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Kyriazis Konstantinos - - 2009
We report a case of an electrical storm occurring in a patient implanted with a cardioverter defibrillator for symptomatic Brugada syndrome. Recurrent ventricular fibrillation was initiated by short-coupled premature ventricular beats of right ventricular origin, associated with a fixed Brugada type 2 electrocardiographic pattern. Low-dose orciprenaline application as an intravenous ...
Vlay Stephen C - - 2009
A 75-year-old man with a Sprint Fidelis ICD lead (Medtronic Inc., Minneapolis, MN, USA) experienced inappropriate shocks after sudden failure of the right ventricular (RV) pace-sense connector resulting in noise. Interrogation of the implantable cardioverter-defibrillator pulse generator revealed that the 3 AM daily measurement of RV pacing impedance was slightly ...
Harve Heini - - 2009
INTRODUCTION: Sudden cardiac arrest is one of the leading causes of death, and early defibrillation of ventricular fibrillation (VF) is the single most important intervention for improving survival. The automated external defibrillator (AED) and the concept of public access defibrillation provide a solution to shorten defibrillation delays. Commercial aircraft create ...
Filion Kristian B - - 2009
OBJECTIVES: Implantable cardioverter defibrillators (ICDs) are an effective but expensive treatment for the prevention of sudden cardiac deaths in patients with severe left-ventricular dysfunction. Recent studies suggest that microvolt T-wave alternans (MTWA) predicts mortality and severe arrhythmic events in this population. However, the impact of MTWA on ICD cost-effectiveness is ...
Roes Stijntje D - - 2009
BACKGROUND: The relation between infarct tissue heterogeneity on contrast-enhanced MRI and the occurrence of spontaneous ventricular arrhythmia (or sudden cardiac death) is unknown. Therefore, the study purpose was to evaluate the predictive value of infarct tissue heterogeneity assessed with contrast-enhanced MRI on the occurrence of spontaneous ventricular arrhythmia with subsequent ...
Takagi Yusuke - - 2009
BACKGROUND: The pathogenesis of out-of-hospital cardiac arrest (OHCA) without organic heart disease has not been fully investigated. METHODS AND RESULTS: Induction tests were performed in 12 consecutive patients with OHCA for both coronary vasospasm with intracoronary acetylcholine and ventricular fibrillation (VF) with programmed stimulation at 1 month after the event. ...
Makanjee Bhavanesh - - 2009
Current recommendations for therapy of catecholaminergic ventricular tachycardia (CPVT) include beta blockade and implantable cardioverter defibrillators (ICDs). Patients may experience recurrent arrhythmias, ICD shocks and, rarely, sudden death despite optimal medical therapy. We report a young woman with CPVT who received frequent ICD shocks despite beta blockade, who subsequently underwent ...
Indik Julia H - - 2009
Some clinical studies have suggested that chest compressions before defibrillation improve survival in cardiac arrest because of prolonged ventricular fibrillation (VF; ie, within the circulatory phase). Animal data have also supported this conclusion, and we have previously demonstrated that preshock chest compressions increase the VF median frequency and improve the ...
Ogawa Masahiro - - 2009
Successful defibrillation may be followed by recurrent spontaneous ventricular fibrillation (VF). The mechanisms of postshock spontaneous VF are unclear. The purpose of this study was to determine the mechanisms of spontaneous VF after initial successful defibrillation in a rabbit model of heart failure (HF). Simultaneous optical mapping of intracellular calcium ...
Brouwer Ingeborg A - - 2009
AIMS: To determine the effects of omega-3 polyunsaturated fatty acids (omega-3 PUFAs) from fish on the incidence of recurrent ventricular arrhythmia in implantable cardioverter defibrillator (ICD) patients by combining results from published trials. METHODS AND RESULTS: We searched in the Medline, EMBASE, and Cochrane databases and performed a meta-analysis on ...
Freedman Roger A - - 2009
INTRODUCTION: Right ventricular (RV) anodal stimulation may occur in cardiac resynchronization therapy defibrillators (CRT-D) when left ventricular (LV) pacing is configured between the LV lead and an electrode on the RV defibrillator lead. RV defibrillator leads can have a dedicated proximal pacing ring electrode (dedicated bipolar) or utilize the distal ...
Rosenheck Shimon - - 2009
AIMS: Defibrillation is the only clinically effective treatment for ventricular fibrillation (VF). Early defibrillation improves the outcome and increases the chance of survival with full recovery. Immediate availability of a home-based defibrillator using mains-derived alternating current (AC) current will drastically improve the outcome. The aim was to develop a defibrillator ...
