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de Jong Jonas S S G - - 2009
BACKGROUND: Sudden cardiac death (SCD) constitutes one of the most prevalent modes of death and is mainly caused by primary ventricular fibrillation (VF), that is, VF in the acute setting of a first acute myocardial infarction (MI). Current guidelines for secondary prevention of SCD are based on data from the ...
T?rko?lu Cengizhan - - 2009
Monitoring intrathoracic impedance has become an integral part of follow-up of patients with implantable cardioverter defibrillator (ICD) or cardiac resynchronization therapy/defibrillator due to heart failure. However, several noncardiac factors may influence intrathoracic impedance. We report on an unusual cause of decrease in intrathoracic impedance in a 54-year-old male patient following ...
Tereshchenko Larisa G LG Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Baltimore, Maryland 21287, USA. - - 2009
This study aimed to identify an early marker of functional impairment after an implantable cardioverter-defibrillator (ICD) shock as a predictor of heart failure progression. The ICD population has substantial risk of death due to progressive pump failure. Near-field (NF) bipolar right ventricular (RV) electrograms (EGMs) during induced ventricular fibrillation (VF) ...
Mehra Mandeep R - - 2009
Clinical guidelines recommend implantable cardioverter-defibrillators (ICDs) for selected patients with chronic left ventricular dysfunction (LVD) to improve survival, yet ICD treatment rates for eligible patients with LVD or heart failure (HF) in cardiology practices remain poorly studied. This study sought to determine patient and practice characteristics associated with ICD use ...
Van Casteren Lieve - - 2009
Sensing in pacemakers (PMs) and implantable cardioverter defibrillators (ICDs) is crucial to normal device behaviour. Since both devices treat different arrhythmias, the technical approach to signal detection is also completely different. A PM has a fixed threshold of sensing, above which events are sensed and therapy of the device withheld. ...
Coppola Giuseppe - - 2009
Isolated noncompaction of the ventricular myocardium (INVM) is an uncommon cardiomyopathy characterized by the persistence of fetal myocardium with prominent trabecular meshwork and deep intertrabecular recesses, often associated with systolic dysfunction and ventricular dilatation. A 23-year-old man from Burkina Faso was referred to our operative unit with a diagnosis of ...
Dhoble Abhijeet - - 2009
BACKGROUND: Preventing ventricular arrhythmias in patients with cardiac amyloidosis is challenging since the amyloid protein deposition in the myocardium may interfere with the normal cardiac electric excitation. Most of these patients succumb to either progressive congestive heart failure, or sudden cardiac death (SCD). Implantable cardioverter defibrillator (ICD) offers a near ...
Schuller Joseph L - - 2011
In this case report, we describe markedly fluctuating ventricular sensing through an implantable cardioverter defibrillator (ICD) over a period of 29 months in a patient with cardiac sarcoidosis. We conclude that the fluctuations in the measured R wave are the result of waxing and waning inflammation associated with sarcoid activity. The ...
Li Yongqin - - 2009
AIM OF STUDY: The waveform designs and their relative defibrillation efficacy of external biphasic waveforms may differ remarkably among manufacturers. In this study, we compared pulsed biphasic waveform (PBW) with rectilinear biphasic waveform (RBW) and their effects on terminating ventricular fibrillation (VF). METHODS: VF was electrically induced and untreated for ...
Zaman Sarah - - 2009
BACKGROUND: Methods to identify high-risk patients and timing of implantable cardioverter-defibrillator (ICD) therapy after ST-elevation myocardial infarction need further optimization. METHODS AND RESULTS: We evaluated outcomes of early ICD implantation in patients with inducible ventricular tachycardia. Consecutive patients treated with primary percutaneous coronary intervention for acute ST-elevation myocardial infarction underwent ...
Awan Zahid Aslam - - 2009
BACKGROUND: Prevention of sudden cardiac death has always been a challenge for electrophysiologists and to date, automatic implantable cardiovertor defibrillator (AICD) is found to be the only remedy. This device delivers an intracardiac shock whenever it senses a fatal ventricular arrhythmia in order to achieve sinus rhythm. If the delivery ...
Giudici Michael C - - 2010
Venous access for pectoral pacemaker and defibrillator lead placement can be compromised by venous occlusion due to previous pacing leads, access ports for medications such as chemotherapy, dialysis access, and other causes. On rare occasion, a femoral access is utilized for device placement. We report here a patient without venous ...
Nolan Jerry P - - 2009
PURPOSE OF REVIEW: To discuss recent data that may influence defibrillation in clinical practice and improve outcome after cardiac arrest from a shockable rhythm. RECENT FINDINGS: Reducing the preshock pause (interval between stopping chest compressions and shock delivery) improves shock success. The preshock pause can be reduced by continuing chest ...
Stockburger Martin - - 2009
AIMS: Data from previous defibrillator studies raised concern about right ventricular pacing (RVP) promoting heart failure progression and mortality in implantable cardioverter/defibrillator (ICD) patients. The present observational study re-examined the association of RVP, survival, and ventricular tachyarrhythmias/ventricular fibrillation (VT/VF) in routine ICD patients with restrictively programmed pacing. METHODS AND RESULTS: ...
Chaki Amber L - - 2009
The number of heart failure patients with implantable cardioverter-defibrillators is rising. Common issues encountered in this population are high defibrillation thresholds and inappropriate shocks. In order to resolve these problems, the addition of a class III antiarrhythmic such as sotalol is often considered. Given the emerging issue of polypharmacy and ...
Sucu Murat - - 2009
External electrical cardioversion was first performed in the 1950s. Urgent or elective cardioversions have specific advantages, such as termination of atrial and ventricular tachycardia and recovery of sinus rhythm. Electrical cardioversion is life-saving when applied in urgent circumstances. The succcess rate is increased by accurate tachycardia diagnosis, careful patient selection, ...
Hamid Shoaib - - 2009
Placement of leads into the coronary sinus (CS) is now routinely used for cardiac resynchronization therapy. However, the CS can also be used for the placement of defibrillator shock leads. There is evidence demonstrating that CS leads in situ for the short and medium term can be successfully removed utilizing ...
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. ...
Feitosa-Filho Gilson Soares GS Clínica Médica e de Cardiologia, Hospital Santa Izabel, Santa Casa de Misericórdia da Bahia, Salvador, BA, - - 2009
Cardiac arrest survivors frequently suffer from ischemic brain injury associated with poor neurological outcome and death. Therapeutic hypothermia improves outcomes in comatose survivors after resuscitation from out-of-hospital cardiac arrest. Considering its formal recommendation as a therapy, post-return of spontaneous circulation after cardiac arrest, the objective of this study was to ...
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 JH Sarver Heart Center, Department of Medicine, University of Arizona College of Medicine, Tucson, Arizona 85724-5037, USA. - - 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 M Division of Cardiology, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, - - 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 ...
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 ...
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 ...
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
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 does ...
Kamousi B B School of Medicine, Stanford University, Stanford, CA, - - 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 ...
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 MR Division of Cardiology, Medical University of South Carolina, Charleston, SC 29425-5920, USA. - - 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 JA Department of Biomedical Engineering, School of Medicine, University of North Carolina, Chapel Hill, NC 27599, USA. - - 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 J Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35291-0007, USA. - - 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 ...
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