Search Results
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Pauliks Linda B - - 2008
The noninvasive assessment of cardiac function during mechanical circulatory support is challenging because conventional markers (like ejection fraction) are significantly load-dependent. Yet loading conditions are abnormal and change during support and weaning process. Tissue Doppler and strain rate imaging are echocardiographic techniques that permit quantitation of regional wall motion. Peak ...
Leonardi Benedetta - - 2008
OBJECTIVES: We sought to evaluate whether echocardiographic diastolic function indices correlate with myocardial iron and systolic function in patients with transfusion-dependent thalassemia (TDT) who are at risk for cardiomyopathy. BACKGROUND: In thalassemia syndromes, there is an important clinical need to risk stratify patients for the development of iron-overload cardiomyopathy so ...
Kittipovanonth Maytinee - - 2008
BACKGROUND: In pulmonary hypertension (PHT), right ventricular (RV) function affects treatment strategy and prognosis. Doppler myocardial imaging (DMI) has the potential to detect early RV dysfunction. METHODS: Regional RV function was prospectively assessed in 110 patients without primary structural heart disease, including patients with known PHT (group I; n = ...
Schumacher A - - 2008
Most patients with cardiac disease have diastolic dysfunction which is characterized by impaired diastolic filling and/or abnormal diastolic relaxation. The trans-esophageal echocardiography (TEE) used routinely during open-heart surgical procedures has exceptional resolution that may permit the identification and grading of diastolic dysfunction. The goal of this study was to determine ...
Tsioufis Costas - - 2008
BACKGROUND: Primary aldosteronism (PA) has been experimentally and clinically linked to myocardial and vascular fibrosis, and it has been further associated with left ventricular (LV) structural adaptations. HYPOTHESIS: Functional cardiovascular adaptations in hypertensive patients with PA precede structural alterations in the early stages of the disease. METHODS: We studied 17 ...
Tayyareci Yelda - - 2008
OBJECTIVES: Although right ventricular (RV) systolic dysfunction is an important indicator for the severity of mitral stenosis (MS), its diagnosis is difficult before systemic signs of venous congestion occur. We assessed the association between tissue Doppler (TDI)-derived isovolumic myocardial acceleration (IVA) and the severity of MS. STUDY DESIGN: The study ...
Haraldsson Henrik - - 2008
PURPOSE: To estimate regional myocardial strain rate, with reduced sensitivity to noise and velocities outside the region of interest, and provide a visualization of the spatial variation of the obtained tensor field within the myocardium. MATERIALS AND METHODS: Myocardial velocities were measured using two-dimensional phase contrast velocity mapping. Velocity gradients ...
Dogan Abdullah - - 2009
OBJECTIVE: Atrial and/or appendage stunning (AS) usually occur after successful cardioversion of atrial fibrillation (AF). Several parameters except mitral annular velocity were previously evaluated to determine AS. We investigated whether mitral annular velocity was useful for determining of AS. METHODS: This study consisted of 52 consecutive patients with AF <3 ...
Ishizu Tomoko - - 2008
We evaluated diastolic functional reserve in 108 patients with normal left ventricular ejection fraction (LVEF)> or =50% but abnormal relaxation (ratio of transmitral peak velocity of early and late diastolic flow (E/A)<1) using passive leg lifting. We calculated the pulmonary venous systolic to diastolic flow ratio (S/D) as a marker ...
Wu Weichun - - 2008
BACKGROUND: The authors assessed the capability of quantitative tissue velocity imaging (QTVI) to detect left ventricular (LV) early diastolic dysfunction (LVEDDY) in a canine model. METHODS: Rapid ventricular pacing (RVP) at 240 beats/min was maintained in 14 dogs for 2 weeks. Echocardiography, cardiac catheterization, and endomyocardial biopsies were performed at ...
Ramzy Ihab S - - 2009
AIM: To assess right ventricular (RV) function in patients with inferior myocardial infarction (IMI) and to observe changes following thrombolysis. BACKGROUND: RV dysfunction occurs in 30% of patients with IMI. The extent of such involvement and its potential, recovery has not been determined. METHODS: We studied 30 patients with acute ...
Fayssoil Abdallah - - 2009
Mice allow biologists to study various genes playing a role in cardiac function and pathophysiological situations. Echocardiography is a non-invasive tool for assessing cardiac phenotype. Because of load dependence of conventional parameters (left ventricular shortening fraction, left ventricular ejection fraction and mitral pulsed Doppler), we have to perform Doppler tissular ...
