Search Results
Results 701 - 750 of 1782
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Semizel Evren - - 2003
The permanent form of junctional reciprocating tachycardia (PJRT) is usually refractory to drug therapy, and these patients are at risk of developing tachycardia-induced cardiomyopathy. The electrocardiogram insribes inverted P waves in leads 2, 3, aVF as well as left lateral leads, along with a P-R interval shorter than R-P interval ...
Fenelon Guilherme - - 2003
Mapping and Ablation of Atrial Tachycardia in Heart Failure. INTRODUCTION: Dogs with rapid ventricular pacing-induced congestive heart failure (CHF) have inducible atrial tachycardia (AT), with a mechanism consistent with delayed afterdepolarization-mediated triggered activity. We assessed the hypothesis that AT has a focal origin. METHODS AND RESULTS: Twenty-one CHF dogs undergoing ...
Delacretaz Etienne - - 2003
Methods for determining if an ablation lesion has been created by RF current application are limited, but needed. This study sought to determine if a change in pacing threshold at the ablation site might be used to assess creation of an ablation lesion. Peak-to-peak amplitude of the bipolar electrogram (EGM) ...
Langenberg Chris J M - - 2003
STUDY OBJECTIVES: To evaluate the placement and complications of a coronary sinus (CS) catheter in human subjects. DESIGN: Sixty-two CS catheters inserted in patients scheduled for coronary artery bypass graft surgery (CABG). SETTING: University hospital, anesthesia and cardiothoracic surgery departments. PATIENTS: Sixty-two patients without valvular or concomitant diseases undergoing CABG. ...
de Groot Natasja M S - - 2003
BACKGROUND: Endocardial mapping is mandatory before radiofrequency catheter ablation (RFCA). Mapping can be performed with either unipolar or bipolar recordings. Impact of the recording technique used was studied in patients with and without structural heart disease using the 3D electroanatomic CARTO mapping system. METHODS AND RESULTS: Patients (n=44; 16 males; ...
Ng William - - 2003
The Safe-Cross wire system, which has optical coherence reflectometry technology for navigating and radiofrequency energy provided at its tip for crossing chronic total occlusions (CTOs), provides a promising means to treat hard, organized CTOs. Using this system, we report on a 60% success rate in patients who had long-standing coronary ...
Oral Hakan - - 2003
Accurate identification of pulmonary vein (PV) potentials during segmental ostial ablation for PV isolation is very important to completely isolate the PVs and also to avoid unnecessary applications of radiofrequency energy. A prior post hoc analysis of unipolar and bipolar electrograms recorded from successful and unsuccessful ablation sites demonstrated that ...
Kandzari David E - - 2003
Despite recent advances in catheter-based technologies for peripheral arterial revascularization, adequate guide catheter positioning and support remains a leading procedural challenge. This report describes the adaptation of the Behar Internal Mammary VB-1 catheter for peripheral revascularization procedures in patients with complex anatomy not amendable to other conventional peripheral guide catheters.
Tung Stanley - - 2003
OBJECTIVES: The goal of this study was to assess entrainment for distinguishing far-field potentials (FFP) due to depolarization of tissue at a distance from the mapping catheter from the local potential (LP) due to depolarization of tissue at the catheter electrode during mapping of ventricular tachycardia (VT). BACKGROUND: Electrograms with ...
Ooie Tatsuhiko - - 2003
INTRODUCTION: The aim of this study was to examine the location of anterograde and retrograde slow pathways in 16 patients with uncommon atrioventricular nodal reentrant tachycardia (AVNRT), including the fast-slow form in 10, slow-slow form in 5, and both fast-slow and slow-slow forms in 1. METHODS AND RESULTS: Patients were ...
Singh Balbir - - 2003
Coronary sinus electrograms generally represent the sequence of left atrial activation, and are very helpful in localizing and differentiating left lateral accessory pathway-mediated tachycardia from other supraventricular tachycardias. The activation of the coronary sinus from the left atrium occurs through muscle bridges, which may be discrete or form an intermingled ...
Ash Stephen R - - 2003
The success of chronic peritoneal dialysis (PD) depends to a large extent on the success of the chronic PD access device. For the nephrologist placing and removing PD catheters, or for the nephrologist advising surgeons in this role, this article provides a review of designs of PD catheters and differences ...
