Search Results
Results 351 - 400 of 1672
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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 ...
Jakobsen Carl-Johan - - 2006
OBJECTIVE: To evaluate the impact of different echocardiographic methods for assessment of left ventricular dysfunction on the predictive value of EuroSCORE and thus its reliability in daily practice and benchmarking. METHODS: Twenty-five recordings obtained by transthoracic echocardiography, optimal for study using four different echocardiographic methods, were examined and placed into ...
Selby Nicholas M NM Department of Renal Medicine, Derby City Hospital, Derby, London, UK. - - 2006
Cardiac failure and cardiovascular death are extremely prevalent in dialysis patients. Recurrent subclinical myocardial ischemia is important in the genesis of heart failure in nondialysis patients. We examined whether this phenomenon occurs in response to the stress of hemodialysis (HD). Eight patients prone to intradialytic hypotension were recruited for a ...
Carr-White Gerald S - - 2006
OBJECTIVES: To investigate the performance of non-invasive markers used in stress echocardiography to detect the presence and depth of myocardial ischaemia. We therefore sought to compare these non-invasive markers during acute coronary occlusion in humans. METHODS: 27 patients with stable angina and normal LV cavity size were studied during off-pump ...
Wahle Andreas A Department of Electrical and Computer Engineering, The University of Iowa, 4016 Seamans Center, Iowa City, IA 52242, USA. - - 2006
The relationships among vascular geometry, hemodynamics, and plaque development in the coronary arteries are complex and not yet well understood. This paper reports a methodology for the quantitative analysis of in vivo coronary morphology and hemodynamics, with particular emphasis placed on the critical issues of image segmentation and the automated ...
Paetsch Ingo - - 2006
AIMS: To determine the interobserver variability for identifying inducible left ventricular (LV) wall motion abnormalities during high-dose dobutamine/atropine stress cardiovascular magnetic resonance (DSMR). METHODS AND RESULTS: Four readers from various institutions were supplied with the image data from 150 consecutive DSMR examinations and asked to grade wall motion and image ...
Jung Bernd - - 2006
Data acquisition for phase contrast velocity mapping of myocardial motion is typically based on multiple breath-held 2D measurements with limited acquisition duration and consequently relatively poor temporal resolution. In order to overcome the limitations of breath-hold acquisitions, an improved navigator-guided technique was implemented based on 2 navigator signals within each ...
Haraikawa Toyoaki - - 2006
PURPOSE: Using the raw data from coronary computed tomography (CT) angiography, multislice CT (MSCT) can be used to evaluate cardiac function. However, the accuracy of left ventricular (LV) wall motion assessment by MSCT has not been thoroughly investigated. We investigated whether 16-channel MSCT could accurately assess LV wall motion by ...
Buckberg Gerald D - - 2006
OBJECTIVE: A helical configuration underlies the anatomy of cardiac structure, and a structure/function relationship is needed to determine if the ventricular myocardial band model defines this spatial relationship. This report explores how studies of velocity-encoded phase contrast magnetic resonance imaging (MRI) for myocardial motion and fiber tracking algorithms that imply ...
Klemm Hanno U - - 2006
BACKGROUND: Experimental data of simultaneous acquired activation and motion (AM) propagation from human subjects are not available. OBJECTIVES: The purpose of this study was to demonstrate the feasibility of a novel mapping technique allowing combined analysis of AM timing in vivo and to delineate the influence of chronically ischemic tissue ...
Jung Bernd - - 2006
OBJECTIVE: Velocity-encoded phase contrast magnetic resonance imaging (MRI) provides a tool to quantify regional myocardial wall motion of the entire heart. It allows the acquisition of three-directional velocity vector fields with high spatial resolution that reflect the temporal evolution of myocardial velocities over the cardiac cycle. In contrast to other ...
Ballester-Rodés Manel - - 2006
OBJECTIVE: The chronology of electrical events that mechanically activate the myocardium has been described as initiating at the level of the septum, spreading to the apex, then to the bodies of both ventricles and eventually to the base of the heart (apex-to base activation). It has recently been suggested that ...
