Search Results
Results 701 - 750 of 1902
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Latha R - - 2008
High sensitive C-reactive protein (hs-CRP), a non-specific marker of inflammatory status has considerable interest focused due to its ability to predict myocardial infarction, stroke, peripheral arterial disease and sudden cardiac death. Alcoholics are known to be associated with inflammation of heart. This study was taken up to look for an ...
Viitasalo Matti - - 2008
BACKGROUND: Catecholaminergic polymorphic ventricular tachycardia (CPVT) is characterized by risk of polymorphic ventricular tachycardia (pVT) and sudden death during stress. Experimental CPVT models show that delayed afterdepolarization (DAD)-induced triggered activity is the initiating mechanism of pVT, whereas an increase in transmural dispersion of repolarization (TDR) controls degeneration of pVT to ...
Ortega-Carnicer Julián - - 2008
A patient in whom moderate hypothermia developed after prolonged cardiopulmonary resuscitation is described. Hypothermia was manifested by transient electrocardiogram changes, including long QT, precordial J waves, and downsloping ST-segment elevation ending in a negative T wave in leads V(1) and V(2) resembling the Brugada syndrome. The physiopathologic mechanisms of these ...
Janata Andreas - - 2008
BACKGROUND: Long-term monitoring of patients at risk of arrhythmias would benefit from a miniaturized device. This study evaluated the quality of electrocardiogram (ECG) signals recorded by a miniaturized ECG recorder. METHODS: ECG data were concurrently recorded with an investigational device (Philips Medical Systems, Seattle, WA, USA) and a Holter recorder ...
De Roock Sophie - - 2008
BACKGROUND: Tako-tsubo syndrome (TTS) refers to the apical ballooning of the left ventricle observed when angiographic ventriculography is performed in patients presenting with electrocardiographic changes suggestive of acute coronary syndrome (new transient ST-segment deviation (>0.05 mV) or T-wave inversion (>0.2 mV)), mild elevation of cardiac markers, but normal coronary arteries ...
Pahlm Olle - - 2008
For a 12-lead resting electrocardiogram (ECG) to be considered "standard," limb electrodes should be placed distally on the limbs. When resting ECGs are taken in conjunction with an ECG-monitoring situation, so-called monitoring sites (as described by Mason and Likar and also others) on the torso are used. Numerous publication have ...
Man Sum-Che - - 2008
Electrocardiograms (ECGs) made with Mason-Likar electrode configuration (ML-ECGs) show well-known differences from standard 12-lead ECGs (Std-ECGs). We recorded, simultaneously, Std-ECGs and ML-ECGs in 180 subjects. Using these ECGs, 8 x 8 individual and general conversion matrices were created by linear regression, and standard ECGs were reconstructed from ML-ECGs using these ...
Lawless Christine E - - 2008
PURPOSE: Electrocardiography (ECG) has been proposed as a method to enhance the ability of the preparticipation examination (PPE) to detect underlying cardiac conditions that can lead to sudden cardiac death (SCD) in young athletes. METHODS AND RESULTS: We conducted a Medline review of the published medical literature, using the key ...
Kocoglu Hasan H Department of Anesthesiology, Faculty of Medicine, Abant Izzet Baysal University, Bolu, - - 2008
Background: Preconditioning might protect the myocardium against ischemia/ reperfusion injury by reducing infarct size and preventing arrhythmias. Dexmedetomidine (DEX) is a highly selective α2-agonist used for sedoanalgesia in daily anesthetic practice. The cardioprotective effects of DEX on infarct size and on the incidence of arrhythmias observed after regional ischemia/reperfusion injury ...
Azawi O I - - 2009
The aim of the present study was to test the hypothesis of wave pattern of follicular growth and to monitor the ovarian follicular dynamic in Iraqi buffalo cows. Reproductive tracts were collected at random intervals slaughtered at Mosul abattoir. According to morphological appearance of the corpus luteum, the estrous cycle ...
Hamlin Robert L - - 2008
This article explains the principles of electrocardiography, and explains how it is used by Safety Pharmacology, with a focus on the requirement for multiple leads in Safety Pharmacology assessment. Electrocardiography as used in different disciplines (e.g., medicine, anesthesiology, physiology, and pharmacology/toxicology/safety pharmacology) has different requirements for the number of electrodes ...
Nagase Satoshi - - 2008
OBJECTIVES: We examined the relationship between repolarization abnormality and coved-type ST-segment elevation with terminal inverted T-wave (type 1 electrocardiogram [ECG]) in patients with Brugada syndrome (BrS). BACKGROUND: Recent experimental studies have suggested that accentuation of the right ventricular action potential (AP) notch preferentially prolongs epicardial AP causing inversion of the ...
