Search Results
Results 51 - 100 of 1466
1 2 3 4 5 6 7 8 9 10 >
Akcay Murat - - 2010
The aim of this study was to investigate the electrocardiographic and echocardiographic predictors of ventricular tachycardia (VT) in patients with classical mitral valve prolapse (MVP). Thirty patients (nine men and 21 women; mean age, 41.5 ± 15 years) in sinus rhythm with mitral valve prolapse who had VT in 24-hour ...
Yokoshiki Hisashi - - 2010
A 12-year-old girl with recurrent palpitation due to idiopathic ventricular tachycardia (VT) with a left bundle branch block configuration and inferior axis was referred to our hospital. During the VT, a spiky presystolic potential (SP) was recorded at the septum of right ventricular outflow tract (RVOT) just below pulmonary valve. ...
Strauss David G - - 2011
Only a minority of patients receiving implantable cardioverter-defibrillators (ICDs) for the primary prevention of sudden death receive appropriate shocks, yet almost as many are subjected to inappropriate shocks and device complications. Identifying and quantifying myocardial scar, which forms the substrate for ventricular tachyarrhythmias, may improve risk stratification. This study sought ...
Jane-Wit Daniel D Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, - - 2011
Adenosine-responsive ventricular tachycardias (VTs) typically occur in patients without structural heart disease; and thus, its association with myocardial ischemia is rare. In this case report, we describe a patient who had demonstrable ischemia along the anterolateral wall of the left ventricle and who developed a VT that was clinically terminated ...
Tereshchenko Larisa G LG Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Baltimore, MD 21287, USA. - - 2010
There is a controversy regarding the association between QRS width and ventricular arrhythmias (VAs). We hypothesized that predictive value of the QRS width could be improved if QRS width were considered in the context of the sum magnitude of the absolute QRST integral in 3 orthogonal leads sum absolute QRST ...
Yoshida Kentaro - - 2010
OBJECTIVES: The purpose of this study was to assess the value of implantable cardioverter-defibrillator (ICD) electrograms (EGMs) in identifying clinically documented ventricular tachycardias (VTs). BACKGROUND: Twelve-lead electrocardiograms (ECG) of spontaneous VT often are not available in patients referred for catheter ablation of post-infarction VT. Many of these patients have ICDs, ...
Ganesan Anand N - - 2011
Noncontact Mapping in Acute Ischemic VF. Aim: The study aim was to determine the utility of noncontact mapping in acute ischemic ventricular fibrillation, by direct comparison with simultaneously acquired multisite contact needle recordings. Materials and Methods: Noncontact mapping has emerged as a promising tool to make percutaneous high-density intracardiac electrical recordings ...
Anyukhovsky Evgeny P EP Department of Pharmacology, Center for Molecular Therapeutics, College of Physicians and Surgeons of Columbia University, 630 West 168 Street, PH 7West-318, New York, NY 10032, USA. - - 2011
acute myocardial ischaemia induces a decrease in resting membrane potential [which leads to reduction of action potential (AP) V(max)] and intracellular acidification (which closes gap junctions). Both contribute to conduction slowing. We hypothesized that ventricular expression of the skeletal muscle Na(+) channel, Nav1.4 (which activates fully at low membrane potentials), ...
Pellegrini Cara N - - 2010
Ventricular tachycardia (VT) may be monomorphic or polymorphic. Although commonly related to organic heart disease, a significant percentage of VTs are idiopathic (occurring in patients with otherwise normal hearts). Correctly identifying the substrate and mechanism of the tachycardia is essential for proper management. Although therapy for monomorphic VT associated with ...
Luo Nian-sang - - 2010
Cardiac resynchronization therapy (CRT) could improve heart function, symptom status, quality of life and reduce hospitalization and mortality in patients with severe heart failure (HF) with optimal medical management. However, the possible adverse effects of CRT are often ignored by clinicians. A retrospective analysis of CRT over a 6-year period ...
Massare Jorge - - 2010
We sought to define the role of interstitial fibrosis in the proarrhythmic phenotype of failing ventricular myocardium. Multiple cellular events that occur during pathological remodeling of the failing ventricle are implicated in the genesis of ventricular tachycardia (VT), including interstitial fibrosis. Recent studies suggest that ventricular fibrosis is reversible, and ...
Mandel Jeff E - - 2011
Remifentanil for Epicardial VT Ablation. Epicardial ablation of ventricular tachycardia (VT) presents multiple challenges for anesthetic management. General anesthesia lowers blood pressure, may interfere with arrhythmia mapping, and use of muscle relaxants precludes identification of the phrenic nerve. We describe a case in which remifentanil with minimal doses of midazolam ...