Hristov Nikola - - 2006
OBJECTIVE: Determine if ventricular septum structure and function relationships parallel the left ventricular free wall descending and ascending segments of the helical heart. METHODS: Forty pigs (30-38 kg) were studied physiologically by sonomicrometer to determine if septal fiber orientation resembled responses in the free wall. Following pilot studies in the ...
Fogel Mark A - - 2006
Cardiac magnetic resonance (CMR) has been helpful in adults in the diagnosis of arrhythmogenic right ventricular dysplasia. Short of direct surgical observation or autopsy, no gold standard exists. CMR diagnostic criteria include right atrial and ventricular dilation, regional right ventricular (RV) wall motion abnormalities, outflow tract ectasia, and myocardial fatty ...
Tóth Miklós - - 2006
The round window niche is a bony pouch of the tympanic cavity and clinically frequently explored, therefore its topography has fundamental impact on microsurgery. A total of 783 macerated and formalin-fixed temporal bones were used to study the normal anatomy of the round window and its development. The ossification of ...
Cianciulli Tomás F - - 2006
OBJECTIVES: (1) Evaluate wall motion and perfusion abnormalities after reperfusion therapy of the culprit lesion, (2) delineate the ability of myocardial contrast echocardiography (MCE) to evaluate the microvasculature after reperfusion, in order to distinguish between stunning and necrosis in the risk area. METHODS: We analyzed 446 segments from 28 patients, ...
Fischer R W - - 2006
Coronary artery MRI methods utilize breath holds, or diaphragmatic navigators, to compensate for respiratory motion. To increase image quality and navigator (NAV) gating efficiency, slice tracking is used, with more sophisticated affine motion models recently introduced. This study assesses the extent of remaining coronary artery motion in free breathing NAV ...
Cheng Allen - - 2006
BACKGROUND AND AIM OF THE STUDY: In some patients, dysfunction in a localized infarct region spreads throughout the left ventricle to aggravate mitral regurgitation and produce deleterious global left ventricular (LV) remodeling. Alterations in transmural strains could be a trigger for this process, as these changes can produce apoptosis and ...
Laurent Yves - - 2006
We report a case of deliberate ingestion of 12.5 g chloral hydrate in a 25-year-old psychiatric patient. Coma and life-threatening ventricular dysrhythmias were observed soon after ingestion. Repeated electrocardiographic examination was consistent with ischemic changes appearing on day 3. They were associated with segmental abnormal left ventricular wall motion by ...
Apple Kimberly A - - 2006
BACKGROUND: A cause-effect relationship has been established between MMP activation and left ventricular (LV) remodeling following myocardial infarction. The goal of the present study was to examine a selective MMP inhibitor (sMMPi) strategy that effectively spared MMP-1, -3, and -7 with effect to regional and global left ventricular remodeling in ...
Abbara Suhny - - 2006
A sizable portion of ventricular tachycardia circuits are epicardial, especially in patients with non-ischemic cardiomyopathy, e.g. Chagas disease. Thus there is a growing interest among the electrophysiologists in transepicardial mapping and myocardial ablation for treatment of arrhythmias. However, increased epicardial fat can be a significant hindrance in procedural success as ...
Douglas Yvonne L - - 2006
During embryonic development, the common pulmonary vein (PV) becomes incorporated into the left atrium, giving rise to separate PV ostia. We describe the consequences of this incorporation process for the histology of the left atrium and the possible clinical implications. The histology of the left atrial (LA) wall in relation ...
Tsukamoto Masaki - - 2006
Patients with apical hypertrophic cardiomyopathy (APH) associated with paradoxic jet flow (ie, diastolic flow away from the apex) may gradually develop an apical aneurysm, which often leads to arrhythmia and mural thrombus formation. We observed systolic outward motion of the left ventricular apical myocardium in patients with APH using a ...
Ryf Salome - - 2006
PURPOSE: In ischemic myocardium systolic strain is reduced and followed by a deformation after systole, the so-called post-systolic shortening. The presence of post systolic shortening is therefore considered a marker of viability even though its mechanism remains unclear. The hypothesis was tested whether post-systolic shortening might be a passive recoil ...
