Search Results
Results 651 - 700 of 1902
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Markiewicz-Łoskot Grazyna - - 2009
BACKGROUND: Mitral valve prolapse (MVP) is the most common primary valvular abnormality in a young population. In some individuals, MVP is silent or associated with palpitations, dizziness, chest pain, and abnormal electrocardiogram (ECG) repolarization with or without ventricular arrhythmias. HYPOTHESIS: The aim of the present study was to assess the ...
Salcido David D - - 2009
BACKGROUND: Quantitative measures of the ventricular fibrillation (VF) electrocardiogram (ECG) have been correlated with the success of rescue shocks, making them ideal measures for guiding resuscitative interventions. Correlation of intramyocardial energy stores with the change in quantitative VF ECG measures would provide mechanistic insight into their utility. We sought to ...
Madias John E - - 2009
Attenuation of the QRS voltage (QRSV) in patients with decompensated heart failure (HF) has been known for a long time, but its mechanism has been elusive. In a canine model of HF, QRSV was seen in intracardiac and epicardial electrograms (ECGs), but no surface ECGs were recorded in that study ...
Chiavistelli Patrizio - - 2009
Abnormal ST T-wave changes can be found at presentation in various noncoronary disorders; misinterpretation of these patterns as ischemic heart disease can lead to erroneous diagnosis and treatment. Here we present a case of myasthenia gravis (MG) with thymoma, in which the resting electrocardiogram (ECG) led to a misleading diagnosis ...
Erice B - - 2009
Differences in the diagnostic value of various electrocardiographic (ECG) voltage indices for hypertrophic cardiomyopathy (HCM) are yet to be elucidated. The objective of this study was to examine the strongest predictor within ECG voltage criteria for left ventricular hypertrophy (LVH) in HCM to be applied in cardiovascular examination of young ...
Jayachandran E S - - 2010
Myocardial infarction (MI), is commonly known as a heart attack, occurs when the blood supply to the portion of the heart is blocked causing some heart cells to die. This information is depicted in the elevated ST wave, increased Q wave amplitude and inverted T wave of the electrocardiogram (ECG) ...
Noda Takashi - - 2009
Evaluation of: Sudden cardiac arrest associated with early repolarization. Haiissaguerre M, Derval N, Saccher F et al.: N. Engl. J. Med. 358, 2016-2023 (2008). In patients with idiopathic ventricular fibrillation, several kinds of electrocardiographic findings have been reported. Brugada electrocardiogram (ECG), a coved-type ST-segment elevation in the right precordial leads, ...
Armstrong Paul W - - 2009
OBJECTIVES: We assessed the incremental value of baseline Q waves over time from symptom onset as a marker of clinical outcome in ST-segment elevation myocardial infarction (STEMI). BACKGROUND: Time from symptom onset is a central focus in STEMI patients. The presence of Q waves on the baseline electrocardiogram (ECG) has ...
Kim Han W - - 2009
BACKGROUND: Unrecognized myocardial infarction (UMI) is known to constitute a substantial portion of potentially lethal coronary heart disease. However, the diagnosis of UMI is based on the appearance of incidental Q-waves on 12-lead electrocardiography. Thus, the syndrome of non-Q-wave UMI has not been investigated. Delayed-enhancement cardiovascular magnetic resonance (DE-CMR) can ...
Maliepaard Dirk - - 2009
BACKGROUND: There is no consensus on the monitoring for rare but potentially serious cardiac adverse events associated with cholinesterase inhibitor drugs in the treatment of dementia. Different protocols have been proposed, with and without ECG examination. We surveyed an urban old age psychiatry service to investigate the variables that may ...
van der Vleuten Pieter A - - 2009
DESIGN: The data used for the present study were obtained as part of a clinical trial evaluating the effect of thrombus aspiration after primary percutaneous coronary intervention (PCI). SETTING: The study was conducted at a tertiary referral facility for primary PCI at a University Medical Center Groningen in The Netherlands. ...
Letsas Konstantinos P - - 2009
BACKGROUND: Previous studies have demonstrated a high incidence of atrial tachyarrhythmias (ATs) in patients with Brugada syndrome (BS). The present study aimed to investigate whether various 12-lead electrocardiogram (ECG) and electrophysiological parameters may help to differentiate subjects with a high probability to develop ATs. METHODS AND RESULTS: The clinical records ...
