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Yokoshiki Hisashi - - 2010
A 55-year-old woman with recurrent syncope and palpitation experienced polymorphic ventricular tachycardia (VT) and more than 3 monomorphic VTs with a right bundle branch block configuration as inferior, middle, and superior axis. During the pleomorphic VT, the diastolic potential (dp) was recorded at the anterolateral left ventricle. Changes in the ...
Bunch T Jared - - 2010
BACKGROUND: Ablation of ventricular tachycardia (VT) reduces implantable cardioverter defibrillator shocks. Intracardiac ultrasound (ICE) can visualize and quantify the function of all left ventricular wall segments. We thus hypothesized that ICE could identify scar tissue and provide a guide to facilitate substrate-guided VT ablation. METHODS: Eighteen patients underwent VT ablation ...
Saba Samir - - 2010
BACKGROUND: Inappropriate and unnecessary implantable cardioverter-defibrillator shocks continue to be highly prevalent. METHODS AND RESULTS: We prospectively evaluated a new algorithm for discriminating supraventricular (SVT) and ventricular (VT) tachycardias with 1:1 atrioventricular association that is based on the response of the arrhythmia to simultaneous or convergent dual-chamber antitachycardia pacing. Patients ...
Kuck Karl-Heinz - - 2010
BACKGROUND: In patients with ventricular tachycardia (VT) and a history of myocardial infarction, intervention with an implantable cardioverter defibrillator (ICD) can prevent sudden cardiac death and thereby reduce total mortality. However, ICD shocks are painful and do not provide complete protection against sudden cardiac death. We assessed the potential benefit ...
Pamuru Pranathi R - - 2010
Among the right ventricular conditions, Uhl's anomaly, arrhythmogenic right ventricular dysplasia / cardiomyopathy (ARVD/C) and right ventricular outflow tract ventricular tachycardia (RVOT VT) are disorders that exhibit pathogenic changes involving the right ventricular (RV) myocardium, and are expected to be severe or milder forms of the same condition. The review ...
Peichl Petr - - 2010
BACKGROUND: Frequent episodes of polymorphic ventricular tachycardias/ventricular fibrillation (VT/VF) in patients with coronary artery disease can be triggered by monomorphic ventricular premature beats (VPBs) and thus, amenable to catheter ablation. The goal of this study was to review single-center experience in catheter ablation of electrical storm caused by focally triggered ...
Yamada Takumi - - 2010
A 77-year-old man underwent electrophysiological testing for idiopathic ventricular tachycardia (VT) with QRS alternans exhibiting a left bundle branch block and left inferior axis QRS morphology. Successful radiofrequency catheter ablation was achieved at the site of the earliest ventricular activation in the right coronary cusp. Pacing at this site reproduced ...
Komura Masatoshi - - 2010
This study investigated the clinical course of arrhythmogenic right ventricular cardiomyopathy (ARVC) patients and in particular evaluated the contribution of radiofrequency catheter ablation (RFCA) and an implantable cardioverter-defibrillator (ICD) to the treatment of ARVC. ARVC is a myocardial disorder and a cause of sudden cardiac death due to ventricular tachycardia ...
Brembilla-Perrot Beatrice - - 2010
The results of programmed ventricular stimulation (PVS) may change after myocardial infarction (MI). The objective was to study the factors that could predict the results of a second PVS. Left ventricular ejection fraction (LVEF) and QRS duration were determined and PVS performed within 3 to 14 years of one another ...
Chakraborty Praloy - - 2010
Acute myocardial ischemia can cause ventricular tachycardia (VT) in patients with structurally normal heart. Contrary to the fact that in patients with chronic myocardial scarring the ventricular tachycardia is monomorphic, in patients with acute ischemia the ventricular tachycardia is polymorphic and is reversible with coronary revascularization.We are reporting a 40 ...