Sinno Mohamad C N - - 2008
BACKGROUND: Changes in the amplitude of the R wave (RWA) on the electrocardiogram (ECG) have been described during acute myocardial ischemia and infarction. However, this has not been well studied in a controlled setting. We hypothesized that significant increase in RWA occurs during early transmural myocardial ischemia. METHODS: We prospectively ...
Dagres Nikolaos - - 2009
Differentiation between left- and right-sided inferoseptal accessory pathways by existing ECG algorithms is unsatisfactory. We reviewed the 12-lead ECGs of 113 consecutive patients undergoing successful ablation of a single manifest inferoseptal pathway (40% at the mitral, 60% at the tricuspid annulus). For prediction of a right-sided location, the most useful ...
Ariyarajah Vignendra - - 2008
Left atrial enlargement is predictive of cardiovascular events. The predictive power, however, of the combination of electrocardiographic (LAE-ECG) and echocardiographic left atrial enlargement (LAE-Echo) has not been extensively evaluated. We prospectively identified patients admitted with non-ST-segment elevation myocardial infarction (NSTEMI) who developed new-onset heart failure during admission. Baseline electrocardiograms obtained ...
Toosi Mehrdad Seilanian - - 2008
Precise recording of the standard 12-lead electrocardiogram (ECG) is technically time consuming. Placing limb leads on the torso has the major advantages of ease of use, increased speed of application, and decreased artifact. This modified ECG frequently substitutes for the standard 12-lead ECG in intensive care units to detect ischemia, ...
Bour Jean - - 2008
Impedance cardiography (ICG) charts the rises and falls of thoracic impedance as the fluid content of the chest changes with each heartbeat. Breathing, arrhythmia, movements and posture interfere with the ICG. Modern pattern recognition software can now produce a composite signal-averaged ICG that considerably simplifies interpretation. The first derivative velocity ...
Marsh Eleanor - - 2008
Many patients with potentially life-threatening cardiac conditions presenting with transient loss of consciousness are referred first to neurology clinics. Therefore, neurologists must remain competent to interpret electrocardiograms (ECGs) and in particular be able to identify those rare conditions that predict sudden cardiac death. A 12-lead ECG is cheap and readily ...
Chutani S - - 2008
Brugada syndrome is one of the important causes of sudden cardiac death in young adults. The condition is associated with typical ECG changes in anteroseptal leads V1 and V2 that can be unmasked by various medications, electrolyte disturbances, and even by the febrile state in susceptible individuals. The case history ...
Atrial flutter (AFl) may exist with or without underlying structural heart disease. Typical AFl presents as a "sawtooth" pattern on the ECG - with inverted flutter (F) waves in the inferior leads and upright F waves in V1. This morphology offers no direct clues as to the underlying cardiac disorder, ...
Kosar Feridun - - 2008
BACKGROUND: Although previous studies have documented a variety of electrocardiogram (ECG) abnormalities in obesity, P-wave alterations, which represent an increased risk for atrial arrhythmia, have not been studied very well in these patients. The aim of the present study was to evaluate P-wave duration and P dispersion (Pd) in obese ...
Inan Omer T - - 2008
Unobtrusive and compact methods for monitoring time varying hemodynamic trends can allow physicians to monitor heart failure of outpatients at home. In this paper, the ballistocardiogram (BCG), measured on a modified commercial bathroom scale, is proposed as a viable option for this important need. The BCG measures the reaction force ...
Kríz Jan - - 2008
Noninvasive recording of movements caused by the heartbeat and the blood circulation is known as ballistocardiography. Several studies have shown the capability of a force plate to detect cardiac activity in the human body. The aim of this paper is to present a new method based on differential geometry of ...
Wong Kiing-Ing - - 2008
Extended patient monitoring has become increasingly important for detection of cardiac conditions, such as irregularities in the rhythms of the heart, while patient is practicing normal daily activity. This paper presents a design of a single lead wireless cardiac rhythm interpretive instrument that capable of capture the electrocardiogram (ECG) in ...
Moody Gb - - 2008
The 9th annual PhysioNet/Computers in Cardiology challenge invited participants to measure T-wave alternans (TWA) in a set of 100 two-minute electrocardiograms that included subjects with a variety of risk factors for sudden cardiac death (including ventricular tachyarrhythmias, transient myocardial ischemia, and acute myocardial infarctions), healthy controls, and synthetic ECGs with ...
