Search Results
Results 301 - 350 of 1767
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Spergel Lawrence M - - 2008
The use of central venous hemodialysis catheters (CVC) continues to be high among the incident as well as the prevalent HD patients. Whereas many strategies have been implemented to decrease the use of CVCs, their placement rates have doubled since 1996. While many factors, including late referral, are responsible for ...
Maya Ivan D - - 2008
Catheter-related bacteremia is a major cause of morbidity and mortality among catheter-dependent hemodialysis patients. Microorganism biofilm matrix formation in the catheter is the pathogenic process of this entity. Administration of systemic antibiotics and removal of the offending catheter is the most logical treatment. This article discusses an alternative option, instillation ...
d'Avila Andre - - 2008
Technologic advancements have resulted in the more widespread use of catheter ablation to restore sinus rhythm in patients with atrial fibrillation (AF) and elicit improvement in symptoms, quality of life, and prognosis. However, the effectiveness of this procedure to prevent the occurrence of heart failure and stroke while reducing mortality ...
Boersma Lucas V A - - 2008
BACKGROUND: Pulmonary vein (PV) isolation for ablation of atrial fibrillation (AF) remains a complex and lengthy procedure. OBJECTIVE: The purpose of this study was to evaluate the feasibility and safety of a novel multielectrode catheter that delivers duty-cycled bipolar and unipolar radiofrequency (RF) energy. METHODS: Patients eligible for catheter ablation ...
Della Bella Paolo - - 2008
Catheter ablation of untolerated and unstable ventricular tachycardia may not be performed using a conventional activation mapping tecnique. The noncontact mapping system enables reconstruction of the spreading of activation wave through a virtually generated ventricular chamber, even from a single tachycardia beat, and was introduced as a tool to guide ...
Hasdemir Can - - 2008
A 44-year-old female undergoing radiofrequency ablation in the right ventricular outflow tract for symptomatic, frequent premature ventricular contractions developed stress cardiomyopathy (Tako-Tsubo). Stress cardiomyopathy was probably due to hyperadrenergic state induced by the procedure itself, dobutamine infusion, sympathetic nerve stimulation at the ablation site, and parasympathetic withdrawal with atropine administration.
Szilágyi Szabolcs - - 2008
AIMS: Phrenic nerve stimulation (PNS), which is often intolerable for the patient, is a known complication of resynchronization therapy. We describe a new, minimal invasive method for treating PNS. METHODS AND RESULTS: Untreatable PNS was found in nine cardiac resynchronization therapy patients with distal coronary sinus (CS) lead position 6 ...
Ghosh Subham - - 2008
Cardiac memory refers to a change in ventricular repolarization induced by and persisting for minutes to months after cessation of a period of altered ventricular activation (eg, resulting from pacing or preexcitation in patients with Wolff-Parkinson-White syndrome). ECG imaging (ECGI) is a novel imaging modality for noninvasive electroanatomic mapping of ...
Das Mithilesh K - - 2008
Catheter ablation is an effective therapy for symptomatic ventricular arrhythmia (VA) in patients with and without structural heart disease. It is the treatment of choice to cure or reduce recurrent VA in patients who have an implantable cardioverter defibrillator and can be a life-saving procedure in patients who have electrical ...
Ernst Sabine - - 2009
INTRODUCTION: We report on a 63-year-old female patient in whom an electrophysiologic study discovered a hemi-azygos continuation. Using the magnetic navigation system, remote-controlled ablation was performed in conjunction with the 3D electroanatomical mapping system. METHODS AND RESULTS: Failing the attempt to advance a diagnostic catheter from the femoral vein, a ...
Wirsing Melanie - - 2008
BACKGROUND: Traditionally, the positioning of central venous catheters (CVCs) outside the right atrium (RA) in patients receiving intensive care is determined by surrogate landmarks on bedside chest radiographs (CXRs). The validity of this method was examined by comparing readings of radiologists with the results of transesophageal echocardiography (TEE). METHODS: Prospective ...
Raake Philip W - - 2008
Myocardial G protein-coupled receptor kinase (GRK)2 is a critical regulator of cardiac beta-adrenergic receptor (betaAR) signaling and cardiac function. Its upregulation in heart failure may further depress cardiac function and contribute to mortality in this syndrome. Preventing GRK2 translocation to activated betaAR with a GRK2-derived peptide that binds G(beta)gamma (betaARKct) ...