Anas Emran M Abu - - 2010
Ventricular tachycardia (VT) and ventricular fibrillation (VF) are the most serious cardiac arrhythmias that require quick and accurate detection to save lives. Automated external defibrillators (AEDs) have been developed to recognize these severe cardiac arrhythmias using complex algorithms inside it and determine if an electric shock should in fact be ...
Kroll Mark W MW Biomedical Engineering at the University of Minnesota, Minneapolis, MN 55454, USA. - - 2010
It has been long recognized that there are 2 methods for inducing VF (ventricular fibrillation) with electrical currentsā€„ These are: (1) delivering a high-charge shock into the cardiac T-wave, and (2) delivering lower level currents for 1-5 seconds. Present electrical safety standards are based on this understanding. We present new ...
Zheng Yi Y Department of Electronic Engineering, Fudan University, Shanghai, China. - - 2010
In cardiac electrophysiological study, several electrical stimulation protocols have been employed to induce ventricular fibrillations (VF). In addition, sites of inducing may have different impacts on inducing results as well as different inducing protocols. To study whether VF inducing method is determinant of induced outcome, we simulated VFs induced with ...
Ibaida Ayman A School of Computer Science and IT - RMIT University-Melbourne, VIC 3000, Australia. - - 2010
Since ECG is huge in size sending large volume data over resource constrained wireless networks is power consuming and will reduce the energy of nodes in Body Sensor Networks (BSN). Therefore, compression of ECGs and diagnosis of diseases from compressed ECGs will play key roles in enhancing the life-time of ...
Fiala Martin - - 2010
Knowledge on ventricular tachycardia (VT) in isolated ventricular noncompaction (IVNC) is limited. We report on a patient with IVNC who presented with cardiogenic shock due to an incessant drug-resistant VT that was cured by radiofrequency ablation. The VT had characteristics of a deep septal focal arrhythmia, which was distinctive by ...
Yamada Takumi - - 2010
Soon after an upgrade from a single-chamber implantable cardioverter-defibrillator (ICD) to cardiac resynchronization therapy (CRT) with an ICD, a 64-year-old man with non-ischaemic cardiomyopathy began to have increasingly frequent ICD shocks for slow ventricular tachycardia (VT). At electrophysiological study, no clinical VT was induced by endocardial right ventricular pacing, but ...
Hachiya Hitoshi - - 2010
BACKGROUND: An ECG predictor of ablation success has not been determined for difficult cases of outflow tract ventricular tachycardia/ventricular premature contractions (OT-VT/VPC). METHODS AND RESULTS: ECG analysis and radiofrequency catheter ablation (RFCA) were performed in 70 patients with OT-VT/VPC. The peak deflection index (PDI) was determined in the inferior lead ...
Vallès Ermengol - - 2010
ECG criteria identifying epicardial (EPI) origin for ventricular tachycardia (VT) in nonischemic cardiomyopathy have not been determined. Endocardial (ENDO) and EPI basal left ventricle fibrosis characterizes the VT substrate. We assessed the QRS from 102 basal-superior/lateral EPI and 67 comparable ENDO pace maps in 14 patients with nonischemic cardiomyopathy. Pace ...
Pellis Tommaso T Emergency Medical Service, Anaesthesia and Intensive Care, Santa Maria degli Angeli Hospital, Via Monterale 24, Pordenone, Italy. - - 2010
External cardiac mechanical stimulation is one of the fastest resuscitative manoeuvres possible in the emergency setting. Precordial thump (PT), initially reported for treatment of atrio-ventricular block, has been subsequently described to cardiovert also ventricular tachycardia (VT) and fibrillation (VF). PT efficacy, mechanics and mechanisms remain poorly characterized. Appropriate MESH and ...
Steven Daniel - - 2009
BACKGROUND: The aortomitral continuity (AMC) has been described as a site of origin for ventricular tachycardias (VT) in structurally normal hearts. There is a paucity of data on the contribution of this region to VTs in patients with structural heart disease. METHODS AND RESULTS: Data from 550 consecutive patients undergoing ...
