Search Results
Results 301 - 350 of 1350
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Chinushi Masaomi - - 2005
Vasospastic angina (VSA) and Brugada syndrome (BS) are classified into different categories of cardiac disease, but both can be causes of sudden cardiac death from ventricular fibrillation (VF). The coexistence of VSA and BS in the same patient is possible, and this raises several questions: (1) what is the incidence ...
Abello Mauricio - - 2006
AIMS: We sought to determine the incidence, mechanisms, and time to syncope recurrence in patients with spontaneous syncopal monomorphic ventricular tachycardia (SyMVT) treated with an implantable cardiac defibrillator (ICD). METHODS AND RESULTS: Incidence and causes of syncope following ICD implantation in consecutive patients (n=26) with spontaneous SyMVT were compared with ...
Kula Serdar - - 2005
AIMS: To assess the relation between the timing of syncopal attacks and tilt test positivity. METHOD AND RESULTS: Prospective comparisons of distribution of syncopal attacks in 49 consecutive neurally mediated cardiac syncope (NMCS) patients (19 boys, 30 girls, mean age 13.7+/-0.68) were evaluated. Head-up tilt test (HUT) was positive in ...
Shukla Gunjan - - 2005
BACKGROUND: Hemodynamic improvement from biventricular pacing is well documented; however, its electrophysiologic effects have not been systematically studied. Sporadic case reports suggest a proarrhythmic effect of biventricular pacing resulting primarily in polymorphic ventricular tachycardia/ventricular fibrillation (VT/VF). OBJECTIVES: The purpose of this study was to report a series of patients in ...
Brembilla-Perrot Béatrice - - 2005
Aim: The purpose of this study was to determine the factors associated with the induction of ventricular flutter/fibrillation (VFl/VF)and its prognostic significance in post-myocardial infarction. METHODS: Programmed ventricular stimulation was performed after myocardial infarction (MI) for syncope (n = 232) or systematically (n = 755); 230 patients had an induced ...
Pinter Arnold - - 2005
Patients with an implantable defibrillator may require concomitant antiarrhythmic drug therapy to reduce therapy from the device, especially shocks from the device. New evidence suggests that amiodarone, in combination with b-blockade, is the most effective treatment to reduce the frequency of defibrillator therapies, but sotalol and azimilide have also been ...
Krivan Lubomír - - 2005
BACKGROUND: A common ICD therapy-related complication is arrhythmic storm (AS). The objective of our study was to define the impact of AS on patients' prognoses in order to compare the total mortality of AS patients with the rest of the group. MATERIAL/METHODS: We studied 138 patients who received ICDs between ...
Almquist Adrian K - - 2005
BACKGROUND: Implantable cardioverter-defibrillators (ICDs) are used with increasing frequency in hypertrophic cardiomyopathy (HCM) patients of all ages for primary and secondary sudden death prevention. Concerns may arise regarding the safety of device implantation because of unique clinical and phenotypic expressions of HCM. OBJECTIVES: The purpose of this study was to ...
Prudente Liza A - - 2005
The implantable cardioverter defibrillator (ICD), approved for use in 1985, is used to treat potentially lethal ventricular arrhythmias by delivering an electrical impulse to the heart to convert the rhythm back to normal. Since that time, newer studies, such as MADIT II and SCD-HeFT, demonstrated the expanding utility of the ...
Gula Lorne J - - 2005
OBJECTIVE: To assess the efficacy and safety of laser-assisted lead extraction for upgrade of existing pacemakers and defibrillators in patients with central venous obstruction. BACKGROUND: Implantable cardiac defibrillators and biventricular pacing have become the accepted therapeutic measures for patients with congestive heart failure. Many patients who are candidates for device ...
Christensen Jeppe Hagstrup - - 2005
AIM: To investigate the relationship between serum content of n-3 polyunsaturated fatty acids (PUFA) and the incidence of ventricular arrhythmias in patients with an implantable cardioverter defibrillator (ICD). METHODS: We included 98 patients with ischaemic heart disease and an ICD. The numbers of ventricular fibrillation (VF) and ventricular tachycardia (VT) ...
Deneke T - - 2005
The treatment especially of frequent ischemic VT remains a challenge for medical and catheter ablation procedures. We evaluated the efficacy of a substrate-based procedure to eliminate clinical VTs in this patient collective. METHODS: In 25 consecutive patients (ejection fraction 37+/-12%) with frequent symptomatic medically refractory ischemic VT (with recurrent ICD-shocks), ...
