Search Results
Results 301 - 350 of 1028
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Loeb Henry S - - 2007
OBJECTIVE: To determine if T-wave normalization during exercise or dobutamine stress testing identified patients with myocardial ischemia as indicated by reversible perfusion defects. METHODS: Exercise or dobutamine stress tests with perfusion scintigraphy were performed in 1,173 patients with abnormal T-waves on their baseline electrocardiograms. The results of perfusion scintigraphy were ...
Elliott Perry - - 2007
Hypertrophic cardiomyopathy is a common genetically transmitted disease, defined clinically by the presence of left ventricular hypertrophy in the absence of loading conditions sufficient to cause the observed degree of hypertrophy. The disease has a heterogeneous clinical course, with many patients having few cardiovascular symptoms and others profound exercise limitation ...
Popović Z B - - 2008
BACKGROUND: Heart failure patients who are candidates for CRT frequently display longitudinal rotation (LR) - a swinging motion of the heart when imaged in a horizontal long-axis plane. OBJECTIVES: To identify the magnitude and predictors of LR in patients with ischaemic (ICM) and idiopathic dilated (DCM) cardiomyopathy, and to assess ...
Magrì Damiano - - 2007
BACKGROUND: Despite recent progress in iron chelation therapy, sudden cardiac death due to malignant ventricular arrhythmias remains a vexing, clinical problem in patients with beta-thalassemia major (TM). In this study we assessed whether the major indices of QT variability, emerging tools for risk stratification of sudden cardiac death, differ in ...
Melacini Paola - - 2008
BACKGROUND: Recurrent myocardial ischemia has been recognized as playing an important role in the pathophysiology of hypertrophic cardiomyopathy (HCM) and cardiovascular magnetic resonance (CMR), with or without gadolinium, is a promising method of evaluating fibrosis, edema and hypoperfusion. The aim of this study is to evaluate the interrelationship between late ...
Dimitrow Paweł Petkow - - 2008
AIM: To assess the extent of hyperenhancement in hypertrophic cardiomyopathy (HCM) patients with nonsustained ventricular tachycardia (NSVT) in comparison to patients without NSVT. DESIGN: In HCM patients, NSVT in Holter monitoring is a risk factor for sudden cardiac death; however, its positive predictive value is low. Varying risk of sudden ...
Dovgalyuk Jacqueline - - 2007
Syncope is a common and challenging presentation for the emergency physician. Various investigators have developed clinical risk score and clinical decision rules which are designed to identify the population at highest risk for adverse events. In each of these clinical decision tools, the electrocardiogram (ECG) is one of the key ...
Innasimutthu Anthony Leslie - - 2007
To study the relation between troponin positive acute coronary syndrome (ACS) and electrocardiogram (ECG) changes on admission. METHODS: It was a prospective cohort study looking at patients admitted to the Heart Assessment Center over a period of a month, who were suspected to have an ACS. There were 126 patients ...
Pretorius Elmo - - 2007
OBJECTIVE: The aim of this preliminary study was to determine the prevalence of isolated ST-elevation in the right precordial leads and the potential impact the addition had to risk stratification in patients with acute coronary syndrome. METHODS: Right-sided precordial leads (V4R, V5R and V6R) were routinely added to standard 12-lead ...
Poole-Wilson Philip A - - 2007
The idea that patients who have dilated cardiomyopathy (presumably a large heart with near-normal coronary arteries) must have a trial of bridge to recovery is risible. Many such patients should be managed so that they go directly to transplantation and others may be better treated with drug therapy. Some may ...
Yeragani Vikram Kumar - - 2007
BACKGROUND: Some studies suggest that it is important to take the end of "T" wave to quantify QT-interval variability, which signifies cardiac repolarization lability, as there is substantial and important information beyond the peak of the T wave on the surface electrocardiogram. METHODS: In this study, we examined the relationship ...
Holmqvist Fredrik - - 2007
BACKGROUND: Patients with hypertrophic cardiomyopathy (HCM) have a high incidence of atrial fibrillation. They also have a longer P-wave duration than healthy controls, indicating conduction alterations. Previous studies have demonstrated orthogonal P-wave morphology alterations in patients with paroxysmal atrial fibrillation. In the present study, the P-wave morphology of patients with ...
Matveev Mikhail - - 2007
OBJECTIVE: The signal-averaged electrocardiography (SAECG) is known to be a useful tool for extraction and analysis of low-amplitude signal components. We found SAECG may be useful for precise location of the site of the myocardial necrosis and assessment of the severity of impaired left ventricular systolic function of patients with ...