Duncan Edward - - 2010
We reviewed outcomes in our primary prevention implantable cardioverter defibrillator (ICD) population according to whether the device was programmed with a single ventricular fibrillation (VF) zone or with two zones including a ventricular tachycardia (VT) zone in addition to a VF zone. This retrospective study examined 137 patients with primary ...
Arya Arash - - 2010
A remote magnetic navigation system (MNS) has been used for ablation of ventricular arrhythmias. However, irrigated tip catheter has not been evaluated in large series of patients. To evaluate acute and long-term efficiency of the newly available irrigated tip magnetic catheter for radiofrequency (RF) ablation of scar-related ventricular tachycardia (VT) ...
Wang Samuel - - 2010
Improved mechanistic insights and clinical tools provide increasing diagnostic refinement for ventricular tachycardia in young patients with structurally normal hearts, yielding potentially important prognostic and management implications. The purpose of this study was to survey the clinical characteristics and outcomes of otherwise healthy children with ventricular tachycardia (VT) who were ...
Nakahara Shiro - - 2010
Late potential (LP) electrograms represent areas of slow conduction and are often sites critical to reentrant tachycardia circuits. The distribution of LPs within infarct scar is not known. The purpose of this study was to delineate infarct heterogeneity using ultra high-density mapping and to determine the location of LPs with ...
Gelzer Anna R M - - 2010
To determine the spontaneous variability of ventricular arrhythmias (VA) and evaluate anti-arrhythmic efficacy of mexiletine, sotalol, and a mexiletine-sotalol combination in German shepherd dogs (GSD) with inherited arrhythmias. 12 affected GSD, median age 20 weeks, received mexiletine (8 mg/kg PO q8 h), sotalol (2.5 mg/kg PO q12 h), and combination ...
Song Mi-Kyoung - - 2010
There have been no studies on the clinical characteristics and prognostic factors of pediatric ventricular tachycardia (VT). Eighty-one patients with pediatric VT were studied retrospectively at a single center. The median follow-up period was 6.0 years (0.7-23.5 years). Patients were categorized into 6 groups: idiopathic VT (IVT, n=37), catecholaminergic polymorphic ...
Han Lichy - - 2010
From experiments, we know that the heterogeneity of action potential duration and morphology is an important mechanism of ventricular tachyarrhythmia. Electrocardiogram (ECG) markers of repolarization lability are known; however, lability of depolarization has not been systematically studied. We propose a novel method for the assessment of variability of both depolarization ...
Scirica Benjamin M - - 2010
Most studies examining the relationship between ventricular tachycardia (VT) after acute coronary syndrome and sudden cardiac death (SCD) were performed before widespread use of reperfusion, revascularization, or contemporary medical therapy and were limited to ST-elevation myocardial infarction. The incidence and prognostic implications of VT in patients with non-ST-elevation acute coronary ...
Barsheshet Alon - - 2010
Coronary revascularization (CR) may confer electrical stability in patients with ischemic cardiomyopathy. However, data regarding the effect of CR on the development of ventricular tachyarrhythmias in this population are limited. The purpose of this study was to evaluate the association between CR and arrhythmic risk in postmyocardial infarction (post-MI) patients ...
Kloner Robert A - - 2011
Background: The antianginal agent ranolazine (R) has shown some promise as an antiarrhythmic agent but its mechanism of action is not known. Previously, we have shown that R suppresses ventricular arrhythmias at a concentration >10 μM that may affect multiple ion currents including IKr. Purpose: The present study was carried ...
Nakagawa Harumichi - - 2010
Intravenous application of amiodarone is commonly used in the treatment of life-threatening arrhythmias, but the underlying mechanism is not fully understood. The purpose of the present study is to investigate the acute effects of amiodarone on spiral wave (SW) re-entry, the primary organization machinery of ventricular tachycardia/fibrillation (VT/VF), in comparison ...
Nagai Toshiyuki - - 2010
The aim of the present study was to examine the effect of systemic acidosis on the development of malignant ventricular arrhythmias, including sustained ventricular tachycardia and ventricular fibrillation (VT/VF), after reperfused ST-elevation myocardial infarction (STEMI). A total of 157 consecutive patients with a reperfused STEMI were examined. Patients were divided ...
