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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 ...
Molon Giulio - - 2004
This report describes a patient with a previous myocardial infarction who presented with syncope. The patient had a positive microvolt T wave alternans test, a negative electrophysiological study, and a normal heart rate variability. In hospital, the patient had episodes of ventricular tachycardia and fibrillation. An implantable cardioverter defibrillator was ...
Wietholt Dietmar - - 2003
BACKGROUND: In patients with implantable cardioverter-defibrillators (ICDs), 25 to 45% of tachyarrhythmia episodes were initiated by short-long-short RR intervals. METHODS: The prospective multi-center PREVENT study randomized patients implanted with ICDs capable of atrioventricular pacing, in order to compare-using a cross-over design with two 3-month treatment periods-the benefits of 'rate smoothing' ...
Jaoudé Simon Abou - - 2003
Implantable cardioverter-defibrillator (ICD) is highly effective in treating life-threatening ventricular arrhythmias, but it can also have proarrhythmic effect in some cases. We report the case of a 72 years old patient with an ischemic cardiomyopathy in whom an ICD was implanted for a poorly tolerated ventricular tachycardia (Profiles MD-Ventritex). Forty-eight ...
Grönefeld Gerian - - 2003
The implantable defibrillator (ICD) effectively palliates arrhythmogenic events and thereby reduces total mortality in patients after a first episode of cardiac arrest. At present, four randomized controlled trials have addressed the issue of primary prevention by the ICD in patients with coronary artery disease and two small studies are available ...
Corrado Domenico - - 2003
BACKGROUND: Arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) is a condition associated with the risk of sudden death (SD). METHODS AND RESULTS: We conducted a multicenter study of the impact of the implantable cardioverter-defibrillator (ICD) for prevention of SD in 132 patients (93 males and 39 females, age 40+/-15 years) with ARVC/D. ...
Cuesta Alejandro - - 2003
This study analyzes the effectiveness of the implantable cardioverter defibrillator in a group of 40 consecutive patients with idiopathic dilated cardiomyopathy and sustained ventricular arrhythmia; these patients were compared with a control group of 80 consecutive patients with proved coronary artery disease. There were no differences in the type and ...
Carpenter John - - 2003
BACKGROUND: The importance of the defibrillation waveform on the evolving post-shock cardiac rhythm is uncertain. The primary objective of this study was to evaluate cardiac rhythms following the first defibrillation shock, comparing biphasic truncated exponential (BTE), monophasic damped sinusoidal (MDS), and monophasic truncated exponential (MTE) waveforms in patients experiencing out-of-hospital ...
Schron Eleanor B - - 2003
Although major advances have been made in the prevention, diagnosis, and treatment of cardiovascular diseases, the prevalence of these diseases in the US population is almost 62 million, with almost 8 million having had a myocardial infarction and nearly 5 million with a diagnosis of heart failure. Increasingly implantable devices ...
Basta Lofty L - - 2003
The Multicenter Automatic Defibrillator Implantation Trial (MADIT II) investigators assert that their results justify the placement of artificial implantable defibrillator cardioverter devices in patients aged 75 years and older with prior myocardial infarction and left ventricular dysfunction (ejection fraction of 30 or less). The authors claim that the results of ...
Rashba Eric J - - 2003
Distal RV Coil Position Reduces DFTs. INTRODUCTION: Understanding the factors that affect defibrillation thresholds (DFTs) has important implications both for optimization of defibrillation efficacy and for the design of new transvenous leads. The aim of this prospective study was to test the hypothesis that defibrillation efficacy is improved with the ...
Berg Robert A - - 2003
STUDY OBJECTIVE: We sought to determine whether the delays in chest compressions and defibrillation associated with an automated external defibrillator would adversely affect outcome compared with manual defibrillation in a swine model of out-of-hospital prolonged ventricular fibrillation. METHODS: After 8 minutes of untreated ventricular fibrillation, 16 swine (33+/-4 kg) were ...
Lüderitz Berndt - - 2003
The history of interventional electrophysiology is long and fascinating. In the beginning, there is not simply the anatomy and physiology of the heart, but also analysis of the pulse, which indicates the activity of the heart. The analysis of the (peripheral) pulse as a mechanical expression of heart activity goes ...
Rao B Hygriv - - 2003
PURPOSE OF REVIEW: Present generation implantable cardioverter-defibrillators (ICD) have become a proven primary therapeutic option in management of symptomatic ventricular arrhythmias and are now being increasingly used for primary prevention. The addition of biventricular pacing and atrial defibrillation to these devices has had an impact on the management of several ...
van Alem Anouk P - - 2003
STUDY OBJECTIVE: The protocol for the use of the automated external defibrillator calls for a period of "hands-off" time, during which no cardiopulmonary resuscitation (CPR) can be performed. We assessed the actual interruption time of CPR during the use of the automated external defibrillator in patients in out-of-hospital cardiac arrest. ...
Hahn Stephen J. - - 2003
Implantable cardioverter-defibrillators (ICDs) are unequivocally the treatment of choice for patients who have already experienced a near-fatal tachyarrhythmic event. Recently, studies have conclusively demonstrated that extending the benefits of ICD therapy to postinfarction patients with resultant left ventricular dysfunction results in dramatic additional lifesaving without the need for complex risk- ...
Pepe Paul E - - 2004
Despite well developed emergency medical services with rapid response advanced life support capabilities, survival rates following out-of-hospital ventricular fibrillation (VF) have remained bleak in many venues. Generally, these poor resuscitation rates are attributed to delays in the performance of basic cardiopulmonary resuscitation by bystanders or delays in defibrillation, but recent ...
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