Medvegy Mihály - - 2008
BACKGROUND: Previous studies have shown that the diagnosis and localization of previous non-Q wave myocardial infarction (NQMI) is possible by body surface potential mapping (BSPM), but the criteria for the discrimination between anteroseptal and inferoseptal middle regions remain to be determined. METHODS: BSPM using 63 unipolar leads was recorded in ...
Holmqvist Fredrik - - 2008
BACKGROUND: Different P-wave morphologies during sinus rhythm as displayed on standard ECGs have been postulated to correspond to differences in interatrial conduction. OBJECTIVE: The purpose of this study was to evaluate the hypothesis by comparing P-wave morphologies using left atrial activation maps. METHODS: Twenty-eight patients (mean age 49 +/- 9 ...
Kui Chen - - 2008
BACKGROUND: The J wave has been seen in idiopathic ventricular fibrillation, Brugada syndrome, and early repolarization syndrome. Although these conditions share some ECG features, the clinical consequences are markedly different. J wave presentation in healthy subjects is not a rare phenomenon, although its characteristics are poorly understood. The aim of ...
Agomuoh , D I; ...
Objective: The aim of the study was to document the pattern of EGG abnormalities in the hypertensive patients in Port Harcourt and to compare their prevalence with what obtains in the apparently normal population as documented in previous studies. Methods: The electrocardiographic profile of one hundred and thirty two consecutive ...
Yang Chung-Chi - - 2010
The 12-lead electrocardiogram is an easily obtained, non-invasive method to assist in the diagnosis of an acute myocardial infarction. Traditional electrocardiographic criteria for diagnosing inferior myocardial infarction emphasize abnormalities of the initial large Q wave or ST segment elevation in leads II, III, and aVF. We report a case that ...
Nakai Kenji - - 2007
Noninvasive risk stratification is important for screening for lethal arrhythmia. We developed a 187-channel signal-averaged vector-projected high-resolution electrocardiograph (187-ch SAVP-ECG) for detecting abnormalities in the spatial location of ventricular high-frequency late potentials (HFLPs) and ventricular repolarization. The subjects consisted of 30 normal controls (CONTROL) and 13 patients with HFLPs (6 ...
Thilén Ulf - - 2007
AIMS: Although atrial fibrillation is a frequent complication of an atrial septal defect (ASD) of the secundum type, the underlying mechanisms are poorly understood. Atrial conduction disturbances, manifested as a prolonged P-wave duration, have been suggested as a substrate for arrhythmia. Prolongation of the P-wave in unrepaired ASD has been ...
Trägårdh Elin - - 2007
BACKGROUND: The electrocardiographic (ECG) diagnosis of acute myocardial infarction (MI) should be improved. This might be done either by regarding all 24 aspects (both positive and negative leads), or a subset hereof (e.g. 19-lead ECG), of the conventional 12-lead ECG or by using additional electrodes. The purpose of this study ...
Ten Tusscher Kirsten H W J - - 2007
AIMS: During ageing, after infarction, in cardiomyopathies and other cardiac diseases, the percentage of fibrotic (connective) tissue may increase from 6% up to 10-35%. The presence of increased amounts of connective tissue is strongly correlated with the occurrence of arrhythmias and sudden cardiac death. METHODS AND RESULTS: In this article, ...
Schueller P O - - 2007
Severe pulmonary hypertension (PAH) leads to right ventricular dysfunction and is associated with different atrial arrhythmias. In PAH patients, the echocardiographic Tei-index is used for monitoring right heart function. The P-wave signal-averaged ECG (SA-ECG) has been shown to have a potential role in identifying patients at risk of developing paroxysmal ...
Perron Annick - - 2007
OBJECTIVES: This study investigates whether sequential addition of inverted (negative) leads from the 24-lead electrocardiogram (ECG) to the orderly sequenced 12-lead ECG would identify a number of leads with which the sensitivity for diagnosis of acute transmural ischemia is significantly increased with minimal loss of specificity. BACKGROUND: Acute transmural ischemia ...
Yavuzkir M - - 2007
It has been emphasized recently that there is a strong association between atrial fibrillation and inflammation. Rheumatoid arthritis (RA), characterized by ongoing inflammatory activity, can increase the risk of atrial arrhythmia. P-wave dispersion has been encountered as a risk factor for atrial fibrillation and the effect of inflammation on P-wave ...
