Search Results
Results 301 - 350 of 1669
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Reuss Christina S - - 2007
This report describes a variant of transient regional left ventricular dysfunction in which isolated basal left ventricular akinesia with normal mid-ventricular (papillary-level) wall motion and apical hypercontractility were noted in young women (mean age 31 years). This finding was demonstrated in 3 consecutive patients; the first patient was experiencing emotional ...
Vartdal Trond - - 2007
OBJECTIVES: The objective of this study was to investigate whether strain Doppler echocardiography performed immediately after revascularization by percutaneous coronary intervention could predict the extent of myocardial scar, determined by contrast-enhanced magnetic resonance imaging (MRI). BACKGROUND: There is considerable variability in survival rate after percutaneous coronary intervention, and accurate early ...
Beohar Nirat - - 2007
The purpose of this study was to provide the first in vivo validation of a three-dimensional (3D) method to quantify regional left ventricular (LV) function with cardiac magnetic resonance (CMR) imaging after myocardial infarction (MI). Current cardiac methods to analyze LV function are limited by geometric assumptions and observer biases. ...
Lucats Laurence - - 2007
AIMS: Post-systolic wall thickening (PSWT) occurs after aortic valve closure. This waste of thickening does not participate in ejection. PSWT increases with myocardial ischaemia and stunning but the effects of anti-anginal drugs on PSWT during myocardial dysfunction remain unknown. The effects of two heart rate reducing agents, i.e. the beta-blocker ...
Takagawa Junya - - 2007
Efficacy of potential treatments for myocardial infarction (MI) is commonly assessed by histological measurement of infarct size in rodent models. In experiments involving an acute MI setting, measurement of the infarcted area in tissue sections of the left ventricle is a standard approach to determine infarct size. This approach has ...
Ustun Ali - - 2007
Imaging during a period of minimal myocardial motion is of paramount importance for coronary MR angiography (MRA). The objective of our study was to evaluate the utility of FREEZE, a custom-built automated tool for the identification of the period of minimal myocardial motion, in both a moving phantom at 1.5 ...
Bjork Ingul Charlotte - - 2007
BACKGROUND: Wall motion score at dobutamine stress echocardiography is an independent predictor of mortality. We sought to determine whether quantification of DSE by strain rate imaging was incremental to wall motion score for predicting outcome. METHODS AND RESULTS: In 646 patients undergoing dobutamine stress echocardiography for the evaluation of known ...
Hanna Mazen - - 2007
Differentiating the ventricular dysfunction caused by apical ballooning syndrome (ABS) from that caused by apical involvement in an acute coronary syndrome (ACS) currently requires coronary angiography. We sought to determine if echocardiography could differentiate these two syndromes by the extent of regional left ventricular (LV) and right ventricular (RV) dysfunction. ...
Ohara Yoshikazu - - 2007
Strain Doppler echocardiography can detect systolic regional myocardial dysfunction. This study assessed whether strain could predict recovery of regional left ventricular function in patients with acute myocardial infarction (AMI) after percutaneous coronary intervention. Forty-three patients with anterior AMI undergoing successful percutaneous coronary intervention of the left anterior descending coronary artery ...
Storkholm Jan Henrik - - 2007
Small intestinal obstruction is a frequently encountered clinical problem. To understand the mechanisms behind obstruction and the clinical consequences, data are needed on the relation between the morphologic and biomechanical remodeling that takes place in the intestinal wall during chronic obstruction. We sought to determine the effect of partial obstruction ...
Nasir Khurram - - 2007
BACKGROUND: An elevated homocysteine (Hcy) level has been reported to be a risk factor for the development of congestive heart failure in individuals free of myocardial infarction. In this study, we aim to investigate the relationship between Hcy levels and regional left ventricular function in an asymptomatic population. METHOD AND ...
Derian Wissam - - 2007
Apical ballooning (takotsubo syndrome) mimics acute myocardial infarction with transient apical dyskinesia and normal coronary arteries. It is often precipitated by emotional or physical stress. The prevalence of this syndrome has been increasing, probably because it is now more frequently recognized. Multiple theoretical hypotheses have been developed to explain its ...
Awan Muhammad Asad Bilal - - 2007
OBJECTIVE: To determine the early effects of Coronary Artery Bypass Grafting (CABG) on regional left ventricular wall motion abnormality in patients undergoing surgery for proven Coronary Artery Disease (CAD). DESIGN: Quasi-experimental study. PLACE AND DURATION OF STUDY: Department of Cardiac Surgery, National Institute of Cardiovascular Diseases, Karachi. from October 2005 ...
