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Sovari Ali Alizadeh - - 2008
We present a 46-year-old patient who suffered from cardiac arrest and subsequently underwent placement of an implantable cardioverter defibrillator (ICD). The patient underwent a cardiac catheterization which revealed no significant coronary artery disease. About 1 year later he experienced appropriated and frequent ICD discharges due to monomorphic ventricular tachycardia (VT) ...
Corrado Domenico - - 2008
OBJECTIVES: We tested whether 3-dimensional electroanatomical voltage mapping (EVM) may help in the differential diagnosis between idiopathic right ventricular outflow tract (RVOT) tachycardia and arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D). BACKGROUND: Right ventricular EVM has been demonstrated to reliably identify low-voltage regions ("electroanatomical scar"), which in patients with ARVC/D correspond to ...
Swerdlow Charles D - - 2008
BACKGROUND: T-wave alternans (TWA) increases acutely prior to ventricular tachycardia (VT) or fibrillation (VF) in animal studies, suggesting that it may provide a warning for VT/VF in implantable cardioverter defibrillator (ICD) patients. Clinically, measurement of surface ECG TWA requires preprocessing the input signal to reduce noise and/or analyzing more sinus ...
Dhar Ritesh - - 2008
There is conflicting literature on the relationship between prolonged QRS duration (QRSd) and arrhythmic events, including sudden cardiac death (SCD), in heart failure patients with or without implantable cardioverter-defibrillators (ICDs). The purpose of this study was to evaluate the prognostic significance of prolonged QRSd relative to arrhythmic outcomes in medically ...
Nogami Akihiko - - 2008
INTRODUCTION: Although successful ablation of ventricular tachycardia (VT) is feasible in arrhythmogenic right ventricular cardiomyopathy (ARVC), long-term recurrence is common. The aim of this study was to assess the usefulness of a change in the isolated delayed component (IDC) as an endpoint of the catheter ablation in ARVC. METHODS AND ...
Lin David - - 2008
BACKGROUND: The most common site of origin of idiopathic ventricular tachycardia (VT) is the right ventricular outflow tract. Idiopathic VT also can arise from the left ventricular outflow tract and the surrounding structures. Morphologic descriptions of 12-lead ECG characteristics of the aortic cusp region are limited. OBJECTIVE: The purpose of ...
Tada Hiroshi - - 2008
BACKGROUND: The characteristics of idiopathic ventricular tachycardias (VTs) or idiopathic premature ventricular contractions (PVCs) arising from the pulmonary artery (PA) have not been sufficiently clarified. OBJECTIVE: The purpose of this study was to clarify the prevalence, characteristics, and preferential sites of idiopathic VT/PVCs arising from the PA (PA-VT/PVCs). METHODS: Data ...
Gibson C Michael - - 2008
OBJECTIVES: The goal of this analysis was to evaluate the association of impaired Thrombolysis In Myocardial Infarction myocardial perfusion grade (TMPG) with sustained ventricular tachycardia (VT) or ventricular fibrillation (VF). BACKGROUND: Impaired TMPG after successful restoration of epicardial flow among patients treated with fibrinolytic therapy for ST-segment elevation myocardial infarction ...
Kumagai Koji - - 2008
BACKGROUND: Despite similar QRS morphology, idiopathic repetitive monomorphic ventricular tachyarrhythmias (VTs) of left ventricular outflow tract (LVOT) are known to have the variants of different adjacent origins, including the aorto-mitral continuity (AMC), anterior site around the mitral annulus (MA), aortic sinus cusps (ASC), and epicardium. However, the electrocardiographic characteristics of ...
Ali Bakhtiar - - 2008
BACKGROUND: In-hospital cardiac arrest has a poor prognosis despite active electrocardiography monitoring. The initial rhythm of approximately 25% of in-hospital cardiopulmonary resuscitation (CPR) events is pulseless ventricular tachycardia/ventricular fibrillation (VT/VF). Early defibrillation is an independent predictor of survival in CPR events caused by VT/VF. The automated external cardioverter defibrillator (AECD) ...
Jastrzebski Marek - - 2008
We report a case of an otherwise healthy 63-year-old male with incessant, highly symptomatic ventricular arrhythmia that displayed over 60,000 premature ventricular contractions and 499 runs of non-sustained ventricular tachycardia (VT) during 24 hours of ECG monitoring. The ventricular ectopy had a QRS morphology of the left bundle branch block ...
Knezl V - - 2008
Thyroid hormones (TH) are powerful modulators of heart function, but their arrhythmogenic effects are less elucidated. We have examined both acute and long-term action of TH on the heart susceptibility to the ventricular fibrillation (VF) and on the heart ability to terminate VF and restore a sinus rhythm. Triiodothyronine (T3) ...
