Search Results
Results 451 - 500 of 1667
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O'Neill James O - - 2004
BACKGROUND: The abnormalities in dilated cardiomyopathy (DCM) are generally considered diffuse and to affect the left ventricle in a global manner. However, regional wall motion abnormalities and metabolic defects may also occur to varying, but unclear degrees. QRS width and metabolic defects on positron emission tomography (PET) correlate with survival. ...
Emilsson Kent - - 2004
OBJECTIVE: To compare echocardiographic M-mode measurements of tricuspid annulus motion (TAM) with angiographic M-mode measurements of right coronary artery motion (RAM). DESIGN: Twenty-four patients were included and examined by echocardiography before the angiographic examination. The amplitudes and the velocities of TAM and the atrial contribution to the total amplitude of ...
Mele Donato - - 2004
Doppler tissue imaging (DTI) can measure myocardial velocities but velocities alone cannot distinguish active from passive wall motion, whereas this is possible by strain rate (SR) imaging (SRI). We evaluated the accuracy of SRI for recognition of abnormal regional systolic function compared with DTI, B-mode echocardiography, and anatomic M-mode in ...
Ro Thomas K - - 2004
Acute pancreatitis has frequently been reported to be associated with transient electrocardiography changes mimicking myocardial infarction despite normal epicardial coronary arteries. Although these reports generally have not included simultaneous assessment of myocardial function, 1 previous report has documented suggestive electrocardiography changes associated with a transient regional wall-motion abnormality but normal ...
Voigt J-U - - 2004
Strain (deformation) and strain rate (velocity of deformation) are parameters of regional myocardial function which can be calculated at the bedside from tissue Doppler echocardiographic data. These parameters are less image quality dependent and less subjective than visual assessment of endocardial border motion, and they track myocardial deformation with a ...
Ferencik Maros - - 2004
We systematically studied the thickness of the myocardium in the left ventricular apical region in patients without a history of myocardial infarction and with no hemodynamically significant coronary artery disease, using contrast-enhanced multidetector spiral computed tomography with submillimeter collimation. We confirmed previous pathology data and reliably detected a small confined ...
Tardif Jean-Claude - - 2004
OBJECTIVE: To evaluate the effects of inhibition of the Na+/H+ exchanger (NHE) on regional left ventricular dysfunction in patients with a non-ST elevation acute coronary syndrome (ACS) BACKGROUND: NHE inhibition protects against myocardial necrosis and stunning in ischemia-reperfusion models. METHODS AND RESULTS: In a substudy of the GUARd During Ischemia ...
Moustakidis Pavlos - - 2004
BACKGROUND: Coronary artery disease characteristically impacts left ventricular (LV) function on a regional basis, although ultimately global function may be affected as well. Echocardiography is commonly clinically used for the assessment of regional function; however, it is only semiquantitative and in its current iteration is only two-dimensional in nature. Magnetic ...
Candell-Riera Jaume - - 2004
BACKGROUND: The relationship between the visual scores for wall motion (WM) and wall thickening (WT) of different left ventricular regions in patients with anterior and infero-lateral myocardial infarctions was evaluated using gated SPECT. METHODS: Ninety consecutive patients (79 men and 11 women; mean age 56 +/- 9 years) with previous ...
Zwanenburg J J M - - 2004
Mechanical asynchrony is an important parameter in predicting the response to cardiac resynchronization therapy, but detailed knowledge of cardiac contraction timing in healthy persons is scarce. In this work, timing of cardiac contraction was mapped in 17 healthy subjects with high-temporal-resolution (14 ms) MRI myocardial tagging and strain analysis. Both ...
Cozma D - - 2004
The aim of the study was to assess if echographic ventricular desynchronization parameters measured in patients with dilated cardiomyopathy (DCM) and severe heart failure are correlated with the duration of the QRS on surface electrocardiogram. METHODS: This study included 51 pts aged 58.8 +/- 7.4 years with idiopathic DCM. The ...
Lembcke Alexander - - 2004
OBJECTIVE: To verify changes in left ventricular (LV) volumes and regional myocardial wall motion after implantation of a textile cardiac support device (CSD) for passive external constraint in non-ischemic dilated cardiomyopathy. METHODS: In nine male patients participating in a non-randomized clinical trial LV volumes were determined and the segmental LV ...
