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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 ...
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 ...
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 ...
Indik Julia H JH Sarver Heart Center at The University of Arizona College of Medicine, Tucson, AZ, USA. - - 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 ...
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 ...
Pereira João Carlos Ramos Gonçalves - - 2008
Out-of-hospital cardiac arrest is a major cause of death with survival rates as low as 5% to 35%. A large number of patients who survive resuscitation will face significant neurological damage, as a result of the ischemia that occurs both during cardiac arrest and reperfusion. However understanding of the mechanisms ...
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 ...
Koller Michael T - - 2008
BACKGROUND: Implantable cardioverter-defibrillators (ICDs) improve survival in selected patients with left ventricular systolic dysfunction in randomized trials. Competing death without prior appropriate ICD therapy might preclude benefit from ICD implantation in a less selected routine-care population. METHODS AND RESULTS: We selected all patients with ischemic or dilated cardiomyopathy with an ...
Lakkireddy Dhanunjaya - - 2008
BACKGROUND: The use of electrical stun guns has been rising among law enforcement authorities for subduing violent subjects. Multiple reports have raised concerns over their safety. The cardiovascular safety profile of these devices in relationship to the position of delivery on the torso has not been well studied. METHODS: We ...
Yamamoto Takeshi - - 2008
The use of automated external defibrillators (AEDs) has increased the number of survivors of out-of-hospital cardiac arrest. The AED has a high specificity and moderately high sensitivity in detecting rhythms appropriately treated by defibrillation. However, a few shockable rhythms are misdiagnosed by the AED. Two cases of inappropriate analyses by ...
Erkapic Damir - - 2008
We described a case of a 58-year-old man with organic changes consistent with right ventricular cardiomyopathy. He also had a loss-of-function mutation in the cardiac sodium channel gene SCN5A, described in Brugada syndrome. He first presented with non-sustained ventricular tachycardia and was implanted with an implantable cardioverter defibrillator. He remained ...
Philips David A - - 2010
We present the case of a 74-year-old man with non-ischemic dilatated cardiomyopathy and an implantable cardioverter-defibrillator presenting with a serum potassium of 2.6 mmol/L, recurrent unstable ventricular tachycardia, and multiple defibrillations. Administration of a rapid bolus of 20 mEq KCL solution via central venous access, followed by an additional total ...
Michael Kevin A - - 2008
Arrhythmogenic right ventricular dysplasia (ARVD) encompasses a spectrum of presentations including ventricular tachycardia, sudden cardiac death and heart failure. Complete right ventricular disarticulation was effective in a young athletic male who was refractory to drug therapy and experienced recurrent shock therapies from an implantable cardioverter-defibrillator that were incapacitating. The case ...
Bunch T Jared - - 2008
AIM: Studies have shown an association between obesity and total mortality among people with and without coronary artery disease. This study reviews outcomes among obese survivors of ventricular fibrillation in out-of-hospital cardiac arrest. METHODS: All survivors of ventricular fibrillation in out-of-hospital cardiac arrest who presented in Rochester, MN from November ...
Oudit Gavin Y - - 2008
The present case describes a patient who received inappropriate, but potentially life-saving, therapy from her implantable cardioverter defibrillator (ICD) in the setting of acute hyperkalemia (plasma potassium concentration = 8 mM). Hyperkalemia was associated with the development of a slow sinusoidal ventricular tachycardia, at a rate of 100 beats/min to ...
Bardy Gust H - - 2008
Most cardiac arrests occur in the home, where emergency medical services (EMS) systems are challenged to provide timely care. Because a large proportion of sudden cardiac arrests (SCAs) are due to ventricular tachycardia or ventricular fibrillation, home use of an automated external defibrillator (AED) might offer an opportunity to decrease ...
Murphy I - - 2008
BACKGROUND: A 54-year-old woman was referred to our service with intractable ventricular arrhythmias secondary to a familial long-QT syndrome. Her first presentation was 4 years previously, when she suffered a cardiac arrest, at this time an (Automatic Implantable Cardioverter Defibrillator) AICD device was inserted and she was commenced on sympathetic ...
Alsheikh-Ali Alawi A - - 2008
INTRODUCTION: Little is known about the risk of appropriate implantable cardioverter-defibrillator (ICD) therapy outside the context of controlled clinical trials where routine practice patients are followed for longer durations and questions of device replacement frequently arise. We assessed the incidence and time-dependence of appropriate ICD therapy in a routine clinical ...
Weiss James N JN UCLA Cardiovascular Research Laboratory, Department of Medicine (Cardiology), David Geffen School of Medicine at UCLA, Los Angeles, California, USA. - - 2008
Sudden cardiac death due to ventricular fibrillation occurs when a dynamic interaction between triggers and substrate leads to the development of reentry, initiation of ventricular tachycardia, and its degeneration to fibrillation. To move beyond the implantable cardioverter-defibrillator as the only effective therapy for aborting sudden cardiac death, an improved understanding ...
Mansour Fadi - - 2008
Implantable cardioverter-defibrillators (ICD) are widely regarded as the treatment of choice for primary and secondary prevention against sudden cardiac death across a broad spectrum of underlying pathologies. Over the past 20 years, ICDs have evolved into complex multifunctional units capable of recording, chronicling, self-testing, and delivering interventional therapies. Technological advances ...
Kataoka Masaharu - - 2008
BACKGROUND: A 25-year-old woman experienced three episodes of syncope over the course of 2 years. The attacks all occurred just after she had sat down, and two were accompanied by convulsions. She had no obvious prodromes and no personal or family history of cardiovascular disease. INVESTIGATIONS: Electrocardiography, chest radiography, echocardiography, ...
Chamberlain Douglas - - 2008
The new resuscitation guidelines permit compressions before delayed, defibrillation, a change that has generally been welcomed. The benefits are generally assumed to relate to the immediate provision of limited coronary perfusion with protection or replenishment of myocardial metabolic reserves. In this paper we argue that the concept is inadequate to ...
Jenkins David J A - - 2008
A recent Cochrane meta-analysis did not confirm the benefits of fish and fish oil in the secondary prevention of cardiac death and myocardial infarction. We performed a meta-analysis of randomized controlled trials that examined the effect of fish-oil supplementation on ventricular fibrillation and ventricular tachycardia to determine the overall effect ...
Baranchuk Adrian - - 2008
A 60-year-old man presented to the emergency department with a left eye orbital rupture sustained during a fall due to syncope shortly after smoking more than his usual amount of marijuana. The patient reported experiencing a shock from his implantable cardioverter-defibrillator (ICD) device prior to the loss of consciousness. There ...
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