Verma Atul - - 2005
BACKGROUND: Multiple morphologies, hemodynamic instability, or noninducibility may limit ventricular tachycardia (VT) ablation in patients with arrhythmogenic right ventricular dysplasia (ARVD). Substrate-based mapping and ablation may overcome these limitations. We report the results and success of substrate-based VT ablation in ARVD. METHODS AND RESULTS: Twenty-two patients with ARVD were studied. ...
Kirilmaz Ata - - 2005
OBJECTIVE: This study was designed to test defibrillation threshold (DFT) with the least number of fibrillation inductions using upper limit of vulnerability (ULV) and to describe the most practical set of ICD during DFT following implantation. BACKGROUND: Although the correlation between ULV and DFT has been well described, there has ...
Sweeney Michael O - - 2005
BACKGROUND: Implantable cardioverter defibrillators (ICDs) reduce mortality in primary and secondary prevention. Quality of life, mortality, appropriate therapies for specific ventricular rhythms, and inappropriate therapies for supraventricular tachycardia (SVT) were compared among 582 patients (primary prevention=248; secondary prevention=334) in PainFREE Rx II, a 634-patient prospective, randomized study of antitachycardia pacing ...
Schuchert Andreas - - 2005
The aims of this study were to assess the frequency of traumatic injuries in patients with syncope and apparently normal hearts and their influence on the diagnostic evaluation and recurrence of syncope. Patients presenting with syncope before head-up tilt testing frequently had a history of syncope-related injuries. Syncope-related injuries seemed ...
Russo Andrea M - - 2005
OBJECTIVES: The purpose of this study was to (1) determine how often implantable cardioverter-defibrillator (ICD) system modifications were needed to obtain an adequate safety margin for defibrillation, (2) identify how often and for what indications defibrillation threshold (DFT) testing was not performed, and (3) identify factors predicting the need for ...
Arya Arash - - 2005
BACKGROUND: The diagnostic yield of Holter monitoring in patients with syncope is variably reported to be between 6%-20%. This study was done to define predictors of arrhythmic events during the second day of Holter monitoring in patients whose first day Holter recording was normal. METHODS AND RESULTS: Two serial 24-hour ...
Mönnig Gerold - - 2005
OBJECTIVES: The purpose of this study was to evaluate retrospectively a single-center experience with the use of ICDs in patients with long QT syndrome (LQTS) concerning outcome, complications, and optimal programming. BACKGROUND: Use of implantable cardioverter-defibrillator (ICD) in patients with congenital LQTS is controversial but is generally accepted in high-risk ...
Staniforth A D - - 2005
To determine whether ventricular arrhythmia related to nocturnal hypoxaemia during Cheyne-Stokes respiration (CSR) explains the observation that CSR is an independent marker of death in heart failure. Prospective, observational study. 101 patients at high risk of clinical serious ventricular arrhythmia fitted with an implantable cardioverter-defibrillator (ICD). Patients were studied at ...
Brilakis Emmanouil S - - 2005
BACKGROUND: The role of programmed ventricular stimulation (PVS) in patients with idiopathic dilated cardiomyopathy (DCM) and syncope receiving implantable cardioverter-defibrillators (ICD) remains controversial. METHODS AND RESULTS: Between 1994 and July 2002, 20 patients with DCM and syncope underwent PVS and ICD implantation at the Onassis Cardiac Surgery Center or the ...
Wood Mark A - - 2005
Temporal patterns of ventricular tachyarrhythmias. INTRODUCTION: The objective of this study was to test whether the temporal patterns of ventricular tachyarrhythmia recurrences in patients with implantable cardioverter-defibrillator (ICD) follow a random or a clustered distribution. METHODS: Data analysis was conducted using the Medtronic (Minneapolis, MN) Gem DR database of 521 ...
Srivathsan Komandoor - - 2005
In up to 10% of patients who present with ventricular tachycardia (VT), obvious structural heart disease is not identified. In such patients, causes of ventricular arrhythmia include right ventricular outflow tract (RVOT) VT, extrasystoles, idiopathic left ventricular tachycardia (ILVT), idiopathic propranolol-sensitive VT (IPVT), catecholaminergic polymorphic VT (CPVT), Brugada syndrome, and ...
Hachiya Hitoshi - - 2005
Idiopathic right ventricular outflow tract-ventricular tachycardia (RVOT-VT) generally occurs when sympathetic nervous system activity is increased, though, in a few patients, it develops when parasympathetic nervous activity (PNA) is increased. Among 101 consecutive patients with RVOT-VT confirmed by endocardial catheter mapping, 5 (4.9%) presented with nocturnal RVOT-VT. Autonomic nervous balance ...