Chandra Preeti A - - 2009
A 70-year-old woman with extensive psychiatric history, including depression and bipolar disorder, and past medical history of mitral valve prolapse repair (3 years ago) was brought in from the psychiatry ward to the emergency department for evaluation of ECG changes following electroconvulsive therapy (ECT). ECG done after the procedure showed ...
Steriotis Alexandros Klavdios - - 2009
Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a cardiac disease characterized by progressive myocardial atrophy and fibrofatty replacement. Standard electrocardiograms (ECGs) and signal-averaged ECGs (SAECGs) were relatively low cost and repeatable diagnostic tools. In this study, ECGs and SAECGs of patients with ARVC were analyzed with the aim to assess the ...
Korhonen Petri - - 2009
AIMS: Heterogeneous ventricular repolarization is associated with sudden cardiac death after myocardial infarction (MI). This prospective study investigated repolarization disparity with parameters based on T-wave morphology in body surface potential mapping (BSPM) in the assessment of arrhythmia risk in patients with a recent MI and cardiac dysfunction. METHODS AND RESULTS: ...
Gorgels Anton P M - - 2009
Recently, an important electrocardiogram picture indicating anterior wall ischemia was discussed, characterized by (1) loss of R wave and (2) not infrequently a notch in the negative limb of the QRS complexes in the precordial leads, combined with (3) ST depression and (4) a tall peaked T wave. An explanation ...
Park Chan Seok - - 2009
Percutaneous coronary intervention for chronic total occlusion lesions is technically difficult despite equipment advances. Changes in electrocardiographic patterns, such as Q and T waves, during chronic total occlusion can provide information about procedural success and myocardial viability. In this study, we investigated clinical, electrocardiographic, and procedural characteristics of chronic total ...
Ghista Dhanjoo N - - 2010
The electrocardiogram (ECG) is a representative signal containing information about the condition of the heart. The shape and size of the P-QRS-T wave, the time intervals between its various peaks, may contain useful information about the nature of disease afflicting the heart. However, these subtle details cannot be directly monitored ...
Yu Jian - - 2009
1. The purpose of the present study was to explore the relationship between electrocardiogram (ECG) patterns of right ventricular outflow tract (RVOT) premature ventricular contractions and the three-dimensional distribution of the target sites. 2. Thirty-three consecutive patients were included in the study. The target sites were identified by non-contact mapping ...
LaBounty Troy - - 2009
BACKGROUND: Q-waves in ST-elevation acute coronary syndromes carry adverse implications. We sought to determine the frequency, predictors, and implications of Q-waves in the current era that includes primary percutaneous coronary interventions. METHODS: There were 14,916 patients evaluated in a multicenter observational study. They presented with ST-elevation acute coronary syndromes between ...
Patanè Salvatore - - 2010
The prevalence of the Brugada-type ECG and its natural history are still unclear. The Brugada syndrome is usually identified by a characteristic Brugada-type ECG that consists of ST elevation of a coved type in the precordial leads V1 to V3 and ventricular fibrillation that can lead to sudden cardiac death, ...
Lumlertgul Suthaporn - - 2009
BACKGROUND: Attenuation of electrocardiogram (ECG) QRS complexes is observed in patients with a variety of illnesses and peripheral edema (PERED), and augmentation with alleviation of PERED. Serial ECGs in stable individuals display variation in the amplitude of QRS complexes in leads V1-V6, stemming from careless placement of recording electrodes on ...
Dota Corina-Dana - - 2009
BACKGROUND: PC-based ECG measurements must cope with normal as well as pathological ECGs in a reliable manner. EClysis, a software for ECG measurements was tested against reference values from the Common Standards for Quantitative Electrocardiography (CSE) database. METHODS: Digital ECGs (12 leads, 500 Hz) were recorded by the CSE project. ...
Farha Khalid Abou - - 2009
Myocardial injury is one of the most notorious complications of a hypertensive crisis. Key electrocardiograph signs used to detect cardiac injury such as ST segment changes and cardiac arrhythmias usually indicate acute ongoing end-organ damage. Lack of early signs to predict end-organ damage might lead to a delay in the ...
Karsikas Mari - - 2009
Principal component analysis of vectorcardio-graphic T-wave loop has been shown to be a potential tool to describe the abnormality of the cardiac repolarization and to predict cardiac events in patients with cardiac disease. In this paper a new method for estimating the non-planarity of the T-wave loop is introduced and ...
