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Results 801 - 850 of 1905
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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, ...
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 ...
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 ...
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 ...
Macfarlane Peter W - - 2006
The echocardiogram undoubtedly is part of the cardiologist's armamentarium in the diagnosis and elucidation of cardiac abnormalities, but the ECG still continues to be the most frequently recorded noninvasive test in medicine. For many patients, particularly those who have newly diagnosed hypertension, a 12-lead ECG recording may be the only ...
Tan C - - 2006
A 25-year-old man was brought to the emergency room after being found unconscious. Electrocardiography (ECG) showed changes classical of tricyclic antidepressant (TCA) poisoning. These included sinus tachycardia, QTc prolongation, QRS complex widening, right axis deviation and positive R waves in lead aVR. This unique ECG highlights the importance of lead ...
Martin D F - - 2006
BACKGROUND AND STUDY AIMS: It is well recognized that myocardial ischemia can occur during endoscopic retrograde cholangiopancreatography (ERCP). Acute arrhythmias and ST segment changes have been reported by a number of authors, but the longer-term sequelae with regard to permanent myocardial damage are not known. The aim of this study ...
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 ...
Covic Adrian - - 2006
BACKGROUND: Chronic kidney disease (CKD) patients have a 3-30-fold increased risk of death compared with the general population. This mortality difference is even more pronounced in younger subjects. Two markers of aortic stiffness--aortic pulse wave velocity (PWV) and augmentation index (AIx)--have been prospectively related to all-cause and cardiovascular (CV) mortality ...
Lander Paul - - 2006
This article introduces a novel concept of abnormal intra-QRS potentials (AIQPs) associated with myocardial ischemia. AIQPs are microvolt-level potentials--subtle alterations in the QRS of the high-resolution electrocardiogram (ECG)--isolated from the unfiltered signal-averaged ECG (SAECG) by a method of mathematical modeling. The aims of the study were (1) to determine the ...
Ariyarajah Vignendra - - 2006
BACKGROUND: Interatrial block (IAB; P wave > or = 110 ms) is highly prevalent and associated with atrial tachyarrhythmias, left atrial electromechanical dysfunction and is a potential risk for embolism. Investigators have often used different parameters for P-wave duration to define IAB, and this causes confusion further adding to clinician ...
Wong Cheuk-Kit - - 2006
BACKGROUND: The presence of pathological Q waves in the infarct leads on the surface electrocardiogram in an ST-elevation acute myocardial infarction indicates myocardial necrosis. Clinically it might be difficult to ascertain the onset of acute myocardial infarction. Our aim was to assess whether the presence or absence of Q waves ...
Shusterman Vladimir - - 2006
BACKGROUND: Analysis of repolarization instability, manifested by T-wave alternans (TWA), has proved useful for arrhythmia risk assessment. However, temporal relations between TWA and the spontaneous initiation of ventricular tachyarrhythmias (VTA) in humans are unknown. We examined continuous dynamics of repolarization in Holter electrocardiograms with spontaneous sustained (>30 seconds) VTA. METHODS ...
Coronel Ruben - - 2006
BACKGROUND: Activation recovery intervals (ARIs) and monophasic action potential (MAP) duration are used as measures of action potential duration in beating hearts. However, controversies exist concerning the correct way to record MAPs or calculate ARIs. We have addressed these issues experimentally. OBJECTIVES: To experimentally address the controversies concerning the correct ...
Das Mithilesh K - - 2006
BACKGROUND: Q waves on a 12-lead ECG are markers of a prior myocardial infarction (MI). However, they may regress or even disappear over time, and there is no specific ECG sign of a non-Q-wave MI. Fragmented QRS complexes (fQRSs), which include various RSR' patterns, without a typical bundle-branch block are ...
Gilliam F Roosevelt FR - - 2006
The expanded indications for the use of implantable cardioverter defibrillators (ICDs) for primary prevention of sudden cardiac death have increased concerns about inappropriate delivery of therapies. Dual-chamber systems have improved the capacity of ICDs to differentiate ventricular arrhythmias from supraventricular arrhythmias. Still, T-wave oversensing is a major source of inappropriate ...
Olsson Sven-Erik - - 2006
Early revascularization of acute coronary syndromes improves the prognosis. It is of vital importance that the decision to treat the patient is taken as early as possible. The aim of this study was (i) to develop an automated tool for the analysis of electrocardiograms (ECGs) with regard to changes that ...
Aiba Takeshi - - 2006
OBJECTIVES: We examined how repolarization and depolarization abnormalities contribute to the development of extrasystoles and subsequent ventricular fibrillation (VF) in a model of the Brugada syndrome. BACKGROUND: Repolarization and depolarization abnormalities have been considered to be mechanisms of the coved-type ST-segment elevation (Brugada-electrocardiogram [ECG]) and development of VF in the ...
Pasquini Marta - - 2006
BACKGROUND AND PURPOSE: Previous studies showed that insular strokes are associated with electrocardiographic (ECG) changes. However, they did not take into account the 1(st) ECG recorded at admission, but continuous ECG recorded up to 72 hours after onset. Whether these changes are the consequence of the infarct, or are associated ...
