Search Results
Results 401 - 450 of 1546
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Omran Heyder - - 2005
Thromboemoblism is the most feared complication of atrial fibrillation. Percutaneous left atrial appendage occlusion is a new interventional procedure for reducing thromboembolic risk in patients with atrial fibrillation. The paper reports of a post mortem analysis of the device demonstrating that one year after implantation the atrial surface of the ...
Alves Marcos V C - - 2005
To date, almost all patients reported with hypoplasia of the left heart have had usual atrial arrangement, with a small proportion known to have left or right isomerism. As far as I am aware, however, only one patient has previously been described with mirror-imaged arrangement of the heart and organs. ...
Verma Sumit - - 2005
This report describes a phenomenon observed during implantation of a left ventricular lead through the coronary sinus. During coronary sinus venography there was reflux of dye from the coronary sinus ostium towards the distal part of the sinus against the anticipated direction of flow. This was correlated to elevation of ...
Quintero Rubén A - - 2005
OBJECTIVE: The purpose of this study was to report a novel technique, laser atrial septotomy, for the in utero treatment of hypoplastic left heart syndrome with intact atrial septum. STUDY DESIGN: In utero atrial septotomy by Neodymium-YAG laser photofulguration in a fetus with hypoplastic left heart syndrome (HLHS) and intact ...
Pavlovic Mladen - - 2005
Cardiopulmonary bypass (CPB) may induce serious side effects, potentially leading to myocardial failure. The Na(+)-K(+)-ATPase is a key component for myocardial function. Due to its developmental regulation, results from adult studies cannot be adopted to the situation in childhood. Right atrial myocardium from patients with left-to-right shunts at atrial level ...
Boriani Giuseppe - - 2005
While verapamil has been proposed as a treatment for reducing electrophysiological remodeling due to atrial fibrillation and atrial tachyarrhythmias, no previous study has tested its effects in brady-tachy patients implanted with a dual-chamber pacemaker. Fourteen patients with frequent episodes of atrial fibrillation (> or =2 episodes/month) in the setting of ...
Simpson Christopher S - - 2005
Atrial flutter and atrial fibrillation have a complex relationship that has mechanistic, diagnostic, therapeutic and prognostic components. While thromboembolic risk management and pharmacological strategies share many similarities, there are important differences. Radiofrequency ablation should be considered to be an early, first-line alternative to pharmacological strategies for many patients with atrial ...
Donal Erwan - - 2005
The increasing prevalence of stroke and atrial fibrillation is a stimulus for new therapeutic strategies and also warrants a review of imaging modalities of the most important source of cardiac systemic embolic events: the left atrial appendage (LAA). This blind-ended, complex structure is embryologically distinct from the body of the ...
Milliez Paul - - 2005
AIMS: Congestive heart failure (CHF) is associated with severe structural changes of atria, contributing to impaired atrial function and the risk of arrhythmia. This study investigated the effects of CHF treatments on atrial remodelling. METHODS AND RESULTS: Three months after myocardial infarction (MI), rats were treated for 1 month with ...
Barold S Serge - - 2005
The Medtronic Kappa 700 and 900 pacemaker family offers a dedicated Blanked Flutter Search algorithm specifically designed for the detection of atrial flutter. This report describes 5 cases that demonstrate how the Blanked Flutter Search algorithm can be activated in the absence of atrial tachycardia, atrial flutter, or sinus tachycardia ...
Fazelifar Amir Farjam - - 2005
. Atrial standstill is an extremely uncommon arrhythmia that rarely appears to be familial and genetically determined. Atrial standstill has been associated with several conditions including, but not restricted to, congenital heart disease, valvular heart disease, conduction disturbances, Brugada syndrome, myocardial infarction, and amyloidosis. Only a few cases of familial ...
Khaja Azamuddin - - 2005
BACKGROUND: Cardiac anatomists have known the presence of a group of specialized fibers connecting the right and left atrium for years. However, only recently have clinical cardiologists come to recognize the potential importance of this specialized conduction system. Anatomical and microscopic studies have shown that the Bachmann's bundle (BB) represents ...
Demiralp Ergun - - 2005
Twelve-lead electrocardiograms revealed no atrial activity and a wide QRS escape rhythm at 38 beats/min in a 20-year-old man who presented with syncope. Doppler echocardiography documented the absence of A wave both in the tricuspid and mitral valve flow. The only mechanical activity was documented at the left atrial appendage. ...