Gunderson Bruce D - - 2005
Implantable cardioverter defibrillators (ICD) lead dysfunctions can cause inappropriate shocks. Current ICDs store lead diagnostics and detected episodes. This stored information with intracardiac electrograms (EGM) and sensed RR interval patterns may characterize the ICD lead performance. The aim of this analysis was to determine the sensitivity and positive predictive value ...
Lombardi Federico - - 2005
AIMS: In about 30% of patients with syncope, the responsible mechanisms remain unrecognised. Nevertheless, the possibility of an arrhythmic aetiology remains, however, difficult to rule out. METHODS: We therefore monitored with an implantable loop recorder (ILR, Reveal Plus, Medtronic) 34 subjects (60+/-15 years) with at least two unexplained syncopal episodes ...
Champagne Jean - - 2005
BACKGROUND: The recurrence of cardiac events in patients with idiopathic ventricular fibrillation (VF) excluding patients with the Brugada syndrome is unclear since this entity remains present in previous studies. METHODS: Since 1992, 18 patients (72% male) with idiopathic VF out of 455 ICD implants were treated with an implantable cardioverter ...
Ajiro Youichi - - 2005
Risk stratification for life-threatening arrhythmic events in Brugada syndrome is not yet established. The aim of the present study was to examine the usefulness of various markers in predicting life-threatening arrhythmic events in the Brugada syndrome. Forty-six patients with Brugada-type ECGs were categorized into the symptomatic (n=28) and asymptomatic (n=18) ...
Kim Phil Ho - - 2004
Head-up tilt testing (HUT) is a useful diagnostic tool for evaluating suspected neurocardiogenic syncope. Although arrhythmic events during HUT have been occasionally reported, their incidence in a large number of patients is unknown. We aimed to assess the incidence and clinical significance of arrhythmic events in patients with suspected neurocardiogenic ...
Chan Wan Leong - - 2004
BACKGROUND: Vasovagal and vasodepressor syncope are used interchangeably in the literature to describe the common faint syndrome, now collectively named neurally mediated syncope. The significance of heart rate (HR) in these reflex-induced reactions remains unclear. Hypothesis: The study was undertaken to investigate the hemodynamic significance of HR in tilt-induced neurally ...
Verma Atul - - 2004
INTRODUCTION: Electrical storm (ES) is characterized by either refractory ventricular tachycardia (VT) or ventricular fibrillation (VF). However, little is known about the prevalence, predictors, and mortality implications of the causative arrhythmia in ES. We sought to assess the prevalence, predictors, and survival significance of VT and VF as the causative ...
Marchlinski Francis E - - 2004
BACKGROUND: To gain insight into the pathogenesis of right ventricular (RV) cardiomyopathy and ventricular tachycardia (VT), we determined the clinical and electroanatomic characteristics and outcome of ablative therapy in consecutive patients with (1) RV dilatation, (2) multiple left bundle-branch block (LBBB)-type VTs, and (3) an abnormal endocardial substrate defined by ...
Morillo Carlos A. - - 2004
Syncope, defined as a transient loss of consciousness and postural tone with spontaneous recovery and no neurologic sequelae, is among one of the most common causes of consultation with a physician. The diagnostic workup is complex but can be simplified if focused on the underlying condition. Prognosis is highly dependent ...
Joseph George K - - 2004
CONTEXT: The rate of ICD implantation of has grown substantially after results of primary and secondary prevention trials have demonstrated mortality superiority over pharmacologic therapy. Although transtelephonic monitoring is routine for pacemaker follow-up there is no systematically collected data supporting remote interrogation and monitoring (RIM) of ICD patients. OBJECTIVE: To ...
Brembilla-Perrot B - - 2004
A wide QRS complex tachycardia suggests a ventricular tachycardia (VT); but supraventricular tachycardia (SVT) is also possible. Some authors reported on the electrocardiographic signs for the differential diagnosis of VT and SVT with aberrancy. Frequently these signs are debatable and the diagnosis is uncertain. The purpose of the study was ...
Krahn Andrew D - - 2004
Syncope is a complex clinical syndrome with multiple etiologies that can be very difficult to diagnose. The major obstacles to diagnosis are the periodic and unpredictable nature of events and the high spontaneous remission rate. Short-term electrocardiographic monitoring is often unproductive in patients when initial non-invasive testing is negative, particularly ...
Galetta Fabio - - 2004
The aim of the present study was to assess the cardiovascular autonomic function and responses to tilt test in young and elderly patients with syncope of unknown origin. We evaluated two groups of patients with previous unexplained syncope: 192 older subjects (112 males, 80 females, mean age 67.2 +/- 6.8 ...
Lu Chih-Cherng - - 2004
Orthostatic intolerance affects an estimated 1 in 500 persons and causes a wide range of disabilities. After essential hypertension, it is the most frequently encountered dysautonomia, accounting for the majority of patients referred to centers specializing in autonomic disorders. Patients are typically young females with symptoms such as dizziness, visual ...
