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Results 201 - 250 of 1015
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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 - - 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 ...
Thong Tran - - 2008
A predictor of an imminent episode of ventricular tachyarrhythmia, namely ventricular tachycardia and ventricular fibrillation has been developed. It only uses R-R records. The previous work was based on long R-R records stored in the memory of implantable cardioverter-defibrillators. With 1.8 hour of data, sensitivity of 53-83% can be achieved ...
Lawless Christine E - - 2008
In an athletic population, the incidence of palpitations varies from 0.3% to as high as 70%, depending on age and type of sport being studied. Palpitations, or an awareness of an increased or abnormal heart beat, are rare in the school-age athlete, but much more common in older endurance athletes. ...
Ristagno G - - 2008
In the present study we sought to examine the efficacy of an electrocardiographic parameter, 'amplitude spectrum area' (AMSA), to predict the likelihood that any one electrical shock would restore a perfusing rhythm during cardiopulmonary resuscitation in human victims of out-of-hospital cardiac arrest. AMSA analysis is not invalidated by artefacts produced ...
Korantzopoulos Panagiotis - - 2008
In this report we briefly describe a patient with a dual chamber implantable cardioverter defibrillator in the context of severe ischemic cardiomyopathy who developed persistent atrial fibrillation. After appropriate anticoagulation and under mild sedation the patient was successfully cardioverted to sinus rhythm after a programmed ventricular synchronized defibrillation using his ...
Israel Carsten W - - 2008
PURPOSE OF REVIEW: With wider indications for implantable cardioverter defibrillator therapy, more patients at lower risk for ventricular tachyarrhythmia receive this treatment. To maintain the ratio of benefit versus side-effects at an acceptable level, the risk of inappropriate implantable cardioverter defibrillator therapy has to be minimized. RECENT FINDINGS: Implantable cardioverter ...
Ugajin Takuhiro - - 2008
While ventricular premature contractions have been noted during colonoscopy (CS), ventricular fibrillation (VF) is rare. We recently had a patient who developed VF during CS and recovered without any sequelae despite severe complications after cardiopulmonary resuscitation (CPR). If electrocardiogram (ECG) monitoring had been done during CS, a direct current shock ...
Krivan Lubomír - - 2008
The authors present two cases of patients with perforation of the right ventricular wall by the implantable cardioverter defibrillator (ICD) lead. The complication was resolved by cardiosurgical revision and epicardial leads stitched onto the diaphragmatic wall of the heart. The perforation was identified by electrical parameter changes of the leads, ...
Annamaria Martino - - 2008
External electrical cardioversion or defibrillation may be necessary in patients with implanted cardiac pacemaker (PM) or implantable cardioverter defibrillator (ICD). Sudden discharge of high electrical energy employed in direct current (DC) transthoracic countershock may damage the PM/ICD system resulting in a series of possible device malfunctions. For this reason, when ...
Mitchell Judith E - - 2008
The SCD-HeFT demonstrated that implantable cardioverter/defibrillator (ICD) therapy significantly improved survival compared to medical therapy alone in stable moderately symptomatic heart failure patients with an ejection fraction < or = 35%. The purpose of this report is to describe the outcomes in African Americans (AAs) and other minorities. Of 2521 ...
Chevalier Philippe - - 2007
The effects of chronic oral azimilide therapy on the ventricular defibrillation threshold (DFT) during ischemia are unknown. The effects of azimilide on defibrillation efficacy under ischemic condition were investigated in a closed-chest animal model. Azimilide (20 mg/kg/d) was administered orally for 7 days to 10 pigs (20 to 25 kg). ...
Hooks Darren A - - 2007
The response of the heart to electrical shock, electrical propagation in sinus rhythm, and the spatiotemporal dynamics of ventricular fibrillation all depend critically on the electrical anisotropy of cardiac tissue. A long-held view of cardiac electrical anisotropy is that electrical conductivity is greatest along the myocyte axis allowing most rapid ...