Sievers Burkhard - - 2004
AIM: To evaluate right ventricular wall motion abnormalities in healthy subjects using a new segmental model for the right ventricle. METHODS AND RESULTS: 29 healthy subjects (9 female, 20 male, mean age 48.9+/-15 years) underwent cardiovascular magnetic resonance imaging (CMR; 1.5-Tesla Sonata, Siemens, Erlangen, Germany) for the evaluation of cardiac ...
Calafiore Antonio Maria - - 2004
BACKGROUND: Midterm clinical and morphologic results of the septal-reshaping exclusion of anteroseptal dyskinetic or akinetic areas were evaluated. METHODS: From January to June 2003, 44 patients with myocardial infarction following left anterior descending coronary artery (LAD) occlusion underwent septal reshaping. The mean (+/- SD) New York Heart Association (NYHA) class ...
von Bardeleben R S - - 2004
Three-dimensional (3D) echocardiographic imaging has been introduced as a tool to improve the assessment of both morphologic and functional parameters of the cardiovascular system. In the past, data acquisition was limited due to time-consuming sequential acquisition of multiple triggered 2D image planes from 10-60 heart cycles using transesophageal rotational, transthoracic ...
Hoff L - - 2004
We have used acceleration sensors to monitor the heart motion during surgery. A three-axis accelerometer was made from two commercially available two-axis sensors, and was used to measure the heart motion in anesthetized pigs. The heart moves due to both respiration and heart beating. The heart beating was isolated from ...
Vahlhaus Christian - - 2004
AIMS: This study investigated the hypothesis that direct epicardial bipolar mapping is able to predict the recovery of left ventricular (LV) dysfunction in ischaemic myocardium. METHODS AND RESULTS: In 34 patients with CAD, a maximum of 102 bipolar epicardial electrograms per patient (n=3468 electrograms) were simultaneously recorded with a ventricular ...
Li Xiaokui - - 2003
OBJECTIVE: Our study aimed to investigate whether strain rate acceleration (SRA) during isovolumic contraction time (IVCT) could serve as a sensitive indicator of myocardial function. METHODS: A total of 8 sheep underwent occlusion of left anterior descending coronary artery or diagonal branches and 2 sheep underwent left circumflex coronary artery ...
Tanaka Hiroyuki - - 2003
"Ampulla" cardiomyopathy is a syndrome characterized by transient abnormal left ventricular wall motion with hypokinesia around the apical area and hyperkinesia at the basal area, without any detectable coronary lesion. Two cases of transient wall thickening of the left ventricular apex during recovery from "ampulla" cardiomyopathy are described. Apical wall ...
Climstein M - - 2003
Previous investigations reported alterations in myocardial fibres and systolic function associated with anabolic-androgenic steroid consumption by athletes. Advances in bio-medical technology have allowed further investigation in assessing the possible effects of anabolic-androgenic steroids on gross left ventricular kinetics. Twenty-three male strength and power athletes with a past and current history ...
Takahashi Masaki - - 2003
A 51-year-old Japanese man was admitted to hospital for evaluation of anterior chest pain at rest. He had a past history of cerebellar infarction when he was 47 years old. A conventional 2-dimensional echocardiogram revealed normal left ventricular function, and no abnormal findings. However, second harmonic imaging demonstrated 2 noncontractile ...
Murashita Toshifumi - - 2003
OBJECTIVE: Assessment of myocardial viability in akinetic areas is essential in surgery for ischemic heart disease, including coronary artery bypass grafting and left ventriculoplasty. The aim of this study is to evaluate the utility of quantitative indices of perfusion uptake, wall motion, and wall thickening of each region calculated by ...
Chung Chang-Min - - 2003
Previous studies have demonstrated improvement of regional wall motion and global left ventricular function after successful recanalization of chronic total occlusion in coronary artery. However, the difference of benefits of recanalization between infarct site and noninfarct site is unknown. This study assessed the changes in left ventricular ejection fraction, regional ...
Yokoyama Naoyuki - - 2003
Doxorubicin (DXR) is one of the most effective antineoplastic agents, but its use is limited by its myocardial toxicity. Myocardial injury reduces the cyclic variation of integrated backscatter (CV-IBS) and so the present study was designed to investigate whether CV-IBS can be used to detect the early phase of myocardial ...
Usyk Taras P - - 2003
INTRODUCTION: Asynchronous electrical activation can cause abnormalities in perfusion and pump function. An electromechanical model was used to investigate the mechanical effects of altered cardiac activation sequence. METHODS AND RESULTS: We used an anatomically detailed three-dimensional computational model of the canine ventricular walls to investigate the relationship between regional electrical ...
