Search Results
Results 251 - 300 of 1782
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Reddy Vivek Y - - 2009
BACKGROUND: Electric isolation of the pulmonary veins (PVs) can successfully treat patients with paroxysmal atrial fibrillation. However, it remains technically challenging to identify the left atrial-PV junction and sequentially position the ablation catheter in a point-by-point contiguous fashion to isolate the PVs. In this study, a novel endoscopic ablation system ...
Yamashina Yoshihiro - - 2009
BACKGROUND: There are few studies evaluating the distribution of successful ablation sites of idiopathic right ventricular outflow tract (RVOT) arrhythmias using a three-dimensional electroanatomical mapping system. This study aims to clarify the favorite site of idiopathic RVOT arrhythmias through electroanatomical voltage mapping using the CARTO system (Biosense Webster, Diamond Bar, ...
Tabatabaei Niloufar - - 2009
Supravalvar ablation has now been well documented to be the ideal mode for ablating specific forms of ventricular tachycardia, atrial tachycardia, and accessory pathways. A studied appreciation of the anatomy of the supravalvar region is a prerequisite for electrophysiologists to safely and effectively approach these arrhythmias. In addition, the consistent ...
Schwagten B K R - - 2009
Monomorphic ventricular tachycardia (VT) and symptomatic monomorphic PVCs originating from the region of the right and left outflow tracts are increasingly treated by radiofrequency (RF) catheter ablation. Technical difficulties in catheter manipulation to access these outflow tract areas, very accurate mapping and reliable catheter stability are key issues for a ...
Nakahara Shiro - - 2010
This case concerns a 57-year-old woman with an organized left atrial tachycardia (AT) after pulmonary vein (PV) isolation. The left inferior PV (LIPV) exhibited a figure of eight tachycardia around the LIPV ostium with one loop at the anterior aspect and another at the posterior aspect, which corresponded to regular ...
Yamada Takumi - - 2009
A 74-year-old man with symptomatic premature ventricular contractions (PVCs) with a right bundle branch block and right inferior axis QRS morphology underwent electrophysiologic testing. During the PVCs, coronary sinus mapping revealed ventricular prepotentials with the earliest activation in the distal great cardiac vein (GCV) where the local ventricular electrograms were ...
Saltman Adam E - - 2009
Atrial fibrillation is a pervasive and difficult heart rhythm problem for more than 3 million Americans. Patients are plagued by myriad symptoms and are exposed to the risk of stroke. Attempts to restore normal rhythm with drug therapy have been largely unsuccessful and the complications associated with long-term anticoagulation to ...
Saravanan Palaniappan - - 2009
There is increasing recognition that migraine with aura may be associated with intra-cardiac shunting because of a patent foramen ovale. Radio-frequency ablation to treat cardiac arrhythmias is an increasingly popular means of treating cardiac arrhythmias. Trans-septal puncture is routinely performed to gain access to the left atrium in order to ...
Yamada Takumi - - 2009
A 73-year-old man with idiopathic premature ventricular contractions (PVCs) underwent electrophysiological testing. Left ventricular activation mapping revealed a focal mechanism of the PVCs with the earliest activation on the anterior papillary muscle (APM). Irrigated radiofrequency (RF) current delivered at that site induced a cluster of non-sustained ventricular tachycardia episodes with ...
Suh William M - - 2009
Sudden cardiac death from ventricular fibrillation (VF) typically occurs in patients with structural heart disease, but in 5 to 10 percent VF is "idiopathic," occurring in normal hearts. Recently, there has been the description and growing recognition of patients with VF that has a focal origin, the common sites being ...
Cabrera José Angel - - 2009
BACKGROUND: Electrophysiological studies in patients with atrial fibrillation demonstrated the presence of electrical conduction between superior and inferior left pulmonary veins (PVs) that makes electrical disconnection of individual PVs difficult. Anatomically, the prevalence, sizes, and locations of the interpulmonary connections have not been investigated systematically. METHODS: We retrieved 112 PVs ...
Latcu Decebal G - - 2009
Magnetic navigation system (MNS) (Niobe, Stereotaxis, Saint-Louis, Missouri, USA) allows remote control of a radiofrequency ablation catheter using a steerable magnetic field and a catheter advancement system. We report our initial experience of ablation of human arrhythmias using the MNS. Eighty-four patients (mean age 54+/-17years; 39 women) had an electrophysiologic ...