Bozkaya Yasemin Turan - - 2007
OBJECTIVE: Torsades de pointes (TdP) during bradyarrhythmias have been reported to be associated with gender, degree of QT prolongation and duration of bradyarrhythmia. We sought to investigate the repolarization characteristics on 12-lead electrocardiogram (ECG) and the incidence of TdP in patients with acquired complete atrioventricular block (CAVB). METHODS: Fifty consecutive ...
Scirica Benjamin M - - 2007
AIMS: To determine the relationship between a strategy of enoxaparin (ENOX), early ST-segment resolution (STRes), and clinical outcomes on patients with ST-segment elevation myocardial infarction (STEMI) after fibrinolysis. METHODS AND RESULTS: Baseline and 180 min ECGs were analysed in 3208 of the 20 479 patients in the ExTRACT-TIMI 25 trial, ...
Creutzig Ursula - - 2007
BACKGROUND: Anthracyclines are effective antineoplastic drugs in acute myelogenous leukemia (AML). However, their use is limited by cardiomyopathy, which occurs in children already at cumulative doses of 300 mg/m(2) (given as daunorubicin equivalent). PROCEDURE: To evaluate anthracycline-associated cardiomyopathy in pediatric AML-patients, the incidence of early and late (>1 year after ...
Kurowski Volkhard - - 2007
BACKGROUND: The frequency and potential differences between patients with apical ("typical") and midventricular ("atypical") ballooning have not been described. METHODS: Consecutive patients with the diagnosis of a troponin-positive acute coronary syndrome (ACS) were prospectively included into a registry (n = 3,265). Of those, 2,944 patients underwent left-heart catheterization and form ...
Mizumaki Koichi - - 2007
INTRODUCTION: In patients with Brugada syndrome, the circadian variation of ST elevation could be modulated by the autonomic nervous activity and RR interval. Recently, glucose-induced insulin secretion was also reported to contribute to fluctuation of ST elevation. Therefore, we assessed the effects of taking meals on the ST-RR relationship in ...
Fazio Giovanni - - 2008
BACKGROUND: Takotsubo cardiomyopathy is a disorder that has been appreciated only recently. In most of reported cases, this syndrome mimes an acute myocardial infarction. Till this moment no data are available from literature about the treatment in the acute phase of this disease. AIM OF THE STUDY: In our multicentric ...
Théraulaz Damien - - 2007
AIM: This study was conducted to assess the clinical value of the 12-lead electrocardiogram (ECG) for the diagnosis of previous myocardial infarction (MI) in permanently paced patients. METHODS: A total of 107 unselected patients with permanent pacemakers were retrospectively studied and divided into 3 groups: group 1 (control group): 38 ...
Williams Lynne - - 2007
Hypertrophic cardiomyopathy (HCM) is an inherited disease with marked phenotypic variability that includes the extent of hypertrophy, the presence and severity of symptoms, and the natural history of the disease. Symptoms of impaired consciousness (syncope and pre-syncope) occur in approximately 15-25% of patients with hypertrophic cardiomyopathy (HCM). In young patients ...
Dursunoglu Dursun - - 2007
OBJECTIVES: Delayed cardiac repolarization leading to prolongation of the QT interval is a well-characterised precursor of arrhythmias. Obstructive sleep apnea (OSA) might cause arrhythmias, since QT corrected interval dispersion (QTcd) is increased in these patients. We aimed to determine the effect of nasal continuous positive airway pressure (CPAP) therapy on ...
Mitsuma Wataru - - 2007
This study aimed to clarify detailed and serial electrocardiographic findings in patients with Takotsubo cardiomyopathy from onset to recovery. Nine consecutive women aged 65 to 84 years (mean 74) with Takotsubo cardiomyopathy were investigated. Standard 12-lead electrocardiograms were recorded during hospitalization and ST-segment elevation and T-wave inversion were manually measured ...
Watanabe Eiichi - - 2007
BACKGROUND: In patients with chronic heart failure (CHF), circadian variability of RR and QT intervals may be altered because of neurohumoral activation and functional and structural remodeling of the heart. OBJECTIVE: The aim of this study was to evaluate the prognostic significance of circadian variability of the RR and QT ...
Lipton Jonathan A - - 2008
INTRODUCTION: ECG stress testing is an inexpensive and non-invasive detector of myocardial ischemia; addition of high-frequency QRS analysis (HFQRS) may improve accuracy. This study compared HFQRS during exercise in patients with and without ischemia as defined by multiple criteria. MATERIAL AND METHODS: High-resolution ECGs were recorded for 139 patients undergoing ...
