Search Results
Results 351 - 400 of 1384
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Varga Albert - - 2005
BACKGROUND: Stress echocardiography is a cost-effective tool for the modern noninvasive diagnosis of coronary artery disease. Several physical and pharmacological stresses are used in combination with echocardiographic imaging, usually exercise, dobutamine and dipyridamole. The safety of a stress is (or should be) a major determinant in the choice of testing. ...
Amà R - - 2005
This study was performed to determine whether preload-adjusted peak power can act as a surrogate for preload-adjusted maximal power in the assessment of left ventricular performance in the clinical setting. Ninety-nine consecutive patients who had undergone elective coronary artery bypass grafting were studied. Fifty-five of these patients were divided into ...
Yao Siu-Sun - - 2005
The noninvasive assessment of myocardial viability has proved clinically useful for distinguishing hibernating and/or stunned myocardium from irreversibly injured myocardium in patients with chronic ischemic heart disease or recent myocardial infarction, with marked regional and/or global left ventricular (LV) dysfunction. Noninvasive techniques utilized for the detection of viability in asynergic ...
Winter Reidar - - 2005
Myocardial contrast echocardiography using power modulation real-time perfusion (RTP) is an appealing method for bedside risk stratification of patients with acute coronary syndrome. In this study, we aimed to evaluate the accuracy in predicting significant coronary stenosis of a bedside RTP adenosine stress protocol in patients with acute coronary syndrome. ...
Saha Samir - - 2005
AIMS: To evaluate the diagnostic capacity of quantitative analysis of segmental longitudinal myocardial displacement images (tissue tracking, TT) during dobutamine stress echocardiography for the detection of patients with coronary artery disease (CAD). METHODS AND RESULTS: TT-generated colour-coded maps of systolic segmental longitudinal displacement were obtained by post-processing of echocardiographic data ...
Sicari Rosa - - 2005
In the present article we review the main published data on the application of Tissue Doppler Imaging (TDI) to stress echocardiography for the detection of myocardial ischemia. TDI has been applied to stress echocardiography in order to overcome the limitations of visual analysis for myocardial ischemia. The introduction of a ...
Wu Yen-Wen - - 2005
BACKGROUND: The aim of the study was to investigate the value of longitudinal follow-up of dobutamine thallium-201 single photon emission tomography ((201)Tl SPECT) in the development of significant cardiac allograft vasculopathy (CAV) after orthotopic heart transplantation. METHODS: We studied 38 cardiac recipients (mean age 57 +/- 12 years) who underwent ...
Meimoun Patrick - - 2005
Left ventricular outflow tract obstruction related to systolic anterior motion of the mitral valve (SAM) induced during dobutamine stress echocardiography (DSE) is not unusual but its significance is not established. A total of 100 consecutive patients (mean age 62 +/- 12 years; 67% male) without previous transmural myocardial infarction, valvular ...
Otasević Petar - - 2005
This study was designed to determine the relationship between histomorphometric features and contractile reserve assessed by high-dose dobutamine stress echocardiography in patients with idiopathic dilated cardiomyopathy. Twenty-four consecutive patients (21 men, aged 43.4+/-8.7 years) with idiopathic dilated cardiomyopathy underwent dobutamine stress echocardiography. Wall motion score index, ejection fraction, cardiac power ...
Cortigiani Lauro - - 2005
The prediction of functional recovery or ventricular remodeling plays a central role in the prognostic assessment of acute myocardial infarction (MI) in the reperfusion era. This article reviews the advances of echocardiographic techniques, focusing on the role of low-dose dobutamine stress echocardiography, contrast echocardiography, transthoracic Doppler of the left anterior ...
Ismailov Rovshan M - - 2005
BACKGROUND: Blood viscosity is fundamentally important in clinical practice yet the apparent viscosity at very low shear rates is not well understood. Various conditions such as blunt trauma may lead to the appearance of zones inside the vessel where shear stress equals zero. The aim of this research was to ...
Hui L - - 2005
OBJECTIVES: To use dobutamine stress echocardiography to determine left ventricular (LV) function and wall motion of children long term after arterial switch operation (ASO) for transposition of the great arteries. DESIGN AND PATIENTS: 31 patients (24 boys) with ASO performed at a mean (SD) of 15.5 (4.3) days of life ...
Gligorova Suzana - - 2005
High-rate pacing is a valid stress test to be used in conjunction with echocardiography; it is independent of physical exercise and does not require drug administration. There are two main applications of pacing stress in the echo lab: the noninvasive detection of coronary artery disease through induction of a regional ...