Murata Hiroshige - - 2009
It is important to follow up patients surviving acute myocardial infarction (MI), to detect the presence of any life-threatening arrhythmias. Various non-invasive examinations, such as signal-averaged ECG (SAECG), have been reported to predict the fatal ventricular tachycardia (VT); however, these conventional methods have limitations in detecting VT occurring in patients ...
Okumura Yasuo - - 2009
This case report describes a left bundle branch block (LBBB)-type ventricular tachycardia (VT) with a unique reentrant circuit in a patient with cardiac sarcoidosis. The VT morphology and pace mapping supported an exit site of the VT from the basal posterior right ventricle (RV) septum. Nonetheless, concealed entrainment was established ...
Enjoji Yoshihisa - - 2009
Ventricular fibrillation (VF) or ventricular tachycardia (VT) storm is a life-threatening arrhythmia. Antiarrhythmic drugs (AADs) are not necessarily effective to rescue life from such conditions. Catheter ablation (CA) targeting triggering premature ventricular contractions (PVCs) of VF or VT that originates from Purkinje fiber network (PFN) is reported to be effective, ...
Mizobuchi Masahiro - - 2010
Unmappable ventricular tachycardia (VT) is a challenge in the management of arrhythmogenic right ventricular cardiomyopathy (ARVC). We report a feasible strategy for a curative ablation. In the present case with ARVC, the clinical VT showed a single morphology of left bundle branch block with inferior axis. Neither activation mapping nor ...
Tarkin Jason M - - 2010
Diagnosis of clinically significant ventricular tachycardia (VT) relies on accurate electrocardiogram (ECG) interpretation, in the context of a convincing clinical picture. ECG artifacts resembling VT are common and can be misleading. We present two instances of VT-like ECG artifacts, which demonstrate the variable presentation of such artifacts and highlight ways ...
Yee Raymond - - 2010
BACKGROUND: With the development of left ventricular pacing for cardiac resynchronization, there is an interest in the possibility of improving ventricular antitachycardia pacing (ATP) efficacy by pacing from the LV electrode(s). OBJECTIVE: This study assessed the efficacy of pacing delivered from the left coronary vein (LCV) compared to that delivered ...
Colombowala Ilyas K - - 2010
INTRODUCTION: Assessment of ventricular activation pattern is critical to the successful ablation of ventricular tachycardia (VT). We have previously shown that the global atrial activation pattern during tachycardia can be rapidly and accurately assessed by calculating the postpacing interval variability (PPIV); PPIV was minimal in circuitous tachycardias and highly variable ...
Das Mithilesh K - - 2010
BACKGROUND: Re-entry is the most common mechanism of sustained monomorphic ventricular tachycardia (VT) in patients with coronary artery disease and prior myocardial infarction (MI). OBJECTIVE: This study sought to report the electrophysiological properties of a series of patients with prior MI who underwent radiofrequency ablation (RFA) for VT originating instead ...
Letsas Konstantinos P - - 2010
AIMS: The present study investigated whether several ECG markers of ventricular repolarization are associated with ventricular tachycardia/fibrillation (VT/VF) inducibility in subjects with type 1 ECG pattern of Brugada syndrome (BS). METHODS AND RESULTS: The clinical data of 23 individuals (19 males, age 42.69 +/- 14.63) with spontaneous (n = 10) ...
Arya Arash - - 2009
The implantable cardioverter defibrillator (ICD) has emerged as an accepted therapy for prevention of sudden cardiac death due to ventricular arrhythmias in selected groups of high-risk patients, however, it cannot prevent the ventricular arrhythmias. ICD shocks are painful, reduce the quality of life, and spontaneous episodes of ventricular tachycardia (VT) ...
