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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 ...
Scalise Lorenzo - - 2008
The aim of the present work is to establish a protocol for monitoring the cardiac activity measuring the skin surface vibrations of the main neck vessels, caused by vascular wall motion in carotid artery. The method is based on the optical recording of the movements of the neck by means ...
Ariyarajah Vignendra - - 2007
A proportionate and incremental association between left atrial (LA) dilatation on a transthoracic echocardiogram (TTE) and increasing severity in abnormal atrial depolarization can be described by the regression formula: LA dimension in parasternal long-axis view (in millimeters) = 2.47 + 0.29 [P-wave duration (in milliseconds)]. However, prospective testing of this ...
Trägårdh Elin - - 2007
The standard 12-lead electrocardiogram (ECG) is one of the most commonly used methods for diagnosing heart disease. Standard ECG is not always optimal, however, and new ECG methods can provide additional information. Analysis of high-frequency QRS components (HF-QRS) has been shown to increase the diagnostic performance of the ECG. Several ...
Pietrasik Grzegorz - - 2007
There are limited data regarding the prognostic value of QRS complex fragmentation, defined as changes in QRS morphology (<120 ms) with different RSR' patterns: additional R waves, notched S wave, or >1 R' wave. The purpose of our analysis was to assess the prognostic value of presence of Q waves ...
Ting P - - 2007
A 45-year-old man was found to have an abnormal myocardial perfusion scan. He was asymptomatic, with no chest pain, breathlessness or palpitations. Clinical examination was unremarkable. The 12-lead electrocardiography (ECG) showed increased QRS voltage in leads V3-V6, and deep T-wave inversions noted in leads V3-V6, with an absence of septal ...
Shinde Rituparna - - 2007
The "J wave" (also referred to as "the Osborn wave,""the J deflection," or "the camel's hump") is a distinctive deflection occurring at the QRS-ST junction. In 1953, Dr. John Osborn described the "J wave" as an "injury current" resulting in ventricular fibrillation during experimental hypothermia. Although "J Wave" is supposed ...
Baranchuk Adrian - - 2007
Inappropriate shocks delivered by the implantable cardioverter defibrillator (ICD) are an increasingly recognized complication. The most frequent cause is related to supraventricular rhythms associated with fast conduction to the ventricles that are incorrectly detected as ventricular tachycardia leading to inappropriate antitachycardia pacing and/or shocks. Oversensing is a frequent cause of ...
Brown Jason P - - 2007
OBJECTIVES: This study was designed to separate focal from atypical macro-re-entrant atrial tachycardia (AT) on the electrocardiogram (ECG). BACKGROUND: Focal AT often cannot be distinguished from macro-re-entrant AT until the time of electrophysiology study (EPS). We hypothesized that quantitative ECG metrics should separate focal AT, using its short activation relative ...
You Chun-Chi - - 2007
A 53-year-old male presented to our emergency department with a sudden onset of ventricular tachycardia with left bundle branch block and right axis deviation. After the tachyarrhythmia converting to sinus rhythm, the ECG displayed sinus rhythm with a typical epsilon wave in leads V1 and V2. Arrhythmogenic right ventricular dysplasia/cardiomyopathy ...
Talavera J - - 2008
The aim of this study was to describe normal ECG patterns and values in four species of conscious raptors (Eurasian kestrel, Griffon vulture, Little owl, and Eurasian Eagle owl). Electrocardiograms were carried out in 75 conscious birds belonging to four species of raptors. Lead II waveforms were analysed to determine ...
Perez M V - - 2007
BACKGROUND: The prevalence and prognostic values of electrocardiogram (ECG) abnormalities in Hispanics have not been compared to other ethnicities in a large population. Despite a worse cardiovascular risk profile, the prevalence of cardiovascular disease is lower in Hispanics compared to non-Hispanics. HYPOTHESIS: We hypothesized that ECG abnormalities were less common ...