Maury Philippe - - 2009
We report the case of a patient presenting with incessant monomorphic ventricular tachycardia resistant to antiarrhythmic drugs, and in whom usual percutaneous vascular or pericardial access to the left ventricle was hindered by mechanical aortic and mitral prosthetic valves. Because an epicardial location was suspected by electrocardiogram features and because ...
Hiramatsu Shigeki - - 2009
BACKGROUND: Some supraventricular tachycardias could be ablated from the non-coronary sinus of Valsalva (NSV). However, the characteristics of the NSV electrograms have not been clarified. METHODS AND RESULTS: A quantitative analysis of the NSV electrograms was performed in 5 patients with tachycardias arising from near the atrioventricular node (AVN) and ...
Kurek Christian - - 2009
Catheter ablation is an established treatment modality for patients with drug refractory atrial fibrillation (AF). This procedure carries a 6% major complication rate including cardiac tamponade due to cardiac perforation. We report on a patient with clinical signs of cardiac tamponade due to a diffuse intramural left atrial haematoma obstructing ...
Ducceschi Valentino - - 2009
We reported a patient who underwent RF ablation of the distal insertion of an atrio-fascicular accessory pathway with decremental properties because of inability to map a suitable potential alongside the tricuspid annulus. Small, discrete potentials resembling those of purkinje fiber were found at right ventricular apex, all these potentials showed ...
Ancona Roberta - - 2009
We report a case of an asymptomatic patient in whom a right atrial mass was fortuitously documented by echocardiography few months after a transcatheter radiofrequency catheter ablation for recurrent AF. No masses were seen in the cardiac chambers before the ablative procedure, raising important diagnostic and decision-making issues. The patient ...
Yamada Takumi - - 2009
INTRODUCTION: Focal ventricular arrhythmias (VAs) have been reported to arise from the posterior papillary muscle in the left ventricle (LV). We report a distinct subgroup of idiopathic VAs arising from the anterior papillary muscle (APM) in the LV. METHODS AND RESULTS: We studied 432 consecutive patients undergoing catheter ablation for ...
Koa-Wing Michael - - 2009
Robotically assisted catheter ablation has been proven feasible in patients with a variety of atrial arrhythmias. The potential to provide improved catheter tip maneuvering and stability potentially makes it ideal for complex ablation procedures. We present the case of a patient with complex congenital heart disease with previous Rastelli repair ...
Schneider Heike E - - 2009
BACKGROUND: Several case reports have documented coronary artery stenosis or even occlusion after radiofrequency energy ablation (RFA) in children and adults. Coronary involvement early and late after RFA has also been described in animal models. OBJECTIVE: The purpose of this study was to assess prospectively the incidence of coronary artery ...
Desjardins Benoit - - 2009
BACKGROUND: Delayed enhanced magnetic resonance imaging (DE-MRI) can be used for the exact assessment of myocardial infarct scar. Electroanatomic (EA) mapping can identify the subendocardial extension of infarcts and is used to identify and eliminate areas critical for postinfarction ventricular arrhythmias. OBJECTIVES: The purpose of this study was to correlate ...
Miller John M - - 2009
Despite the increasing number of sophisticated, computerized tools available to the practicing electrophysiologist for facilitating catheter ablation of ventricular tachycardia, the procedure is often quite challenging. Use of these tools needs to be kept in perspective, subservient to the judgment of the physician. This review explores a series of principles ...
Ho Siew Yen - - 2009
Safe maneuvering of catheters in and around the ventricles, and ablations for ventricular tachycardia, require knowledge of the anatomy of the cardiac and extracardiac structures. This review emphasises the three-dimensional spatial relationships between the right and left ventricles and highlights the important extracardiac structures in the vicinity of the ventricles. ...
Christ Günter - - 2009
Chronic total occlusions (CTO) still remain one of the most technically challenging fields in interventional cardiology. Here we report a case of successful retrograde recanalization of an occluded proximal left anterior descending coronary artery with a modification of the "retrograde proximal true lumen puncture" technique. By combining this strategy with ...
Hisada Tetsuya - - 2009
INTRODUCTION: Cardiovascular diseases can cause sudden incapacitation in aircrew. Cardiological diagnosis and therapy have changed a great deal in recent decades, as with coronary revascularization, including percutaneous coronary intervention and coronary artery bypass grafting for coronary artery disease, and electrophysiological studies and radiofrequency catheter ablation (RFCA) for sustained arrhythmias. Physicians ...
