...
Becker Cristoph R - - 2011
OBJECTIVES:: To compare a contrast agent with high iodine concentration with an iso-osmolar contrast agent for coronary dual-source computed tomography angiography (DS-CTA), and to assess whether the contrast agent characteristics may affect the diagnostic quality of coronary DS-CTA. MATERIALS AND METHODS:: Patients were randomized to receive either 80 mL of ...
Goldfarb James W - - 2011
To evaluate the dependence of CINE-balanced steady-state free precession (bSSFP) image intensities on spatial location, cardiac phase, and disease state. Eight subjects with recent myocardial infarctions and eight age- and sex-matched normal volunteers were studied using CINE-bSSFP imaging to describe cyclic image intensity variations as a function of the cardiac ...
Boari Benedetta - - 2011
Congestive heart failure (CHF) is the end stage of many cardiac diseases, and one of the leading causes of mortality and morbidity around the world. Coronary heart disease and hypertension (either singly or together) are the main etiology for CHF. It has been reported that major acute cardiovascular events (myocardial ...
Hsiao Shih-Hung - - 2011
Although E/e' (the ratio of early diastolic mitral inflow velocity to early diastolic mitral annular velocity) is widely used to measure left ventricular filling pressure (LVFP), its accuracy is questionable in coronary artery disease patients. Echocardiograms and LVFP were obtained from 174 patients with stable angina (Canadian Cardiovascular Society angina ...
Kan Hirohito - - 2011
Apparent diffusion coefficients (ADCs) are sometimes overestimated when they are measured in the brain near the basal ganglia because water molecules in brain tissues fluctuate with blood volume loading in the cranium. We determined detailed ADC changes during the cardiac cycle to evaluate the appropriate cardiac phases for accurate measurement ...
Negassa Abdissa - - 2011
Objective. To identify modifiable neighborhood factors and quantify their effect on the rate of revascularization among acute myocardial infarction (AMI) patients. Method. Using the New York City hospital discharge records during 1998-2002, we employed a hierarchical regression model that integrates patient-level risk factors and neighborhood-level factors to retrospectively examine revascularization ...
Jiang He - - 2011
Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a kind of heart muscle disease characterized by the gradual replacement of the right ventricular myocardium with fibrous tissue and fat. It could be the major cause of sudden cardiac death with ventricular tachycardia, and there is a variation in the history of the ...
Bergenzaun Lill - - 2011
Assessing left ventricular (LV) systolic function in a rapid and reliable way can be challenging in the critically ill patient. The purpose of this study was to evaluate the feasibility and reliability of, as well as the association between, commonly used LV systolic parameters, by using serial transthoracic echocardiography (TTE). ...
Konings Maurits K - - 2011
Recently, a non-invasive, continuous ventricular stroke volume monitoring system using skin electrodes has been developed. In contrast to impedance-based methods, the new technique (ventricular field recognition) enables measurement of changes in ventricular volume. A prototype using this new method was built (the hemologic cardiac profiler, HCP) and validated against a ...
Lombardi Federico - - 2011
Heart period constantly changes on a beat to beat basis, due to autonomic influences on the sinoatrial node, and changes can be quantified as heart rate variability (HRV). In addition, after a premature ventricular beat, there are reproducible variations in RR interval, also due to baroreflex mediated autonomic influences on ...
Pennell Dudley J DJ Royal Brompton Hospital, London, UK. - - 2011
The efficacy of cardiac iron chelation in transfusion-dependent patients has been demonstrated in one-year prospective trials. Since normalization of cardiac T2* takes several years, the efficacy and safety of deferasirox was assessed for two years in patients with β-thalassemia major in the cardiac sub-study of the EPIC trial. Eligible patients ...
Komajda Michel - - 2011
The determinants of prognosis in patients with heart failure and preserved ejection fraction (HF-PEF) are poorly documented. We evaluated data from 4128 patients in the I-PRESERVE trial (Irbesartan in Heart Failure with Preserved Ejection Fraction Study). Multivariable Cox regression models were developed using 58 baseline demographic, clinical, and biological variables ...
McEvoy John W - - 2010
Baseline coronary artery calcification (CAC) accurately identifies coronary atherosclerosis and might improve prediction of future cardiac events. Serial assessment of CAC scores has been proposed for monitoring atherosclerosis progression and for assessing the effectiveness of medical therapies aimed at reducing cardiac risk. However, whether knowledge of progression of CAC scores ...
1 2 3 4 5 6 7 8 9 10 >