Bloomfield Daniel M - - 2004
BACKGROUND: In 2003, the Centers for Medicaid and Medicare Services recommended QRS duration as a means to identify MADIT II-like patients suitable for implanted cardiac defibrillator (ICD) therapy. We compared the ability of microvolt T-wave alternans and QRS duration to identify groups at high and low risk of dying among ...
Belhassen Bernard - - 2004
BACKGROUND: Automatic implantable cardioverter-defibrillator therapy is considered the only effective treatment for high-risk patients with Brugada syndrome. Quinidine depresses I(to) current, which may play an important role in the arrhythmogenesis of this disease. METHODS AND RESULTS: The effects of quinidine bisulfate (mean dose, 1483+/-240 mg) on the prevention of inducible ...
Shedd Omer L - - 2004
OBJECTIVES: The goal of this study was to determine whether the World Trade Center (WTC) attack on September 11, 2001, had an effect on the occurrence of ventricular arrhythmias among patients with implantable cardioverter-defibrillators (ICDs) living in Florida. BACKGROUND: Increased frequencies of ICD therapies for ventricular arrhythmias were reported among ...
Steinberg Jonathan S - - 2004
OBJECTIVES: This study was designed to evaluate whether the destruction of the World Trade Center (WTC) on September 11, 2001 (9/11), led to an increased frequency of ventricular arrhythmias among patients fitted with an implantable cardioverter-defibrillator (ICD). BACKGROUND: The WTC attack induced psychological distress. Because ICDs store all serious arrhythmias ...
Ziegelstein Roy C - - 2004
Syncope and near-syncope are great diagnostic challenges in medicine. On the one hand, the symptom may result from a benign condition and pose little or no threat to health other than that related to falling. On the other hand, syncope or near-syncope can be the manifestation of a serious underlying ...
Suzuki Masaru - - 2004
STUDY OBJECTIVE: Cardiovascular disease mortality is affected by ethnic differences and is lower in Japan than in Western countries. Although patients with cardiac syncope have significantly higher mortality than patients with noncardiac syncope in Western countries, no such phenomenon has been described in Japan. The aim of this study is ...
Kato Masaya - - 2004
BACKGROUND: The restoration of coronary flow after transient ischemia immediately induces life-threatening ventricular tachyarrhythmias. Although most of these arrhythmias disappear spontaneously, some of them induce serious hemodynamic changes. This retrospective study investigates the efficacy of therapy with intracoronary verapamil to terminate reperfusion-induced ventricular tachyarrhythmias in patients with acute myocardial infarction ...
Messali Anne - - 2004
Inappropriate therapy due to noise oversensing caused a true ventricular fibrillation (VF) and death of a patient. A 49-year-old patient with a history of dilated cardiomyopathy received a double-chamber implantable cardioverter defibrillator (ICD) in 1991 for a sustained inducible ventricular tachycardia (VT). One appropriate shock delivered in 1994 terminated an ...
Väisänen Olli - - 2004
The occurrence of arrhythmias and haemodynamic changes was studied prospectively in 226 consecutive patients who received prehospital thrombolysis for acute ST-elevation myocardial infarction (STEMI) in two Helicopter Emergency Medical Service (HEMS) systems in Southern Finland. Of the 226 patients, 129 were classified as receiving early (pain to treatment-time <90 min) ...
Krahn Andrew D - - 2004
BACKGROUND: Although electrocardiographic monitoring during syncope is the most unambiguous method of diagnosing or excluding an arrhythmia, it requires recurrence of syncope with potential morbidity. We hypothesized that long-term monitoring of patients with syncope would yield significant asymptomatic abnormalities that might preclude waiting for recurrence of actual syncope. METHODS: Sixty ...
Evonich Rudolph F - - 2004
BACKGROUND: Mortality benefit from implantable cardioverter defibrillator (ICD) therapy in ischemic cardiomyopathy (ICM) with non-sustained ventricular tachycardia (NS-VT) and inducible VT is well defined. Although NS-VT may suggest an increased risk of sudden cardiac death (SCD) in non-ischemic cardiomyopathy (NICM), the role of ICD therapy is unclear. This retrospective study ...
Omar A R - - 2004
The indication for permanent pacemaker remains controversial in malignant neurocardiogenic syncope. A highly reproducible prolonged pause during a repeat head-up tilt-table testing may identify a subgroup of neurally mediated syncope with a prominent and consistent cardioinhibitory component. Seven patients (3 females) with a mean age of 30 years (23-44 years) ...
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