Plunkett Mark D - - 2007
This chapter describes the structure/function relationships of the right ventricle (RV), and shows how the geometry of the helical ventricular myocardial band model defines spatial geometry of the free wall and septum that underlie dynamic action. Myocardial fiber orientation is the keynote to performance in health and disease. The transverse ...
Lee Mu Sook - - 2007
Transient left ventricular apical ballooning is characterized by transient wall motion abnormalities involving the left ventricular apex and mid-ventricle in the absence of coronary arterial occlusion. A 66-year-old woman presented to the emergency department with chest pain that mimicked acute myocardial infarction. An aortogram showed akinesis from the mid to ...
Cangella F - - 2007
BACKGROUND: Tako-tsubo syndrome (TTS) in its typical (apical) and atypical (non-apical) forms is being increasingly recognized in the West owing to early systematic coronary angiography in acute coronary syndromes (ACS). AIM OF THE STUDY: To assess the incidence, the clinical characteristics and the outcome of TTS in a single high ...
Ammar Khawaja Afzal - - 2007
BACKGROUND: The relationship between electrocardiographic unrecognized myocardial infarction (UMI), abnormal functional status, echocardiographic abnormalities, and mortality has not been evaluated. METHODS: A population-based random sample of 2042 Olmsted County residents, age > or = 45 years, was studied by self-administered questionnaire, chart review, ECG and echocardiogram, and 5 year follow-up ...
Fujii Hideki - - 2007
We report a case of tako-tsubo cardiomyopathy associated with brain metastasis of seminoma. This disease is characterized by transient cardiac wall motion abnormalities, electrocardiographic changes and minimal myocardial enzymatic release. During the hospital days, acute congestive heart failure suddenly appeared. The electrocardiogram showed a ST segment elevation in V1-3 and ...
Lekadir Karim - - 2007
This paper presents a new approach to regional myocardial contractility analysis based on inter-landmark motion (ILM) vectors and multivariate outlier detection. The proposed spatio-temporal representation is used to describe the coupled changes occurring at pairs of regions of the left ventricle, thus enabling the detection of geometrical and dynamic inconsistencies. ...
Dorri Farshad - - 2007
OBJECTIVE: We used the technique of peeling of myocardial aggregates, usually described as 'fibres', to determine the spatial arrangement of the myocytes in the left ventricular wall of a healthy autopsied human heart. METHODS: We digitised the left ventricular outer and inner boundaries, as well as the pathways in space, ...
Fernandes Juliano Lara - - 2006
BACKGROUND: The association of plaques with outward arterial remodeling and acute coronary syndromes (ACS) has been mostly investigated by cross-sectional intravascular ultrasound studies. Magnetic resonance imaging (MRI) has made it possible to noninvasively assess the coronary vessels of patients with chronic coronary artery disease, but no study has been done ...
Taki, Junichi
Abnormal septal motion after coronary artery bypass graft surgery (CABG) is a common finding. This study was undertaken to investigate the change in various global and regional ventricular function parameters measured by gated myocardial perfusion SPECT after surgery and to determine which quantitative parameter of WT and WM is more ...
Beer Meinrad - - 2007
To evaluate multivoxel (31)P-MR spectroscopy (MRS) for assessment of energy metabolism in patients with myocardial infarction (MI) in correlation to left ventricular (LV) wall thickness and the outcome of revascularization. Thirty patients with subacute anterior myocardial infarction and planned revascularization were enrolled. 3D-chemical shift imaging was applied to determine PCr/ATP ...
Biyik I - - 2006
We investigated the incidence and severity of echocardiographic and clinical abnormalities in patients with psoriasis and their relationship to the severity, duration and type of psoriasis and other related factors. A total of 216 psoriasis patients and 216 control subjects were included in this study. Left and right heart dimensions, ...
Rouine-Rapp Kathryn - - 2006
We prospectively studied 29 consecutive neonates undergoing an arterial switch operation to determine if segmental wall motion abnormalities (SWMA) represented myocardial ischemia. Intraoperative transesophageal echocardiogram was recorded at baseline and twice after cardiopulmonary bypass. Cardiac troponin I (cTnI) levels were measured before sternal incision and 3, 6, 12, 24, 48, ...