Szydlo Krzysztof - - 2008
BACKGROUND: QT/RR relationship was found to be both rate-dependent and rate-independent, what suggests the influence of autonomic drive and other not-autonomic related factors on it. The steeper QT/RR slope in patients after acute myocardial infarction (MI) was described, but the relationship to ventricular arrhythmias is unknown. The purpose of this ...
Ashino Sonoko - - 2008
A 61-year-old man with prior anteroseptal myocardial infarction (ejection fraction: 40%) presented with recurrent episodes of palpitations. Twelve-lead ECG during palpitations showed an incessant ventricular tachycardia (VT1) with right bundle branch block (RBBB) morphology and inferior axis. Electrophysiologic study revealed that the clinical VT originated from the anterolateral left ventricle. ...
Stoupel Elyiahu - - 2008
BACKGROUND: Studies have linked the natural history of many pathologies with environmental physical activity. This study investigated the relationship between the occurrence of ventricular tachycardia/fibrillation (VT/VF) recorded by implantable cardioverter defibrillators (ICD) and geomagnetic and cosmic ray (neutron) activity. METHODS: The study group included 85 patients (73 men) with cardiomyopathy ...
Nagra Bipinpreet - - 2008
Verapamil-sensitive fascicular ventricular tachycardia (VT) of right bundle branch block (RBBB) and superior axis pattern is typically seen in young patients with structurally normal hearts and considered "idiopathic". Recently, involvement of the Purkinje system in post-infarction monomorphic VT that mimics such idiopathic fascicular VT has been described. In this report ...
Walter Robert J - - 2008
OBJECTIVES: Data from the authors and others suggest that TASER X26 stun devices can acutely alter cardiac function in swine. The authors hypothesized that TASER discharges degrade cardiac performance through a mechanism not involving concurrent acidosis. METHODS: Using an Institutional Animal Care and Use Committee (IACUC)-approved protocol, Yorkshire pigs (25-71 ...
Thoppil Paul S - - 2008
Drug refractory ventricular tachycardia (VT) occurring as a storm after acute myocardial infarction has grave prognosis. We report a case of a middle-aged lady who presented with drug refractory VT that lead to persistent electrical storm two weeks after an anterior wall myocardial infarction. She underwent a successful catheter ablation ...
Ramprakash B - - 2008
Fascicular ventricular tachycardia (VT) is an idiopathic VT with right bundle branch block morphology and left-axis deviation occuring predominantly in young males. Fascicular tachycardia has been classified into three subtypes namely, left posterior fascicular VT, left anterior fascicular VT and upper septal fascicular VT. The mechanism of this tachycardia is ...
Coleman Craig I - - 2008
BACKGROUND: A few previous nested cohort trials have evaluated the use of statins on survival and the occurrence of ventricular tachycardia or fibrillation (VT/VF). While the studies generally agreed on the survival effects, they disagreed on the magnitude of the mortality benefit and on the effect on VT/VF. OBJECTIVE: The ...
Roell Wilhelm - - 2007
Ventricular tachyarrhythmias are the main cause of sudden death in patients after myocardial infarction. Here we show that transplantation of embryonic cardiomyocytes (eCMs) in myocardial infarcts protects against the induction of ventricular tachycardia (VT) in mice. Engraftment of eCMs, but not skeletal myoblasts (SMs), bone marrow cells or cardiac myofibroblasts, ...
Bogun Frank - - 2008
BACKGROUND: Postinfarction reentrant ventricular tachycardia (VT) is usually scar-related. However, the sites of origin of premature ventricular complexes (PVCs) in the setting of healed myocardial infarction have not been well characterized. OBJECTIVE: The purpose of this study was to determine the site of origin of frequent PVCs in postinfarction patients ...
Arnar David O - - 2007
OBJECTIVE: In this study we tested the hypothesis that alpha-2 adrenergic antagonism could facilitate induction of previously non-inducible ventricular tachycardia (VT) during acute ischemia. Previous reports suggest that VT during ischemia may be modulated by (alpha-2 adrenergic agonists. DESIGN: The left anterior descending artery was occluded after instrumentation of the ...
Antz Matthias - - 2008
Ablation of symptomatic ventricular tachycardia (VT) in patients with coronary artery disease is frequently performed using the three dimensional mapping system CARTO. In the amplitude map, bipolar potentials of <1.5 mV are considered abnormal and represent damaged myocardium due to previous infarction. This pathological electrical area can be arrhythmogenic, serving ...
Hiramastu Shigeki - - 2009
We report a case of a patient with cardiac sarcoidosis presenting with a non-sustained ventricular tachycardia (VT), mimicking arrhythmogenic right ventricular cardiomyopathy. After the pathological diagnosis and confirmation of gallium-67 uptake by the myocardium, corticosteroid therapy was initiated. The myocardial gallium accumulation disappeared shortly after the treatment, but the VTs ...