Manasse Eric - - 2003
We present a case of left main coronary arterial lesion in a 62-year-old man who had undergone mitral valve replacement and microwave epicardial ablation. On postoperative day 90, the patient had an anterior myocardial infarction. The coronary angiography displayed the diagnosis of the left main trunk lesion. A myocardial revascularization ...
Takami Mitsuaki - - 2003
OBJECTIVES: This study assessed the time course of resolution of left atrial appendage (LAA) stunning after catheter ablation of chronic atrial flutter (AFL). BACKGROUND: Although the presence of LAA stunning after ablation of chronic AFL calls for anticoagulation in the post-cardioversion period, limited information has been obtained, particularly regarding its ...
Reddy Vivek Y - - 2003
BACKGROUND: Substrate mapping of post-myocardial infarction ventricular tachycardia involves electroanatomic delineation of scarred tissue on the basis of electrogram characteristics during sinus rhythm. A percutaneous transthoracic technique was recently described that allows catheter mapping of the epicardial surface of the heart. This study sought to determine whether the epicardial extent ...
Reithmann Christopher - - 2003
Arrhythmogenic right ventricular dysplasia is a structural heart disease characterized by fibrofatty degeneration of right ventricular myocardium and arrhythmias of right ventricular origin. The aim of this study was to characterize endocardial right ventricular activation by electroanatomic mapping as a guide for catheter ablation in patients with arrhythmogenic right ventricular ...
Ribbing Michael - - 2003
INTRODUCTION: Activation mapping and pace mapping identify successful ablation sites for catheter ablation of right ventricular outflow tract (RVOT) tachycardia. These methods are limited in patients with nonsustained tachycardia or isolated ventricular ectopic beats. We investigated the feasibility of using noncontact mapping to guide the ablation of RVOT arrhythmias. METHODS ...
Willems Stephan - - 2003
The present study sought to investigate the electrophysiological properties of isolated pulmonary veins following successful radiofrequency (RF) catheter ablation in patients with paroxysmal atrial fibrillation (PAF). Overall, 71 pulmonary veins in 37 consecutive patients (age: 56 +/- 9 years) with recurrent PAF were targeted for RF ablation at the ostial ...
Starck C - - 2003
Starting in November 1999, we performed a left atrial radiofrequency ablation procedure concomitantly to a variety of cardiac surgical procedures. By January 2001, this ablation procedure had been performed on 100 patients (age 65.7 +/- 10.4 years, 53 % male, 47 % female, left atrium 51.0 +/- 7.5 mm) suffering ...
Benussi Stefano - - 2003
Atrial fibrillation ablation surgery has grown very popular in recent years. Modern techniques involve creation of linear scars on the left atrial wall using different ablation devices. That raises the concern about new major surgical complications that can be caused by the ablation procedure. Postablation coronary obstruction and esophageal injury ...
Földesi Csaba - - 2003
The term atrial flutter was introduced 90 years ago for an arrhythmia with a unique electrocardiographic pattern. The development of endocardial mapping techniques in the last decade allowed the detailed characterization of the tachycardia circuit and the identification of the cavotricuspid isthmus as its critical part. This review stresses the ...
Chiou Chuen-Wang - - 2003
BACKGROUND: The aim of this study was to test the electrophysiological effects of continuous enhanced vagal tone on dual atrioventricular (AV) nodal and accessory pathways. METHODS AND RESULTS: This study included 10 patients with typical, slow-fast AV nodal reentrant tachycardia (AVNRT) and 10 patients with AV reciprocating tachycardia. Electrophysiological data ...
Engelstein Erica D - - 2003
Sudden cardiac death is responsible for >40% of patients with heart failure losing their lives. Thus, the prevention of life-threatening cardiac arrhythmias is a major goal in the management of heart failure. In several randomized clinical trials, electrical therapy with the implantable cardioverter defibrillator (ICD) has proved superior to medical ...
Weinbroum Avi A - - 2003
The efficacy and safety of flumazenil in reversing midazolam-induced paradoxical reaction in a child suffering from paroxysmal supraventricular tachycardia (PSVT) and undergoing radiofrequency ablation procedure has not been described before. We report a boy who had suffered for years from poorly controlled PSVT because of noncompliance to medications and was ...
Schmieder Sebastian - - 2003
AIMS: The purpose of this study was to evaluate the acute success rate and long-term efficacy of radiofrequency ablation of common type atrial flutter (AFL) by using a standardised anatomical approach in a large series of patients and to assess the influence of right atrial isthmus ablation on the occurrence ...