Unlu Muharrem - - 2006
RATIONALE AND OBJECTIVES: The aim was to evaluate the left ventricular wall motion abnormalities, perfusion and late contrast enhancement patterns on magnetic resonance imaging (MRI) in patients with 70% or higher degree stenosis or occlusion of coronary arteries on coronary angiography. MATERIALS AND METHODS: Twenty-four patients (5 women, 19 men, ...
Chan Jonathan - - 2006
OBJECTIVES: This study sought to differentiate the transmural extent of infarction (TME) by assessment of the short-axis and long-axis function of the left ventricle (LV) using 2-dimensional (2D) strain. BACKGROUND: The differentiation of subendocardial infarction from transmural infarction has significant prognostic and clinical implications. METHODS: Contrast-enhanced magnetic resonance imaging (CE-MRI) ...
Ogawa Keitaro - - 2006
A novel 2-dimensional (2-D) echocardiographic tracking method enables the automated tracking of displacement between 2 points of interest in echocardiographic images. The purpose of this study was to evaluate whether this 2-D tracking method could be used to measure left ventricular (LV) wall thickness and percent systolic wall thickening (%WT) ...
Becker Michael - - 2006
Pixel tracking-derived myocardial deformation imaging is a new echocardiographic modality which allows quantitative analysis of segmental myocardial function on the basis of tracking of natural acoustic markers in 2D echocardiography. This study evaluated whether myocardial deformation parameters calculated from 2D echocardiography allow assessment of transmurality of myocardial infarction as defined ...
Choi Eui-Young - - 2006
BACKGROUND: We sought to determine the accuracy of myocardial contrast echocardiography (MCE)-derived index of myocardial blood flow and myocardial blood volume fraction (MBVF) in predicting transmural extent of infarction and wall-motion recovery. METHODS: Low and high mechanical index MCE and contrast-enhanced magnetic resonance imaging were performed 5 to 7 days ...
Hoffmann Rainer - - 2007
BACKGROUND: Echocardiography based myocardial perfusion imaging and regional wall motion analysis are used for evaluation of coronary artery disease and regional myocardial abnormalities. AIM: This study sought to compare myocardial contrast echocardiography (MCE) and 2D echocardiography with regard to interobserver variability and detection of regional myocardial abnormalities. METHODS: In 70 ...
Mahenthiran Jo - - 2006
Patients with extensive regional wall motion abnormalities are predisposed to development of ventricular tachyarrhythmia. The prognostic effect of this in patients with an implantable cardioverter-defibrillator (ICD) and coronary artery disease (CAD) is not known. Echocardiographic left ventricular systolic indexes, wall motion score index (WMSI), and extent of regional akinesia in ...
Galiuto Leonarda - - 2007
BACKGROUND: Recent studies have shown that microvascular dysfunction after myocardial infarction is a dynamic phenomenon. AIMS: To evaluate the implications of dynamic changes in microvascular dysfunction on contractile recovery and left ventricular remodelling, and to identify the ideal timing of assessment of such microvascular dysfunction. METHODS AND RESULTS: In 39 ...
Kilic Ahmet - - 2006
BACKGROUND: Cardiac remodeling has been shown to have deleterious effects at both the global and local levels. The objective of this study is to investigate the role of strain in the initiation of structural and functional changes of myocardial tissue and its relation to alteration of calcium-handling proteins during cardiac ...
Lentschener Claude - - 2006
We diagnosed transient left ventricular apical wall motion abnormalities after surgery in a patient presenting with a clinical and electrocardiographic picture of acute myocardial infarction in the absence of significant coronary disease. These angiographic, clinical, and electrocardiographic features satisfied the criteria of the recently described tako-tsubo-like left ventricular dysfunction.
Cuvillon Loïc - - 2006
Active robotic filtering is probably the solution for beating heart Totally Endoscopic Coronary Artery Bypass Grafting (TECABG). In this work, we assess the heart motion dynamics by simultaneous use of high-speed imaging of optical markers attached to the heart, ECG signals and ventilator airflow acquisitions. Our goal is to assess ...
Wu Ming-Ting - - 2006
BACKGROUND: Diffusion tensor magnetic resonance imaging (DT-MRI) provides a means for nondestructive characterization of myocardial architecture. We used DT-MRI to investigate changes in direction-dependent water diffusivity to reflect alterations in tissue integrity (trace apparent diffusion coefficients [ADCs] and fractional anisotropy [FA]), as well as indicators of remodeling of fiber helix ...