Loureiro J - - 2008
OBJECTIVE: The aims of this study were (i) to evaluate echocardiographic findings and myocardial function including pulsed wave tissue Doppler imaging in dogs with naturally occurring dynamic left ventricular outflow tract obstruction and (ii) to investigate the clinical outcome and response to therapy in these dogs. METHODS: Two cases were ...
Choi Jin-Oh - - 2008
BACKGROUND: In this study, we evaluated the feasibility and clinical usefulness of TS(E-E(') ), the time interval between the onsets of early diastolic mitral inflow velocity (E) and mitral annular velocity (E'), obtained by simultaneously tracing E and E', in terms of evaluating diastolic function. METHODS: By the diastolic functional ...
Ballo Piercarlo - - 2008
BACKGROUND: To explore the prognostic value of left ventricular (LV) longitudinal systolic dysfunction in patients with hypertension. METHODS: In 156 hypertensive subjects, LV longitudinal systolic function was assessed by echocardiographic measurement of M-mode left atrioventricular plane displacement (AVPD) and Tissue Doppler (TD)-derived mitral annulus peak systolic velocity (Sm). Patients were ...
Ng Arnold C T - - 2008
Myocardial velocities have prognostic implications, and transmitral E wave to mitral annular early diastolic tissue velocity ratio (E/Em) is utilized to estimate left ventricular (LV) end-diastolic pressure (EDP). There are no reference values for 2-dimensional (2D) speckle tracking myocardial velocities (S2D, E2D, A2D), and it is unknown if they are ...
Kim Woo-Shik - - 2008
To evaluate intramyocardial coronary flow velocity pattern by transthoracic Doppler echocardiography and its clinical significance in patients with hypertrophic cardiomyopathy (HCM). In 48 patients with HCM who had angiographically normal coronary artery, coronary flow velocity in the left anterior descending coronary artery (LAD) and intramyocardial coronary artery (IMCA) derived from ...
Gulel Okan - - 2008
BACKGROUND: Cardiovascular diseases are responsible for about half of deaths and are the major cause of mortality in hemodialysis patients. The aim of this study is to assess left ventricular (LV) longitudinal myocardial functions by color tissue Doppler imaging (TDI) in patients with chronic renal failure on a regular hemodialysis ...
Almeida Ana G - - 2008
BACKGROUND: Sickle cell disease (SCD) is characterized by obstruction of microvessels leading to ischemia and necrosis. We have aimed to demonstrate whether myocardial contrast echocardiography (MCE) is able to detect myocardial perfusion abnormalities in SCD patients and to assess their relationship with left ventricle (LV) perfusion and systolic function. METHODS: ...
Friedberg Mark K - - 2008
BACKGROUND: We investigated diastolic mechanical dyssynchrony and its relation to clinical status in pediatric dilated cardiomyopathy (DCM). METHODS AND RESULTS: We calculated a diastolic and systolic dyssynchrony index (standard deviation of time to peak tissue early diastolic/systolic velocity in 12 left ventricular segments) in 33 children with DCM and 46 ...
Koffas H - - 2008
OBJECTIVES: To determine whether decreased diastolic and systolic myocardial velocity gradient between the endocardium and the epicardium exist in the left ventricle of cats with hypertrophic cardiomyopathy. METHODS: Myocardial velocity gradient and mean myocardial velocities were measured by colour M-mode tissue Doppler imaging in the left ventricular free wall of ...
Hubbert Laila - - 2008
The aim of this study was to investigate flow characteristics and myocardial function after implantation of an axial pump left ventricular assist device while varying afterload and during progressive myocardial depression. Ten calves were included, seven of which fulfilled the protocol. Invasive hemodynamic monitoring and echocardiography with color-coded systolic tissue ...
Amoozgar Hamid - - 2008
Doppler tissue imaging (DTI) has been proposed as a tool for evaluation of diastolic function. Controversy exists regarding whether DTI measurements are influenced by preload. To determine the influence of preload reduction on DTI, we studied 17 patients (mean age 17 +/- 1.82 years) with end-stage renal disease and without ...
Esmaeilzadeh Maryam - - 2009
AIMS: Enhanced external counter pulsation (EECP) is a non-invasive and non-pharmacological therapy for patients with symptomatic coronary artery disease (CAD). There are, however, insufficient data to support the effectiveness of EECP in improving the myocardial mechanical properties of patients with refractory stable angina. We aimed to assess the effects of ...
Hirsch Alexander - - 2008
OBJECTIVES: We studied the relation between presence and severity of microvascular obstruction (MO), measured by cardiovascular magnetic resonance (CMR) and intracoronary Doppler flow measurements, for assessment of myocardial reperfusion in patients with acute anterior myocardial infarction (MI) treated by primary percutaneous coronary intervention (PCI). BACKGROUND: Cardiovascular magnetic resonance has been ...