Breidthardt Tobias - - 2007
To quantify the prognostic utility of QRS and QTc interval prolongation in patients presenting with acute destabilised heart failure (ADHF) to the emergency department (ED). Prospective cohort study among patients enrolled in the B-Type Natriuretic Peptide for Acute Shortness of Breath Evaluation (BASEL) study. QRS and QT intervals were measured ...
Bigi Mohammad Ali Babaee - - 2007
AIMS: Brugada syndrome is a cardiac channel abnormality that is associated with a high risk of ventricular fibrillation and sudden cardiac death and characterized by an electrocardiographic pattern of right bundle branch block and transient or persistent ST-segment elevation in leads V1-V3. No data regarding the frequency of Brugada syndrome ...
Kenigsberg David N - - 2007
OBJECTIVES: In order to more clearly understand the electrocardiographic manifestations of early transmural ischemia, we studied electrocardiograms (ECGs) in patients undergoing balloon angioplasty. BACKGROUND: Decisions regarding reperfusion strategies in patients with acute myocardial infarction rely largely on the presence of ST-segment elevation (STE) in the ECG, consequently with significant limitations. ...
Yue Wei - - 2007
Ambient particulate air pollution has been associated with altered cardiac function and systemic inflammation. We reported repolarization changes and variations in markers of inflammation in association with ambient particulate exposure in a panel of male coronary artery disease (CAD) patients. The objective of this analysis was to identify the specific ...
Ciftci Orcun - - 2007
BACKGROUND: Cardiac involvement in scleroderma is a poor prognostic sign and is usually underdiagnosed, particularly in asymptomatic patient. This paper focuses on QT dynamicity and heart rate variability (HRV) in patients with scleroderma and controls in an attempt to investigate the cardiac autonomic system and ventricular repolarization. METHODS: Sixty patients ...
Voss Andreas - - 2007
Dilated cardiomyopathy (DCM) has an incidence of about 20100 000 new cases per annum and accounts for nearly 10 000 deaths per year in the United States. Approximately 36% of patients with dilated cardiomyopathy (DCM) suffer from cardiac death within five years after diagnosis. Currently applied methods for an early ...
Restier-Miron Lioara - - 2007
BACKGROUND AND PURPOSE: If only a standard electrocardiogram (ECG) is available, at least 25% of patients with long QT syndrome (LQTS) may be missed. Our goal is to quantify abnormal electrical activity and to develop an ECG decision rule for the patients with LQTS. METHODS: One hundred forty-one subjects were ...
Frustaci Andrea - - 2007
AIM: We sought to determine whether myocarditis can be a major cause of acute electrical instability or clinical deterioration in HCM patients. METHODS AND RESULTS: A total of 119 HCM patients (69 M/50F, mean age 41 +/- 8), 42 with acute clinical deterioration and 77 clinically stable, underwent cardiac catheterization ...
Klimczak Artur - - 2007
The population of patients with a pacemaker is constantly growing in number. Myocardial infarction in these patients, like in patients with left bundle branch block (LBBB), is called the undetermined type and characterizes the highest risk of death. Therefore the early and correct diagnosis of AMI is very important. The ...
Pierre Bertrand - - 2007
BACKGROUND: In Brugada syndrome (BSY), most of the ventricular arrhythmic events are nocturnal, suggesting an influence of the autonomic nervous system. METHODS: In 46 patients (mean age = 41 +/- 14 years, 43 men) with electrocardiograms (ECG) consistent with BSY and structurally normal hearts, we measured heart rate variability (HRV) ...
Takagi Masahiko - - 2007
Brugada syndrome is an arrhythmogenic disease characterized by an ECG pattern of coved-type ST segment elevation in the right precordial leads and an increased risk of sudden cardiac death (SCD) as a result of polymorphic ventricular tachyarrhythmia or ventricular fibrillation (VF). Data from large patient studies and a meta-analysis of ...
Rashidi Arash - - 2007
BACKGROUND: Chronic kidney disease (CKD) is one of the known risk factors for coronary heart disease (CHD). Though electrocardiograms (ECGs) have limited accuracy in determining the true prevalence of CHD, we wondered whether CKD and diabetes mellitus (DM) controlled for hypertension (HTN), had similar prevalences of ECG abnormalities that could ...
