Search Results
Results 451 - 500 of 1134
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Plummer Christopher J - - 2005
AIMS: Implantable cardioverter defibrillators (ICDs) have been shown to reduce all-cause mortality in groups of patients at high risk of ventricular arrhythmias. The true incidence of ICD indications is unknown but we hypothesize that it far exceeds the number actually implanted. METHODS: In a one month observational audit, we reviewed ...
Ashwath Mahi Lakshmi - - 2005
OBJECTIVES: The Multicenter Automatic Defibrillator Implantation Trial II in 2002 recommended implantable cardioverter defibrillators (ICDs) prophylactically for all patients with a prior myocardial infarction and ejection fraction (EF) of 30% or less. In June of 2003, the Centers for Medicare and Medicaid Services approved reimbursement for ICD placement in patients ...
Brennan Timothy D - - 2005
Sudden cardiac death (SCD) manifested as ventricular fibrillation or sustained ventricular tachycardia has been a major focus of cardiovascular research for more than three decades. Although mortality in patients with heart failure (HF) caused by left ventricular systolic dysfunction has declined in recent years through effective pharmacotherapeutic strategies, SCD remains ...
Grönefeld Gerian - - 2005
25 years after the first coronary artery patient received an implantable cardioverter defibrillator (ICD), many randomized controlled trials on prophylactic ICD therapy have been conducted. Taken together, these trials allow an evidence-based approach to primary prevention of sudden cardiac death in patients after a myocardial infarction. Patients with chronic ischemic ...
Anastasiou-Nana Maria I - - 2005
BACKGROUND: Acute myocardial ischemia and the mode of ventricular fibrillation (VF) induction influence the ventricular defibrillation threshold (DFT). OBJECTIVES: The purpose of this study was to determine the effects of transient regional left ventricular (LV) ischemia on the DFT. METHODS: Ventricular effective refractory period (ERP), ventricular fibrillation threshold (VFT), and ...
Walsh Simon J - - 2005
The modern generation of transthoracic defibrillators now employ impedance compensated biphasic waveforms. These new devices are superior to those with monophasic waveforms and practice is currently switching to biphasic defibrillators for the treatment of both ventricular and atrial fibrillation. However, there is no universal guideline for the use of biphasic ...
Tanno Kaoru - - 2005
BACKGROUND: The Multicenter Automatic Defibrillator Implantation Trial (MADIT) II investigators concluded that prophylactic use of an implantable cardioverter defibrillator (ICD) improved survival in patients with prior myocardial infarction (MI) and reduced the left ventricular ejection fraction (LVEF). However, it is unclear whether MADIT II criteria for ICD implantation are appropriate ...
Riahi Sam - - 2005
The aim of this study was to evaluate whether the incidence of ventricular arrhythmias and heart rate variability were influenced by statin treatment and lipid levels in patients treated with an implantable cardioverter defibrillator (ICD). Heart rate variability measurements were performed in 86 patients with coronary heart disease and an ...
Thong Tran T Department of Biomedical Engineering, Oregon Health & Science University, Beaverton, OR - - 2005
Using R-R interval history from 24-hour Holter recorders along with R-R interval history from implantable cardioverter defibrillators (ICD), a particular monotonic heart rhythm acceleration pattern during sinus rhythm, when used as a predictor of an imminent episode of ventricular tachyarrhythmia, can achieve a sensitivity of 44% with corresponding specificity of ...
Stevenson William G - - 2004
All physicians increasingly will encounter patients who have implanted cardioverter-defibrillators (ICDs) for protection from ventricular arrhythmias. This advisory provides a concise summary relevant to the assessment and management of patients with ICDs, including those who present to primary care or emergency department physicians with symptoms suggesting arrhythmia or ICD malfunction ...
Hohnloser Stefan H - - 2004
BACKGROUND: Implantable cardioverter-defibrillator (ICD) therapy has been shown to improve survival in patients with various heart conditions who are at high risk for ventricular arrhythmias. Whether benefit occurs in patients early after myocardial infarction is unknown. METHODS: We conducted the Defibrillator in Acute Myocardial Infarction Trial, a randomized, open-label comparison ...
Gunderson Bruce D - - 2004
OBJECTIVES: The goal of this analysis was to test an algorithm that identifies implantable cardioverter-defibrillator (ICD) lead problems before clinical failure and/or inappropriate therapy. BACKGROUND: The ICD lead failures typically present as inappropriate shock therapy. Identifying lead failures before their clinical presentation may prevent patient discomfort, improve device longevity, and ...