Sumitomo Naokata - - 2009
INTRODUCTION: This is a rare case of antidromic reciprocating tachycardia developing 8 years after successful catheter ablation. RESULT: A 15-year-old girl had recurrence of palpitations 8 years after the ablation of manifest right posteroseptal accessory pathway. Atrial burst pacing revealed Wenckebach atrioventricular conduction with preexcitation. Wide QRS tachycardia with identical ...
Solheim Eivind - - 2009
A 15-year-old boy who had been given an orthotopic heart transplant 12 years earlier underwent radiofrequency ablation after 14 months of tachycardia. At the time of the procedure, the patient presented moderate signs of heart failure and tachycardia-induced cardiomyopathy. During electroanatomical mapping we identified a focal atrial tachycardia with origin ...
Takahashi Atsushi - - 2009
Radiofrequency catheter ablation is widely performed as an effective treatment for recurrent, drug-resistant atrial fibrillation (AF). Recently, various types of ablation strategies, such as extensive encircling pulmonary vein (PV) isolation, linear ablation and complex fractionated electrogram-guided ablation, have been used to achieve a high efficacy for all types of AF. ...
James C. Hansen
Case: A 62-year-old woman was referred for atrial fibrillation (AF) ablation. She had permanent AF for 8 years since mechanical mitral valve replacement for rheumatic heart disease. EPS: A strategy of substrate-based ablation targeting areas of complex fractionated atrial electrograms (CFAE) was pursued. These sites were identified by inspection of ...
Hong Jinback - - 2009
Thermal-based ablation for the treatment of arrhythmias is known to cause issues (e.g. heat loss due to blood perfusion, mechanical damage of the tissue from excessive heat, etc.) that hamper the success of the treatment. A novel technique termed "electroporation" is a process that leads to pore formation in cell ...
Smerup Morten - - 2009
Although myocardial architecture has been investigated extensively, as yet no evidence exists for the anatomic segregation of discrete myocardial pathways. We performed post-mortem diffusion tensor imaging on 14 pig hearts. Pathway tracking was done from 22 standardized voxel groups from within the left ventricle, the left ventricular papillary muscles, and ...
Wright Matthew - - 2009
PURPOSE OF REVIEW: Ventricular fibrillation is a challenging arrhythmia for physicians, with only a limited number of treatment options available. Implantable cardioverter defibrillator therapy is the treatment of choice for patients for both primary and secondary prevention with the role of antiarrhythmic therapy aimed at reducing the number of recurrences. ...
Badger Troy J - - 2009
Catheter ablation of atrial fibrillation has emerged as a viable therapeutic option for those patients who have failed conventional medical therapy. This treatment strategy has been introduced in the past decade following the discovery of ectopic foci in the pulmonary veins capable of initiating this arrhythmia. The basis of current ...
Arshad Sadia - - 2009
A previously healthy middle-aged lady with no prior risk factors for coronary artery disease presented with chest discomfort and ECG changes suggestive of anterolateral ST elevation myocardial infarction. She had had a stressful event prior to the onset of symptoms in that she had been caught up in a riot ...
Osman Faizel - - 2009
It was long believed that Mahaim pathways represented nodo-fascicular or nodo-ventricular connections. However, this misconception was challenged when patients underwent surgical or catheter ablation of the AV node but remained pre-excited. Electrophysiology (EP) studies showed these pathways to be right sided decrementally conducting atrio-fascicular accessory pathways with the atrium forming ...
Bohora Shomu - - 2009
Mahaim fiber exhibits atrio-ventricular node like properties and generally is localized at the lateral aspect of the tricuspid annulus. Of the varying methods for localization, ablation at the site of Mahaim potential is the most accepted and successful method. Radiofrequency ablation of Mahaim fiber has high success rates.
Ducceschi Valentino - - 2009
We report a patient who underwent radiofrequency ablation of the distal insertion of an atrio-fascicular accessory pathway with decremental properties because of inability to map a suitable potential alongside the tricuspid annulus. Small, discrete potentials resembling those of Purkinje fiber were found at right ventricular apex. All these potentials showed ...