Tjandrawidjaja Michael C - - 2005
BACKGROUND: The relevance of the atrial coronary anatomy in the pathogenesis of atrial arrhythmias and atrioventricular (AV) block complicating acute myocardial infarction (AMI) remains unclear. OBJECTIVES: We evaluated the location of the infarct-related coronary lesion relative to the principal atrial branches (ie, sinoatrial nodal, AV nodal, left atrial circumflex) in ...
Reade Clifton C - - 2005
OBJECTIVES: In minimally invasive and robotic mitral valve surgery, a blade retractor is used to elevate the left atrial roof, which often distorts tissue and impairs visualization. We tested the hemodynamic and histologic changes of intra-atrial suction, using a new suction retractor that may improve stabilization and visualization. METHODS: Swine ...
Malavasi Vincenzo L - - 2005
We describe a case of isthmus-dependant atrial flutter ablation with a superior approach due to an anomalous inferior vena cava (IVC), azygos, and emiazygos continuation. A 56-year-old man was referred to our institution for the treatment of a common atrial flutter. Two years prior, the patient had an attempted electrophysiological ...
Hirose Masamichi - - 2005
Mechanism of chronic volume overload-induced AT. INTRODUCTION: Atrial dilatation associated with chronic volume overload (CVO) plays an important role in the development of atrial fibrillation (AF). However, the underlying mechanisms are unknown. METHODS AND RESULTS: CVO-induced atrial dilatation was created in Japanese white rabbits using arteriovenous shunt formation for 6 ...
Miyazaki Hidekazu - - 2005
OBJECTIVES: Atrial septal pacing via a trans-septal breakthrough site within the right atrial septum can shorten global atrial activation time, resulting in significant reduction of recurrence of atrial fibrillation events. This study examined whether this pacing method will lead to resynchronization of atrial contraction and its benefit on hemodynamic function ...
Kallergis Eleftherios M - - 2005
STUDY OBJECTIVES: Although inhaled beta2-agonists are in widespread use, several reports question their potential arrhythmogenic effects. The purpose of this study was to evaluate the cardiac electrophysiologic effects of a single, regular dose of an inhaled beta2-agonist in humans. DESIGN: Prospective study. SETTING: Tertiary referral center. PATIENTS: Six patients with ...
Jayakar David - - 2005
The left atrial appendage is one source of thromboemobolus. Complete occlusion of this appendage is required to sever communication with the left atrium; however, current ligation techniques can potentially leave residual communication. A novel technique of occluding the appendage has been developed using a bipolar device and radiofrequency energy. Twelve ...
Nicolle A P - - 2005
A 6-year-old female cat developed pleural and abdominal effusion. Cardiac ultrasound and 2D color tissue Doppler imaging revealed restrictive cardiomyopathy with severe biatrial dilatation and hypertension. This cardiomyopathy was associated with atrial septal aneurysm and a patent foramen ovale. The atrial septal aneurysm involved the entire atrial septum. Necropsy and ...
Dos L - - 2005
OBJECTIVES: To evaluate late mortality and morbidity after an atrial switch procedure for correction of transposition of the great arteries (TGA) and to assess predictive factors for adverse outcome. SETTING: Tertiary referral centre. DESIGN AND PATIENTS: Retrospective follow up study of 137 patients surviving hospitalisation for TGA atrial switch procedure ...
Kojodjojo P - - 2005
Atrial flutter is a common arrhythmia. In the critical care setting, the arrhythmia may present in any patient, but it is most commonly seen in patients with impaired ventricular function, valvular disease, atrial dilatation or after cardiac surgery. We present a 68-year-old lady with recurrent poorly tolerated atrial flutter that ...
Fayad Georges - - 2005
BACKGROUND: Restoration of sinus rhythm is thought to lead to a reduction in left atrial size and to recovery of atrial contraction. We aimed to investigate changes in atrial size and function in patients undergoing radiofrequency ablation for atrial fibrillation during mitral valve surgery. METHODS: In a prospective study, 70 ...
Narayan Sanjiv M - - 2005
OBJECTIVES: The aim of this study was to separate isthmus-dependent atrial flutter (IDAFL) from non-isthmus-dependent atrial flutter (NIDAFL) from the electrocardiogram (ECG) based on functional differences. BACKGROUND: The ECG analyses of F-wave shape suboptimally separate NIDAFL from IDAFL. The authors hypothesized that anatomic and functional differences may result in greater ...