Lin Chun-Cheng - - 2010
This study proposes a finite-impulse-response (FIR) prediction model to analyze the unpredictable intra-QRS potentials (UIQP) for identifying ventricular tachycardia patients with high-risk ventricular arrhythmias. The simulation study shows that a QRS complex including abnormal intra-QRS potentials (AIQP) has a higher UIQP and UIQP-to-QRS ratio in comparison with one without AIQP. ...
Boulaksil Mohamed - - 2010
Sudden arrhythmogenic cardiac death is a major cause of mortality in patients with congestive heart failure (CHF). To investigate determinants of the increased arrhythmogenic susceptibility, we studied cardiac remodelling and arrhythmogenicity in CHF patients and in a mouse model of chronic pressure overload. Clinical and (immuno)histological data of myocardial biopsies ...
Hisada Tetsuya - - 2010
Ventricular fibrillation diagnoses such as Brugada syndrome pose a risk of sudden incapacitation or death in aircrew. This case report presents a 44-yr-old male fighter pilot who unexpectedly developed ventricular fibrillation (VF) during an electrophysiological study (EPS) prior to therapy for non-sustained ventricular tachycardia (nsVT). The initial aeromedical disposition for ...
Gasparini Maurizio - - 2010
BACKGROUND: This multicenter, prospective, randomized, controlled, parallel trial compares the efficacy of biventricular (BIV) versus right ventricular (RV) antitachycardia pacing (ATP) in terminating all kinds of ventricular tachycardia (VT). METHODS: Five hundred twenty-six patients implanted with a cardiac resynchronization therapy defibrillator (CRT-D) device were enrolled and randomized 1:1 to either ...
Algalarrondo Vincent - - 2010
A 61-year-old man was referred to us for palpitations and ventricular tachycardia. After being treated by chemotherapy for a mediastinum lymphoplasmocytic lymphoma, a ventricular tachycardia (VT) occurred. It was well tolerated. Several imaging techniques showed that this VT was related to a tumoural infiltration of the anterior part of the ...
Pandit Sandeep V - - 2010
Hyperkalemia increases the organization of ventricular fibrillation (VF) and may also terminate it by mechanisms that remain unclear. We previously showed that the left-to-right heterogeneity of excitation and wave fragmentation present in fibrillating guinea pig hearts is mediated by chamber-specific outward conductance differences in the inward rectifier potassium current (I(K1)). ...
Miyamoto Koji - - 2010
EnSite array (EA) provides virtual activation of ventricular tachycardia (VT) and premature ventricular contraction (PVC) on a beat-to-beat basis. Fifty-five consecutive patients (age 52+/-16 years) with 79 VTs/PVCs undergoing EA-guided radiofrequency catheter ablation (RFA) were studied, of whom 7 patients had organic heart diseases. A virtual activation map showed that ...
Kofune Masayoshi - - 2011
A 59-year-old man with premature ventricular contractions (PVCs) and slow ventricular tachycardia (VT) underwent electrophysiologic testing. The left ventricular ejection fraction was 27%. Activation mapping showed the site of earliest activation to be the posterolateral site of the right ventricle inflow tract, and we considered this to be the focal ...
Ghanbari Hamid - - 2010
Ventricular tachycardia (VT) in patients without structural heart disease can be observed in 10% of patients presenting with ventricular arrhythmias. These VTs are characterized by QRS morphology, ventricular origin and their response to pharmacologic agents. It is essential to rule out structural heart disease in this population as this can ...
Nguyen Duy T - - 2010
Post-myocardial infarction (MI) complications include ventricular tachycardia (VT). Excessive non-MI fibrosis, involving the infarct border zone (IBZ) and beyond, is an important substrate for VT vulnerability. This study assessed whether the antifibrotic agent pirfenidone can mitigate fibrosis in remodeling and determined its effects on myocardial function and VT susceptibility in ...
Morin Daniel P - - 2010
The 2 predominant causes of ventricular tachycardia (VT) arising from the right ventricle are arrhythmogenic right ventricular cardiomyopathy (ARVC) and idiopathic VT arising from the right ventricular outflow tract (RVOT). These arrhythmias can be adrenergically mediated and may be difficult to distinguish clinically. A minor criterion for the diagnosis of ...
Aramendi E - - 2010
Since the International Liaison Committee on Resuscitation approved the use of automated external defibrillators (AEDs) in children, efforts have been made to adapt AED algorithms designed for adult patients to detect paediatric ventricular arrhythmias accurately. In this study, we assess the performance of two spectral (A(2) and VFleak) and two ...
