Search Results
Results 601 - 650 of 1351
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Rabinovich R - - 1999
The time to first ICD shock has been extensively studied in patients with coronary artery disease (CAD). However, there are no published data on ICD shocks in patients with Chagas cardiomyopathy (ChC). The occurrence of the first appropriate ICD shock during the first 6 months of follow-up in 20 patients ...
Best P J PJ Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota, - - 1999
Bradycardia support by ICDs has been limited to fixed rate, ventricular pacing. Concomitant placement of a pacemaker and an ICD exposes a patient to potentially life-threatening device interactions. ICDs capable of dual chamber pacing have recently become available. The number of ICD recipients who stand to benefit from the addition ...
Newby K H - - 1998
BACKGROUND: Sustained ventricular tachycardia (VT) and fibrillation (VF) occur in up to 20% of patients with acute myocardial infarction (MI) and have been associated with a poor prognosis. The relationships among the type of arrhythmia (VT versus VF or both), time of VT/VF occurrence, use of thrombolytic agents, and eventual ...
Boyle N G - - 1998
Three cases of twiddler's syndrome in patients with an abdominally implanted cardioverter defibrillator (ICD) and an endocardial lead system are reported. The condition was detected when an increase in pacing threshold or lead impedance was noted at routine follow-up. Successful revision was possible in all patients; however, a recurrence in ...
Wang C H - - 1998
Dobutamine echocardiography was performed in 55 patients with syncope which was clinically suspected to be angina-related. We evaluated the value of using a single test, dobutamine echocardiography, in differentiating real ischemia-related from vasovagal syncope which was diagnosed by a tilt test. During testing, supraventricular arrhythmia was provoked in four (7.2%) ...
Singer I - - 1998
Thoracotomy patch leads used for implantable cardioverter defibrillators (ICDs) are generally safe and effective. We describe two patients in whom a late complication of patch lead migration occurred years after the original implants, causing a bronchopleural fistula in one and lingular lobe collapse in the other patient. We conclude that ...
Natale A - - 1998
Previous work had demonstrated a reduced specificity associated with head-up tilt protocols using high-dose isoproterenol in patients between 20 and 50 years of age. We evaluated the specificity of head-up tilt testing using different isoproterenol infusion doses and administration of nitroglycerin in patients aged >60 years. In addition, whether the ...
Rüppel R - - 1998
OBJECTIVE: The purpose of this study was to use the electrogram storage capabilities of the implantable cardioverter-defibrillator (ICD) to categorize any arrhythmic event during follow-up in a group of patients who had survived an episode of ventricular fibrillation (VF) and to possibly identify clinical predictors of future arrhythmic events. BACKGROUND: ...
Grimm W - - 1998
The relation between heart rate variability (HRV) and outcome of head-up tilt testing (HUT) in patients with neurally mediated syncope (NMS) was studied in 30 patients with presumed NMS (33 +/- 13 years) and in 11 age-matched controls. After 15 minutes of baseline supine observation, patients were tilted to 60 ...
Gill J S - - 1998
Initiating sequences for VT may infer the underlying arrhythmogenic mechanisms. This study examines the initiating sequences of exercise induced idiopathic VT of left bundle branch block-like (LBBB-like) morphology and makes an attempt to relate these to clinical aspects and the mechanisms of arrhythmia. Thirty-two patients (mean age 33.4 +/- 13.2 ...
Grimm W - - 1998
OBJECTIVES: This study investigated the role of programmed ventricular stimulation (PVS) for arrhythmia risk prediction in patients with idiopathic dilated cardiomyopathy (IDC) and spontaneous nonsustained ventricular tachycardia (VT). BACKGROUND: Nonsustained VT in patients with IDC has been associated with a high incidence of sudden cardiac death. METHODS: Over the course ...
Teo W S - - 1998
Sudden cardiac death has been reported in patients with a unique electrocardiographic (ECG) abnormality showing right bundle branch block and ST segment elevation in the precordial leads. This syndrome was first described by Brugada and Brugada and has not been previously described in a Chinese population. We report here the ...
Gardini A - - 1998
The prognosis of patients with neurally mediated syncope and asystolic response at tilt test is controversial and there is no consensus regarding their management. Many patients seem to benefit from beta-blockers and their effectiveness has been assessed with repeated tilt tests in asystolic patients as well. However, little is known ...
