Search Results
Results 401 - 450 of 1351
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Schweikert Robert A - - 2003
BACKGROUND: The epicardial location of an arrhythmia could be responsible for unsuccessful endocardial catheter ablation. METHODS AND RESULTS: In 48 patients referred after prior unsuccessful endocardial ablation, we considered percutaneous, subxiphoid instrumentation of the pericardial space for mapping and ablation. Thirty patients had ventricular tachycardia (VT), 6 patients had a ...
Schuchert Andreas - - 2003
External electrocardiographic loop recording permits extended cardiac rhythm monitoring and ECG storage before and after device activation. The purpose of the study was to assess the diagnostic yield of external loop recorders in patients with more than two syncopal events within the last 6 months and a negative tilt table ...
Pruvot Etienne J - - 2003
Despite considerable progress in the management of ischemic heart disease, a substantial proportion of patients continue to experience life-threatening arrhythmic events. The Multicenter Automatic Defibrillator Implantation Trial 2 has recently shown the superiority of implantable cardioverter defibrillators (ICDs) over conventional strategies to prevent sudden death in patients with reduced ejection ...
Rossano Joseph - - 2003
OBJECTIVE: To evaluate efficacy of the recently introduced implantable loop recorder (ILR) in establishing symptom-rhythm correlation in young patients with syncope, near syncope, palpitations, and acute life-threatening events (ALTEs). METHODS: A retrospective study was conducted with patients with ILR from 3 pediatric centers. Inclusion criteria were age <or=25 years and ...
Fung Jeffrey W H - - 2003
Conventional activation or pacemapping is effective in guiding ablation of ventricular tachyarrhythmia originating from right ventricular outflow tract (RVOT). However, in selected patients with hemodynamically unstable or nonsustained tachycardia, noncontact mapping may be an effective alternative method to guide ablation in RVOT. Five patients with symptomatic hypotension during ventricular tachycardia ...
Gurevitz Osnat - - 2003
Patients with ICDs are commonly advised to quit industrial jobs because of concerns that strong electromagnetic fields operating in the industrial environment might interfere with ICD functions. This study was done to assess interactions between industrial equipment and ICDs, and to devise a simple low risk screening protocol. We studied ...
Becker Ruediger - - 2003
At present, patients with documented sustained VT or resuscitated cardiac arrest (CA) are treated with ICDs. The aim of this study was to retrospectively evaluate if a routine electrophysiological study should be recommended prior to ICD implantation. In 462 patients referred for ICD implantation because of supposedly documented VT (n ...
Hsia Henry H - - 2003
BACKGROUND: Although catheter mapping has been used to define the endocardial electrogram characteristics in patients with ventricular tachycardia (VT) and coronary disease, characterization of the electrophysiological substrate in patients with VT and nonischemic cardiomyopathy is limited. METHODS AND RESULTS: Left ventricular endocardial electroanatomical mapping was performed in 19 patients with ...
Matsushita Takehiko - - 2003
To evaluate the significance of inducible sustained ventricular tachycardia (VT) in patients with coronary artery disease and relatively preserved cardiac function, 33 patients who met the following criteria were studied; documented nonsustained VT but no history of life-threatening arrhythmia, inducible sustained VT at electrophysiologic study, and implantation of a cardioverter-defibrillator. ...
Gurevitz Osnat T - - 2003
INTRODUCTION: Upper limit of vulnerability (ULV) has a strong correlation with defibrillation threshold (DFT) in patients with implantable cardioverter defibrillators (ICDs). Significant discrepancies between ULV and DFT are infrequent. The aim of this study was to characterize patients with such discrepancies. METHODS AND RESULTS: The ULV and DFT were determined ...
Becker Rüdiger - - 2003
BACKGROUND: The prognostic role of asymptomatic nonsustained ventricular tachycardia (NSVT) and programmed ventricular stimulation (PVS) in patients with idiopathic dilated cardiomyopathy (IDC) remains controversial. METHODS: The prognostic significance of ventricular arrhythmias, ejection fraction, NYHA class, atrial fibrillation and age for overall and sudden death mortality was prospectively studied in 157 ...
Pezawas T - - 2003
AIMS: To evaluate electrophysiologically guided implantable cardioverter defibrillator (ICD) therapy in patients with syncope, structural heart disease and no documented sustained ventricular tachycardia (sVT). METHODS AND RESULTS: Programmed ventricular stimulation (PVS) was performed in 52 patients (age 62+/-10 years): 40 patients had ischaemic and 12 patients had idiopathic dilated cardiomyopathy. ...