Yamada Takumi - - 2008
A 31-year-old woman with idiopathic premature ventricular contractions originating from the tricuspid annulus (TA) underwent electrophysiological testing. Activation mapping with a 20-pole bipolar Halo-type catheter positioned along the TA revealed the earliest ventricular activation at a site between 7 and 8 o'clock along the TA. A reversal in the polarity ...
Efremidis Michalis - - 2008
We report on a patient with transient atrioventricular block and ST-segment elevation mimicking the ECG of myocardial infarction during transseptal puncture for radiofrequency catheter ablation of atrial fibrillation. Symptoms and EGG findings resolved spontaneously. A neurally-mediated mechanism, activated by the mechanical effects of the transseptal puncture on the interatrial septum ...
Pak Hui-Nam - - 2008
BACKGROUND: Radiofrequency catheter ablation (RFCA) targeting the left ventricular posteroseptum (LVPS) and posterior papillary muscle (PPM) terminates or prevents ventricular fibrillation (VF) in rabbit and dog hearts. However, whether the mechanism of VF maintenance is reentry or focal Purkinje firing is unclear. METHODS AND RESULTS: In the present study the ...
Dosdall Derek J - - 2008
Endocardial mapping has suggested that Purkinje fibers may play a role in the maintenance of long-duration ventricular fibrillation (LDVF). To determine the influence of Purkinje fibers on LDVF, we chemically ablated the Purkinje system with Lugol solution and recorded endocardial and transmural activation during LDVF. Dog hearts were isolated and ...
Yamada Takumi - - 2008
A 49-year-old woman with dextrocardia and situs inversus underwent catheter ablation of paroxysmal atrial fibrillation. A contrast injection into the left atrium revealed that the left atrial appendage (LAA) was adjacent to the right-sided (anatomic left) superior pulmonary vein (PV). After successful isolation of that PV, LAA potentials were recorded ...
De Sisti Antonio - - 2008
Limited information is available on the efficacy of cryoablation in the coronary venous system in humans. A patient with a lateral accessory pathway was referred to our center after several unsuccessful endocardial and epicardial (within the coronary sinus) attempts using standard radiofrequency energy. Ablation was subsequently performed successfully by applying ...
Lau Ernest W - - 2008
BACKGROUND: Guide catheters help deliver endocardial leads to specific locations within the heart, but their disengagement afterwards can be challenging. Slitting the catheter open over the lead may require the creation of an artificial platform to provide support for the blade and cause lead dislodgement through a sideways drag on ...
Hahurij Nathan D - - 2008
BACKGROUND: Fetal and neonatal atrioventricular (AV) reentrant tachycardias can be life-threatening but resolve in most cases during the first year of life. The transient presence of accessory AV myocardial connections during annulus fibrosus development may explain this phenomenon. METHODS AND RESULTS: A total of 45 human embryonic, fetal, and neonatal ...
Doppalapudi Harish - - 2008
Acute ischemia causes myriad changes including increased catecholamines. We tested the hypothesis that elevated catecholamines alone are arrhythmogenic. A 504 electrode sock was placed over both ventricles in six open-chest pigs. During control infusion of saline through a catheter in the left anterior descending coronary artery (LAD), no sustained arrhythmias ...
D'Avila Andre - - 2008
INTRODUCTION: Ablation of the mitral isthmus to achieve bidirectional conduction block is technically challenging, and incomplete block slows isthmus conduction and is often proarrhythmic. The presence of the blood pool in the coronary venous system may act as a heat-sink, thereby attenuating transmural RF lesion formation. This porcine study tested ...
Srivathsan Komandoor S - - 2008
BACKGROUND: Outflow tract ventricular tachycardia originating above the semilunar valves has been reported in a small number of studies. Discrete potentials in the great arteries (above the semilunar valves) have been rarely described in patients undergoing electrophysiology evaluation and radiofrequency ablation for ventricular arrhythmias. The mechanisms of these discrete potentials ...
Grace Andrew - - 2008
Cardiac arrhythmia management has advanced substantially and many patients are now being offered curative treatment. There is still much to do and therefore substantial research opportunities. Technical advances with better imaging and mapping datasets, improved ablation catheters and new devices to protect against SCD are all on the horizon. The ...
Patel Anshul M - - 2008
BACKGROUND: Atrial tachycardia (AT) that develops after ablation of atrial fibrillation often poses a more difficult clinical situation than the index arrhythmia. This study details the use of an impedance-based electroanatomic mapping system (Ensite NavX) in concert with a specialized multielectrode mapping catheter for rapid, high-density atrial mapping. In this ...