Choi Jae-Sung - - 2006
BACKGROUND: Intramyocardial injection of vascular endothelial growth factor (VEGF) plasmid DNA was studied to demonstrate improvement of regional myocardial function. METHODS: Twenty-one pigs that had undergone ligation of the left anterior descending coronary artery were randomly allocated to one of two treatments: intramyocardial injection of pCK-VEGF165 (VEGF group) or pCK-Null ...
Yamamoto Akira - - 2006
OBJECTIVE: We have developed a program to quantify regional left ventricular (LV) function and wall motion synchrony using ECG-gated myocardial perfusion SPECT (MPS). This preliminary study was undertaken to validate the use of this program for estimating regional LV systolic function. METHODS: Patients were subjected to MPS by 99mTc-sestamibi at ...
Vallès Ermengol - - 2007
Transient left ventricular apical ballooning (TAB) is a condition that mimics acute coronary syndrome typically without coronary angiographic stenosis. Patients present with typical chest pain, ECG changes suggesting ischemia, and a slight elevation of myocardial injury markers such as creatine kinase and troponines. Ballooning during ventricular systole of the cardiac ...
Jarnert Christina - - 2007
PURPOSE: To assess factors of importance for long term prognosis in patients with acute myocardial infarction (AMI) and heart failure and normal or mildly reduced left ventricular systolic function. SUBJECTS AND METHODS: Seventy-one consecutive AMI-survivors with clinical or radiological signs of heart failure and an echocardiographically determined wall motion score ...
Cheng Allen - - 2006
BACKGROUND: Undersized mitral annuloplasty, widely used for ischemic and functional mitral regurgitation (MR), has been proposed as an "annular solution to a ventricular problem." Beyond relief of MR, it is thought to improve global left ventricular (LV) shape, hence potentially reducing myocardial stress and promoting beneficial reverse LV remodeling. We ...
Nguyen Thanh D - - 2006
Motion artifacts and the lack of accurate detection of cardiac motion present a major challenge for high-resolution cardiac MRI. Recently a multidimensional cardiac fat navigator was proposed to provide a fast and direct measurement of bulk cardiac motion. The objective of this study was to demonstrate the feasibility of employing ...
Morda Louis S - - 2006
Left-ventricular (LV) segmentation is essential in the early detection of heart disease, where left-ventricular wall motion is being tracked in order to detect ischemia. In this paper, a new method for automated segmentation of the left-ventricular chamber is described. An autocorrelation-based technique isolates the LV cavity from the myocardial wall ...
Pingitore Alessandro - - 2006
BACKGROUND: The present study aimed to explore the relationship between the transmural extent of myocardial necrosis and mechanical markers of myocardial ischaemia in man. METHODS: A group of 40 patients with previous Q-wave myocardial infarction and a left ventricular ejection fraction (LVEF) of 27 +/- 11% was studied by cine ...
Skidmore Kimberly L - - 2006
Air embolization to the coronary arteries is a common cause of myocardial ischemia during open heart surgery. Carbon dioxide emboli may be absorbed faster than air emboli. In this randomized, double blind, placebo-controlled trial, we determined that flooding the surgical field with carbon dioxide is associated with improved myocardial function ...
Tohno Setsuko - - 2006
To elucidate compositional changes of the cardiac walls with development and aging, the authors investigated changes of elements in the atrial and ventricular walls of monkeys. The left and right atrial walls, left and right ventricular walls, and interatrial and interventricular septa were resected from the subjects. The subjects consisted ...
Klein Lucas J - - 2006
Previous studies showed that glucose-insulin-potassium (GIK) increases cardiac output in patients after cardiac surgery and improves segmental myocardial wall motion. We hypothesized that GIK improves regional wall motion, detects contractile reserve, and predicts functional recovery at follow-up to a similar extent as low-dose dobutamine (LDD) in patients with recent myocardial ...
Fernandes Verônica R S - - 2006
OBJECTIVES: This study sought to determine whether increased carotid intima-media thickness (IMT) is related to reduced regional myocardial function in participants of the Multi-Ethnic Study of Atherosclerosis (MESA). BACKGROUND: Carotid artery IMT is an established index of subclinical atherosclerosis, and tagged magnetic resonance imaging (MRI) can detect incipient alterations of ...
Horiguchi Jun - - 2007
The purpose of this study is, using a 16-section multidetector-row helical computed tomography (MDCT) scanner with retrospective reconstruction, to compare variability in repeated coronary calcium scoring and qualitative scores of the motion artifacts. One hundred forty-four patients underwent two subsequent scans using MDCT. According to Agatston and volume algorithms, the ...
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