Aquilina Kristian - - 2003
OBJECTIVE: Endoscopic third ventriculostomy (ETV) failure may be abrupt in onset, causing a potentially life-threatening increase in intracranial pressure. ETV failure may also have a more insidious onset, and in these cases, diagnosis on clinical and radiological grounds can be difficult. This study evaluates the usefulness of routine ventricular reservoir ...
Kottkamp Hans - - 2003
INTRODUCTION: The aim of this study was to describe the arrhythmogenic substrate in postinfarction patients with ventricular tachycardia (VT) guiding the placement of individual strategic linear lesions transecting all potential isthmuses using target area maps with limited mapping points to allow short procedure times. METHODS AND RESULTS: In 28 patients ...
Brugada Josep - - 2003
OBJECTIVES: The purpose of this study was to analyze the feasibility, efficacy, and safety of epicardial radiofrequency (RF) ablation in patients with incessant ventricular tachycardia (VT). BACKGROUND: Management of patients with incessant VT is a difficult clinical problem. Drugs and RF catheter ablation are not always effective. A nonsurgical transthoracic ...
Molhoek S G - - 2003
Implantable cardioverter defibrillator (ICD)-therapy prevents sudden death in patients at high risk, but incidence of death due to heart failure remains unaltered. Recent data suggest that biventricular (BV) pacing is useful in patients with heart failure. It is unclear, how many patients with an ICD indication may have an indication ...
Aaronson Keith D - - 2003
Patient selection for left ventricular assist device (LVAD) therapy is the most important process in obtaining a successful outcome. Evaluation requires assessing the appropriateness for device implantation based on need and risk of LVAD implant to the patient. Appropriate patients can be selected without the need for invasive hemodynamic measurements ...
Ouyang Feifan - - 2003
BACKGROUND: In patients with apparently normal hearts, ventricular tachycardia (VT) may only involve the subepicardial myocardium. METHODS AND RESULTS: Four patients with exercise-induced fast VT with right bundle branch block morphology were investigated. ECG showed a small q wave in leads II, III, and aVF during sinus rhythm (SR) in ...
O'Donnell D - - 2003
AIMS: Radiofrequency catheter ablation is considered first line treatment for symptomatic patients with right ventricular outflow tract tachycardia (RVOT). The role of ablation in arrhythmogenic right ventricular dysplasia (ARVD) is more limited. As such, differentiating between the two conditions is essential. METHODS AND RESULTS: This study compared non-invasive findings, magnetic ...
Schless B G - - 2003
High resolution electrocardiography (HRECG) recordings have already shown an increased beat-to-beat microvariability of the QRS duration of the terminal QRS in patients with a history of ventricular tachycardia (VT). The purpose of this study is to detect QRS-duration microvariability with magnetocardiographic (MCG) recordings in normals, patients with coronary heart disease ...
Gillis Anne M - - 2003
INTRODUCTION: Not all patients experience recurrent sustained ventricular tachyarrhythmias after placement of an implantable cardioverter defibrillator (ICD). We evaluated the clinical and electrophysiologic predictors of ventricular tachycardia (VT) and ventricular fibrillation (VF) recurrence following ICD implantation. METHODS AND RESULTS: Consecutive patients (n = 133) underwent 4 +/- 3 serial electrophysiologic ...
Pavri Behzad B - - 2003
Syncope is a transient loss of consciousness and postural tone, with spontaneous recovery, and may represent an episode of aborted cardiac arrest. The final common pathway for loss of consciousness from non-neurologic causes is hypoperfusion of the reticular activating system. The etiology of syncope in older patients frequently includes a ...
Balmelli Nicola - - 2003
BACKGROUND: Recent studies have shown that patient-triggered cardiac event recorders (CER) have an increased diagnostic yield and are more cost effective than conventional 24-h-Holter electrocardiograms (ECGs) for the evaluation of sporadic, potentially arrhythmia-related symptoms. HYPOTHESIS: The aim of this study was to determine the diagnostic yield of a patient-triggered CER ...
Theuns D A M J - - 2003
The expanding indications for ICD therapy and the complexity of current devices will have impact on follow-up policy. The application of ICD therapy requires elaborate attention to technical aspects, arrhythmias, and the clinical course of the underlying disease. Currently, the quality of medical supervision is dependent on scheduled regular follow-up ...
Garcia-Civera Roberto - - 2003
OBJECTIVE: We sought to prospectively assess the diagnostic yielding of a protocol in which electrophysiologic studies (EPS), tilt-table tests (TTTs), and loop recorder implantation are selectively used. BACKGROUND: The optimal strategy in the diagnosis of patients with syncope of unknown cause has not been defined. METHODS: A total of 184 ...