Joung Boyoung - - 2007
PURPOSE: The arrhythmogenic effect of stem cells transplantation (SCT) in an infarct myocardium is still unknown. We investigated arrhythmogenicity of SCT in rat cryo-infarct model. MATERIALS AND METHODS: In rat cryo-infarct model, bone marrow mononuclear stem cells (MNSC, 1 x 10(7) cells) were transplanted into the infarct border zone (BZ) ...
Zeppenfeld Katja - - 2007
BACKGROUND: Catheter ablation of ventricular tachycardia (VT) after repair of congenital heart disease can be difficult because of nonmappable VTs and complex anatomy. Insights into the relation between anatomic isthmuses identified by delineating unexcitable tissue using substrate mapping techniques and critical reentry circuit isthmuses might facilitate ablation. METHODS AND RESULTS: ...
Yamada Takumi - - 2007
A 67-year-old man with ventricular tachycardia (VT) due to arrhythmogenic right ventricular cardiomyopathy (ARVC) underwent electrophysiologic testing. Electroanatomic mapping during the VT seemed to reveal a focal mechanism from near the tricuspid annulus (TA). Several radiofrequency applications delivered at the presumed focus resulted in termination but re-induction of the VT. ...
Zhou Shengmei - - 2008
Beta3-adrenergic receptor (beta3-AR) stimulation inhibits cardiac contractility. This study sought to test the hypothesis that beta3-AR stimulation is antiarrhythmic. We implanted a radio transmitter for continuous electrocardiogram monitoring in 18 dogs with a tendency for high incidence of spontaneous ventricular tachycardia (VT). Ten of 18 had subcutaneous continuous BRL37344 (beta3-AR ...
Ashikaga Hiroshi - - 2007
In catheter ablation of scar-related monomorphic ventricular tachycardia (VT), substrate voltage mapping is used to electrically define the scar during sinus rhythm. However, the electrically defined scar may not accurately reflect the anatomical scar. Magnetic resonance-based visualization of the scar may elucidate the 3D anatomical correlation between the fine structural ...
Fernandes Verônica Rolim S - - 2007
PURPOSE: To prospectively determine whether mechanical behavior of left ventricular wall segments that contain different degrees of scar tissue and are located at different distances from the interface between infarcted and noninfarcted myocardial tissue can help predict inducibility of monomorphic ventricular tachycardia (VT) in patients with ischemic cardiomyopathy. MATERIALS AND ...
Israel Carsten W - - 2007
The term "electrical storm" (ES) indicates a state of cardiac electrical instability manifested by several episodes of ventricular tachyarrhythmias (VTs) within a short time. In patients with an implantable cardioverter defibrillator (ICD), ES is best defined as 3 appropriate VT detections in 24 h, treated by antitachycardia pacing, shock or ...
Ngarmukos Tachapong - - 2007
BACKGROUND: The incidence of arrhythmic complications in Thai patients with acute coronary syndromes (ACS) has not been previously reported. The present study results will serve as the local database for future studies. OBJECTIVE: To evaluate the incidence of arrhythmic complications in ASC in Thai patients and to identify factors that ...
Vereckei András - - 2008
BACKGROUND: We recently reported an ECG algorithm for differential diagnosis of regular wide QRS complex tachycardias that was superior to the Brugada algorithm. OBJECTIVE: The purpose of this study was to further simplify the algorithm by omitting the complicated morphologic criteria and restricting the analysis to lead aVR. METHODS: In ...
Lever Nigel A - - 2007
AIMS: The degree of organization of ventricular fibrillation (VF) can be examined in terms of the regularity of the electrical activity within the ventricle. Using electrograms (EGMs) stored within implanted cardioverter defibrillators (ICDs), we examined the hypothesis that the degree of organization, or regularity, was different if the VF was ...
Najjar Jamal - - 2007
AIMS: Prior cardiac surgery limits epicardial ventricular tachycardia (VT) ablation due to epicardial adhesions formation. METHODS AND RESULTS: We describe an epicardial VT ablation through the coronary venous system in a patient with mechanical mitro-aortic prostheses. The different possible ablation approaches and their potential limitations are discussed. CONCLUSION: In selected ...
Blaer Yosef - - 2007
Self-terminating ventricular fibrillation (VF) was recorded in a 42-year-old woman without coronary artery or structural heart disease. Reviewing the scientific literature, we found that this type of VF had appeared in vivo in some animal models but was sparsely described in clinical practice. This most unusual case shows that potentially ...