Kaup H J - - 2004
To prevent sudden cardiac death of patients who are at risk from long standing tachyarrhythmia the implantable cardioverter defibrillator (ICD) is the first choice therapy. ICDs use a range of electrostimuli up to defibrillation, which is a non synchronous high energy shock, whereas cardioversion is synchronous with the ECG. In ...
Müller S - - 2004
Commercially available cardiac pacemakers and implantable cardioverters/defibrillators (ICD) predominantly use the intracardiac derived electrocardiogram (ECG) for detection of arrhythmias. To achieve an automatic control of the heart frequency in accordance with cardiovascular strain and an improved detection of life-threatening arrhythmias, it is desirable to monitor the heart by an input ...
Chattipakorn Siriporn - - 2004
Sudden cardiac death is a major health problem in most industrialized countries around the world including Thailand. It is mainly caused by ventricular fibrillation (VF). Currently, defibrillation is the only effective clinical treatment of this fatal arrhythmia. Although defibrillation mechanism has been investigated extensively for many decades, its definite mechanism ...
Zareba Wojciech - - 2004
PURPOSE OF REVIEW: In the past few years, new clinical trials were conducted to determine the effectiveness of implantable cardioverter defibrillators (ICDs) for prevention of mortality in patients with ischemic and nonischemic cardiomyopathies. This paper aims to provide an overview of the current state of knowledge regarding ICD therapy in ...
Zangwill Steven D - - 2004
Commotio cordis is ventricular fibrillation that results from blunt chest trauma and is a life threatening condition; early resuscitation and defibrillation are critical. This may occur during sporting events or from child abuse and most patients are boys who are younger than 16 years. Commotio cordis' prognosis depends on the ...
Jekova Irena - - 2004
The automatic external defibrillator (AED) is a lifesaving device, which processes and analyses the electrocardiogram (ECG) and delivers a defibrillation shock to terminate ventricular fibrillation or tachycardia above 180 bpm. The built-in algorithm for ECG analysis has to discriminate between shockable and non-shockable rhythms and its accuracy, represented by sensitivity ...
Young Clayton - - 2004
OBJECTIVE: The objective of our study was to examine the effectiveness of an electrocardiographic predictor, amplitude spectral area (AMSA), for the optimal timing of defibrillation shocks in human victims of cardiac arrest. Based on the spectral characteristics of ventricular fibrillation potentials, we examined the probability of successful conversion to an ...
Munhoz Da Fontoura Tavares Claudio - - 2004
The case of a patient with recurrent ventricular fibrillation secondary to an aortic tumor is reported. Ventricular fibrillation occurs secondary to ischemia, arrhythmia, or congenital disease, or it may be an idiopathic event. Irreversible and recurrent situations require placement of an implantable cardioverter defibrillator (ICD). A patient with recurrent syncope ...
Lin David - - 2004
Automatic Sensitivity Control, unique to St. Jude defibrillators, allows for programmable sensitivity threshold and refractory periods. However, inappropriate programming can lead to marked undersensing and potentially lethal complications. We report a case of complete failure to sense ventricular fibrillation with inappropriate sensitivity adjustments. Detailed review of the parameters with induction ...
Paperini Luca - - 2004
A dual-coil defibrillation lead was inserted in a 64-year-old male through a persistent left superior vena cava draining into the coronary sinus. The lead, connected to a cardioverter-defibrillator (ICD) implanted in the left pectoral area, was looped in the right atrium positioning the proximal and distal lead coils in the ...
Paisey John R - - 2004
In porcine studies anodes in the middle cardiac vein compare favorably with those in the RV. It has not been demonstrated whether the RV and middle cardiac vein or the middle cardiac vein alone anodes are superior when shocking to a conventional SVC and active housing cathode nor whether a ...
Betts Timothy R - - 2004
A 32-year-old man with idiopathic ventricular fibrillation and an implantable cardioverter defibrillator presented during a ventricular fibrillation storm. Frequent monomorphic ventricular ectopics with left bundle branch block morphology were documented, some of which initiated fibrillation. He underwent noncontact mapping of the right ventricle, during which the ventricular ectopics were mapped ...
Bolad Islam - - 2004
The effectiveness of implantable cardioverter defibrillators (ICDs) implanted in the early postoperative period after cardiac surgery for ventricular tachyarrhythmias is unknown, because all of the major trials excluded this patient population. Thus, a 10-year retrospective study was conducted of patients who had ICDs implanted for de novo postoperative ventricular tachyarrhythmias ...