Davies Justin E - - 2006
BACKGROUND: Coronary blood flow peaks in diastole when aortic blood pressure has fallen. Current models fail to completely explain this phenomenon. We present a new approach-using wave intensity analysis-to explain this phenomenon in normal subjects and to evaluate the effects of left ventricular hypertrophy (LVH). METHOD AND RESULTS: We measured ...
Arya Arash - - 2006
The P-wave morphology can help trying to localize the origin of an ectopic atrial tachycardia noninvasively. We describe the case of a 54-year-old male patient with an ectopic right atrial tachycardia and positive P waves in the inferior leads on a 12 lead ECG. Electroanatomical mapping with the CARTO system ...
Strohmer Bernhard - - 2006
Focal ablation of trigger premature ventricular complexes (PVCs) from the Purkinje system helped to suppress idiopathic ventricular fibrillation (VF) in an athlete who had suffered from frequent appropriate shock therapies. However, only a few days after successful ablation T-wave oversensing occurred during exercise and resulted in repetitive distressing defibrillator shocks. ...
Michaelides Andreas P - - 2006
OBJECTIVE: To evaluate the improvement of diagnostic ability of exercise testing to detect multivessel coronary artery disease in patients with extended Q-wave anterior myocardial infarction, using additional right-sided chest leads. METHODS: Fifty-two consecutive patients with Q-wave anterior myocardial infarction underwent exercise testing, using the standard 12 and the additional right-sided ...
Jensen Jesper K - - 2006
This study evaluated the potential consequences of the redefined joint European/American electrocardiographic criteria for an established myocardial infarction (MI). New and previous diagnostic Q-wave criteria were used in patients with stable angina pectoris. Seventy-nine patients with and 77 patients without a documented previous MI were compared using the results of ...
Tousek Petr - - 2006
The identification of viable myocardium after myocardial infarction (MI) carries major prognostic impact. Due to myocardial stunning early after successful mechanical reperfusion of acute myocardial infarction, analysis of myocardial perfusion but not of contractile function can be used to differentiate between necrotic and viable myocardium. Although being widely regarded as ...
Garvey J Lee - - 2006
The electrocardiogram (ECG) continues to be a critical component of the evaluation of patients who have signs and symptoms of emergency cardiac conditions. This tool is now approximately 100 years old and has been a standard in clinical practice for more than half a century. Application of new signal processing ...
Perkiömäki Juha S - - 2006
The aim of the study was to assess whether parameters based on the T-wave loop and QRS loop predict mortality, and cardiac mortality in particular, during follow-up of consecutive survivors of acute myocardial infarction (AMI). Patients with AMI (n = 437), treated according to contemporary guidelines, underwent digital high-resolution electrocardiography ...
Chiam P - - 2006
A 72-year-old woman with diabetes mellitus, hypertension and dyslipidaemia presented with severe chest pain of four hours duration. Her electrocardiogram (ECG) showed tall R waves in leads V1-2, and ST segment depression in leads V1- 4, consistent with an isolated posterior myocardial infarction (MI). Emergency coronary angiogram showed an occluded ...
Sharieff Ghazala Q - - 2006
Knowledge of the basics of pediatric ECG interpretation is helpful in differentiating normal from abnormal findings. These basics include familiarity with the age-related normal findings in heart rate, intervals, axis, and waveform morphologies; an understand-ing of cardiac physiologic changes associated with age and maturation, particularly the adaptation from right to ...
Guglin Maya E - - 2006
OBJECTIVE: The aim of the study was to determine the frequency and nature of errors in computer electrocardiogram (ECG) reading. METHODS: The ECGs were collected in the tertiary care VA Hospital from both inpatients and outpatients. They were read by the electrocardiograph built-in computer software, and then reread by two ...
Engblom, Henrik
Both presence and extent of myocardial infarction are important prognostic factors for mortality and quality of life in patients with ischemic heart disease. Thus, it is of great clinical importance to be able to diagnose and characterize myocardial infarction. One way to diagnose myocardial infarction is by using the 12-lead ...
Jia Hua-Ping - - 2006
BACKGROUND: Aimed to elucidate the characteristics of the spectra of superior venae cavae (SVC) in respiratory cycles in patients with right heart failure. METHODS: The spectra of SVC of 30 patients with right heart failure and 30 paired healthy subjects were recorded through right supraclavicular fossa view. The profiles of ...
Schwaab Bernhard - - 2006
A 12-lead electrocardiogram (ECG) recorded in patients with acute coronary syndrome (ACS) was transmitted to a call centre via telephone (tele-ECG). In 120 patients (mean age 64 years) referred to hospitals because of ACS, a standard 12-lead ECG and a tele-ECG recorded at the same time were compared by two ...
Kanai Hiroshi - - 2006
Though myocardial viscoelasticity is essential in the evaluation of heart diastolic properties, it has never been noninvasively measured in vivo. By the ultrasonic measurement of the myocardial motion, we have already found that some pulsive waves are spontaneously excited by aortic-valve closure (AVC) at end-systole (T0) (IEEE UFFC-43(1996)791-810). Using a ...