Bahtiyar Mert Ozan - - 2008
Intrauterine growth restriction (IUGR), which complicates approximately 3% to 10% of all pregnancies leads to preferential hemodynamic changes in affected fetuses. Advanced ultrasound modalities allow reliable and reproducible assessment of the intrauterine fetal cardiac function. Among other methods, combined cardiac output, individual ventricular ejection forces, E/A ratio, and Tei index ...
Nelson O Lynne - - 2008
The hibernation phenomenon captures biological as well as clinical interests to understand how organs adapt. Here we studied how hibernating grizzly bears (Ursus arctos horribilis) tolerate extremely low heart rates without developing cardiac chamber dilation. We evaluated cardiac filling function in unanesthetized grizzly bears by echocardiography during the active and ...
van der Meer Rutger W - - 2008
AIMS: In animal models of obesity and diabetes mellitus, myocardial TG accumulation is associated with decreased myocardial function. In the physiologically ageing heart, myocardial triglyceride (TG) accumulation may also occur due to reduced myocardial fatty acid oxidation. The role of myocardial TG in the ageing human heart is unknown. Therefore, ...
Miyazaki Chinami - - 2008
BACKGROUND: Several echocardiographic dyssynchrony indexes have been proposed to identify responders to cardiac resynchronization therapy using tissue velocity and strain. The present study aimed to compare tissue velocity-derived and strain-derived dyssynchrony indexes in patients with or without systolic dysfunction and left bundle-branch block. METHODS AND RESULTS: Tissue Doppler imaging was ...
King G J - - 2008
BACKGROUND: In elite athletes left ventricular (LV) morphological changes are predicted to alter passive pressure/volume characteristics by reducing myocardial stiffness and increasing compliance. OBJECTIVE: To investigate the utility of a new Doppler tissue index based on the pressure volume relation ((E/Ea)/LVEDD), which provides a measure of myocardial stiffness, and to ...
Tousignant Claude P - - 2008
OBJECTIVES: Tricuspid annular isovolumic acceleration is a load-independent measure of contractility, but its relationship to heart rate is unknown in humans. The authors investigated the effect of heart rate on measurements of isovolumic acceleration and systolic wave velocities in postoperative cardiac surgical patients with atrial fibrillation. DESIGN: This was a ...
Simpson Kerry E - - 2008
The identification and assessment of myocardial failure in canine idiopathic dilated cardiomyopathy (DCM) is achieved using a variety of two-dimensional and Doppler echocardiographic techniques. More recently, the availability of tissue Doppler imaging (TDI) has raised the potential for development of new ways of more accurately identifying a disease phenotype. Nevertheless, ...
Duan Yuqing - - 2008
The aim was to compare the right ventricular (RV) Tei index obtained by the tissue Doppler imaging (TDI) method with that obtained by the pulsed Doppler method in 29 fetuses aged 24-39 weeks (29.9 +/- 4.0 weeks). From pulsed Doppler recordings, the tricuspid closing-to-opening time (a) and RV ejection time ...
Fontes-Sousa Ana Patrícia - - 2009
Limited data are available on the use of more recent echocardiographic parameters in the rabbit. Echocardiographic examination, including conventional echocardiography and tissue Doppler imaging (TDI), was performed on 26 male New Zealand white rabbits under ketamine-midazolam sedation. Particular emphasis was placed on the more recent systolic and diastolic parameters, such ...
Arnold Raoul - - 2008
BACKGROUND: Ventricular dysfunction represents one of the major problems in the long-term follow-up of patients after atrial repair for dextrotransposition of the great arteries. We aimed to study the role of tissue Doppler derived isovolumic acceleration (IVA) to detect early myocardial dysfunction in these patients. METHODS: Twenty-four patients with dextrotransposition ...
Rajagopalan Navin - - 2008
OBJECTIVES: The objective of this study was to correlate tissue Doppler imaging of the right ventricle (RV) with pulmonary hemodynamics in patients referred for right heart catheterization. METHODS: Seventy subjects (mean age 54 +/- 13; 35 males) prospectively underwent tissue Doppler imaging of the RV and right heart catheterization within ...
Ganame Javier - - 2008
AIMS: Hypertrophic cardiomyopathy (HCM) is a disease with a heterogeneous clinical and morphological presentation. It can be secondary to mutations in genes encoding for sarcomeric and non-sarcomeric proteins. The pattern of ventricular hypertrophy can vary from isolated basal septal to concentric hypertrophy. We investigated if there are differences in regional ...