Yoshimachi Fuminobu - - 2008
BACKGROUND AND OBJECTIVES: Although the PercuSurge (PS) system is an efficient distal protection device, it has several limitations such as significant occlusion time causing myocardial ischemia and requirement of a large 7 or 8 Fr guiding catheter (GC). To address these problems, we developed a new method of use for ...
Mittal Suneet - - 2008
Catheter ablation has come to play an important therapeutic role in the management of some patients with ventricular arrhythmias. An important advance in catheter ablation of ventricular tachycardia (VT) has been the development of three-dimensional catheter-based mapping systems, which permit identification of the tachycardia circuit and facilitate a strategy for ...
Feld Gregory K - - 2008
BACKGROUND: Atrial flutter (AFL) is commonly treated by radiofrequency catheter ablation. Catheter-based cryoablation may be an effective alternative with potential advantages. OBJECTIVE: The purpose of this study was to study the acute and long-term safety and efficacy of catheter-based cryoablation for treatment of cavotricuspid isthmus-dependent (typical and reverse typical) AFL. ...
Aryana Arash - - 2008
Proarrhythmia is relatively common after extensive atrial ablation for atrial fibrillation, but has not been frequently documented after catheter ablation of ventricular tachycardia (VT). In theory, this phenomenon could occur if an incomplete ablation line is created between two nonconducting structures, such as dense scar or valvular annuli. This report ...
Efremidis Michalis - - 2008
Premature ventricular complex (PVC)-induced cardiomyopathy is an underappreciated cause of left-ventricular (LV) dysfunction. The present report describes the case of an elderly man with a very high burden of monomorphic PVCs and LV dysfunction. Elimination of the left ventricular focus following radiofrequency catheter ablation resulted in reversal of cardiomyopathy.
Kolditz Denise P - - 2008
BACKGROUND: The developmental mechanisms underlying the persistence of myocardial accessory atrioventricular pathways (APs) that bypass the annulus fibrosis are mainly unknown. In the present study, we investigated the role of epicardium-derived cells (EPDCs) in annulus fibrosis formation and the occurrence of APs. METHODS AND RESULTS: EPDC migration was mechanically inhibited ...
Jones Douglas L - - 2008
We previously published encircling endocardial cryo-isolation of the pulmonary vein (PV) region. This study documented mechanisms of isolation failure using CARTO mapping. Cryo-isolation used a modified Surgifrost introduced via a Universal Cardiac Introducer on the left atrial appendage. Of five pigs, two had incomplete isolation and repeat mapping: Activation was ...
Szili-Torok Tamas - - 2008
The improvement of surgical techniques resulted in significant life prolongation of many young patients with congenital heart disease (CHD). However, as these patients reach adulthood, their risk for late complications associated with surgery is also increased. One of the most difficult challenges associated with CHD is the high incidence of ...
Barbato Gaetano - - 2008
OBJECTIVE: Atrial transseptal puncture is nowadays routinely performed in the electrophysiology laboratory in order to map and ablate the left atrium. Some concerns, however, exist as to whether to perform atrial transseptal puncture in patients with heart valve prostheses, because of the risk of damaging the valve and of prosthetic ...
Zeppenfeld Katja - - 2008
Catheter ablation is an important therapeutic option for controlling recurrent ventricular arrhythmias in patients with heart disease. Although implantable defibrillators are generally first line therapy in this patient population, a substantial number of patients require additional therapy with either antiarrhythmic drugs, ablation, or both. Studies of mapping and ablation have ...
Yamada Takumi - - 2008
A 10-year-old boy with a supraventricular tachycardia was referred for catheter ablation. An electrophysiologic study revealed a left lateral concealed accessory pathway (AP). A few radiofrequency (RF) applications targeting the AP resulted in an inadvertent intra-atrial conduction block at the mitral isthmus without any damage to the AP. Adenosine was ...
Nadji G - - 2008
Transcatheter cryoablation is an alternative option for the treatment of supraventricular tachycardia, due to its very low risk of permanent atrio-ventricular block. However, the overcost of cryocatheter and the high recurrence rate of this emerging technology braked its large use. This study reports the results of an approach using cryoablation ...
