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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 ...
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 ...
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 ...
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 ...
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 ...
Martínez-Sánchez Juan J Servicio de Cardiología, Hospital Universitario Virgen de la Arrixaca, Murcia, - - 2007
To study the usefulness of incremental atrial pacing for evaluating the effect of radiofrequency catheter ablation on slow pathway conduction in patients with atrioventricular (AV) nodal reentrant tachycardia. A prospective study was carried out in patients either with (ie, AV nodal reentrant tachycardia group) or without (ie, control group) inducible ...
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 ...
Hlimonenko Irina I Tallinn University of Technology, Technomedicum, Tallinn, Estonia. - - 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 ...
Aguado-Sierra Jazmin J Physiological Flow Studies Group, Bioengineering Department, Imperial College London, London, UK. - - 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, ...
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 ...
de Lezo José Suárez JS Servicio de Cardiología, Hospital Universitario Reina Sofía, Córdoba, - - 2007
It is difficult to distinguish the effects early revascularization and regenerative therapy have on left ventricular function in patients with acute myocardial infarction (AMI). This study was an investigation into 3 groups of patients who had a revascularized anterior wall AMI and depressed left ventricular function (i.e., ejection fraction <45%). ...
Simons A - - 2007
A 74-year-old woman with documented coronary artery disease presented with symptoms of angina at rest. During these episodes of angina, the initial abnormal terminal negative T waves converted to normal positive T waves. In this article the significance of pseudonormalisation as a sign of ischaemia is reviewed. The underlying electropathological ...
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 ...
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 ...
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, ...
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 ...
GĹ‚owniak Andrzej - - 2007
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 to ...
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 ...
Isa Rodrigo R Unidad de Arritmias, Instituto Cardiovascular, Hospital Clínico San Carlos, Madrid, - - 2007
Contemporary atrial pacemakers incorporate pacing modes for treating atrial arrhythmias. Because atrial fibrillation in the right atrium can exhibit an organized pattern, it can be difficult to differentiate from atrial flutter. We assessed criteria for discriminating between atrial flutter and organized atrial fibrillation when using a bipolar electrode in the ...
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 ...
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 ...
Fayn Jocelyne - - 2007
BACKGROUND: The standard 12-lead ECG remains one of the basic investigations for the early detection and assessment of acute coronary syndromes. It is easy to perform, anywhere and anytime, and can be digitally transmitted within minutes to an emergency medical service for remote advice and triage. But the conventional ST-segment ...
Yue Wei - - 2007
BACKGROUND: ECG (electrocardiogram) markers reflecting abnormal heart rate variability and abnormal repolarization as well as several biochemical markers reflecting inflammation, endothelial dysfunction, and procoagulation states were reported to show an association with increased cardiovascular mortality. ECG and biochemical markers could operate independently or they could interrelate in pathogenetic pathways of ...
John A D - - 2006
This article examines the role of electrocardiography in patient monitoring during an operative procedure. In addition to providing a wealth of physiological information, including information on the electrical activity of the heart, the ECG assists in monitoring and detecting a variety of changes, such as cardiac arrhythmias, electrolyte changes, and ...
Ariet Mario - - 2007
Serial comparison of electrocardiograms (ECGs) can provide a useful clinical function by reporting to the editing cardiologist the diagnostic changes that have occurred since the previous ECG. This program detects "significant measurement differences" in each of the diagnostic categories to detect these changes. We evaluated the accuracy and use of ...
Kesek Milos - - 2006
The non-dipolar content of the T-wave, i.e. the component of the signal, which cannot be explained by a dipolar model, has been suggested as a measure of the local repolarization inhomogeneity. Our purpose was to study the non-dipolar content of the T-wave during the initial course of ST-elevation myocardial infarction ...
Takeuchi Makoto - - 2006
BACKGROUND: Myocardial damage occurs in the late stage of Kawasaki disease (KD) regardless of whether coronary artery lesions (CALs) are present. METHODS AND RESULTS: A signal-averaged electrocardiogram (ECG) was performed in 23 patients who were in the late stage of KD (CAL was found in 12 and no CAL (non-CAL) ...