Kunii Shutaro - - 2006
OBJECTIVE: To evaluate fetal myocardial movement by using newly developed ultrasonic technique. METHODS: We analyzed 50 normal fetuses between 25 and 41 weeks' gestation for changes in thickness of fetal myocardium using the phased-tracking method, a technique with high vertical distance resolution and the potential to evaluate fine ventricular wall ...
Hedberg Pär - - 2006
Mitral annulus motion (MAM) is a predictor of mortality in selected patient groups, but its prognostic value in less selected populations is not known. In a community-based random sample of 75-year-old men and women (n = 408), left ventricular function was measured as: (1) maximum amplitude of MAM; and (2) ...
Gimelli Alessia - - 2006
OBJECTIVE: In patients with ischaemic left ventricular dysfunction, multivessel disease and dominance of necrotic myocardium, perioperative mortality due to coronary artery bypass grafting is still a rather unclear issue. The aim of this study was to analyse the impact of different imaging variables in predicting perioperative mortality. METHODS: We selected ...
Sachdev Vandana - - 2006
BACKGROUND: Regional abnormalities in myocardial systolic function can be detected with myocardial strain measurements derived from Doppler tissue echocardiography. We studied longitudinal strain measurements in patients with evidence of myocardial infarction by cardiac magnetic resonance imaging to determine whether end-systolic strain could identify the severity of the infarction. METHODS: A ...
Mansor W W Faculty of Electrical Engineering, Universiti Teknologi MARA, Shah Alam, Selangor, - - 2006
In fetal heart monitoring using Doppler ultrasound signals the cardiac information is commonly extracted from non-directional signals. As a consequence often some of the cardiac events cannot be observed clearly which may lead to the incorrect detection of the valve and wall motions. Here, directional signals were simulated to investigate ...
Luo Jianwen J Department of Biomedical Engineering, Columbia University, New York, NY 10025, USA. - - 2006
Myocardial elastography is a novel method for noninvasively assessing regional myocardial function, with the advantages of high spatial/temporal resolution, high signal-to-noise ratio and angle-independence. In this paper, in vivo experiments were performed in anesthetized normal and infarcted mice using a high-resolution ultrasound system. Radio-frequency signals were acquired at a high ...
Lee Byeong-Il - - 2006
We developed methods to represent cardiac motility. Using an innovative model, we estimated several parameters of cardiac features. We implemented the parameterized super quadric model to visualize the motion of a left ventricle (LV) with OpenGL and Visual C++. We displayed myocardial wall thickening with a super-ellipsoidal model. The time ...
Baks Timo - - 2006
The effects of reperfusion on early and late infarct size and left ventricular wall characteristics were studied by performing cine-magnetic resonance imaging, first-pass perfusion, and delayed enhancement imaging in 22 patients at five days and five months after successful primary angioplasty for first acute myocardial infarction. Infarct size, end-diastolic wall ...
Helm Patrick A - - 2006
Ventricular remodeling of both geometry and fiber structure is a prominent feature of several cardiac pathologies. Advances in MRI and analytical methods now make it possible to measure changes of cardiac geometry, fiber, and sheet orientation at high spatial resolution. In this report, we use diffusion tensor imaging to measure ...
Miyabe Hiromichi - - 2005
BACKGROUND: Fatty acid metabolism in patients with myocardial infarction (MI) who undergo coronary reperfusion has not been fully elucidated and was investigated in the present study using positron emission tomography. METHODS AND RESULTS: The clearance rate constant of 11C-acetate (acetate-Kmono) and that of 11C-palmitate (palmitate-Kmono) from the myocardium were calculated ...
Aziz Kalimuddin - - 2005
AIMS: The criterions for the timing of surgical intervention in children with rheumatic mitral or aortic valvar regurgitation are not defined. I hypothesized that, in children with chronic mitral or aortic regurgitation, an index for decompensation could be created by using the ratio of the diastolic left ventricular wall thickness ...
Donohue Daniel - - 2005
Stress-induced apical ballooning has been described as a reversible condition involving the apical left ventricular wall, sparing the base, and causing a ballooning appearance of the left ventricle during systole despite normal coronaries. We are presenting 4 cases of apical ballooning seen at our institution with echocardiographic correlation. Echocardiography showed ...