Wu Tsu-Juey - - 2008
INTRODUCTION: The mechanisms that lower the efficacy of electrical defibrillation during prolonged global ischemia remain unclear. METHODS AND RESULTS: Epicardial activation patterns during attempted electrical defibrillation were studied in 18 Langendorff-perfused rabbit hearts at baseline, after 5-minute no-flow global ischemia and after 10-minute reperfusion. DFT(50) (voltage required to achieve 50% ...
Littmann L - - 2007
Electrical storm is the clustering of hemodynamically destabilizing ventricular tachycardia or ventricular fibrillation that typically requires multiple electrical cardioversions or defibrillations within a 24-hour period. Electrical storm is frequently seen in the acute phase of myocardial infarction, in patients with the genetic arrhythmia syndromes, and in patients with implanted cardioverters-defibrillators. ...
Goldenberg Ilan - - 2007
Patients who have left ventricular dysfunction and heart failure (HF) are at high risk for ventricular tachyarrhythmias and sudden cardiac death. Randomized clinical trials have demonstrated that pharmacologic management with antiarrhythmic drugs has limited efficacy for the prevention of arrhythmic mortality in this high-risk population, whereas implantation of a defibrillator ...
Jones P - - 2007
Cardiac arrest in children is not often due to a disturbance in rhythm that is amenable to electrical defibrillation, contrary to the situation in adults. When a shockable rhythm is present, defibrillation using an external electric shock applied at an early stage after pre-oxygenation and chest compressions is of proven ...
Rauwolf T - - 2007
The present study evaluates the incidence of various complications in implanted cardiac defibrillators (ICD) therapy due to ventricular oversensing (VO) and its complications. From June 1998 to May 2005, we retrospectively screened 518 patients (1085.6 patient years) for the occurrence of VO episodes (441 male, 77 female). The overall incidence ...
Vassallo Patricia - - 2007
CONTEXT: Although amiodarone is approved by the US Food and Drug Administration only for refractory ventricular arrhythmias, it is one of the most frequently prescribed antiarrhythmic medications in the United States. OBJECTIVE: To evaluate and synthesize evidence regarding optimal use of amiodarone for various arrhythmias. EVIDENCE ACQUISITION: Systematic search of ...
Dimitri Hany - - 2007
We present a 51-year-old morbidly obese man who underwent insertion of a single-chamber implantable cardioverter defibrillator for monomorphic ventricular tachycardia occurring after myocardial infarction. After a period of satisfactory device function, a sudden change in R-wave with atrial over-sensing heralded inappropriate defibrillation and induction of ventricular fibrillation, with subsequent death ...
Singh Steven - - 2007
Implantable cardioverter defibrillators (ICDs) are increasingly used for the prevention of sudden cardiac death in patients with life-threatening ventricular arrhythmias (VAs); however, there is a potential for severe and debilitating anxiety caused by symptoms associated with ICD therapy and anticipation of shocks. Anxiety is a psycho-logic stressor, including physiologic components ...
Li Yongqin - - 2007
Sudden death due to ventricular fibrillation (VF) is a catastrophic event, especially in out-of-hospital settings. Prompt detection of VF and preparedness to intervene with cardiopulmonary resuscitation (CPR) and especially the delivery of an electrical shock is potentially lifesaving. The reliability and accuracy of automated VF detection by current versions of ...
Mollerus Michael - - 2007
Implantable cardioverter-defibrillators (ICDs) have a proven mortality benefit in appropriately selected people. Several retrospective studies, though, have postulated that appropriate ICD therapy may lead to fatal, pulseless electrical alternans (PEA). This case report describes an episode of transient PEA from myocardial stunning and standstill following defibrillation threshold testing. The risk ...
Mansour Fadi - - 2007
A 36 year-old man with hypertrophic cardiomyopathy and an ATLAS + DR implantable cardioverter defibrillator (ICD) (St. Jude Medical, Inc., St. Paul, MN, USA) for primary prevention received a shock while cycling. The ventricular fibrillation detection threshold was 182 beats/min. An additional monitoring zone was programmed to 156 beats/min with ...