Angeli Fabio - - 2006
OBJECTIVE: Although electrocardiography (ECG) is recommended in all subjects with hypertension, no information is available on the influence exerted by random changes in the placement of electrodes on the day-to-day variability of ECG criteria for diagnosis of left ventricular hypertrophy (LVH). METHODS: In a multicentre, randomized study, two standard 12-lead ...
Sejersten Maria - - 2007
ST-segment measurements in the standard 12-lead electrocardiogram (ECG) of patients with acute coronary syndromes are crucial for these patients' management. Our objective was to determine whether the 12-lead ECG derived from the 3-lead EASI system can attain a level of diagnostic performance similar to that of the Mason-Likar (ML) 12-lead ...
Moreno R - - 2006
The publisher regrets that this was an accidental duplication of an article that has already been published in Eur. J. Echocardiogr., 4 (2003) 226-228, . The duplicate article has therefore been withdrawn.
Antzelevitch Charles C Masonic Medical Research Laboratory, Utica, NY 13501, USA. - - 2006
One hundred years after Willem Einthoven first recorded the electrocardiogram (ECG), physicians and scientists are still debating the cellular basis for the various waves of the ECG. In this review, our focus is on the cellular basis for the J, T, and U waves of the ECG. The J wave ...
Asch Federico M - - 2006
BACKGROUND: The presence of Q waves in the electrocardiogram (ECG) has been used as a marker of prior myocardial infarction (MI). Its accuracy, however, is uncertain. The purpose of this study is to determine the accuracy of an ECG to detect prior MI compared with a novel criterion standard. METHODS: ...
Goernig Matthias - - 2006
There is a lack of standard methods for the analysis of magnetocardiograms (MCGs). MCG signals have a shape similar to the ECG (P wave, QRS complex, T wave). High-quality multichannel recordings can indicate even slight disturbances of de- and repolarisation. The purpose of our study was to apply a new ...
Baron Thomas W - - 2006
AIM: In the presence of coronary artery disease, implantable cardioverter-defibrillators (ICD) are used effectively for treating life-threatening tachyarrhythmias. Continuous monitoring of myocardial ischaemia would provide a new diagnostic option in future ICD generations. METHODS AND RESULTS: In 22 selected patients undergoing coronary angioplasty, percutaneous transluminal coronary angioplasty (PTCA), three electrodes, ...
Tagawa Minoru - - 2006
Two patients presented with transient left ventricular apical ballooning (takotsubo cardiomyopathy) induced by emotional stress caused by the Central Niigata Prefecture Earthquake in 2004. These patients complained of chest pain immediately after the earthquake. In patient 1, electrocardiography (ECG) showed slight ST elevation in leads V5 to V6 and 1 ...
Madias John E - - 2006
This case report describes an ambulatory patient with congestive heart failure and peripheral edema who lost 18 lb in response to enhanced diuresis over the course of 1 week. The ECG showed increases in the amplitude of P waves, QRS complexes, and T waves; the duration of P waves, QRS ...
Komiya Norihiro - - 2006
We describe the case of a 39-year-old man who experienced a ventricular fibrillation storm related to a prominent J wave in the inferior and lateral electrocardiographic leads on the day after gastrostomy. The J wave slowly decreased after amiodarone therapy (400 mg/day) was started, and ventricular fibrillation disappeared.
Dogan Sait M - - 2008
AIM: P-wave dispersion (PD), and duration has been reported to be associated with inhomogeneous and discontinuous propagation of sinus impulses. The aim of this study was to investigate the PD in patients with coronary slow flow (CSF) phenomenon. METHODS: Study population included 48 patients with angiographically proven normal coronary arteries ...
Cattermole G N - - 2006
The case is presented of a 66 year old woman who attended the emergency department with severe abdominal pain subsequent to a bout of coughing, following a week's history of productive cough. She was known to have chronic obstructive pulmonary disease and was also on warfarin for recurrent deep vein ...
Trägårdh Elin - - 2006
The number of leads needed in clinical electrocardiography depends on the clinical problem to be solved. The standard 12-lead ECG is so well established that alternative lead systems must prove their advantage through well-conducted clinical studies to achieve clinical acceptance. Certain additional leads seem to add valuable information in specific ...
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