Pilla James J - - 2005
Early infarct expansion impairs function of normally perfused borderzone myocardium (BZM), initiates adverse remodeling, and portends a poor long-term outcome. Early ventricular restraint has been demonstrated to improve global remodeling but its effect on BZM function has not been assessed. Using an ovine model of infarct induced remodeling and MRI, ...
Hacker Marcus - - 2006
INTRODUCTION: Left (LVEF) and right ventricular ejection fraction (RVEF) as well as LV regional wall motion at rest are valuable tools to monitor and tailor treatment of congestive heart failure (CHF) patients. Gated blood pool SPECT (GBPS) is under evaluation as an "all-in-one" technique, providing information on LVEF, RVEF, and ...
Edvardsen Thor - - 2006
OBJECTIVE: We investigated whether regional coronary calcium score by computed tomography is related to regional left ventricular systolic function measured by MRI tagging in participants of the Multiethnic Study of Atherosclerosis. METHODS AND RESULTS: The Multiethnic Study of Atherosclerosis is a prospective observational study of men and women without a ...
Chen Junjie - - 2005
Dynamic changes of myocardial fiber and sheet structure are key determinants of regional ventricular function. However, quantitative characterization of the contraction-related changes in fiber and sheet structure has not been reported. The objective of this study was to quantify cardiac fiber and sheet structure at selected phases of the cardiac ...
Lewis William R - - 2005
Using percutaneous angioplasty to induce the ischemic cascade in the cardiac catheterization laboratory, echocardiographic wall motion abnormalities have been documented to precede electrocardiographic abnormalities and angina. Therefore, detection of cardiac wall motion abnormalities is potentially more sensitive than the history, physical examination, and ECG for identification of myocardial ischemia. Echocardiography ...
Husic Mirza - - 2005
After acute myocardial infarction (AMI), regional diastolic function may be abnormal even though regional systolic function appears normal. However, it is not known whether this represents a transient or permanent phenomenon, and the relation to myocardial viability is not known. To determine this we assessed regional left ventricular function during ...
Ashford M W MW - - 2005
BACKGROUND: Duchenne muscular dystrophy (DMD) is an inherited disease characterized by early onset of skeletal muscle degeneration and progressive weakness. Although dilated cardiomyopathy may occur during adolescence, it is often undetected early in its course because of physical inactivity and generalized debilitation. The purpose of this study was to apply ...
Veyrat Colette - - 2005
There is renewed interest in isovolumic contraction (IC) in tissue Doppler echocardiography of the myocardial walls, which is revisited in this editorial with new regional velocity data. The aims are to recall traditional background information and to emphasize the need to master the rapidly evolving tissue Doppler procedures for the ...
Buckberg Gerald - - 2005
Left ventricular geometry is distorted after anterior infarction caused by occlusion of a wrap around left anterior descending artery. Loss of the apex creates a spherical left ventricular (LV) chamber, whose rebuilding requires reconstruction techniques that exclude the non-functional inferior wall. The described technique of tailoring the apex defines a ...
Fujii Hiromichi - - 2005
It has been reported that surgical repair of anterior left ventricular (LV) aneurysms is associated with reverse remodeling and improved myocardial function in the inferior LV wall. We evaluated wall motion in RCA territory using QGS in the mid-term period after endoventricular circular patch plasty (EVCPP). Eighteen patients, who underwent ...
Husic Mirza - - 2005
To determine the relation between regional diastolic wall motion abnormality and left ventricular remodeling after acute myocardial infarction (AMI), Doppler echocardiography and color kinesis with assessment of global and regional systolic and diastolic functions were performed in 84 patients who developed AMI within 24 hours of admission. In a multivariate ...
Kondo Chisato - - 2005
OBJECTIVE: The feasibility of human cardiac imaging using a prototype 256-detector row cone-beam computed tomography (256CBCT) scanner without electrocardiographic gating was examined. METHODS: Two healthy male volunteers were examined by contrast-enhanced 256CBCT. The number of detectors was 912 x 256, each measuring approximately 0.5 mm x 0.5 mm at the ...
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