Pedersen Ole Dyg - - 2005
BACKGROUND: Reports on the prognostic importance of atrial fibrillation following myocardial infarction have provided considerable variation in results. Thus, this study examined the impact of left ventricular systolic function and congestive heart failure on the prognostic importance of atrial fibrillation in acute myocardial infarction patients that might explain previous discrepancies. ...
Baysan Oben - - 2005
Acute myocardial infarction results in not only left ventricular but also left atrial dysfunction. Left atrial function is important for optimal filling of the left ventricle. In this study, we aimed at evaluating left atrial functions 6 months after acute myocardial infarction in three different patient groups (thrombolytic therapy, primary ...
Ricci Renato Pietro - - 2005
Pacing prevention algorithms have been introduced in order to maximize the benefits of atrial pacing in atrial fibrillation prevention. It has been demonstrated that algorithms actually keep overdrive atrial pacing, reduce atrial premature contractions, and prevent short-long atrial cycle phenomenon, with good patient tolerance. However, clinical studies showed inconsistent benefits ...
Strickberger S Adam - - 2005
OBJECTIVES: The purpose of this study was to correlate patient-reported symptoms of atrial fibrillation with the underlying rhythm. BACKGROUND: The reliability of patient-reported symptoms as a marker of atrial fibrillation recurrence has not been well studied. METHODS: This prospective multicenter trial correlated the recurrence of atrial tachyarrhythmias with symptoms in ...
Pasquini Lucia - - 2005
In a prospective audit of consecutive referrals for fetal echocardiography between 1997 and 2003, we documented all instances of an abnormal arrangement of the abdominal vessels. We then established the structure of the heart in these fetuses, noting any extra-cardiac associations, and the eventual outcomes. We found a cardiac abnormality ...
Hill Sharon L - - 2005
Newborns with hypoplastic left heart syndrome and intact atrial septum present an emergent and unique challenge to a children's heart center. This case report describes new transcatheter techniques (use of radiofrequency energy to perforate the atrial septum followed by cutting balloon and static balloon septoplasty) and novel use of a ...
Sparks Paul B - - 2005
Considerable advances have been made in both the understanding of and the curative treatment for atrial arrhythmias over the last decade. Radiofrequency ablation of typical right atrial flutter and focal atrial tachycardia using standard catheters is commonplace and is associated with success rates of over 95%. Recently developed 3-D mapping ...
Zupan Igor - - 2005
Rapid atrial rates cause electrical, structural remodeling, and neuro-humoral changes. This study compares the effects of mechanical remodeling on plasma renin activity (PRA) and atrial natriuretic peptide (ANP) secretion. Eight beagles were subjected to rapid atrial pacing (AP) at 400 beats/min for 16 days. After complete recovery of left ventricular ...
Rashba Eric J - - 2005
OBJECTIVES: The purpose of this study was to identify clinical predictors of atrial defibrillation thresholds (DFTs) with standard implantable cardioverter-defibrillator (ICD) leads. BACKGROUND: Atrial defibrillation can be achieved with active pectoral, dual-coil transvenous ICD lead systems. If clinical predictors of atrial defibrillation efficacy with these lead systems were identified, they ...
Raman Subha V - - 2005
PURPOSE: To implement a cardiac magnetic resonance (CMR)-based protocol to define atrial structure and function in individuals with paroxysmal atrial fibrillation (PAF), heritable cardiac conduction and myocardial disease with atrial dysrhtyhmias (HCCMD), and healthy controls. METHODS: Fifteen controls, 20 PAF, and 12 HCCMD subjects underwent CMR examination including: multislice short-axis ...
Quintana Miguel - - 2005
BACKGROUND: The appropriate evaluation of atrial electrical function is only possible by means of invasive electrophysiology techniques, which are expensive and therefore not suitable for widespread use. Mechanical atrial function is mainly determined from atrial volumes and volume-derived indices that are load-dependent, time-consuming and difficult to reproduce because they are ...
Narolska N A - - 2005
OBJECTIVE: Cardiac energetics and performance depend on the expression level of the fast (alpha-) and slow (beta-) myosin heavy chain (MHC) isoform. In ventricular tissue, the beta-MHC isoform predominates, whereas in atrial tissue a variable mixture of alpha- and beta-MHC is found. In several cardiac diseases, the slow isoform is ...
Golovchiner Gregory - - 2005
BACKGROUND: Left atrial radiofrequency ablation is the most common technique for the treatment of atrial fibrillation during mitral valve surgery. Reported failure rates range between 15% and 30%, with some patients remaining in atrial fibrillation and others experiencing atrial flutter. The incidence and nature of the postoperative atrial flutter is ...