Rigo Fausto - - 2005
The assessment of coronary flow reserve by transthoracic echocardiography has recently been introduced into clinical practice with gratifying results for the diagnosis of left anterior descending artery disease simultaneously reported by several independent laboratories. This technological novelty is changing the practice of stress echo for 3 main reasons. First, adding ...
Chaowalit Nithima - - 2004
Chronotropic response is important during exercise stress testing. Less is known about its role after dobutamine stress echocardiography. In addition, limited information exists regarding the long-term prognostic value of dobutamine stress echocardiography in patients who have peripheral arterial disease. We studied 2,138 patients who had peripheral arterial disease (1,317 men, ...
Elhendy Abdou - - 2004
OBJECTIVE: This study sought to compare the accuracy of myocardial contrast echocardiography (MCE) and wall motion analysis (WMA) during submaximal and peak dobutamine stress echocardiography (DSE) for the diagnosis of coronary artery disease (CAD). BACKGROUND: The relative merits of MCE and WMA for the detection of CAD during DSE have ...
Elhendy Abdou - - 2004
Acute myocardial infarction is a rare complication of dobutamine stress echocardiography (DSE). We described angiographic findings of a patient who developed acute inferior ST segment elevation myocardial infarction 2h after a normal dobutamine stress echocardiogram. The patient failed thrombolysis and underwent coronary angiography, which showed 60% stenosis of proximal right ...
Nixdorff Uwe - - 2004
Myocardial viability within the infarct zone is an important determinant for left ventricular (LV) function recovery after interventional coronary revascularization. Echocardiographic techniques are highly valuable in identifying hibernation, especially in conjunction with dobutamine titration. Low doses may detect the inotropic reserve by significant enhancement of segmental wall motion abnormalities while ...
Nanas John N - - 2004
A 24-hour infusion of levosimendan was added to dobutamine in 18 patients (aged 63 +/- 9 years) hospitalized for management of decompensated New York Heart Association functional class IV heart failure refractory to a continuous 24-hour infusion of dobutamine (10 microg/kg/min) and furosemide (10 mg/hour); the primary study end point ...
Elhendy Abdou - - 2004
BACKGROUND: Our objective was to assess the prognostic value of the scintigraphic extent of coronary artery disease on stress technetium 99m tetrofosmin single photon emission computed tomography in patients with previous myocardial infarction. METHODS AND RESULTS: We studied 383 patients (280 men and 103 women; mean age, 60 +/- 11 ...
Bacal Fernando - - 2004
BACKGROUND: Cardiac allograft vasculopathy (CAV) remains the major cause of death after cardiac transplantation during long-term follow-up. Nevertheless, annual angiographic evaluation is difficult to perform routinely. We evaluated the value of clinical risk factors and non-invasive testing for cardiac allograft vasculopathy in predicting cardiac events or death in asymptomatic patients ...
Yoshinaga Keiichiro - - 2004
The recovery of function in myocardium defined as viable by (18)F-FDG PET may differ from that defined by dobutamine stress echocardiography (DSE). The aim of this study was to investigate the difference in the oxidative metabolic response between myocardial segments with preserved contractile reserve (CR) and those without CR, in ...
Croteau Etienne - - 2004
The purpose of this study was to evaluate the effects of 2 anesthetic agents on myocardial perfusion and coronary reserve in rats under resting and stress conditions with small animal PET. METHODS: Twenty-four rest/stress studies were performed in 6 rats. Each animal received all 4 possible combinations of anesthetic agents ...
Krenning Boudewijn J - - 2004
BACKGROUND: Dobutamine stress echocardiography (DSE) is an accepted test for the diagnosis of coronary artery disease (CAD), despite its wide diagnostic accuracy. AIM: Which factors cause test variability of DSE for the diagnosis of CAD. METHODS: In a retrospective analysis of 46 studies in 5,353 patients, the potential causes of ...
Yip Gabriel - - 2004
OBJECTIVES: This study was designed to determine whether strain echocardiography parameters reflect changes in regional myocardial perfusion during dobutamine stress. BACKGROUND: Strain echocardiography depicts regional myocardial mechanical activity. Ischemia has been shown to reduce systolic strain rate (sSR) and prolong the time to regional lengthening (T(RL)). In an experimental model, ...
Sainz I - - 2004
Atherosclerosis is a general health problem that not only affects the coronary arteries but also (in men) the penile arteries, thus contributing to organic causes of erectile dysfunction (ED) in heart disease patients. These organic causes are intertwined with psychological and pharmacological causes because medication prescribed for heart disease patients ...