Li Daxiang - - 2008
In this study, the effects of tea catechins and tea theaflavins on myocardial contraction were examined in isolated rat hearts using a Langendorff-perfusion system. We found that both tea catechins and theaflavins had positive inotropic effects on the myocardium. Of the tested chemicals, epicatechin-3-gallate (ECG) and theaflavin-3,3'-digallate (TF(4)) appear to ...
Batchvarov Velislav N - - 2007
Incorrect electrode cable connections during electrocardiographic (ECG) recording can simulate rhythm or conduction disturbance, myocardial ischaemia and infarction, as well as other clinically important abnormalities. When only precordial or only limb cables, excluding the neutral cable, have been interchanged the waveforms in the different leads are re-arranged, inverted, or unchanged, ...
Kawasaki Tatsuya - - 2008
BACKGROUND AND PURPOSE: R-wave amplitude change during exercise has been reported to enhance diagnostic value for myocardial ischemia in coronary heart disease. METHODS: We summed up R-wave amplitude in all the 12 leads during exercise testing and correlated the results with regional myocardial ischemia or diffuse subendocardial ischemia as detected ...
Bellazzini Marc A - - 2010
Hyperkalemia-induced electrocardiogram changes such as dysrhythmias and altered T wave morphology are well described in the medical literature. Pseudo-infarction hyperkalemia-induced changes are less well known, but present a unique danger for the clinician treating these critically ill patients. This article describes a case of pseudo anteroseptal myocardial infarction in a ...
Wylie John V JV - - 2007
Propafenone toxicity can cause significant QRS widening and markedly abnormal ventricular activation pattern. Aberrant ventricular activation upon its resolution is known to produce persistent T-wave changes known as "cardiac memory" (CM). A 74-year-old woman presented with a severely abnormal electrocardiogram consistent with propafenone toxicity. As her QRS complex narrowed, T-wave ...
Azizova O A - - 2007
The diagnostic and prognostic potentialities of the parameters of free-radical processes and high resolution ECG in coronary disease were evaluated. A relationship between oxidative resistance of the plasma (MDA concentration after 24-h copper-induced oxidation) and clinical characteristics of coronary disease (functional class of angina and high-resolution ECG parameters) was detected. ...
Sovari Ali A - - 2007
We present a 61-year-old patient who showed deep T wave inversion on her electrocardiogram (ECG) after cardioversion of her atrial flutter to sinus rhythm. A cardiac catheterization showed normal coronary arteries. The T wave inversion on her ECG is thought to be due to a cardiac memory phenomenon. Cardiac memory ...
Krasteva Vessela - - 2007
We propose a quasi real-time method for discrimination of ventricular ectopic beats from both supraventricular and paced beats in the electrocardiogram (ECG). The heartbeat waveforms were evaluated within a fixed-length window around the fiducial points (100 ms before, 450 ms after). Our algorithm was designed to operate with minimal expert ...
Bucciarelli-Ducci Chiara - - 2008
Wellens' syndrome is characterized by symmetrically inverted T-waves in the precordial leads suggestive of impending myocardial infarction due to a critical proximal left anterior descending (LAD) stenosis. We describe three unusual cases of patients with such electrocardiographic abnormality in which coronary angiography ruled out the presence of critical coronary stenosis ...
Tabereaux Paul B - - 2007
BACKGROUND: The roles of Purkinje fibers (PFs) and focal wave fronts, if any, in the maintenance of ventricular fibrillation (VF) are unknown. If PFs are involved in VF maintenance, it should be possible to map wave fronts propagating from PFs into the working ventricular myocardium during VF. If wave fronts ...
Yamada Takumi - - 2007
A 63-year-old woman with symptomatic premature ventricular contractions (PVCs) underwent electrophysiologic testing. The PVCs were suggested to originate from the infra-aortic valvular left ventricular outflow tract because the PVCs had S-waves in leads I, V5, and V6, and an R/S ratio >1 in lead V(1). However, during some PVCs without ...
Otten Richard F - - 2007
Brugada pattern ECG changes have been described in various disease states and drug therapies, including electrolyte abnormalities, myocardial pathology, medications, and mechanical abnormalities. Therefore, the diagnosis of Brugada syndrome cannot be made in the presence of confounding variables according to prevailing guidelines. We present a case report which illustrates two ...
Couderc Jean-Philippe - - 2007
QT variability has been reported to be associated with ventricular arrhythmias and sudden cardiac death. There is limited data regarding variability in T-wave morphology and its prognostic value. In this study, we present a novel approach for the measurement of T-wave variability (TWV) reflecting changes in T-wave morphology, and we ...
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