Nattel Stanley - - 2005
PURPOSE OF REVIEW: Atrial fibrillation usually occurs in the context of an atrial substrate produced by alterations in atrial tissue properties referred to as remodeling. Remodeling can result from cardiac disease, cardiac arrhythmias, or biologic processes such as senescence. Recent advances in understanding remodeling have allowed for insights into mechanisms ...
Anderson Jeffrey L - - 2005
BACKGROUND: Cardiovascular magnetic resonance (CMR) has superior spatial resolution compared with echocardiography, but assessment of normal measurements has lagged behind its increasing clinical application. We assessed atrial size by CMR in healthy and diseased subjects to determine normal adult ranges. METHODS: Twenty normal adults and 20 cardiac patients with hypertrophic ...
Lukac Peter - - 2005
OBJECTIVES: The purpose of this study was to compare atrial tachycardia circuits after a range of cardiac operations. BACKGROUND: Knowledge of circuits occurring in a given postsurgical substrate should help to ablate these challenging tachycardias and develop potential preventive strategies. METHODS: We analyzed tachycardia circuits in 83 consecutive patients (60 ...
Takagi M - - 2005
To evaluate the acute effects of atrial pacing at different pacing sites on mechanical stunning after cardioversion of atrial fibrillation (AF). Tertiary referral centre. 20 patients with persistent AF were studied. Spontaneous echo contrast (SEC), left atrial appendage emptying velocity (LAAEV), and left atrial appendage emptying fraction (LAAEF) were assessed ...
Theuns Dominic A M J - - 2004
OBJECTIVES: The purpose of this randomized study was to investigate the performance of single- and dual-chamber tachyarrhythmia detection algorithms. BACKGROUND: A proposed benefit of dual-chamber implantable cardioverter-defibrillators (ICDs) is improved specificity of tachyarrhythmia detection. METHODS: All ICD candidates received a dual-chamber ICD and were randomized to programmed single- or dual-chamber ...
McMahon C J - - 2004
Underlying mechanisms in the development of atrial flutter or intra-atrial re-entry tachycardia in patients with structural cardiac abnormalities remain poorly defined. The right atrial myocardium from two patients with congenital heart disease was evaluated, of whom one presented with severe right atrial dilation and arrhythmia and the other with a ...
Fatemi Marjaneh - - 2004
INTRODUCTION: Entrainment mapping is a useful procedure for localizing macroreentrant tachycardia circuits. In patients with isthmus-dependent atrial flutter, entrainment mapping from the isthmus during tachycardia results in postpacing intervals (PPI) close to the tachycardia cycle length (TCL). However, the influence of antiarrhythmic drugs on the method's value is not clearly ...
Vereckei Andrais - - 2004
This is a case report of a patient with group beating characterized by progressively shortening P-P intervals and at the same time gradually increasing P-R intervals showing R-P/P-R interval reciprocity due to the simultaneous occurrence of sino-atrial (S-A) Wenckebach and atrio-ventricular (A-V) Wenckebach-like periodicities. All group beatings are terminated by ...
Soufan Alexandre T - - 2004
Firm knowledge about the formation of the atrial components and of the variations seen in congenital cardiac malformations and abnormal atrial rhythms is fundamental to our understanding of the normal structure of the definitive atrial chambers. The atrial region is relatively inaccessible and has continued to be the source of ...
Lemola Kristina - - 2004
OBJECTIVES: The purpose of this study was to determine the effect of left atrial circumferential ablation on the size of the left atrium and pulmonary veins (PVs). BACKGROUND: The long-term effects of left atrial circumferential ablation on left atrial and PV size and anatomy have not been analyzed in quantitative ...
Kobza Richard - - 2004
INTRODUCTION: Intraoperative radiofrequency (RF) ablation is an effective treatment of atrial fibrillation (AF). However, secondary arrhythmias late after ablation may complicate the patient's course. We report on the incidence, mechanisms, and treatment of gap-related atrial flutter and other secondary arrhythmias during long-term follow-up. METHODS AND RESULTS: In 129 patients who ...
Goswami Kewal C - - 2004
BACKGROUND: The purpose of this study was to prospectively evaluate a large group of consecutive, non-anticoagulated patients with severe rheumatic mitral stenosis and to analyze the left atrial appendage function in relation to left atrial appendage clot and spontaneous echo contrast formation. METHODS AND RESULTS: We prospectively studied left atrial ...
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