Sueblinvong Vithida - - 2004
A 21-year-old patient with repaired double-outlet right ventricle and normal ventricular function underwent internal cardioverter defibrillator implantation for primary prevention of sudden death. First occurrence of spontaneous ventricular tachycardia resulted in hemodynamic collapse and syncope but the internal cardioverter defibrillator rescued the patient. ICD implantation for primary prevention may be ...
Bokhari Fayez - - 2004
BACKGROUND: The implantable cardioverter defibrillator (ICD) is superior to amiodarone for secondary prophylaxis of sudden cardiac death. However, the magnitude of this benefit over long-term follow-up is not known. Thus, our objective was to evaluate the long-term consequences of using amiodarone versus an ICD as first-line monotherapy in patients with ...
Rashba Eric J - - 2004
INTRODUCTION: Atrial defibrillation can be achieved with standard implantable cardioverter defibrillator (ICD) leads, but the optimal shocking configuration is unknown. The objective of this prospective study was to compare atrial defibrillation thresholds (DFTs) with three shocking configurations that are available with standard ICD leads. METHODS AND RESULTS: This study was ...
Dosdall Derek J - - 2004
INTRODUCTION: The aim of this study was to demonstrate that significant reductions in defibrillation threshold (DFT) can be achieved by rapidly switching defibrillation pulses within an overall biphasic envelope between multiple endovascular electrode sets. METHODS AND RESULTS: Defibrillation electrodes were implanted in four locations in nine anesthetized swine (41.7 +/- ...
Eftestøl Trygve - - 2004
BACKGROUND: Early defibrillation is considered the most important factor for restoring spontaneous circulation in cardiac arrest patients with ventricular fibrillation. Recent studies have shown that, after prolonged ventricular fibrillation, the rates of return of spontaneous circulation (ROSC) and survival are improved if defibrillation is delayed so that CPR can be ...
Rich Kira E - - 2004
We investigated the relationship between air pollution and incidence of cardiac arrhythmia in a study of patients with implantable cardioverter defibrillators (ICDs). Thirty-four patients (ages 15-85 yr, 80% male) with ICDs residing in the Vancouver, Canada, area were included in the analyses, representing all patients attending the 2 ICD clinics ...
White Roger D - - 2004
PURPOSE OF REVIEW: The advent of biphasic waveforms for external defibrillation has generated extensive experimental and clinical investigation. At the same time, it has led to the development and clinical use of biphasic waveforms of several different designs. Finally, other types of waveforms, primarily triphasic, have entered experimental evaluation. RECENT ...
Killingsworth Cheryl R - - 2004
BACKGROUND: High catecholamine concentrations are cytotoxic to cardiac myocytes. We hypothesized that myocardial interstitial catecholamine levels are greatly elevated immediately after long-duration ventricular fibrillation (VF), defibrillation, and reperfusion and that the short-acting beta-antagonist esmolol administered at reperfusion would protect against this catecholamine surge and improve survival. METHODS AND RESULTS: In ...
John Joseph - - 2004
The use of implantable cardioverter defibrillator (ICD) in the management of malignant ventricular arrhythmia is well established. Radiation treatment is common in malignant neoplasms, but the direct effect of irradiation in ICD is largely not well understood. We describe a case where radiation treatment probably led to shock coil failure.
Schlimp C J - - 2004
BACKGROUND: Automated external defibrillators (AEDs) must combine easy operability and high-quality diagnosis even under unfavorable conditions. This study determined the influence of electromagnetic interference caused by high-voltage power lines with 16.7-Hz alternating current on the quality of AEDs' rhythm analysis. METHODS: Two AEDs frequently used in Austria were tested near ...
Bunch T Jared TJ Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic College of Medicine, Rochester, Minn 55905, - - 2004
To describe and evaluate the in-hospital treatment of ventricular arrhythmias and underlying structural heart disease in patients who survive ventricular fibrillation (VF) out-of-hospital cardiac arrest (OHCA) in a region with a high survival rate after hospital discharge. The study included all patients presenting in Olmsted County, Minnesota, who had experienced ...
Wever Eric F D - - 2004
Sudden unexpected cardiac death generally occurs in persons with known or previously unrecognized heart disease. However, it has become evident that it occurs often enough in patients without any identifiable structural abnormality to warrant the cardiologist's attention. Mostly, it concerns young, active, and otherwise healthy individuals. This paper focuses on ...
Tang Wanchun - - 2004
OBJECTIVES: This study examined the effects of biphasic truncated exponential waveform design on survival and post-resuscitation myocardial function after prolonged ventricular fibrillation (VF). BACKGROUND: Biphasic waveforms are more effective than monophasic waveforms for successful defibrillation, but optimization of energy and current levels to minimize post-resuscitation myocardial dysfunction has been largely ...