Dabu-Bondoc Susan M - - 2004
PURPOSE OF REVIEW: This review of the most recent publications is aimed to look at the current developments regarding the effects of regional anesthesia on perioperative outcome. RECENT FINDINGS: The debate continues on whether regional anesthesia and analgesia improve outcome or not. Researchers are still divided in their views. While ...
Afanas'ev S A - - 2004
We studied myocardial biopsy specimens from the right atrium of cardiological patients with different degree of cardiac ischemia obtained during surgery. No inducible HSP70 stress proteins were detected in atrial cardiomyocytes of patients with the WPW syndrome without signs of ischemic injuries of the heart. These proteins were detected in ...
Duncan Alison - - 2004
OBJECTIVE: In patients with coronary artery disease (CAD), the normal electromechanical response to dobutamine stress is deranged: QRS duration lengthens rather than shortens, left ventricular asynchrony develops, post-ejection shortening appears, and total isovolumic time (the time in the cardiac cycle when the ventricle is neither ejecting nor filling) increases rather ...
Gowda Ramesh M - - 2004
Echocardiography provides information regarding cardiac morphology, function and hemodynamics non-invasively. It is the most frequently performed cardiovascular examination after electrocardiography and chest X-ray. In less than half a century, this technique has evolved to a mainstay of cardiovascular medicine. The historical evolution of echocardiography is succinctly described including that of ...
Sozzi Fabiola B - - 2004
Currently, there are no outcome data to suggest an incremental value of stress echocardiography in the risk stratification of patients who have hypertension after controlling for the left ventricular mass index (LVMI). This study assessed the incremental value of dobutamine stress echocardiography (DSE) for the prediction of mortality rate and ...
Puddu Paolo Emilio - - 2004
BACKGROUND: Dobutamina Studio Italiano Multicentrico (Do.S.I.M.) is a prospective, randomized, multicenter interuniversity Italian study aimed at assessing the effects of dobutamine on spontaneous variability of ventricular arrhythmias in sinus rhythm NYHA class III-IV patients with congestive heart failure (CHF). METHODS: Out of 74 pre-hoc estimated CHF patients, 68 (92%) were ...
Oyama Mark A - - 2004
Echocardiography is an exceptionally useful technique for diagnosing cardiovascular disease in small animals. It is noninvasive and provides a wealth of data concerning cardiac morphology and function. For many patients, echocardiography is the definitive diagnostic tool. A well-performed study coalesces the findings of the physical examination, electrocardiogram, and radiographs into ...
Kashtanov Sergei I - - 2004
The influence of stress on cardiac electrical stability (CES) and chaotic dynamics of the electrical activity of the heart was studied in acute and chronic experiments in rabbits. Stress was caused by 2-3 h daily immobilization of the animals with electrical stimulation of emotiogenic centers of the hypothalamus through implanted ...
Yokoshima Tomoko - - 2004
OBJECTIVES: Prediction of perioperative cardiac events associated with noncardiac surgery remains difficult in patients whose functional capacity cannot be evaluated by exercise testing. Dobutamine stress echocardiography (DSE) has been used in these patients to improve risk stratification, but the results of standard DSE provide only a binary index of risk ...
Leung Jacqueline M - - 2004
To determine the contractile reserve of the left ventricle during reperfusion as a predictor of myocardial viability in patients undergoing coronary artery bypass graft surgery, we measured the response of left ventricular regional wall motion and thickening by using dobutamine stress echocardiography (DSE) after myocardial revascularization. All patients were monitored ...
Korosoglou Grigorios - - 2004
Little is known about the diagnostic value of real-time myocardial contrast echocardiography (MCE) for the assessment of myocardial viability. We compared the diagnostic accuracy of MCE with that of low-dose dobutamine stress echocardiography (DSE) and of combined technetium-99 sestamibi single-photon emission computed tomography and fluorodeoxyglucose-18 positron emission tomography and investigated ...
Hosokawa Ryohei - - 2005
PURPOSE: 123I-(p-iodophenyl)-3-(R,S)-methylpentadecanoic acid (123I-BMIPP) is a fatty acid analog for single-photon emission computed tomography (SPECT) imaging that is mainly stored in the triglyceride pool. Low-dose dobutamine infusion has been reported to improve BMIPP uptake in the stunned myocardium, but the mechanism underlying this effect remains unclear. The purpose of this ...