Sedkowska Agnieszka - - 2009
Microvolt T-wave alternans (MTWA) is a promising non-invasive method of evaluating repolarization abnormalities. Its presence is strongly related to the occurrence of malignant ventricular tachyarrhythmias and is therefore regarded as a risk marker for sudden cardiac death. Most recent studies have described the usefulness of MTWA in selecting patients who ...
Nenadic Ivan - - 2009
Stiffening of the left ventricle can compromise the ability of the heart to pump sufficient amounts of blood into the systemic circulation and could lead to heart failure. Quantifying mechanical properties of the left ventricular (LV) myocardium using a noninvasive technique would be of great benefit in clinical settings. We ...
Pislaru Cristina - - 2009
Diastolic properties of the myocardium are important for normal cardiac function and may contribute to the condition of heart failure. Measuring the viscoelastic properties of the left ventricular myocardium is difficult in vivo using noninvasive methods. In this study, we used a mechanical actuator to create harmonic, propagating mechanical waves ...
Venkitachalam Lakshmi - - 2009
Percutaneous coronary intervention (PCI) has undergone rapid progress, both in technology and adjunct therapy. However, documentation of long-term temporal trends in relation to contemporary practice is lacking. We analyzed PCI use and outcomes in 8976 consecutive patients in the multicenter, National Heart, Lung, and Blood Institute-sponsored 1985-1986 percutaneous transluminal coronary ...
Minns Alicia B - - 2010
Background: Marathon running has surged in popularity in the last quarter century. A small percentage of marathon runners develop increases of myocardial-specific markers with exercise, sometimes in the diagnostic range for acute myocardial infarction. A spectrum of abnormal electrocardiogram (ECG) patterns has also been described. Objective: ECG change specifically after ...
Calloe Kirstine - - 2009
Transient outward potassium current (I(to)) is thought to be central to the pathogenesis of the Brugada syndrome (BrS). However, an I((to)) activator has not been available with which to validate this hypothesis. Here, we provide a direct test of the hypothesis using a novel I(to) activator, NS5806. Isolated canine ventricular ...
Strauss David G - - 2008
Myocardial scarring from infarction or nonischemic fibrosis forms an arrhythmogenic substrate. The Selvester QRS score has been extensively validated for estimating myocardial infarction scar size in the absence of ECG confounders, but has not been tested to quantify scar in patients with hypertrophy, bundle branch/fascicular blocks, or nonischemic cardiomyopathy. We ...
Puurtinen Merja - - 2009
New miniaturized portable electrocardiogram (ECG) measuring devices may require small interelectrode distance. However, finding a suitable location for a tiny measurement device may prove tedious, as reducing interelectrode distance reduces signal strength. The objective of the study was to define the optimal location for a very closely located (5 cm) ...
Goernig Matthias - - 2009
Electrocardiogram (ECG) particular from tiny, non Q-wave myocardial infarction may lack striking infarct pattern. Spatiotemporal correlation analysis (SCA) of multichannel magnetocardiogram (MCG) is a high-resolution "magnifying glass" to analyze homogeneity of repolarization. SCA involves full 4D spatiotemporal information to identify abnormalities as empirically done by eye in conventional ECG-but on ...
Madias John E - - 2008
A 63-year-old male patient with inferior infarction revealed transient attenuation of the Q-waves in II, III, and aVF, and R-waves in V1-V3 during an exercise stress test. Myocardial scintigraphy disclosed ischemia of the anterior wall and coronary arteriography, a 90% stenosis of the left main coronary artery (LMCA). The mechanism ...
Horácek B Milan - - 2008
Currently used electrocardiographic criteria for identifying patients with ST-elevation myocardial infarction (STEMI) perform with high specificity but low sensitivity. Our aim was to enhance ischemia-detection ability of conventional STEMI criteria based on 12-lead electrocardiogram (ECG) by adding new criteria using 3 vessel-specific leads (VSLs) derived from 12-lead ECG. Study data ...
Madias John E - - 2009
This viewpoint expresses reservations about using the inverse (or negative) aVR lead in the so-called Cabrera limb lead sequence and the implementation of inverse representations of any of the other 12 standard electrocardiographic leads. Instead, the author proposes that in patients with suspected acute coronary syndromes and a nondiagnostic electrocardiographic ...
Neurauter Andreas - - 2008
BACKGROUND: Countershock outcome prediction using ventricular fibrillation (VF) feature analysis needs undisturbed electrocardiogram (ECG) signals and therefore requires interruption of cardiopulmonary resuscitation (CPR). Features that originate from higher frequency bands of the VF power spectrum may be less affected by CPR artefacts and as such reduce cumulative hands-off intervals. MATERIALS ...