Turakhia Mintu P - - 2009
A 31-year old male presented with atrial fibrillation and ventricular preexcitation that was positive in leads V1-V4, negative in lead II, and positive in lead AVR. The patient was cardioverted and invasive electrophysiologic study was performed. Based on the ECG findings, the coronary sinus and its branches were interrogated during ...
Yadav Rakesh - - 2009
Total upper body drainage via left superior vena cava into coronary sinus (i.e. absent right superior vena cava) is a rare anomaly and distorts the anatomy of coronary sinus and triangle of Koch. Herewith we are reporting the first report of ablation in a patient with superior vena cava draining ...
Herlihy James P - - 2009
We describe the initial--and successful--use of the TandemHeart System's catheters to provide extracorporeal membrane oxygenation (ECMO), in 2 patients. In 1 patient, who was experiencing severe primary respiratory failure, the catheters provided a standard venovenous ECMO circuit. In the other patient, who had severe, acute pulmonary hypertension and right-heart failure, ...
Andrikopoulos George - - 2009
Radiofrequency catheter ablation has become an established treatment option for the management of patients with atrial fibrillation (AF). Although the concept of a rhythm control strategy devoid of the adverse events related to antiarrhythmic treatment seems highly attractive, further steps are needed in order to improve our understanding of the ...
Bode Kerstin - - 2008
BACKGROUND AND OBJECTIVES: Monomorphic ventricular premature beats (VPB) originating from the Purkinje network can induce polymorphic ventricular tachycardia (PMVT) and ventricular fibrillation (VF) storm. We hereby report the results of targeted ablation to treat PMVT/VF storms initiated by monomorphic VPB in seven patients with structural heart disease and left ventricular ...
Klein G - - 2008
Catheter-based ablation has been adopted as second-line therapy for both paroxysmal and persistent atrial fibrillation (AF) and is currently investigated as a primary approach. Reported success rates of catheter-based radiofrequency (RF) ablation vary between 65% and 85% depending on the technique used, patient selection and experience of the center. However, ...
Lickfett L - - 2008
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia with a prevalence in the general population of approximately 1%. Catheter ablation has emerged from being a highly experimental procedure to one of the most common ablation performed in many electrophysiology laboratories throughout the world. The stability of sinus rhythm ...
Zheng Lihui - - 2009
INTRODUCTION: This study attempted to delineate the mechanism of organized left atrial tachyarrhythmia (AT) during stepwise linear ablation for atrial fibrillation (AF) using noncontact mapping. METHODS AND RESULTS: Eighty patients in whom organized ATs developed or induced during stepwise linear ablation for AF were enrolled. Left atrial (LA) activation during ...
Iwasaku Toshihiro - - 2009
A 55-year-old man was admitted to our hospital for further examination of the abnormalities of chest X-ray and electrocardiogram. He was diagnosed with type B Wolff-Parkinson-White syndrome concomitant with dilated cardiomyopathy. Despite the medical therapy using enalapril and carvedilol for 20 months, his cardiac performance and brain natriuretic peptide (BNP) ...
Brace Christopher L - - 2009
PURPOSE: To compare radiofrequency (RF) ablations created by using a sequential technique to those created simultaneously by using a switching algorithm in ex vivo and in vivo liver models. MATERIALS AND METHODS: RF ablation was performed by using either sequential or switched application of three cooled electrodes in a 2-cm ...
Tiroch Klaus - - 2008
BACKGROUND: Recanalization of coronary chronic total occlusions (CTOs) remains a clinical challenge, particularly when standard guidewire attempts fail. OBJECTIVES: We sought to determine the safety and efficacy of a novel method that used high-frequency (20 kHz) vibration to fragment occlusive fibrous tissue and facilitate guidewire crossing into the distal vessel. ...
Miyagi Yasuo - - 2009
BACKGROUND: The transmurality of the ablation lesions created on a beating heart has not been examined histologically or electrophysiologically. This study aimed to assess the feasibility of an atrial epicardial or endocardial ablation in an off-pump setting using unipolar radiofrequency (RF) energy. METHODS: A linear ablation lesion of 5 cm ...
Clendenen S R - - 2008
BACKGROUND: The current means of introducing continuous sciatic catheters include nerve stimulation, with or without catheter stimulation techniques. More recently, ultrasound has been utilized to facilitate catheter placement. METHODS: This case represents a stimulating catheter-guided continuous block facilitated by three-dimensional ultrasound, which revealed aberrant anatomy with proximal and wide bifurcation ...
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