Jongnarangsin Krit - - 2010
BACKGROUND: Inappropriate implantable cardioverter-defibrillator (ICD) therapy of atrial tachycardia (AT) with 1:1 atrioventricular (AV) conduction is common because it is difficult to discriminate from ventricular tachycardia (VT) with 1:1 retrograde conduction. Tachycardia cycle length (CL) variability and the relationship between atrial and ventricular CLs may be useful in discriminating AT ...
Oikonomidis Dimitrios L - - 2010
The arrhythmogenic effects of endothelin-1 (ET-1) are mediated via ETA-receptors, but the role of ETB-receptors is unclear. We examined the pathophysiologic role of ETB-receptors on ventricular tachyarrhythmias (VT/VF) during myocardial infarction (MI). MI was induced by coronary ligation in two animal groups, namely in wild-type (n = 63) and in ...
Fujita Shuhei - - 2010
We report a 7-year old girl with ventricular tachycardia exacerbated by fever. She experienced her first symptom of palpitations during an influenza infection, and electrocardiogram showed wide QRS tachycardia of a left bundle branch block inferior axis pattern. We performed an electrophysiological study (EPS) for diagnosis, but the wide QRS ...
Kumar Saurabh - - 2010
BACKGROUND: The long-term outcomes of patients with inducible very fast ventricular tachycardia (VFVT) of cycle length (CL) 200 to 250 ms have not been well studied. METHODS: Consecutive patients with ischemic cardiomyopathy with a left ventricular ejection fraction (LVEF) of <or=40% (n = 300) underwent programmed ventricular stimulation (PVS) and ...
Timmermans Carl - - 2010
INTRODUCTION: Transvenous cryoablation has proven to be safe and effective for the treatment of supraventricular arrhythmias. The aim of this prospective study was to report the feasibility and safety of catheter-based cryoablation for the treatment of postinfarction and idiopathic ventricular tachycardia (VT). METHODS AND RESULTS: Catheter-based cryoablation was performed in ...
Yamada Takumi - - 2009
A 57-year-old man with idiopathic ventricular tachycardia (VT) underwent electrophysiological testing. Activation mapping revealed two remote earliest ventricular activation sites on anterior and posterior sides of the anterior papillary muscle. On the anterior side, far-field activity preceded near-field activity. Catheter ablation was successful on the posterior side. Ventricular far-field activity ...
Hasdemir Can - - 2009
A 34-year-old pregnant woman presented to the emergency department with the complaints of palpitations at 32 weeks gestation. The diagnosis of right ventricular outflow tract ventricular tachycardia (VT) was made. Intravenous 5 mg of metoprolol and 25 mg of diltiazem did not terminate the VT. Ten milligrams of adenosine were ...
Gopinathannair Rakesh R Department of Internal Medicine, University of Iowa College of Medicine and the Veterans Affairs Medical Center, University of Iowa, Iowa City, Iowa, - - 2009
Ischemic focal ventricular tachycardia (VT) occurs in animals and humans. Angiotensin-converting enzyme inhibitors and receptor blockers reduce sudden death in patients with ischemic heart disease. In our dog model of coronary artery occlusion (CAO), we tested the hypothesis that angiotensin II (AGII) will selectively promote focal VT and that the ...
Lemmert Miguel E - - 2010
Sudden cardiac arrest is a leading cause of death in industrialized countries, and ischemic ventricular fibrillation (VF) is a frequent cause. The purpose of this study was to determine whether patients with ST elevation myocardial infarction (STEMI) who develop ischemic VF show more overall RR-interval irregularity (RRI) than do STEMI ...
Segal Oliver R OR St. Mary's Hospital, London, UK. - - 2010
Precise mechanisms that initiate ventricular tachycardia (VT) in the intact infarcted human heart have not been defined. The purpose of this study was to investigate the mechanisms that underlie human postinfarct VT initiation. Noncontact mapping of the left ventricle was performed in 9 patients (age 67.1 +/- 7.8 years, ejection ...