Eksik Abdurrahman - - 2007
BACKGROUND: Previous studies have reported a circadian variation of ventricular tachyarrhythmias. However, there is no detailed information of the daily distribution of ventricular tachycardia (VT) and ventricular fibrillation (VF) episodes. The purpose of this study was to evaluate the daily distribution of episodes of ventricular tachyarrhythmia in patients with implantable ...
Kessler Eric J - - 2007
Ventricular tachycardia (VT) may be secondary to many different underlying pathophysiologies. The nature of the underlying disorder determines amenability to catheter ablation, thus, dictating the circumstances under which it should be undertaken. The differing substrates also influence the choice of techniques that are used. The most intensively studied clinical subgroup ...
Yamawake Noriyoshi - - 2007
BACKGROUND: It is well recognized that the mechanism of idiopathic ventricular tachycardia (VT) arising from the right ventricular outflow tract (RVOT) is mostly due to cyclic AMP-mediated triggered activity. The mechanism of VT arising from the left ventricular outflow tract (LVOT) has not been well clarified whether it is the ...
Yamada Takumi - - 2007
OBJECTIVES: The purpose of this study was to examine the relationship between the origin and breakout site of idiopathic ventricular tachycardia (VT) or premature ventricular contractions (PVCs) originating from the myocardium around the ventricular outflow tract. BACKGROUND: The myocardial network around the ventricular outflow tract is not well known. METHODS: ...
Lee Young Soo - - 2007
A 22-year-old man with incessant ventricular tachycardia (VT) associated with pneumococcal meningitis without obvious heart disease manifesting as febrile sensation and severe headache visited our emergency department. Initial electrocardiography showed ventricular premature couplets, but the rhythm grew more serious and developed into incessant monomorphic VT resulting in an electrical storm. ...
Ohkubo Kimie - - 2007
BACKGROUND: The pathogenesis of Brugada syndrome (BS) is reported to be phase 2 reentry resulting from shortening of the action potential duration at the epicardial site of the right ventricular outflow tract (RVOT). However, several reports have shown a high incidence of ventricular late potentials (LPs) and a high rate ...
Anand Kishlay - - 2007
This study investigated the circadian, daily, and seasonal distributions of ventricular arrhythmias in patients with new implantable cardioverter-defibrillator placement at Creighton University Medical Center from January 2000 to December 2004. The incidence and distribution of ventricular tachyarrhythmias as recorded by implantable cardioverter-defibrillators were analyzed with respect to season, month, day ...
Xu Tingyan - - 2008
OBJECTIVES: We sought to investigate the echocardiographic myocardial performance index (MPI) to assess post-resuscitation myocardial function following electrically and ischemically induced ventricular fibrillation (VF). MATERIALS AND METHODS: VF was induced in fourteen anesthetized pigs weighing 38+/-4 kg. VF was induced electrically in seven animals and ischemically, following transient occlusion of ...
Sesselberg Henry W - - 2007
BACKGROUND: Much of prognostic implications of ventricular arrhythmia storms remain unclear. OBJECTIVE: We evaluated the risk associated with electrical storm in patients with defibrillators in the Multicenter Automatic Defibrillator Implantation Trial II (MADIT-II) study. METHODS: Electrical storm was defined as > or =3 episodes of ventricular tachycardia (VT) or ventricular ...
Elgarhi N - - 2008
OBJECTIVE: Evaluation of the significance of the Wedensky Modulation (WM) examination for ventricular tachyarrhythmias (VT) in patients with coronary artery disease and implantable cardioverter-defibrillator therapy (ICD). DESIGN: Prospective, single-centre study conducted from 2004 to 2006. SETTING: University of Bonn, Department of Medicine - Cardiology, Bonn, Germany. PATIENTS: 37 consecutive patients ...
Bazan Victor - - 2007
BACKGROUND: Identification of an epicardial origin for left ventricular tachycardia (LV-VT) based on electrocardiogram (ECG) criteria facilitates the approach to catheter ablation. Reported criteria, although helpful, may not apply uniformly to all LV regions. OBJECTIVE: We hypothesized that unique region-specific ECG patterns identify epicardial LV-VTs in patients without myocardial infarction. ...
Sherman Lawrence D - - 2007
INTRODUCTION: Most animal studies of ventricular fibrillation (VF) waveform characteristics involve healthy animals with VF initiated by electric shock. However, clinical VF is usually the result of ischemia. The waveform characteristics in these two types of VF may differ. The angular velocity (AV), frequency ratio (FR) and median frequency (MF) ...
Ventura Rodolfo - - 2008
OBJECTIVE: Catheter ablation of ventricular tachycardia (VT) after myocardial infarction (MI) can be complex and time-consuming. We only targeted the previously documented VTs and those with similar or longer cycle lengths. METHODS: 30 patients with VTs after MI were included in the study. Voltage mapping was performed using an electro-anatomic ...
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