Holzberger P T - - 1998
BACKGROUND: Intravenous procainamide hydrochloride is frequently used in the acute care setting and during electrophysiologic testing, but intravenous quinidine gluconate is rarely used because of concerns about its safety. This study prospectively compares the hemodynamic and electrophysiologic effects of these agents in patients undergoing electrophysiologic testing. METHODS AND RESULTS: Sixty-five ...
Barold H S - - 1998
This study was designed to evaluate the ability to distinguish between supraventricular tachycardias (SVTs) and ventricular tachycardias (VTs) based on onset, stability, and width criteria in an implantable defibrillator. Inappropriate detection of atrial fibrillation and sinus tachycardia is a common problem in patients with implantable defibrillators. The onset, stability, and ...
Hua W - - 1998
OBJECTIVE: To summarize our experience in 22 patients who had attempted nonthoracotomy implantable cardioverter-defibrillators (ICD) for malignant ventricular arrhythmias (VA). METHODS: Indications for implantation were ventricular fibrillation (VF) in 17 patients and refractory ventricular tachycardia in 5. Thirteen patients of them had underlying ischaemic heart disease. Seven had dilated cardiomyopathy ...
Trappe H J - - 1998
Motor-vehicle driving restrictions for patients with implantable cardioverter-defibrillators (ICDs) vary widely throughout the world because safety concerns have never been adequately resolved in this patient population. To address this issue, we examined the driving behavior of 291 ICD patients to correlate the frequency of device therapy during driving, the occurrence ...
Chevalier P - - 1998
STUDY OBJECTIVES: To evaluate prospectively, the tolerability and safety of intravenous cibenzoline therapy, for the cardioversion of spontaneous monomorphic ventricular tachycardia (VT). SETTING AND PATIENTS: Between February 1990 and December 1996, fifty-eight patients aged 59+/-10 years old (fifty-three males, five females), with spontaneous VT not causing cardiac arrest, received intravenous ...
Janousek J - - 1998
This study was designed to assess adverse effects of oral propafenone in a large number of pediatric patients. Retrospective data from 27 European centers covering 772 patients treated with oral propafenone were analyzed. The following arrhythmias were treated: reentrant supraventricular tachycardia in 388 patients, atrial ectopic tachycardia in 66, junctional ...
Orditura M - - 1998
Based on our previous experience in doxorubicin-treated patients, in whom we observed a significant increase of ventricular recovery time indexes, we analyzed these non- invasive parameters of myocardium electrical instability in forty-three 5-fluorouracil-treated patients, to test the hypothesis of a mechanoelectrical disarrangement occurring in 5-fluorouracil (5FU) cardiotoxicity. All patients enrolled ...
Hui R C - - 1998
The upper limit of vulnerability is the strength above which ventricular fibrillation is no longer inducible with a shock delivered during the vulnerable phase of the cardiac cycle. It has been demonstrated that the upper limit of vulnerability correlates with the defibrillation threshold in a paced rhythm. The purpose of ...
Del Rosso A - - 1998
BACKGROUND: Head-up tilt testing is extensively used to determine the vasovagal origin of syncope in patients with otherwise unexplained loss of consciousness, although issues remain regarding the method of the test. The diagnostic value of a shortened head-up tilt test potentiated with sublingual nitroglycerin was assessed in patients with unexplained ...
Furushima H - - 1998
Two patients with long QT syndrome, who had episodes of syncope, underwent recordings of the monophasic action potential (MAP) from the right ventricle. Intracoronary administration of acetylcholine (ACh) induced prolongation of MAP duration and caused Torsade de Pointes (Tdp) in both patients. In one patient, intravenous atropine administration did not ...
Bänsch D - - 1998
OBJECTIVES: This retrospective study was undertaken to provide information on occurrence, risk prediction and prevention of syncope in patients with an implantable cardioverter-defibrillator (ICD). BACKGROUND: ICDs effectively terminate ventricular tachycardia and fibrillation (VT/VF). Incapacitating symptoms, such as syncope, may still occur. METHODS: We performed a retrospective analysis of data from ...
Bikkina M - - 1998
PURPOSE: The purpose of this study is to determine whether short-term heart rate variability (HRV) can be used successfully to predict inducible ventricular tachycardia (VT). METHODS: A high-speed (300 mm/s) electrocardiographic recording was obtained in 32 patients in the supine position prior to programmed ventricular stimulation. Beat-to-beat RR intervals (in ...