Ishii Katsuhisa - - 2003
BACKGROUND: Coronary vasospasm has been diagnosed by invasive provocative procedures during coronary arteriography. It would be useful to have a reliable, noninvasive, and safe diagnostic method for coronary vasospasm. Regional left ventricular (LV) diastolic dysfunction may persist without systolic dysfunction after an episode of coronary vasospasm. Color kinesis (CK) has ...
Garcia-Fernandez Miguel Angel - - 2003
The assessment of regional left ventricular (LV) function has been an important yet unresolved problem since the introduction of echocardiography as a diagnostic tool. Abnormal regional LV wall motion is an early finding in multiple cardiac pathologies and its diagnosis is of critical importance. In the last few years diagnostic ...
Zhu Hui - - 2003
OBJECTIVE: It is widely recognized that hemodynamic and wall mechanical forces are involved in the initiation and development of atherosclerosis. In the coronary vasculature, these forces are likely mediated by arterial dynamics and geometry. This research examines the hypothesis that coronary artery motion and geometry affect the local predisposition to ...
Weidemann Frank - - 2003
BACKGROUND: Enzyme replacement therapy (ERT) has been shown to enhance microvascular endothelial globotriaosylceramide clearance in the hearts of patients with Fabry disease. Whether these results can be translated into an improvement of myocardial function has yet to be demonstrated. METHODS AND RESULTS: Sixteen patients with Fabry disease who were treated ...
Cupps Brian P - - 2003
BACKGROUND: Because severe aortic insufficiency in the setting of preserved left ventricular function is often associated with a long asymptomatic period and unpredictable course on medical therapy, sensitive indices of left ventricular systolic performance are necessary for the optimal direction of therapeutic intervention. Because myocardial wall stress is closely related ...
Nahrendorf Matthias - - 2003
Our purpose was to study morphological, functional, and metabolic changes induced by chronic ischemia in myocardium supplied by the stenotic vessel and in the remote area by MR techniques. A new technique of image fusion is proposed for analysis of coronary artery stenosis involving coronary MR angiography and spectroscopic imaging. ...
Sheehan Florence H - - 2003
Sources of variability in defining the normal range for left ventricular (LV) motion from contrast ventriculograms were assessed by comparing the function of 183 normal patients from six sites in three countries. Wall motion was measured using the centreline method at seven regions around the LV contour. The influence of ...
Petersen S E - - 2003
BACKGROUND: The aim of this follow-up study was to investigate the late effects of acute coronary angioplasty (PTCA) on regional wall motion after the subacute phase of myocardial infarction (MI). METHODS AND RESULTS: Seventeen patients were investigated initially at a median of 11 days and again at 6 months after ...
Dou Jiangang - - 2003
The mechanism of ventricular thickening in normal humans was investigated using in vivo MRI. The hypothesis that myocardial laminar sheets contribute to ventricular thickening predominantly via sheet shear and sheet extension, as previously found invasively in canine studies at particular ventricular sites, was tested. In normal human subjects, registered images ...
Lowenstein Jorge - - 2003
BACKGROUND: Coronary flow reserve (CFR) can be measured in the left anterior descending artery (LAD) by dipyridamole transthoracic Doppler echocardiography (DTTDE). This information may critically improve the diagnostic accuracy of dipyridamole stress echocardiography, which is limited by moderate sensitivity. OBJECTIVE: We sought to assess the feasibility and accuracy of value ...
Lapeyre André C AC - - 2003
BACKGROUND: Several techniques have been used to quantify the myocardium at risk, including measurement of regional ventricular function with contrast ventriculography and measurement of perfusion defect size with tomographic technetium-99m-sestamibi imaging. This study evaluates the correlation between these 2 techniques. METHODS: Twenty-three patients with angiographically documented coronary occlusion and acute ...
Mabuchi M - - 2003
Previous studies have demonstrated that myocardial perfusion imaging using 99mTc-tetrofosmin at rest allows viability assessment similar to that obtained with 201Tl imaging and 18F-fluorodeoxyglucose positron emission tomography (18F-FDG PET). The simultaneous assessment of perfusion and regional function is now available by quantitative gated myocardial perfusion single-photon emission computed tomography (SPECT). ...
Morimoto Shin-Ichiro - - 2003
It has been reported that some patients with acute myocarditis have transient ventricular thickening associated with narrowing of the left ventricular cavity caused by interstitial edema. The present study investigated this phenomenon in 20 patients with acute myocarditis. Based on the sum of the interventricular septal wall thickness and left ...