Kamousi B - - 2009
Inappropriate shocks due to misclassification of supraventricular and ventricular arrhythmias remain a major problem in the care of patients with Implantable Cardioverter Defibrillators (ICDs). The purpose of this study was to investigate the ability of a new covariance-based support vector machine classifier, to distinguish ventricular tachycardia from other rhythms such ...
Scher David L - - 2009
A 78-year-old woman with a remote history of chronic atrial fibrillation and catheter ablation of the atrioventricular node with a permanent ventricular pacemaker sustained a syncopal episode. Interrogation of her pacemaker revealed electrograms of ventricular fibrillation with a duration of 26 seconds. The patient underwent upgrade to an implantable cardioverter ...
Kurisu Satoshi - - 2009
A 56-year-old man under right ventricular pacing for atrial fibrillation and bradycardia had congestive heart failure. He received a cardiac resynchronization pacemaker with a defibrillator. Four months later, follow-up transthoracic echocardiography showed a right atrial mass although he had no symptom. Transesophageal echocardiography showed a large immobile round-shaped mass on ...
Demirbilek Fatma N - - 2009
A defibrillator sync output signal connector provides an ECG synchronization signal that can be used by some defibrillators for the purpose of performing synchronized cardioversion [1]. This process is used to stop an abnormally fast heart rate or cardiac arrhythmia by the delivery of a therapeutic dose of electric current ...
Gilman Byron L - - 2009
Introduction: Sudden cardiac death (SCD) takes up to 500,000 lives each year before a victim can even be treated. To address this the implantable cardioverter defibrillator (ICD) was developed to treat those identified at high risk of SCD. Unfortunately, there are a significant number of cases in which the ICD ...
Margos Panagiotis N - - 2009
Implantable Cardioverter Defibrillator (ICD) implantation is the only established therapy for primary or secondary prevention of sudden cardiac death in patients with Hypertrophic Cardiomyopathy (HCM). Ineffectiveness of shock therapy for the termination of potentially fatal ventricular arrhythmias in ICD recipients is rare in the presence of appropriate arrhythmia detection by ...
Stecher Frederik S - - 2008
INTRODUCTION: There is a need to measure cardiopulmonary resuscitation (CPR) in order to document whether ambulance personnel follow CPR guidelines. Our goal was to do this using defibrillator technology based on changes in transthoracic impedance (TTI) produced by chest compressions and ventilations. METHODS: 122 incidents of out-of-hospital cardiac arrest between ...
Lau Ernest W - - 2008
A 76-year-old man received a dual-chamber implantable cardioverter defibrillator (ICD), with the defibrillator lead positioned within the right ventricular outflow tract. The lead parameters at the time of implantation were satisfactory and the post-procedure chest X-ray showed the leads were in place. The patient was cardioverted from atrial fibrillation during ...
Goette Andreas - - 2009
Although the use of implantable cardioverter defibrillator (ICD) therapy has increased over the last decades, the reporting of ICD lead performance is inadequate. So far, there is neither a European nor worldwide registry on ICD leads. The published long-term results from national or multicentre registries encompass relatively small patient cohorts. ...
Tsai Min-Shan - - 2008
OBJECTIVES: When systemic hypothermia was maintained before inducing cardiac arrest, the likelihood of successful defibrillation and meaningful survival was increased. When hypothermia is induced during cardiopulmonary resuscitation, mortality is also improved. With the introduction of the amplitude spectrum area as a predictor of the success of electrical defibrillation, we investigated ...
Ristagno Giuseppe - - 2008
OBJECTIVES: Current automated external defibrillations require interruptions in chest compressions to avoid artifacts during electrocardiographic analyses and to minimize the risk of accidental delivery of an electric shock to the rescuer. The earlier three-shock algorithm, with prolonged interruptions of chest compressions, compromised outcomes and increased severity of postresuscitation myocardial dysfunction. ...
Huang David T - - 2008
Rapidly recurrent ventricular arrhythmia is not an infrequent clinical entity in the era of implantable cardioverter defibrillator therapy. Clinical presentation can vary dramatically, from multiple defibrillator shocks with hemodynamic instability, to asymptomatic delivery of anti-tachycardia pacing. Although some investigators have reported disparate prognostic implications with electrical storm, in larger trials ...
Yang Felix - - 2008
BACKGROUND: Although prophylactic implantable cardioverter-defibrillator (ICD) implantation is beneficial in patients with severe ischemic cardiomyopathy, it is unclear whether patients with cardiomyopathy due to valvular heart disease have a similar benefit. METHODS: We followed 17 patients (14 men/three women, age 62 +/- 13 years, left ventricular ejection fraction [LVEF] 29 ...