Didangelos T P - - 1998
Patients with diabetic autonomic neuropathy (DAN) have an increased cardiovascular mortality rate compared with diabetic patients without DAN. Heart rate variability (HRV) time and frequency domain indices are strong predictors of malignant arrhythmias and sudden cardiac death. This prospective, randomised, double-blind, placebo-controlled study analysed the long-term effect of an aldose ...
Zhu D W - - 1998
Fifty-three consecutive patients with hypertrophic cardiomyopathy (HCM) and no history of sudden death underwent electrophysiology (EP) study. Sustained polymorphic ventricular tachycardia (VT) or ventricular fibrillation (VF) was induced in 19 patients (35%). Patients with prior syncope or near syncope had a higher incidence of VT/VF inducibility. An implantable cardioverter defibrillator ...
Tsavaris N B - - 1998
On the basis of the safety of the 1-h paclitaxel infusion schedule in prior studies we attempted to evaluate the feasibility of a shorter infusion schedule (< 1-h), given the general lack of published data or of attempts at applying this strategy. Before receiving paclitaxel, all patients were premedicated with ...
Schuster P M - - 1998
This article describes the relationships between anxiety, self-efficacy, as well as the psychosocial and physiological experiences of patients with an internal cardioverter defibrillator (ICD). Although survival rates with ICDs are impressive, patients experience psychological and physiological responses to their lifesaving devices. Thirty-nine patients completed questionnaires during outpatient clinic visits. Patients' ...
De Ambroggi L - - 1997
BACKGROUND: Nonuniform recovery of ventricular excitability has been demonstrated to facilitate the reentry circuits leading to the development of ventricular tachyarrhythmias. This can also occur in arrhythmogenic right ventricular dysplasia (ARVD). In fact, in patients with ARVD, abnormalities of ventricular repolarization are often observed on 12-lead ECGs, but their predictive ...
Brignole M - - 1997
BACKGROUND: ATP and its related nucleoside, adenosine, are ubiquitous biological compounds with potent depressant activity on the atrioventricular node. We hypothesized that an increased susceptibility of the atrioventricular node to adenosine may, in some cases, play a role in the genesis of syncope. METHODS AND RESULTS: The study was performed ...
Tsai C F - - 1997
Ventricular tachycardia (VT) without structural heart disease or any identifiable predisposing causes for arrhythmia is an uncommon but well-recognized clinical entity. The purpose of this study is to assess the results of catheter ablation therapy and the long-term outcome of patients with idiopathic monomorphic VT in a large patient group. ...
Rothman S A - - 1997
BACKGROUND: Radiofrequency (RF) catheter ablation is effective therapy for monomorphic ventricular tachycardia (VT) in patients without structural heart disease. In patients with postinfarction VT; however, this procedure has been used predominantly as adjunctive therapy, targeting only the patient's clinically documented arrhythmia. By targeting all inducible, sustained VT morphologies, we sought ...
Ilia R - - 1997
BACKGROUND: Exercise testing is an important diagnostic and prognostic procedure in the assessment of patients with ischemic heart disease, arrhythmia and hypertension. OBJECTIVE: The purpose of this study was to determine the reasons for referral and the safety of exercise testing in the community. METHODS: The records of 38,970 patients ...
Lacroix D - - 1997
Occasionally, the cardioinhibitory response may be profound during tilt induced syncope. Whether this response is associated with more severe symptoms or predicts a poor response to pharmacotherapy remains controversial. The aim of this study was to characterize patients with vasovagally mediated asystole occurring during head-up tilt test and to evaluate ...
Taneja T - - 1997
INTRODUCTION: The purpose of this study was to evaluate the immediate reproducibility of local electrogram characteristics recorded during repeated episodes of induced ventricular fibrillation (VF) in patients undergoing implantable cardioverter defibrillator (ICD) implantation. METHODS AND RESULTS: Power spectral analysis (using a fast Fourier transform algorithm) of electrograms recorded during 3 ...
Günal N - - 1997
Ventricular and supraventricular arrhythmias and conduction disturbances were evaluated by routine electrocardiography and 24-hour ambulatory monitoring in 31 patients who underwent correction of tetralogy of Fallot. The interval from operation to the study was 1 month to 14 years (mean 4.8 +/- 2.8). Complete right bundle branch block occurred in ...