Okishige Kaoru - - 2003
Three-dimensional visualization of cardiac activation has become important for providing further insights into the pathophysiological mechanisms of arrhythmias and to increase the efficacy of catheter ablation. The noncontact mapping system enables a single-beat analysis of the reconstructed geometry of the cardiac chamber. In 8 patients with various kinds of arrhythmias ...
Krittayaphong Rungroj - - 2003
From January 1996 to May 2002, 61 patients with ventricular tachycardia from right ventricular outflow tract were referred to Siriraj hospital. All patients underwent clinical examination, Doppler echocardiography and electrophysiologic study. Mapping of ventricular tachycardia was performed by activation mapping and pacemapping. There were 44 females and 17 males with ...
Wrobleski David - - 2003
INTRODUCTION: Substrate-based catheter ablation of postmyocardial infarction (post-MI) ventricular tachycardia necessitates electroanatomic definition of the scarred endocardium. We sought to determine whether electrogram criteria during sinus rhythm could identify the location and extent of the myocardial scar by electroanatomic mapping. METHODS AND RESULTS: A porcine model of healed MI was ...
Raungratanaamporn Ongkarn O Bangkok Heart Institute, Bangkok Hospital, Bangkok 10320, - - 2003
Radiofrequency catheter ablation (RFCA) is the first-line therapy for various tachyarrhythmias. The authors reports experience of RFCA for various types of tachyarrhythmia in 80 consecutive patients, 85 tracts of ablation, from May 2001 to October 2002. The mean age was 40 years, range 6-81 years. Seventy four and 13 tracts ...
Tsai Jang-Zern - - 2003
Due to rapid change of fiber orientation, it is difficult to measure myocardial impedivity separately in a longitudinal or transverse fiber direction without mutual influence in the two directions. Previously published values of the longitudinal and the transverse myocardial impedivity were derived indirectly from measurements that mixed the impedivity in ...
Hussin Azlan - - 2003
We report the case of an accessory pathway in a left inferoposterior diverticulum. The pathway masqueraded as a true left lateral pathway due to the direction of activation over a coronary sinus to left atrium connection. The patient had undergone four prior failed ablation attempts at other institutions using both ...
D'Avila Andre - - 2003
Investigators are beginning to exploit the pericardial space for a number of cardiovascular applications, including catheter ablation of cardiac arrhythmias, cardiovascular drug therapy, and cardiac pacing. This review explores the anatomy of the pericardial space and the anatomic variants that may be encountered in this novel approach to the heart.
Liu Quan-Da - - 2003
AIM: To assess the feasibility and safety of radiofrequency ablation (RFA) in treatment of secondary splenomagely and hypersplenism. METHODS: Sixteen healthy mongrel dogs were randomly divided into two groups, group I (n=4) and group II (n=12). Congestive splenomegaly was induced by ligation of splenic vein and its collateral branches in ...
Kirchhof Paulus - - 2003
We report a patient with incessant, exercise-limiting supraventricular tachycardia on the ventricular level and a constant 1:2 atrioventricular relation. Careful mapping of the AV nodal region revealed His alternans in the inferior AV nodal area and nonalternating His morphologies in the superior His region. Radiofrequency catheter ablation in the inferior ...
Szili-Torok T - - 2003
AIMS: Fluoroscopy does not allow identification specific anatomical landmarks during electrophysiological studies. Intra-cardiac echocardiography permits visualization of these structures with excellent accuracy, but the optimal method has not been fully described. The aim of this study was to assess the capability of intra-cardiac echocardiography for the visualization of such structures ...
Colangelo Nicola - - 2003
In recent years, the popularity of simplified intraoperative ablation approaches to treat atrial fibrillation (AF) has been progressively increasing. Our group has described a left atrial procedure based on epicardial radio frequency ablation on cardiopulmonary bypass (CPB). We report our CPB and myocardial protection strategy in 157 patients who underwent ...
Jazbinsek V - - 2003
Investigations were carried out into whether an equivalent generator consisting of two dipoles could be used to detect dual sites of ventricular activity. A computer model of the human ventricular myocardium was used to simulate activation sequences initiated at eight different pairs of sites positioned on the epicardial surface of ...