Gami Apoor S - - 2008
Atrial tachycardias have been successfully ablated from the noncoronary cusp of the aortic valve. The anatomical substrate responsible for the arrhythmia in these patients is unknown. We report a case of intracardiac ultrasound confirmed ablation in the right coronary cusp of the aortic valve. Pacing maneuvers performed in this case, ...
Benussi Stefano - - 2008
OBJECTIVE: Despite its efficacy and swiftness, bipolar radiofrequency is generally not used on the left isthmus for concern of injuring a coronary branch. Incomplete lesion sets or use of an additional unipolar device are often considered. We report a technique to perform a full left lesion set involving the mitral ...
Saul J Philip - - 2008
Patients who have undergone repair of congenital heart disease are at risk for atrial and ventricular tachyarrhythmias and sudden death, both because of altered substrate for arrhythmias and an altered hemodynamic response. Despite an armamentarium of arrhythmia management tools, including drug therapy, antibradycardia, pacing, antitachycardia pacing, surgical ablation and catheter ...
Dipen Shah
Typical atrial flutter and atrial fibrillation are frequently observed to coexist(1) .&nbsp; In the current context of interventional electrophysiology, curative or at least definitive ablation is available for both arrhythmias. Despite their coexistence, it is not clear whether typical flutter ablation is necessary in all patients undergoing catheter ablation of ...
James C. Hansen
Case:&nbsp; A 64-year-old woman presented with palpitations.&nbsp; Her 24-hour Holter monitor revealed runs of presumed atrial fibrillation (AF).&nbsp; The patient was referred for EP study and AF ablation. EPS:&nbsp; At EPS, an anterograde A-H jump was noted.&nbsp; Spontaneous bursts of tachycardia were seen, consisting of sinus atrial beats with dual ...
Sanjay Dixit
Catheter based ablation has become a popular treatment strategy in the management of patients with atrial fibrillation (AF). Although patients undergoing AF ablation can expect success rates in excess of 80%, 1-3 the procedure is associated with a small risk of complications, the commonest of which is the development of ...
Hokimoto Seiji - - 2008
A 53-year-old man was admitted to our hospital for dyspnea, associated with atrial tachycardia. He underwent mitral valve replacement and Maze operation for mitral regurgitation and atrial fibrillation and since then he suffered from drug refractory atrial tachycardia followed by cardiogenic shock with systolic heart failure. Atrial tachycardia with rapid ...
Shan Qijun - - 2008
We report a 30 year old male without structural heart disease who presented with recurrent nocturnal syncope and aborted sudden cardiac death. 12-lead ECG showed elevated ST in inferior leads and short coupled premature ventricular complexes (PVCs). Propafenone challenge suggested a diagnosis of an atypical Brugada syndrome. Two morphological types ...
Roshan John - - 2008
Coronary sinus cannulation during an electrophysiology study can be quite challenging. This article describes a new technique that we use to cannulate the coronary sinus in cases where cannulation is not easy. The technique involves using a deflectable quadripolar catheter as a buddy to enable the decapolar catheter to slip ...
Chakravarthy Murali - - 2008
The intraaortic balloon pulsation (IABP) catheter is commonly used to treat left ventricular failure. The abnormality of the descending thoracic and abdominal aorta is considered as a relative contraindication for its insertion. We present here a patient with acute myocardial infarction with a post-infarct ventricular septal defect who presented with ...
Haghjoo Majid - - 2008
BACKGROUND: Prediction of accessory pathway (AP) location before radiofrequency ablation has become increasingly important for patients with AP; this is especially true for posteroseptal (PS) APs. OBJECTIVE: To identify electrocardiographic and electrophysiologic predictors of pathway location in patients with manifest posteroseptal AP. METHODS: A detailed electrocardiographic analysis, electrophysiologic study, and ...
Bonakdar Hamid Reza - - 2008
The coronary sinus activation pattern is an important clue for the detection of arrhythmia mechanisms and/or localization of accessory pathways. Any change in this pattern during radiofrequency ablation should be evaluated carefully to recognize the presence of another accessory pathway or innocence of the accessory pathway during arrhythmia. Intra-atrial conduction ...
Bhakta Deepak - - 2008
Electrophysiologic testing and radiofrequency ablation have evolved as curative measures for a variety of rhythm disturbances. As experience in this field has grown, ablation is progressively being used to address more complex rhythm disturbances. Paralleling this trend are technological advancements to facilitate these efforts, including electroanatomic mapping (EAM). At present, ...
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