Patanè Salvatore - - 2008
Tako-tsubo-like (Japanese word for octopus-catcher) left ventricular dysfunction is an enigmatic cardiomyopathy. Typically, the patients have a history of recent stressful incidents immediately preceding onset of mild to moderate chest pain, have ST-segment elevation in leads V3 through V6, ECG changes that typically demonstrate diffuse T-wave inversions and abnormal QS-wave ...
Ariyarajah Vignendra - - 2007
The association between left atrial (LA) dilation and fundamental exercise parameters has not shared equal extensive investigation as its clinical correlate, interatrial block (IAB; P waves > or =110 ms). We prospectively identified 94 consecutive patients with LA dilation on 2-dimensional transthoracic echocardiography but without atrioventricular valvular disease, hypertension, or ...
Lee Kun-Tai - - 2007
BACKGROUND: The interaction between long-and short-term cardiac memory (CM) is unknown. METHODS AND RESULTS: The T-wave areas and QTc intervals in each ECG lead were analyzed in 11 patients with manifest Wolff-Parkinson-White syndrome with posterior or septal accessory pathway (4 females; mean age: 47+/-12 years) in the following ECGs: (1) ...
Zhou Yifeng - - 2008
A case of ventricular noncompaction with Giant P waves and focal atrial tachycardia is presented. A 36-year-old man was admitted to our hospital because of palpitations and a progressive worsening of heart failure. A 12 lead rest electrocardiogram showed large positive waves followed by smaller negative waves in limb leads ...
Wagner Galen S - - 2007
A comparison was performed between the points measured using the Selvester QRS scoring system in 60 electrocardiograms (ECGs) displayed in both a standard format as well as a 4-fold magnified (quad-plot) format. Fifty criteria (a maximum possibility of 31 points) were evaluated in each ECG. The data indicate that in ...
Ikefuji Hiroyuki - - 2007
A close relationship exists between electric current and the magnetic field. However, electricity and magnetism have different physical characteristics, and magnetocardiography (MCG) may provide information on cardiac current that is difficult to obtain by electrocardiography (ECG). In the present study, we investigated the issue of whether the current density map ...
Wang Hong H Department of Cardiology, Xingqiao Hosipital, Third Military Medical University, Chongqing, 400037, - - 2007
Detection of abnormal myocardial perfusion is crucial to the prognosis of patients with coronary artery disease (CAD) after they have undergone percutaneous coronary intervention (PCI). The objective of this study is to evaluate the effect of myocardial perfusion by three different methods-intra-coronary myocardial contrast echocardiography (ICMCE), corrected thrombolysis in myocardial ...
Madias John E - - 2007
Sudden cardiac death (SCD) due to various cardiomyopathies is currently prevented by the implantation of an automated cardioverter/defibrillator (ICD). ICD impalntation in patients who are not survivors of SCD, or have not suffered potentially lethal ventricular arrhythmias, are based on the presence of cardiomyopathy with a reduced left ventricular ejection ...
Hlimonenko Irina - - 2007
The aim of this study was to assess pulse wave velocity (PWV) and augmentation index in different arteries in patients with severe coronary heart disease (CHD). Signal measurements were obtained from 28 subjects. Severe coronary heart disease was confirmed by coronary angiography. Aortic PWV and Augmentation Index were measured using ...
Ueyama Takeshi - - 2007
BACKGROUND: The response of the ST-segment in the right precordial leads to Na+ channel blockers in patients without structural heart disease and a typical Brugada-type ECG has not been fully elucidated. METHODS AND RESULTS: A pilsicainide challenge test was performed in 161 patients and according to recently established ECG criteria ...
Deveci Bulent - - 2007
Differentiating ischemic (ILVD) from nonischemic left ventricular dysfunction (NILVD) is important prognostically and therapeutically but might be difficult clinically. The differentiating role of electrocardiographic (ECG) features in the presence of left bundle-branch block (LBBB) is debatable on differentiating ILVD from NILVD. The present study assessed whether there is the role ...
Masse Stephane - - 2007
AIMS: The aim of this report was to review existing techniques for assessment of directionality in fibrillation and to describe the concept of wave similarity analysis in human VF. METHODS: We applied a technique called wave similarity analysis to bipolar electrograms to study directionality during various rhythms (sinus rhythm, ventricular ...