Kammeraad Janneke A E - - 2003
Nonautomatic focal atrial tachycardia (NAFAT) is a rare and poorly understood arrhythmia either due to microreentry or triggered mechanism. NAFAT was defined as a focal atrial tachycardia which was inducible with pacing maneuvers in the electrophysiology lab. We reviewed the charts and EP study reports of all 38 patients with ...
Arita Noboru - - 2003
Fluoroscopy (FS)- or transesophageal echocardiography (TEE)-guided heartworm removal was carried out using flexible alligator forceps to compare the rate of worm removal. As a result, the worm removal rates were similar between the two procedures. However, the TEE-guided procedure does not involve radiation exposure, and facilitates observation of worms in ...
Matsumoto Naoki - - 2003
Experimental in vitro and in vivo studies were performed to assess the effectiveness and safety of the cooled-tip catheter and the Cooled Ablation System, which enables the creation of deeper and wider burn lesions in the myocardial tissue using radiofrequency current. This system was confirmed to consistently create large burns ...
Bazaz Raveen - - 2003
Atrial transseptal puncture is a technique that provides pervenous access to the left heart. The aim of this technique is to provide catheter access to the left atrium and ventricle for mapping, as well as stable electrode-endocardial contact for ablation energy application. In the present report, "site-selective" atrial septal puncture ...
Mandapati Ravi - - 2003
INTRODUCTION: Intra-atrial reentrant tachycardia (IART) is a frequent late sequel of congenital heart surgery, often involving the cavotricuspid isthmus. In this report, we characterize pericaval reentry, a novel mechanism of isthmus-dependent IART in congenital heart patients, and compare its electrophysiologic characteristics with periannular atrial flutter. METHODS AND RESULTS: Electrophysiologic and ...
Simon Ron D B - - 2003
INTRODUCTION: We report three cases of transient, reversible coronary ischemia occurring after radiofrequency ablation in the left atrium. METHODS AND RESULTS: A 56-year-old man with a left atrial tachycardia that was mapped to the septum and roof of the atrium using a noncontact mapping developed 5-mm ST elevation in the ...
Gonzalez y Gonzalez M B - - 2003
BACKGROUND: Idiopathic repetitive monomorphic ventricular tachycardia with an inferior axis and left bundle branch block pattern typically originates from the superior right ventricular outflow tract. When indicated, radiofrequency catheter ablation is usually safe and effective. However, a left ventricular origin has been described recently in adult patients in whom ablation ...
Mazgalev T N - - 2003
Although we soon will be marking the 100th anniversary of the discovery of the atrioventricular (AV) node, the mysteries of this most complex of all parts of the conduction system of the heart remain. We are still battling controversies related to the precise morphology of the AV node and its ...
Solomon Stephen B - - 2003
INTRODUCTION: Targets for ablation of atrial fibrillation, atrial flutter, and non-idiopathic ventricular tachycardia are increasingly being selected based on anatomic considerations. Because fluoroscopy provides only limited information about the relationship between catheter positions and cardiac structures, and is associated with radiation risk, other approaches to mapping may be beneficial. METHODS: ...
Oesterle Stephen N - - 2003
Catheter-based coronary bypass has evolved since its origin in 1995. We present a status update of one version of catheter-based bypass, percutaneous in situ coronary venous arterialization (PICVA), its successes and failures, and the many questions and challenges that remain. Initial clinical experience with PICVA demonstrated promising mitigation of angina ...
Sanchez Javier E - - 2003
BACKGROUND: Determining whether a linear catheter radio frequency (RF) ablation lesion is transmural may be difficult, especially during atrial fibrillation. We hypothesized that changes in pacing thresholds and electrogram amplitude during atrial fibrillation and sinus rhythm could be used to assess whether a radiofrequency ablation resulted in transmural necrosis. METHODS: ...
Peichl Petr - - 2003
Scar tissue after surgical procedures for congenital heart disease may create a complex arrhythmogenic substrate and expose patients to the risk of "incisional" tachycardia. We report the usefulness of electroanatomical mapping in the characterization of reentrant circuits and identification of sites of successful radiofrequency (RF) ablation. METHODS: Electroanatomical mapping was ...
Takeda Akira - - 2003
For percutaneous radiofrequency ablation of osteoid osteoma for pain management, we used a standard electrosurgical generator instead of the radiofrequency generator system. First, we used the standard electrosurgical generator to determine the diameter of the coagulated area of normal femurs and humeruses of dogs under general anesthesia and to detect ...
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