Hegazy Ranya A - - 2007
Holter monitoring (HM) has been established as one of the most effective noninvasive clinical tools in the diagnosis, assessment and risk stratification of cardiac patients. However, studies in the pediatric age group are limited. The present work aims at determining the value of HM in the diagnosis and management of ...
Ulger Zulal - - 2006
Cardiac complications are considered to be the primary cause of death in patients with beta thalassaemia major. QT dispersion is a marker variability of ventricular repolarization and is elevated in various high risk groups of patients. This study was carried out in patients with beta thalassaemia major to evaluate QT ...
Pinheiro Martina B - - 2007
No previous study has examined the association of clinical variables and QTc interval dispersion in patients with Chagas-Hypertensive cardiomyopathy. Sixty-four patients with Chagas-Hypertensive cardiomyopathy were entered for the study. Seventy-one chronic Chagas' disease heart failure patients and 68 patients with Hypertensive cardiomyopathy heart failure were used in the comparison of ...
Drigo Sandra A - - 2007
One third of Trypanosoma cruzi-infected individuals develop chronic Chagas disease cardiomyopathy (CCC) while the majority remains asymptomatic (ASY). About 30% of CCC patients develop heart failure due to end-stage inflammatory dilated cardiomyopathy. Increased production of tumor necrosis factor (TNF)-alpha has been described in all clinical forms of Chagas disease, and ...
Piotrowicz Katarzyna - - 2007
This study compared different measurements of repolarization duration in patients after infarction with and without conduction disturbances and evaluated the prognostic significance of repolarization parameters for predicting mortality in patients with conduction abnormalities. The study population consisted of 3,282 patients after recent myocardial infarction. Repolarization duration was measured using Bazett ...
Argüero Rubén - - 2006
BACKGROUND: Heart failure is highly prevalent among patients >65 years old. The incidence increases starting at approximately 45 years of age. Recent therapeutic advances have included stem cell transplantation in the affected areas of the myocardium in order to improve perfusion and myocardial performance. METHODS: Between July 13, 2004 and ...
Sakai Yumiko - - 2006
It has recently been reported that insulin resistance is prevalent in patients with dilated cardiomyopathy (DCM); however, it remains unclear whether insulin resistance is directly induced by DCM or if it is caused by congestive heart failure associated with DCM. We evaluated homeostasis model assessment insulin resistance (HOMA-R) in 14 ...
Fatti Letizia Maria - - 2006
OBJECTIVE: Cardiovascular disease is a major contributor to the increased mortality of acromegalic patients. Prolongation of the QT interval is considered an established risk factor for potentially fatal cardiac arrhythmias, an event frequently observed in acromegaly. Changes in ventricular repolarization have been observed with the use of octreotide, one of ...
de Souza Dilma - - 2007
BACKGROUND: Hypothermia is defined as a condition in which core temperature (rectal, esophageal, or tympanic) reaches values below 35 degrees C. This may be accidental, metabolic, or therapeutic. The accidental form is frequent in cold-climate countries and rare in those with tropical or subtropical climate. The aim of this study ...
Paavonen Kristian J - - 2007
BACKGROUND: The most prevalent LQT1 form of inherited long QT syndrome is caused by mutations of the KCNQ1 gene resulting repolarizing I(Ks) potassium current to decrease and the QT interval to prolong. As abrupt sympathetic activation triggers ventricular arrhythmias that may cause syncopal attacks and sudden death in LQT1 patients, ...
Ono Takuya - - 2006
BACKGROUND: Total cosine R-to-T (TCRT) is a descriptor of T-wave morphology analysis based on singular value decomposition of 12-lead electrocardiograms (ECGs), which is useful in risk stratification of patients with myocardial infarction (MI). A new marker of standard ECG substituted for TCRT is proposed and the aim of this study ...
Veltmann Christian - - 2006
AIMS: Fluctuations between the diagnostic ECG pattern and non-diagnostic ECGs in patients with Brugada syndrome are known, but systematic studies are lacking. The purpose of this study was to prospectively evaluate the spontaneous ECG changes between diagnostic and non-diagnostic ECG patterns in patients diagnosed with Brugada syndrome. METHODS AND RESULTS: ...
Goldberger Jeffrey J - - 2006
OBJECTIVES: We sought to evaluate whether statins were associated with a survival benefit and significant attenuation in life-threatening arrhythmias in patients with nonischemic dilated cardiomyopathy. BACKGROUND: Statins are associated with a reduction in appropriate implantable cardioverter-defibrillator (ICD) therapy in patients with coronary artery disease and improved clinical status in nonischemic ...
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