MacKenzie Ross - - 2006
Misplacement of recording electrodes can generate misleading patterns on the standard 12-lead electrocardiogram (ECG). Some lead placement errors are easily recognizable, others are more difficult to detect and can be quite important in risk selection because the resulting changes in ECG morphology can mimic other conditions such as myocardial infarction. ...
Balci Bahattin - - 2006
BACKGROUND: Restoration of a positive T-wave in the chronic stage of myocardial infarction (MI) is usually seen in patients with a non-Q-wave (non-transmural) MI, where a viable tissue is present. The causes and significance of a positive T-wave in the early phase of acute MI are not clear. AIM: To ...
Owens Colum - - 2006
BACKGROUND: New methods for detecting myocardial infarction in patients with suspected acute coronary syndromes are needed particularly in an era where the majority of patients with myocardial infarction present with non-diagnostic 12-lead electrocardiograms (ECG). We compared a novel epicardial diagnostic algorithm using epicardial potentials from the 80-lead body surface map ...
Patel Pranav M - - 2005
A 12-lead electrocardiogram (ECG) graphically displays the heart's electrical activity. It is the most common clinical tool for detection and diagnosis of heart disease, and is especially useful for detecting conditions related to abnormalities of cardiac rhythm. ECG should be considered in patients who have known cardiovascular disease or an ...
Ker J - - 2005
In this study we evaluated the validity of well-known human electrocardiographic markers of myocardial pathology in Dorper sheep. These markers include: the duration of the QRS complex of premature ventricular complexes (PVCs), the presence of notching of the QRS complex of PVCs and change of the ST-segment of PVCs. It ...
Patberg Kornelis W - - 2005
Cardiac memory (CM) is identified as an altered T wave on electrocardiogram and vectorcardiogram that is seen when sinus rhythm resumes after a period of abnormal myocardial activation. Specifically, the sinus rhythm T wave tracks the QRS vector of the abnormal impulse. CM frequently is induced by ventricular pacing or ...
Brunson Charlie E - - 2005
The genesis of the J wave during hypothermia has been attributed to injury current, delayed ventricular depolarization and early repolarization, tissue anoxia, and acidosis. To our knowledge, no studies have addressed the appearance of the J wave in relation to the myocardial K+ transfer and metabolism during hypothermia. Dogs (n ...
Rahman M Atiar - - 2006
BACKGROUND: Changes in high-frequency (HF) QRS components of the electrocardiogram (ECG) (150-250 Hz) are more sensitive than changes in conventional ST segments for detecting myocardial ischemia. We investigated the accuracy of 12-lead HF QRS ECG in detecting perfusion defects during adenosine tetrofosmin myocardial perfusion imaging (MPI). METHODS AND RESULTS: 12-lead ...
Horácek B Milan - - 2006
Although the Selvester Scoring System for estimating the size of myocardial infarction from the standard 12-lead electrocardiogram (ECG) has potential clinical value, it has found limited application because of the difficulties in making precise and reproducible measurements. The objective of this study was to develop software to automate the Selvester ...
Birkbeck James P - - 2006
To correlate prespecified P-wave morphologies with echocardiographically derived left atrial volumes (LAVs), we studied a convenience sample of 71 patients with predominantly normal left ventricular systolic function (mean ejection fraction = 58.2% +/- 6.6%) who underwent concurrent 2-dimensional echocardiogram and 12-lead electrocardiogram. Left atrial volume was calculated from apical end-systolic ...
Staggs Susan E - - 2005
Electrocardiographic lead aVR, an augmented unipolar limb lead, for the most part has been ignored in clinical practice. Lead aVR, however, can be useful in diagnosing and determining prognosis in a variety of cardiovascular conditions, including myocardial infarction, myocardial ischemia, conduction disturbances, supraventricular arrhythmias, acute pericarditis, and pulmonary emboli. Careful ...
Fraley M A - - 2005
Obesity is associated with a wide variety of electrocardiographic (ECG) abnormalities. Most of these reflect alterations in cardiac morphology. Some serve as markers of risk for sudden death. Key ECG abnormalities or alterations occurring with disproportionately high frequency in obese subjects include: leftward shifts of the P wave QRS and ...
Ozcan Firat - - 2005
Addisonian crisis represents a state of acute adrenocortical insufficiency and occurs in patient with Addison's disease who are exposed to stress of infection, surgery, trauma, vomiting and diarrhea. We present a case with a 39-year-old female patient who admitted to the hospital with Addisonian crisis and, interestingly, her electrocardiograph showed ...
Brady William J - - 2005
The ECG has limitations in the evaluation of the chest-pain patient, including the presence of confounding ECG patterns; the ECG patterns that confound the diagnosis of acute myocardial infarction(AMI) include left bundle branch block (LBBB), ventricular paced rhythms (VPR), and left ventricular hypertrophy (LVH). These patterns produce new ST-segment/T-wave abnormalities, ...
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