Militianu A - - 1997
INTRODUCTION: Implantable cardioverter defibrillators (ICDs) are occasionally used in presumed high-risk patients with electrocardiographically undocumented syncope, although the incidence of ventricular tachyarrhythmias in this population is not well defined. METHODS AND RESULTS: We studied 33 consecutive patients receiving an ICD (67% nonthoracotomy and 70% tiered therapy) after electrophysiologic testing for ...
Dunbar S B - - 1997
Living with a serious ventricular dysrhythmia and its treatment poses certain psychological stressors including anxiety, depression, fear, and a sense of loss of control. Additional stressors related to side effects and technology issues may be present depending on whether the patient is treated with antidysrhythmic medications, an internal cardioverter defibrillator, ...
Giorgberidze I - - 1997
The Multicenter Automatic Defibrillator Implantation Trial (MADIT) showed improved survival with defibrillator therapy but was restricted to coronary artery disease patients with nonsustained ventricular tachycardia (NSVT) and inducible nonsupressible VT. The outcome of patients without inducible VT or inducible but suppressed VT still remains unclear. We performed risk stratification at ...
Grimm W - - 1997
BACKGROUND: Head-up tilt testing is widely used in the evaluation of patients with suspected neurally mediated syncope. Although it remains unclear which patients require medical therapy to prevent recurrent syncope, most centres initiate empiric medical therapy in all patients in whom neurally mediated syncope has been diagnosed. To determine the ...
Hanson M W - - 1997
BACKGROUND: Intravenous dobutamine is an acceptable pharmacologic stress agent for evaluation of myocardial ischemia, but it has the undesirable side effect of precipitating cardiac arrhythmias. All patients are susceptible to the arrhythmogenic potential of dobutamine. However, the presence of a baseline arrhythmia creates additional concern about proceeding with a pharmacologic ...
Flammang D - - 1997
BACKGROUND: Selection of treatment in vasovagal syndrome should be guided by the mechanism of symptoms. This study determined whether a simple drug test may assess one mechanism. METHODS AND RESULTS: To identify patients at risk of severe cardioinhibitory response of vagal origin, we infused 20 mg ATP into 316 patients ...
Kim S G - - 1997
In the Antiarrhythmics Vs Implantable Defibrillators (AVID) trial, all patients who meet the study entry criteria are followed in a registry. During the period between June 1993 and June 1995, of 1,117 patients who were enrolled in the registry and met the study entry criteria, 476 were randomized to receive ...
Momiyama Y - - 1997
Microvolt-level T-wave alternans (alternating morphology from beat to beat) during atrial pacing and exercise may predict ventricular tachycardia (VT) and fibrillation (VF) in ischemic heart disease. We tested whether such alternans during exercise could identify high-risk patients with hypertrophic cardiomyopathy (HCM). We studied 14 HCM patients and 9 normal control ...
Natale A - - 1997
The active can defibrillator has been designed for implantation in the left prepectoral region. Whether this system can be successfully implanted on the right side is unknown. We describe six cases in which placement of the unipolar single lead defibrillation system was successfully attempted in the right prepectoral region due ...
Geelen P - - 1997
AIM: Concern exists about the benefit of implantable defibrillator therapy in elderly patients. We assessed the utility of implantable defibrillator therapy and its effect on mortality in patients 70 years and older and compared results in this group to those in younger patients. METHODS AND RESULTS: Thirty-two out of 200 ...
Haverkamp W - - 1997
OBJECTIVE: The aim of this study was to assess the antiarrhythmic efficacy and safety of d,l-sotalol in patients with ventricular tachycardia (VT) or ventricular fibrillation (VF) and in survivors of cardiac arrest and to identify the factors that are associated with arrhythmia suppression and therefore might be helpful in predicting ...
Balaji S - - 1997
Prolonged QRS duration on the electrocardiogram has been found to predict adverse arrhythmic events in patients late after repair of tetralogy of Fallot. Whether QRS duration can also predict inducible ventricular tachycardia (VT) at electrophysiologic study is unknown. Between 1984 and 1995 we studied 135 survivors of tetralogy of Fallot ...
Grimm W - - 1997
Early or localized forms of arrhythmogenic right ventricular dysplasia (ARVD) have been proposed as the arrhythmogenic substrate of repetitive monomorphic ventricular tachycardia (RMVT) originating in the right ventricular outflow tract in patients without any underlying cardiac abnormality on clinical examination and echocardiography. To further examine this hypothesis, magnetic resonance imaging ...
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