Ideker Raymond E - - 2007
There is only a small amount of experimental data about whether the TASER X26, a nonlethal weapon that delivers a series of brief electrical pulses to cause involuntary muscular contraction to temporarily incapacitate an individual, can initiate ventricular fibrillation to cause sudden cardiac arrest either immediately or sometime after its ...
Davis Jonathan E - - 2009
Cardiac electrical storm has been described as three or more distinct episodes of ventricular fibrillation or hemodynamically destabilizing ventricular tachycardia in a 24-h period, typically requiring treatment with electrical cardioversion or defibrillation. We report the case of a 45-year-old man who presented to the Emergency Department with idiopathic cardiac electrical ...
Karao─čuz Remzi - - 2007
Implantable cardioverter defibrillator (ICD) implantation is a common approach in patients at high risk of sudden cardiac death. Verification of defibrillation efficacy by defibrillation threshold (DFT) testing during ICD implantation is the current standard. Traditionally, a safety margin of at least 10 J between the maximum output of the pulse ...
Thong Tran - - 2007
BACKGROUND: A reliable predictor of an imminent episode of ventricular tachyarrhythmia that could be incorporated in an implantable defibrillator capable of preventive therapy would have important clinical utility. METHOD: A test set of 208 R-R records saved by defibrillators spanning a mean of 1.6 hours before sustained tachyarrhythmia were used ...
Nemec Jan - - 2007
A case of a patient with runaway implantable cardioverter defibrillator (ICD) due to radiation therapy of a lung cancer is reported. This manifested as poorly tolerated wide complex tachycardia due to inappropriate rapid ventricular pacing, The event terminated with polymorphic VT, which inhibited pacing and ceased spontaneously before ICD discharge. ...
Niemann James T - - 2007
OBJECTIVES: The standard porcine cardiac arrest model uses electrical induction of ventricular fibrillation. Reported restoration of spontaneous circulation and survival rates in this model are as high as 90% for ventricular fibrillation durations of 7-10 mins, values substantially greater than rates in the clinical population (i.e., 20% to 30%). A ...
Faggiano Pompilio - - 2007
We report the case of a patient admitted to the hospital on two different occasions, separated by a time interval of 12 years, with the same clinical picture: acute anterior myocardial infarction complicated by early ventricular fibrillation. The patient was successfully resuscitated because, in both circumstances, he was 'lucky' to ...
Kantoch Michal J - - 2007
A 3.5-year-old child with hypertrophic obstructive cardiomyopathy and recurrent syncope underwent surgical left-ventricular outflow tract myectomy and implantation of a single-chamber automatic cardioverter defibrillator. A single-coil active fixation lead was introduced via a purse-string suture in the right atrial appendage and the lead tip positioned and fixed in the right-ventricular ...
Quercia O - - 2008
A 54-year-old male, who had presented 2 ventricular fibrillation (VF) episodes with post-anoxic coma and later a return to consciousness and to a sinusal rhythm after defibrillation, have been placed a ventricular intracavitary stimulator (AICD). Since all the tests including the coronarygraphy have been found normal, we have paid attention ...
Holley Loraine K - - 2007
The past 25 years have seen the implantable cardioverter defibrillator emerge as the treatment of choice for ventricular arrhythmias with reduction in size but increased therapeutic options. Understanding the complex mechanisms of ventricular arrhythmias and defibrillation in normal and diseased hearts has been the focus of many research teams including ...
Indik Julia H - - 2007
OBJECTIVE: Future automated external defibrillators are being designed to direct rescue efforts (chest compressions first vs. defibrillation) by inferring the duration of ventricular fibrillation based on its waveform characteristics such as frequency content. This approach assumes that the ventricular fibrillation waveform is an appropriate surrogate for ventricular fibrillation duration and ...
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