Paetsch I - - 2004
BACKGROUND: Dobutamine stress MR (DSMR) is highly accurate for the detection of inducible wall motion abnormalities (IWMAs). Adenosine has a more favorable safety profile and is well established for the assessment of myocardial perfusion. We evaluated the diagnostic value of IWMAs during dobutamine and adenosine stress MR and adenosine MR ...
Paul B - - 2004
Dobutamine stress echocardiography is often used as a non-invasive diagnostic modality for detection of coronary artery disease. In terms of accuracy it rivals SPECT scintigraphy. Application of non-coronary artery disease has made it an attractive diagnostic tool. However, like all diagnostic modalities it has its inherent limitations. Quantitation of stress ...
Kuijpers Dirkjan - - 2004
The aim of this study was to determine the prognostic value of dobutamine cardiovascular magnetic resonance (CMR) in patients suspected of myocardial ischemia. Clinical data and dobutamine-CMR results were analyzed in 299 consecutive patients. Follow-up data were analyzed in categories of risk levels defined by the history of coronary artery ...
Kuijpers Dirkjan - - 2004
The aim of the study was to evaluate safety and feasibility of dobutamine cardiovascular magnetic resonance (CMR) in patients with proven or suspected coronary artery disease. Dobutamine CMR was evaluated retrospectively in 400 consecutive patients with suspicion of myocardial ischemia. Dobutamine was infused using an incremental protocol up to 40 ...
Labib Sherif B - - 2004
OBJECTIVES: This study sought to evaluate the negative predictive value (NPV) of preoperative dobutamine stress echocardiography (DSE) in patients who fail to achieve target heart rate (HR) and assess the influence of resting wall motion abnormalities (WMAs) without demonstrable ischemia on perioperative events. BACKGROUND: The prognostic value of a negative-submaximal ...
Ben-Haim Simona - - 2004
OBJECTIVES: We have evaluated left ventricular ejection fraction (LVEF) at rest (REF) and after stress (SEF) with dual-isotope gated myocardial perfusion SPECT (GMPS) with 201Tl injected at rest and 99mTc sestamibi (99mTc-MIBI) injected at peak stress, to assess the occurrence of post-stress stunning. METHODS: Two hundred and thirty-six consecutive patients ...
Morello Mara - - 2004
BACKGROUND: Successful reperfusion therapy in patients with acute myocardial infarction (AMI) improves survival. Indeed, after AMI myocardial dysfunction may be reversible (hibernating or stunned myocardium). Low-dose dobutamine stress echocardiography (LDDSE) provides us with the possibility of evaluating viable myocardial segments, while myocardial contrast echocardiography (MCE) allows the study of the ...
Janssen J A M J L - - 2004
It has previously been suggested that ghrelin mediates GH-independent biologic activities on the heart. We investigated the acute effects on cardiac contraction of a single iv administration of human ghrelin (in a dose of 1 microg/kg) in severe untreated GH deficient subjects. Prior to the ghrelin infusion, an echocardiographic examination ...
Schinkel Arend F L - - 2004
PURPOSE: To compare the long-term prognostic value of dobutamine stress echocardiography and dobutamine stress single photon emission computed tomography (SPECT) in patients unable to perform an exercise test. METHODS: We assessed the prognostic value of dobutamine stress technetium 99m ((99m)Tc)-sestamibi SPECT and dobutamine stress echocardiography in 301 patients who were ...
Nørager Betina - - 2004
BACKGROUND: Wall-motion analysis during low-dose dobutamine echocardiography (LDDE) is a semiquantitative measure of left ventricular contractile reserve after myocardial infarction (MI). The Doppler echocardiographic myocardial performance index (MPI) is a quantitative measure of combined left ventricular systolic and diastolic function. We sought to characterize the changes in MPI during LDDE ...
Wahl Andreas - - 2004
AIMS: To determine the safety of high-dose dobutamine-atropine stress cardiovascular magnetic resonance (stress-CMR), which recently emerged as a highly accurate modality for diagnosis of inducible myocardial ischaemia. METHOD AND RESULTS: From 1997 to 2002, 1000 consecutive stress-CMR examinations were performed. Images were acquired at rest and during a high-dose dobutamine-atropine ...
White D Jean - - 2004
OBJECTIVE: This study was designed to determine whether cutaneous burn injury up-regulated expression of myocardial heat shock protein (HSP)70 and to determine a potential cardioprotective role of inducible HSP70 (iHSP70) in postburn myocardial contractile function. DESIGN: Experimental study. SETTING: Research laboratory. SUBJECTS: Adult Hartley guinea pigs. INTERVENTIONS: The first set ...
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