Huuhka Martti J - - 2003
Serious adverse events associated with electroconvulsive therapy (ECT) are uncommon and consist mostly of cardiovascular complications, mainly arrhythmias. The risk of complications is increased in elderly and physically ill patients. In the current study, a 24-hour pre-ECT and 24-hour post-ECT Holter recording was performed on 26 elderly patients during their ...
Jorge M T - - 2003
The frequencies of each type of arrythmia were investigated, by age and sex, among 3056 Brazilian patients with cardiac arrhythmia. Each patient investigated had been tested serologically for American trypanosomiasis and 1013 had been found seropositive for the disease. In general, the seropositive 'chagasic' patients were each likely to be ...
Oh Ju Hyeon - - 2003
Neurocardiogenic syncope is the most common cause of syncope in patients who present in outpatient clinics. Head-up tilt test (HUT) has been widely used to diagnose neurocardiogenic syncope. However, the HUT does not always produce a positive response in patients with suspected neurocardiogenic syncope. The aim of the present study ...
Brembilla-Perrot Béatrice - - 2003
AF is frequent after cardiac surgery. However, ventricular arrhythmias are less known. The purpose of the study was to evaluate the causes and the prognostic significance of severe ventricular arrhythmias occurring after cardiac surgery. For 10 years, among 2,100 cardiac surgeries, 16 (0.8%) patients (13 men, 3 women; age 49-71 ...
Wöhrle J - - 2003
Syncope is defined as a self-limited loss of consciousness, usually combined with falling due to the inability to maintain postural tone. The underlying mechanism is a transient global cerebral hypoperfusion. The aetiology essentially includes cardiac disorders (structured heart disease or arrhythmias), neurally-mediated reflex syndromes, orthostatic hypotension and carotid sinus syndrome. ...
Yetman Anji T - - 2003
OBJECTIVES: We sought to assess outcomes in a series of young patients with Marfan syndrome and to define the prevalence of ventricular arrhythmias in this patient population. BACKGROUND: While sudden death is a well-recognized outcome in Marfan syndrome, ventricular arrhythmias are not well described. METHODS: Patients were followed with echocardiography, ...
Ray Indranill Basu - - 2003
Implanted defibrillators have become mainstream therapy for the prevention of sudden cardiac death from ventricular tachyarrhythmias. A decade of studies has confirmed the superiority of ICDs over antiarrhythmic drug therapy in prolonging the life of patients with a prior history of sustained VT or VF. More recent studies have compared ...
Pyatt J R - - 2003
Undesirable sensing of external sources of electromagnetic interference by ICDs is well known. A transcutaneous electrical nerve stimulation (TENS) device has been reported to interfere with an ICD resulting in an inappropriate shock and patients with implanted defibrillators or pacemakers have been cautioned about the use of such units to ...
Lü Jiagao - - 2003
In order to assess the diagnostic value of invasive electrophysiologic study (EPS) in the patients with unexplained syncope, the electrophysiologic findings of 268 patients with unexplained syncope despite a complete clinical evaluation were analyzed. Results showed positive EPS finding was 38% in total patients and 50% in the patients aged ...
Gasparini Maurizio - - 2003
The flecainide test is widely used in Brugada syndrome. However, its reproducibility and safety remain ill-defined. This study included 22 patients (18 men, mean age 34 years). Mutations in the SCN5A gene were found in eight patients. Two patients had aborted sudden cardiac death, 8 had syncope/presyncope, and 12 were ...
Juang Jyh-Ming - - 2003
Since 1992, the Brugada syndrome has been increasingly recognized worldwide, although its incidence and distribution remain unclear. In Asia, several cases have been reported in Japan, Thailand, Singapore, and Vietnam. However, little information is available from the Chinese population. Since June 1997, we have identified 10 patients with the diagnosis ...
Fisher John D - - 2003
BACKGROUND AND STUDY OBJECTIVE: Conventional programmed electrical stimulation (PES) is useful for establishing inducibility or noninducibility of clinical ventricular arrhythmias (VA), but is complex and time-consuming. This study compared a standard PES protocol with ultrarapid train stimulation (UTS) in a broad range of patients with and without a history of ...
Shinde Abhijit A - - 2003
The efficacy of amiodarone used in combination with a pacemaker cardioverter defibrillator (PCD) to decrease episodes of ventricular tachycardia and subsequent PCD shocks is not clear. We examined a retrospective registry of 82 patients with PCD implantation to define the efficacy of amiodarone treatment. We compared patients treated with amiodarone ...