Gold Michael R - - 2008
Sudden cardiac death remains a leading cause of mortality despite advances in medical treatment for the prevention of ischemic heart disease and heart failure. Recent studies showed a benefit of implantable cardioverter defibrillator implantation, but appropriate shocks for ventricular tachyarrhythmias were noted only in a minority of patients during 4 ...
Sims Jared A - - 2009
During a defibrillation shock, epicardial conductors can introduce antistimulatory effects due to lowering of the voltage gradient in myocardial tissue under the conductor and stimulatory effects due to membrane polarization near edges. We hypothesized that increasing the area of conductors increases the defibrillation threshold (DFT), while increasing the amount of ...
Uyguanco Eric R - - 2008
The implantable cardioverter defibrillator (ICD) has become the primary therapy for the treatment of potentially lethal ventricular arrhythmias. Ventricular arrhythmias encompass a spectrum of rhythm disturbances ranging from the occasional monomorphic ventricular premature complex to the almost universally fatal ventricular fibrillation. Our understanding of the mechanisms of ventricular fibrillation and ...
Tung Roderick - - 2008
The indications for implantable cardioverter-defibrillators (ICDs) for the prevention of sudden cardiac death have rapidly expanded over the past 10 years. Clinical trial data have quickly been implemented into guidelines without critical reassessment of the strengths and limitations of the evidence. ICD therapy has inherent risks including infection, unnecessary shocks, ...
Chockalingam Priya - - 2009
Multiple cardiac rhabdomyomas in an infant presented with recurrent life-threatening ventricular arrhythmias refractory to medical treatment and necessitating the placement of an implantable cardioverter defibrillator (ICD). The device functioned effectively as a bridge to recovery during a 2-year follow-up period, when the tumor showed spontaneous regression, along with an almost ...
Osorio Jose - - 2008
During resuscitation, fibrillation often recurs. In swine, we studied refibrillation after long-duration ventricular fibrillation, investigating an association with chest compressions (CCs). In protocol A, 47 episodes of long-duration ventricular fibrillation lasting at least 2.5 minutes were induced in 8 animals. After defibrillation, CCs were required for 35 episodes and delivered ...
Naik Nitish - - 2008
Idiopathic Ventricular Fibrillation is a rare cause of sudden cardiac death. It may be difficult to prospectively diagnose idiopathic ventricular fibrillation due to the episodic nature of the arrhythmias as well as the inability to induce the clinical tachycardia on electrophysiological studies. Although an implantable cardioverter defibrillator can terminate episodes ...
Blatt Joseph A - - 2008
This study investigated whether defibrillation threshold (DFT) testing during implantable cardioverter-defibrillator (ICD) implantation predicts clinical outcomes. Defibrillation testing is often performed during insertion of ICDs to confirm shock efficacy. There are no prospective data to suggest that this procedure improves outcomes when modern ICDs are implanted for primary prevention of ...
Kowalski Marcin - - 2008
Implantable cardioverter-defibrillators (ICDs) improve survival in patients who have left ventricular dysfunction; however, they are associated with numerous problems at implant and during follow-up. The diagnosis and management of these problems is usually straightforward, but more difficult problems may include the management of patients who have elevated energy requirements to ...
Knops P - - 2008
One day after childbirth, a 29-year-old woman had several episodes of polymorphic ventricular tachycardia and ventricular fibrillation. She was rescued by an internal cardioverter defibrillator (ICD) which she had received 14 years ago, after out-of-hospital cardiac arrest, without recurrences until now. The electrocardiogram showed a normal QT interval, and ventricular ...
Bogaard K - - 2008
A 36-year-old man with a history of primary sclerosing cholangitis and epilepsy was admitted to our hospital for cholangitis. During admission he was resuscitated because of ventricular fibrillation. ECGs showed multiple ventricular premature beats (VPBs) with a short coupling interval (240 ms), resulting in frequent torsade de pointes (TdP). In ...
Okubo Katsuaki - - 2009
Isolated noncompaction of the ventricular myocardium (INVM) is an unclassified cardiomyopathy and is thought to be due to arrest of myocardial morphogenesis. Left ventricular failure and ventricular arrhythmias may occur in approximately half of the patients and account for half of the death in this disorder. In this report, we ...
Lynch Alison M - - 2008
BACKGROUND: Electroconvulsive therapy (ECT) can be life-saving in treating depression, even for high-risk cardiac patients. A 56-year-old man with type 2 diabetes and dilated cardiomyopathy, using both a defibrillator and an experimental cardiac contractility modulator, had had episodes of severe depression superimposed on dysthymia for 27 years, with a current ...