Manoharan Ganesh - - 2004
BACKGROUND: The passive implantable atrial defibrillator (PIAD) (with no battery or discharging capacitor and powered transcutaneously by radio-frequency energy) delivering a novel monophasic low-tilt waveform is more efficacious than the standard monophasic waveform at atrial defibrillation. Standard biphasic (STB) waveforms, however, are more efficacious and safer than monophasic waveforms. This ...
Kumar V, Adhikari KM, ...
Ventricular tachyarrhythmias - Ventricular fibrillation (VF) and Ventricular tachycardia (VT) account for most of out-of-hospital sudden cardiac arrests. Defibrillation is the specific therapy for VF/pulseless VT. Time to defibrillation is the most important determinant of survival from these cardiac arrests. Automated external defibrillator (AED) has largely replaced the conventional defibrillator ...
Rüb Norman - - 2004
Transvenous unipolar active can defibrillation systems have proven to be effective in treating ventricular tachyarrhythmias. However, a further reduction of ventricular defibrillation thresholds (V-DFT) would increase the longevity, reduce the size of pulse generators, and help to avoid additional leads in patients with inacceptable high V-DFTs. In a finite difference ...
Zhang H - - 2004
The applicability of the 'upper limit of vulnerability' defibrillation theory was evaluated in models of cardiac tissue in which spatial changes within cells are retained. Defibrillation thresholds were computed from two models of cardiac tissue: one with, and one without, a supernormal period, and compared with those predicted by the ...
Maury P - - 2004
A case of an electrical storm occurring in a patient implanted with a cardioverter-defibrillator for Brugada syndrome is reported. Recurrent ventricular fibrillation was initiated by short-coupled isolated monomorphic ventricular premature beats probably originating from the right ventricular outflow tract, associated with a manifest electrocardiographic pattern of Brugada syndrome. Infusion of ...
Weinberg Guy - - 2004
Previously we observed that during bupivacaine-induced circulatory collapse, myocardial tissue pH declined more slowly than expected. Here we evaluated the effect of bupivacaine on myocardial acidosis induced by ventricular fibrillation. Sixteen dogs were anesthetized with 1.5% end-tidal isoflurane, the chest was opened, and a probe that measured oxygen pressure (PmO(2)), ...
Gorenek B - - 2004
BACKGROUND: Cardiac troponin levels do not rise to marked levels after external cardioversion of atrial fibrillation. Subsequent test discharges during implantation of cardioverter defibrillators may cause an elevation of cardiac troponin levels, but are still controversial. OBJECTIVE: To determine whether the biomarkers of cardiac injury increase after internal cardioversion (IC) ...
Alexander Mark E - - 2004
INTRODUCTION: The incidence of appropriate and inappropriate discharges, indicators of system failure, and clinical implications of implantable cardioverter defibrillator (ICD) therapy in children and young adults with heart disease is poorly defined. METHODS AND RESULTS: In a retrospective study at a single medical center, a total of 90 ICD procedures ...
Celiker Alpay - - 2004
Isolated noncompaction of the ventricular myocardium is a rare unclassified cardiomyopathy and is thought to be due to arrest of myocardial morphogenesis. In fetal life, it is characterized by an excessively prominent trabecular meshwork and deep intratrabecular recesses, and occurs in the left ventricle in the absence of structural heart ...
Oseroff Oscar - - 2004
PURPOSE OF REVIEW: Controlled trials for secondary prevention of sudden death--Antiarrhythmics Versus Implantable Defibrillators (AVID), Canadian Implantable Defibrillator Study (CIDS), and Cardiac Arrest Study Hamburg (CASH)--have been published and subanalyses of them provide useful clinical information on the outcome during the follow-up of this population. RECENT FINDINGS: Results from a ...
McCullough Peter A - - 2004
The association between chronic kidney disease and cardiovascular death is accounted for, in part, by higher rates of serious arrhythmias. Research shows an independent relationship between worsened renal function and atrial fibrillation, heart block, ventricular tachycardia, ventricular fibrillation, and asystole. These higher rates also associate with underlying structural heart disease ...
Epstein Andrew E - - 2004
PURPOSE OF REVIEW: This review describes changes in indications for implantable cardioverter-defibrillator (ICD) implantation made in the American College of Cardiology, American Heart Association, and North American Society of Pacing and Electrophysiology 2002 update of the 1998 guideline for the implantation of cardiac pacemakers and antiarrhythmia devices. RECENT FINDINGS: Recent ...
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