Wijnmaalen Adrianus P - - 2010
BACKGROUND: Reperfusion therapy during acute myocardial infarction results in myocardial salvage and improved ventricular function but may also influence the arrhythmogenic substrate for ventricular tachycardia (VT). This study used electroanatomic mapping and infarct histology to assess the impact of reperfusion on the substrate and on VT characteristics late after acute ...
Ceresnak Scott R - - 2010
Several algorithms have been developed to help determine the etiology of wide complex tachycardias (WCTs) in adults. Sensitivity and specificity for differentiating supraventricular tachycardia (SVT) with aberration from ventricular tachycardia (VT) in adults have been demonstrated to be as high as 98% and 97%. These algorithms have not been tested ...
Li Li L Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, - - 2010
Little is known about the three-dimensional (3-D) intramural activation sequences during long-duration ventricular fibrillation (VF), including the role of the subendocardium and its Purkinje fibers (PFs) in long-duration VF maintenance. Our aim was to explore the mechanism of long-duration VF maintenance with 3-D electrical mapping. We recorded 10 min of ...
Brown Aaron Michael - - 2010
Limited information exists about the in-flight use and outcomes associated with automated external defibrillators (AEDs) on commercial airlines. To describe the characteristics and outcomes of AED use during in-flight emergencies including in-flight cardiac arrest and the associated ground medical consultation patterns. We collected cases of AED use that were self-reported ...
Deneke Thomas - - 2010
The ablation of ventricular tachycardia (VT) can be achieved using anatomically guided approaches using differentiated mapping and ablation techniques. The aim of this study was to evaluate the efficacy of limited linear ablation in the VT exit region identified during sinus rhythm mapping alone. One hundred fifteen consecutive patients presenting ...
Pava Luis Fernando - - 2010
Differential diagnosis of wide QRS complex tachycardias using the 12-lead ECG may be difficult in many clinical settings. The purpose of this study was to determine the value of ECG lead II, specifically, the duration at its beginning, defined as R-wave peak time (RWPT), in differentiating ventricular tachycardia (VT) from ...
Sakamoto Tamotsu - - 2010
A 54-year-old man with prior inferior myocardial infarction suffered from monomorphic ventricular tachycardia (VT) with narrow QRS complex of 120 ms. During VT, a fragmented prepotential preceding QRS onset by 30 ms at the right ventricular posterior septum and a late diastolic potential preceding QRS onset by 70 ms at ...
Schneider Heike E - - 2010
Idiopathic ventricular tachycardia (VT) in children with a structurally normal heart can cause significant morbidity, and although rare, mortality. Conventional activation and pace mapping may be limited by nonsustained tachycardia or unstable hemodynamics. The aim of this study was to assess feasibility of catheter ablation of idiopathic VT in the ...
Ding Chunhua - - 2010
BACKGROUND: Ventricular tachycardia (VT) is a common cause of mortality in post-myocardial infarction (MI) patients, even in the current era of coronary revascularization treatment. We report a reproducible VT model in rats with chronic MI induced by ischemia-reperfusion and describe its electrophysiological characteristics using high-resolution optical mapping. METHODS: An MI ...
Aronow W S - - 2010
Underlying causes of ventricular tachycardia (VT) or complex ventricular arrhythmias (VA) should be treated if possible. Anti-arrhythmic drugs should not be used to treat asymptomatic patients with complex VA and no heart disease. Beta blockers are the only antiarrhythmic drugs that have been documented to reduce mortality in patients with ...
Hyytinen-Oinas Miia K - - 2010
AIMS: To assess the association of electrocardiographic repolarization and depolarization patterns to vulnerability to ventricular tachyarrhythmias. METHODS: In the present case-control study, a 12-lead ECG, signal-averaged ECG (SAECG), T-wave and QRS morphology, and T-wave alternans (TWA) were analyzed in post-MI patients with and without documented sustained ventricular tachycardia (VT) or ...
Herweg Bengt - - 2010
This report describes the clinical course of a patient with left ventricular assist device (LVAD) and refractory ventricular tachycardia (VT) who underwent successful left ventricular (LV) mapping and ablation complicated by the presence of a bioprosthetic aortic and a mechanical mitral valve. LV catheterization was achieved by crossing the mechanical ...
Maluski Alexandre - - 2010
In the chronic phase of myocardial infarction, the presence of scar areas allows the development of macro-reentries which become the most frequent mechanism underlying ventricular tachycardia (VT). A focal mechanism has been already described in the presence of scar in animal models or in humans but only during surgery. We ...
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 ...
1 2 3 4 5 6 7 8 9 10 >