Indik Julia H - - 2008
In cardiac arrest resulting from ventricular fibrillation, the ventricular fibrillation waveform may be a clue to its duration and predict the likelihood of shock success. However, ventricular fibrillation occurs in different myocardial substrates such as ischemia, heart failure, and structurally normal hearts. We hypothesized that ventricular fibrillation is altered by ...
Finamore Sheila - - 2008
Cardiac arrest, as a result of ventricular fibrillation or pulseless ventricular tachycardia, is a common phenomenon, and the only treatment available is defibrillation. Currently, defibrillators deliver either a monophasic or biphasic shock, depending on the device used. In 2005, the American Heart Association published new cardiac arrest management guidelines, which ...
Yamada Takumi - - 2009
A 79-year-old woman without structural heart disease underwent catheter ablation of ventricular tachycardia. Successful ablation was achieved on the left ventricular epicardium using an epicardial approach via pericardial puncture. Thereafter, programmed stimulation induced ventricular fibrillation (VF). A 360 J biphasic extrathoracic cardioversion using cutaneous pads in the conventional sternal-apical position ...
Tormos Alvaro - - 2008
As a result of their modulating effects upon myocardial electrophysiology, both hypo- and hyperthermia can be used to study the mechanisms that generate or sustain cardiac arrhythmias. The present study describes an original electrode developed with thick-film technology and capable of controlling regional temperature variations in the epicardium while simultaneously ...
Karabsheh Shadi - - 2008
This is the second case report in literature that describes the simultaneous acoustic cardiographic, electrocardiographic, and invasive hemodynamic events that occurred before, during and after ventricular fibrillation that was successfully cardioverted to sinus rhythm. The absence of heart sounds, which are linked to the lack of effective myocardial contractility, correlated ...
Strohmenger Hans-Ulrich - - 2008
PURPOSE OF REVIEW: Ventricular fibrillation is the primary rhythm in many cardiac arrest patients. Since the late 1980s, the surface electrocardiogram of ventricular fibrillation has been subjected to analysis to obtain reliable information about the likelihood of successful countershock and to estimate the duration of cardiac arrest. Considerable efforts were ...
Armstrong Paidrig - - 2008
Introduction: Patients at risk of sudden cardiac death secondary to poor ventricular function are frequently managed with implantable cardioverter defibrillators (ICD). (1) Clinicians performing peripheral nerve blocks (PNB) frequently use peripheral nerve stimulators(PNS) to assist with nerve localization.(2)The case of an individual with an ICD presenting for upper limb surgery ...
Mollerus Michael - - 2008
OBJECTIVE: To determine whether the placement of an implantable cardioverter-defibrillator (ICD) lead in the right ventricular outflow tract (RVOT) has the same defibrillation threshold (DFT) as the right ventricular apex (RVA). BACKGROUND: Right ventricular ICD leads have usually been placed in the RVA. Development of active fixation technology has allowed ...
Kumar Kapil - - 2008
INTRODUCTION: Extensive in vitro studies and clinical evidence (MERLIN trial) indicate an antiarrhythmic potential of ranolazine, a novel antianginal agent. Programmed electrophysiologic testing was performed to quantify ranolazine's effects on ventricular vulnerability and defibrillation thresholds and to gain insights into mechanisms. METHODS AND RESULTS: Effects of ranolazine (9.2 +/- 2.1 ...
Lopez J Alberto - - 2008
A 57-year-old patient with a tricuspid valve (TV) prosthesis underwent successful atrioventricular pacing and internal defibrillation via a totally transvenous approach without crossing the TV. Ventricular pacing and sensing were obtained with a bipolar lead in the lateral cardiac vein. Internal defibrillation was obtained with a coil lead in the ...
Nair Krishnakumar - - 2008
Ventricular fibrillation usually is sustained and unrelenting in human subjects and rarely is self-terminating after 30 seconds' duration. Temporal evolution of the arrhythmia in our patient suggested that organization of electrical activity varies over time. Interaction of organization with high catecholamine levels and hyperkalemia may play a role in self-termination ...
Kostis William J - - 2008
Ventricular arrhythmias occur frequently in patients with arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C) as well as those with ischemic heart disease. We present the case of a 29-year-old man with ARVD/C and multiple episodes of symptomatic ventricular tachycardia terminated by implantable cardioverter defibrillator (ICD) discharges. Phasic elevation of troponin-I prompted repeated ...
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