Lunkenheimer P P - - 2003
BACKGROUND: Because of the variation in the surgical procedures designed to reduce ventricular radius, along with differences in hospital care, it is difficult to disentangle the factors that may contribute to the success or failure of the partial left ventriculectomy. METHODS AND RESULTS: We undertook partial left ventriculectomy in 18 ...
Kuga Hideyo - - 2003
To evaluate the effects of synthetic human atrial natriuretic peptide (hANP) on myocardial reperfusion injury and left ventricular remodeling, 19 patients within 12 h of a first attack of anterior myocardial infarction (AMI) underwent intracoronary injection of 25 microg of hANP immediately after coronary angioplasty, combined with intravenous infusion of ...
Ciliberto Guglielma Rita - - 2003
BACKGROUND: Coronary allograft vasculopathy (CAV) remains a main factor limiting long-term survival after heart transplantation (HTX). The diagnosis of CAV is still based on serial coronary angiography. In this study, we evaluated the prognostic value of high-dose dipyridamole echocardiography in HTX. METHODS: Sixty-eight patients underwent dipyridamole echocardiography within 48 hours ...
Dambrauskaite Virginija - - 2003
The evaluation of regional right ventricular function by ultrasound remains a challenge. This case report demonstrates the potential value of the new cardiac deformation indices, strain and strain rate imaging, in determining the differing regional abnormalities in longitudinal right ventricular function before and after bilateral lung transplantation. These indices were ...
Podgoreanu Mihai V - - 2003
Conventional echocardiographic interpretation of regional wall motion abnormalities is subjective and experience dependent. Delayed contraction in the ejection phase (tardokinesis) and regional systolic asynchrony, sensitive markers of myocardial ischemia, cannot be accurately assessed visually. We used color kinesis (CK), a technique that evaluates spatiotemporal patterns of endocardial motion, to objectively ...
Hansen Alexander - - 2003
BACKGROUND: Stress echocardiography is increasingly used to identify coronary artery disease, but quantitative techniques are required to improve the accuracy of this method. Current algorithms used to analyze wall motion usually neglect motion asynchrony that is found in acute ischemia. Fourier phase imaging of echocardiographic images may offer the possibility ...
Hirooka Keiji - - 2003
Cardiac involvement in progressive systemic sclerosis (PSS) is common and has a strong negative impact on the prognosis, especially when autoantibodies are present. To determine whether ultrasonic tissue characterization can detect early ultrastructural changes in the sclerodermal myocardium, we analyzed the transmural heterogeneity in myocardial integrated backscatter (THIB). "A-THIB" was ...
Kukulski Tomasz - - 2003
OBJECTIVES: The goal of this study was to investigate whether the changes in myocardial deformation measured with ultrasonic strain could accurately identify acutely ischemic myocardium during coronary angioplasty. BACKGROUND: Early identification of acute myocardial ischemia has important clinical implications. The accuracy of ultrasonic strain for the detection of acute myocardial ...
Weiss Clifford R - - 2003
PURPOSE: To simultaneously differentiate stunned, infarcted, and normal myocardial regions by using gadolinium-enhanced cine magnetic resonance (MR) imaging with magnetization transfer contrast. MATERIALS AND METHODS: Twelve dogs were imaged on days 1 and 8 after transient 90-minute coronary artery occlusion. A magnetization transfer contrast with echo-train readout (MTET) MR sequence ...
Yang Hua - - 2003
BACKGROUND: The distribution and magnitude of left ventricular hypertrophy are not uniform in patients with hypertrophic cardiomyopathy (HCM). Previous echocardiographic studies have focused on global left ventricular function. Recently, myocardial Doppler strain (epsilon) imaging, a newly developed technique, has allowed the quantification of regional myocardial motion. The aim of this ...
Nakatani Satoshi - - 2003
Although left ventricular wall motion has been usually assessed with four-point scale (1 = normal; 2 = hypokinesis; 3 = akinesis; 4 = dyskinesis) based on the visual assessment, this method is only qualitative and subjective. Recently, a new echocardiographic system that enables calculation of myocardial strain rate based on ...
Rademakers Frank - - 2003
Regional remodelling after a left ventricular myocardial infarction is the first step in a cascade that may lead to heart failure and death. To understand better the mechanisms underlying this process, it is important to study not only the evolution in local deformation parameters but also the corresponding loading conditions. ...
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