Zywica K - - 2008
AIMS: In patients without hypertrophic obstructive cardiomyopathy (HOCM), dynamic left ventricular outflow tract obstruction (DLVOTO) can cause ischaemia. Little is known about incidence and predictors of DLVOTO in patients without HOCM. METHODS AND RESULTS: In 300 patients referred for exercise echocardiography, assessment of DLVOTO at rest and with Valsalva and ...
Dobbe J G G - - 2008
This study describes a new method for analyzing microcirculatory videos. It introduces algorithms for quantitative assessment of vessel length, diameter, the functional microcirculatory density distribution and red blood-cell (RBC) velocity in individual vessels as well as its distribution. The technique was validated and compared to commercial software. The method was ...
Perry Rebecca - - 2008
AIMS: To determine whether the degree of untwisting of the apex in early diastole is related to established parameters of diastolic function. METHODS AND RESULTS: Data from 71 hospital inpatients with preserved left ventricular systolic function who underwent standard two-dimensional echocardiography was analysed using an off-line speckle tracking software package. ...
Baumann Patricia Q - - 2008
Gender-dependent differences in echocardiographic characteristics of the heart have been thought to exist in human subjects, but comparisons have been difficult because of potential confounders such as differential prevalence of occult disease. Little data are available characterizing echocardiographic descriptors in normal experimental animals despite wide use of this modality. Accordingly, ...
Mertens Luc - - 2008
BACKGROUND: In young patients (aged <12 years) with Duchenne muscular dystrophy (DMD), cardiac systolic function is generally described to be within the normal range. Recent studies have suggested the presence of subclinical dysfunction in these young patients using cardiac magnetic resonance imaging, tissue Doppler measurements, and myocardial velocity gradients. The ...
Barbieri Andrea - - 2008
BACKGROUND: After acute myocardial infarction (MI) the severity of diastolic dysfunction by echocardiography represents an independent prognostic marker. However, the mechanisms whereby diastolic dysfunction portends an increased risk after MI are not fully understood. We investigated the relationship between echocardiographic diastolic dysfunction severity and infarct size quantitatively measured by contrast-enhanced ...
Bazaz Raveen - - 2008
BACKGROUND: Extensive data exist regarding annular descent and ventricular function. We have already demonstrated significant differences in amplitude and timing of events between maximal mitral (MAPSE) and tricuspid (TAPSE) annular plane systolic excursion as well as described quantitative temporal differences in annular ascent (AA) between the right and left sides ...
Abd El-Aziz Tarek A - - 2008
Age alters Doppler indexes of left ventricular diastolic performance. Thus, the Doppler detection of left ventricular diastolic dysfunction in the elderly is difficult. The reliability of Doppler indexes in detecting left ventricular diastolic dysfunction in the elderly patients with cardiac diseases known to affect diastolic function were evaluated. Diastolic function ...
Barutcu Irfan - - 2008
Acute effects of smoking on left and right ventricular function is determined by conventional and tissue Doppler imaging methods in this study. Pulsed-wave Doppler indices of the left and right ventricle diastolic function, including mitral and tricuspid inflow peak early and late velocity and their ratio were obtained from 20 ...
Saglam Mustafa - - 2008
The authors sought to determine left ventricular functions by conventional and tissue Doppler imaging in patients with isolated coronary artery ectasia and controls. Peak early (E) and late (A) mitral inflow velocity, E/A ratio, E deceleration time, and isovolumetric relaxation time were obtained. Peak systolic velocity (Sm), diastolic early (Em), ...
Shim Chi Young - - 2008
The aim of this study was to address whether albuminuria could predict myocardial dysfunction in diabetic patients without overt heart disease. We studied 67 patients with normal left ventricular (LV) ejection fraction and no evidence of LV hypertrophy or coronary artery disease (47 patients with type 2 diabetes mellitus and ...
Tavil Yusuf - - 2008
OBJECTIVE: Hyperuricemia (HU) is a well-recognized risk factor for cardiovascular diseases. The independence of this association from other confounding factors has remained controversial. The possible contributory effect of HU to myocardial impairment produced by hypertension (HT), however, has not been clarified yet. The study was designed to assess the left ...
Drighil Abdenasser - - 2008
AIMS: Mitral stenosis (MS) affects right ventricular (RV) function as a result of myocardial and haemodynamic factors. Although the long-term effects of mitral commissurotomy are well known, the aim of this study was to evaluate the immediate impact of percutaneous mitral commissurotomy (PTMC) on RV function in patients with MS. ...
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