Sumitomo N - - 2003
To investigate the clinical outcome, ECG characteristics, and optimal treatment of catecholaminergic polymorphic ventricular tachycardia (CPVT), a malignant and rare ventricular tachycardia. Questionnaire responses and ECGs of 29 patients with CPVT were evaluated. Mean (SD) age of onset was 10.3 (6.1) years. The initial CPVT manifestations were syncope (79%), cardiac ...
Weretka Slawomir S Department of Cardiology, Electrophysiology, University Hospital Heidelberg, Bergheimerstr. 58, 69115 Heidelberg, Germany. - - 2003
Modern dual chamber ICD systems are able to overcome various sensing problems. However, improvement of their performance is still required. The aim of this study was to assess the sensing function in 101 consecutive patients (84 men, 17 women; mean age 63 +/- 12 years; mean follow-up 24 +/- 4 ...
Wu Zhong-Kai - - 2002
BACKGROUND: Ventricular fibrillation (VF) and tachycardia (VT) are the common and potential life-threatening complications after CABG. Ischemic preconditioning (IP) has been proved effective in reducing ischemia reperfusion arrhythmia in animals and humans. Whether IP is effective in suppressing postoperative VF/VT in patients with CABG has not been studied. METHODS AND ...
Mitchell L Brent - - 2002
The transvenous-catheter electrophysiologic (EP) study has occupied a central position in the investigation and management of patients with ischemic heart disease and a propensity to ventricular tachycardia (VT) or ventricular fibrillation (VF) for more than 25 years. However, demonstration of the superiority of the implantable cardioverter defibrillator (ICD) compared to ...
Hsia Henry H - - 2002
Dilated cardiomyopathy is a diverse group of heart diseases with variable arrhythmia substrates. The response to programmed stimulation is dependent on spontaneous arrhythmia presentation. In patients with dilated cardiomyopathy, the majority of sustained monomorphic VT is caused by a scar-related reentrant mechanism, similar to that of coronary artery disease. The ...
Buxton Alfred E - - 2002
BACKGROUND: Fifty percent of deaths in patients with coronary disease occur suddenly. Although many factors correlate with increased mortality, there is little information regarding the influence of these factors on mode of death. As such, optimum methods to determine patients most likely to benefit from implantable defibrillator therapy are unclear. ...
Druteika Deon - - 2002
OBJECTIVE: To determine whether bupropion overdose has been associated with cardiovascular toxicity. DATA SOURCES: MEDLINE (1966-January 2002), EMBASE (1980-January 2002), Current Contents (January 2002), and PubMed (January 2002) databases for English-language human reports. Search terms included bupropion, overdose (drug), intoxication, poisoning, and acute ingestion. DATA SYNTHESIS: Articles describing toxicity following ...
Sarasin F P - - 2002
OBJECTIVE: To study the role of echocardiography in the stepwise evaluation of syncope. DESIGN: A prospective observational study with an 18 month follow up. SETTING: University teaching hospital providing primary and tertiary care. SUBJECTS: 650 consecutive patients with syncope and clinical suspicion of an obstructive valvar lesion, or with syncope ...
Ommen Steve R - - 2002
Although the survival benefit conveyed by the automatic defibrillator has been well established for several subsets of patients, some patients who receive the device still die early. The relative lymphocyte count (%L), a portion of the white blood cell count differential, which is decreased in states of excess systemic stress, ...
Donateo P - - 2002
BACKGROUND: The finding of bundle branch block in patients with syncope suggests that paroxysmal AV block may be the cause of syncope, even though its prevalence is unknown. METHODS: We evaluated 55 consecutive patients with syncope and bundle branch block (mean age 75 +/- 8 years; median of two syncopal ...
Baba Akiyasu - - 2002
OBJECTIVES: We sought to test the hypothesis that autoantibodies (Abs) produced against sarcolemmal Na-K-ATPase play a role in the development of ventricular tachycardia (VT) and cardiac sudden death in patients with dilated cardiomyopathy (DCM). BACKGROUND: Autoimmunity is one of the mechanisms of pathogenesis of DCM as well as virus infection ...
Krantz Mori J - - 2002
BACKGROUND: Methadone is an effective treatment for opioid dependency and chronic pain. A methadone derivative, levacetylmethadol, was withdrawn from the European market after being associated with torsade de pointes. To date, no association between methadone and this arrhythmia has been described. OBJECTIVE: To evaluate a series of methadone-treated patients experiencing ...
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