Henz Benhur Davi - - 2009
BACKGROUND AND AIMS: Slow conduction scarred areas are related with ventricular tachycardia (VT) arrhythmogenesis in nonischemic cardiomyopathy. The purpose of this study was to characterize the substrate in both epicardial and endocardial surfaces of the left ventricle and to evaluate the effectiveness of substrate mapping and ablation for VT in ...
Sauer William H - - 2010
Long-term outcomes following ablation of ventricular tachycardia (VT) have not been well described. The purpose of this study was to identify the incidence and predictors of mortality following catheter ablation of VT in patients with an implantable cardioverter-defibrillator (ICD). The cohort included in the analysis consisted of patients with ischemic ...
Yusu Satoru - - 2009
BACKGROUND: Intravenous amiodarone (AMD) has been used for the treatment of ventricular tachycardia/fibrillation (VT/VF) in emergency care medicine. However, AMD acts slowly and is occasionally accompanied by hypotension and bradycardia. The antiarrhythmic effect of intravenous nifekalant (NIF) was assessed in patients with VT/VF complicating acute coronary syndrome (ACS) according to ...
Samore Naseer Ahmed - - 2009
OBJECTIVE: To determine the outcome of Radiofrequency Catheter Ablation (RFCA) as a non-pharmacological curative therapy for idiopathic Ventricular Tachycardia (VT) and to identify procedure-related complications. STUDY DESIGN: Descriptive study. PLACE AND DURATION OF STUDY: The Armed Forces Institute of Cardiology and National Institute of Heart Diseases, Rawalpindi, from February 2001 ...
Choo W K - - 2009
Ventricular ectopics can potentially lead to ventricular fibrillation (VF). A case of idiopathic VF that began as ventricular bigeminy is presented. A 30-year-old man lost consciousness transiently while driving but made a complete recovery soon after. He was pale and sweaty at the onset of the event. There was neither ...
Cano Oscar - - 2009
The aim of the study was to define the epicardial substrate and ablation outcome in patients with left ventricular nonischemic cardiomyopathy (NICM) and suspected epicardial ventricular tachycardia (VT). Ventricular tachycardia in NICM often originates from the epicardium. Twenty-two patients with NICM underwent detailed endocardial and epicardial bipolar voltage maps and ...
Sonmez Osman - - 2009
A 84-year-old man presented to the emergency department complaining of chest pain and palpitations. He had no history of coronary artery disease. The 12-lead electrocardiography showed bidirectional ventricular tachycardia (BVT). Coronary angiography revealed severe mid left anterior descending and mid left circumflex lesions. The BVT, in this case, was most ...
Mizusawa Yuka - - 2009
AIMS: We assessed the inducibility of bundle branch reentrant ventricular tachycardia (BBR-VT) with a right bundle branch block (RBBB) configuration in patients with BBR-VT. METHODS AND RESULTS: Eight consecutive patients (5 men, 45+/-18 years old) with inducible BBR-VT were included. We evaluated the clinical and electrophysiological characteristics in these patients ...
Wu Tsu-Juey - - 2009
BACKGROUND: Ventricular fibrillation (VF) during prolonged (>5 min) global ischemia (GI) could be due to repetitive endocardial focal discharges (REFDs). This hypothesis was tested in isolated rabbit hearts. METHODS AND RESULTS: With optical mapping, simultaneous endocardial (left ventricle, LV) and epicardial (both ventricles) activations during VF with prolonged GI were ...
McDonough Marjorie - - 2009
Ventricular tachycardia (VT) is a life-threatening cardiac dysrhythmia requiring emergency medical care. VT is readily recognized on the electrocardiogram. VT is usually caused by ischemic or structural heart disease, electrolyte disturbances, or the effects of drug therapy. Emergency treatment of VT follows the Advanced Cardiac Life Support (ACLS) algorithms for ...
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