Batchvarov Velislav N - - 2008
We tested the hypothesis that ventricular repolarization of the first sinus beat following a ventricular premature beat (VPB) can be modulated in the absence of clearly discernible T-wave changes. We applied principal component analysis (PCA) to assess QRS and T-wave complexity of sinus beats preceding and following VPBs in multiple ...
Ariyarajah Vignendra - - 2008
Abnormal U waves (unduly larger or misshapen) are associated with several conditions such as hypokalemia, arrhythmias, cardiac ischemia, ventricular hypertrophy, and hypertension. Abnormal U waves have also been linked to certain cardiac medications, predominantly antiarrhythmics. However, mechanisms of U-wave-abnormality remains debated and perhaps elusive with the true U-wave relationship to ...
Nikas Dimitrios N DN Michaelideion Cardiac Centre, Ioannina Medical School, Ioannina, - - 2008
Background: Several antioxidants have been found to have conflicting results in attenuating myocardial reperfusion injury. These studies were done primarily in experimental protocols that did not approximate clinical situations. Objective: The aim of this study was to test the efficacy of 3 different antioxidants (ascorbic acid [AA], desferrioxamine, and N-acetylcysteine ...
Drew Barbara J - - 2008
Mason-Likar or proprietary reduced lead (RL) configurations are used for continuous 12-lead electrocardiogram (ECG) monitoring. Because each RL set has a different electrode configuration and derivation, they are inherently different and should not be compared with each other or with the Mason-Likar or standard ECG to determine changes in an ...
Gregg Richard E - - 2008
A 12-lead electrocardiogram (ECG) reconstructed from a reduced subset of leads is desired in continued arrhythmia and ST monitoring for less tangled wires and increased patient comfort. However, the impact of reconstructed 12-lead lead ECG on clinical ECG diagnosis has not been studied thoroughly. This study compares the differences between ...
Vivo Rey P - - 2008
We describe a 65-year-old woman with a history of hypertension and smoking who presented with an acute episode of chest pain precipitated by severe emotional stress. Her initial electrocardiogram done in the emergency room showed non-specific T wave changes in the lateral leads and her cardiac troponin levels were mildly ...
de Luna Antoni Bayés - - 2008
AIMS: To study the different QRS patterns in leads V1 and V2 in first inferior, lateral, and combined inferolateral myocardial infarction (MI) to recognize which are the ECG criteria that best define the presence of lesions isolated to the anatomically lateral wall of the left ventricle. METHODS AND RESULTS: We ...
Kimura Shinpei - - 2010
We describe a 36-year-old woman with inverted Takotsubo cardiomyopathy caused by pheochromocytoma crisis. In the acute phase, her electrocardiogram showed ST segment depression in lead II, III, aVF and V2 through V5. On day 14, tall upright T-waves were observed in leads V2 through V5 despite heart failure and basal ...
Kjaergaard Marie - - 2009
BACKGROUND: The prevalence of coronary heart disease among Greenland Inuit today is similar to that of western populations. The cardiovascular risk profile among Inuit has changed over the past four decades with the introduction of a western life style. An unaltered prevalence of coronary heart disease has been proposed, but ...
Taylor Allen J - - 2008
Electrocardiographic findings indicating myocardial disease, such as left ventricular hypertrophy or ST-T wave abnormalities, or the presence of coronary artery calcium, indicating atherosclerotic coronary artery disease, are both biomarkers of future cardiovascular (CV) risk. Although the risk factors for myocardial and coronary artery disease are similar, their concomitant expression has ...
Jeon Hui-Kyung - - 2008
BACKGROUND: The present study evaluates the lack of Q waves on the electrocardiogram (ECG) in the prediction of myocardial viability compared with dobutamine stress echocardiography (DSE) and rest-redistribution thallium-201 (Tl-201) scintigraphy. HYPOTHESIS: The lack of pathologic Q waves (NoQ) may be a readily available and specific marker for the presence ...
Riera Andrés Ricardo Pérez - - 2008
Wellens syndrome is a clinical-electrocardiographic entity also referred to as left anterior descending (LAD) coronary T-wave syndrome or acute coronary T-wave syndrome. It is a complex of symptoms and signals indicating the existence of an undesirable condition secondary to critical high-grade proximal stenosis of the LAD coronary artery characterized by ...
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