Aguado-Sierra Jazmin - - 2007
Pressure waveforms measured at different locations in the coronary arteries are similar. Previous work has shown the cardiovascular system can be modelled as a Windkessel and wave system. [1] We now suggest that simultaneously measured coronary pressure, P, and velocity, U, can be used to calculate the separated reservoir, P, ...
Eskola Markku J - - 2007
Isolated right ventricular infarction (RVI) is a rare event. The electrocardiographic (ECG) pattern of RVI, ST-elevation in lead V4R and in anterior chest leads V1-3 is similar to that of a proximal occlusion of a small, nondominant right coronary artery (RCA). The ECG changes may be misinterpreted as signs of ...
Chauhan Vijay S - - 2007
PURPOSE OF REVIEW: Sudden cardiac death remains a major cause of mortality among patients with cardiomyopathy and implantable cardioverter-defibrillator therapy has been shown to improve survival in these patients. Effective use of prophylactic implantable cardioverter-defibrillator therapy requires accurate risk stratification beyond assessment of ejection fraction, however. Repolarization alternans is a ...
Stöllberger Claudia - - 2007
INTRODUCTION AND OBJECTIVES: Left ventricular hypertrabeculation/non-compaction (LVHT) is a cardiac abnormality characterized by prominent trabeculations and intertrabecular recesses, and frequently associated with neuromuscular disorders (NMD). The aim of the study was to assess the prevalence of electrocardiographic (ECG) abnormalities in LVHT and its association with clinical symptoms, left ventricular size, ...
Madias John E - - 2007
The resting electrocardiogram (ECG) furnishes essential information for the diagnosis, management, and prognostic evaluation of patients with congestive heart failure (CHF). Almost any ECG diagnostic entity may turn out to be useful in the care of patients with CHF, revealing the non-specificity of the ECG in CHF. Nevertheless a number ...
Papavassiliu Theano - - 2007
PURPOSE: Despite several electrocardiographic, echocardiographic, electrophysiologic and pathologic studies, the cause of abnormal Q waves in patients with HCM remains unclear. Cardiovascular magnetic resonance (CMR) is a powerful in vivo diagnostic tool for evaluating cardiac morphology and function. We hypothesized that estimation of segmental and transmural extent of myocardial enhancement ...
GĹ‚owniak Andrzej - - 2007
Background: Time-domain analysis of the P-wave in signal-averaged ECG (SA-ECG) recorded from chest leads is an accepted method for evaluating the inhomogeneity of atrial excitation, predictive for atrial arrhythmias. The aim of the study was to determine the value of the SA-ECG technique for intraatrial signal processing. Additional aims were ...
Drighil Abdenasser - - 2007
Atrial fibrillation (AF) is a frequent arrhythmia in patients undergoing hemodialysis (HD). P wave duration (PWdu) and P wave dispersion (PWdi) have been shown to be predictors of emerging AF in different clinical conditions. We sought to study the impact of HD on PWdu, PWdi, and P wave amplitude in ...
MacKenzie Ross - - 2007
The presence of unexpected Q waves in an applicant's electrocardiogram poses a diagnostic dilemma for the medical director. On the one hand, the Q waves may be the remnants of a previously unsuspected "silent" myocardial infarction. Conversely, unexpected Q waves may represent a normal or positional variant, or an important ...
Jancaityte Lina - - 2007
OBJECTIVES: To clarify the importance of clinical features and changes in the first electrocardiogram in 28-day and 1-year mortality in patients with diabetes. MATERIAL AND METHODS: Men and women of Kaunas city aged 25-64 years with the first-ever myocardial infarction during 1983-1992 and with the first electrocardiogram were enrolled in ...
Ariyarajah Vignendra - - 2007
Left atrial (LA) dilatation on transthoracic echocardiograms (TTEs) can be estimated in inpatients by the formula LA dimension (mm) = 2.47 + 0.29 x P wave duration (ms). This association, however, has not been assessed among outpatients who are perhaps "less sick." The authors applied blinded P wave measurements to ...
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