Search Results
Results 501 - 550 of 1767
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De Ponti Roberto - - 2006
OBJECTIVES: We report the data from the Italian Survey on trans-septal catheterization (TSP-C) for catheter ablation of arrhythmias in the left heart that covered 2003 and previous years. BACKGROUND: Over the last decade the use of TSP-C in the electrophysiology laboratory has greatly increased. Recent data on number of procedures, ...
Daoud Emile G - - 2006
BACKGROUND: After circumferential ablation for atrial fibrillation, new onset left atrial flutter (LA Flr) may occur. This study assessed the relationship between induced and clinical episodes of LA Flr, the rate of spontaneous resolution of LA Flr, and the proarrhythmic effect of circumferential ablation. METHODS AND RESULTS: A total 112 ...
Luik Armin - - 2006
BACKGROUND: Atresia of the coronary sinus (CS) ostium with retrograde drainage of the cardiac veins via the persistent left superior vena cava (PLSVC) is a rare abnormality and only a few case reports in association with electrophysiological studies have been reported. METHODS: During standard electrophysiological study in three patients with ...
Hall M C S - - 2006
The specialist management of arrhythmias has changed significantly over the past decade. This article outlines current management strategies for atrial flutter and atrial fibrillation, with particular emphasis on curative strategies with catheter ablation and the recent data on rhythm compared with rate control strategies. The expanding role of catheter ablation ...
Risius Tim - - 2006
AIMS: Paroxysmal atrial fibrillation (PAF) is predominantly triggered by focal ectopies located within the pulmonary veins (PV). The BITMAP Study (Breakthrough and Isolation Trial: Mapping and Ablation of Pulmonary Veins) investigated prospectively the safety and efficacy of a catheter design with circumferential mapping and ablation electrodes. We report the phenomenon ...
Li Yushu - - 2006
INTRODUCTION: Paroxysmal Supraventricular Tachycardia (PSVT) resulting from any cause can at times lead to diagnostic difficulty mainly when due to AVNRT and AVRT. In this study we used a non-invasive approach using esophageal ECG (ECGe) and ECG derived from the various right parasternal chest leads (RPCL) to correctly diagnose the ...
Aunes-Jansson Maria - - 2006
BACKGROUND: Cardiac memory, electrophysiological remodeling induced by periods of altered ventricular activation, has been observed after resumption of normal activation following ablation of overt accessory pathways. We studied the occurrence and temporal characteristics of cardiac memory (inferior T wave inversions) after ablation of overt posteroseptal accessory pathways. METHODS: T wave ...
Ryder Marcia - - 2006
Catheter-related bloodstream infection and catheter occlusion are potential significant complications of parenteral nutrition therapy. The increased incidence and associated morbidity, mortality, increased costs, and quality-of-life issues experienced with these adverse events necessitate specialized management of vascular access devices. The host coagulation response to biomaterials and the associated development of biofilm ...
Tada Hiroshi - - 2006
We describe a patient who underwent radiofrequency (RF) catheter ablation of symptomatic atrial fibrillation. After left atrial (LA) catheter ablation and pulmonary vein isolation, a macro-reentrant atrial tachycardia (AT) with a critical isthmus at the mitral isthmus was induced by incremental atrial pacing from the coronary sinus. Extensive RF energy ...
Laurent Gabriel - - 2006
AIMS: Cavo-tricuspid isthmus (CTI) radiofrequency (RF) ablation is a curative therapy for common atrial flutter (AFl), but is associated with a recurrence rate of 5-26%. Although complete bidirectional conduction block is usually achieved, the recurrence of AF is due to recovered conducting isthmus tissue through which activation wavefronts pass. We ...
Kovoor Pramesh - - 2006
INTRODUCTION: Reentrant circuits causing ventricular tachycardia are closely associated with previously scarred myocardium. The presence of scar has been blamed for the poor success rate of radiofrequency ablation (RFA) in that context. This article investigates the in vivo effects of radiofrequency ablation in myocardium scarred from acute myocardial infarction. METHODS ...
Deneke Thomas - - 2006
Ablation of Atrial Tachycardia after Antiatrial Fibrillation Surgery. INTRODUCTION: Surgical treatment of atrial fibrillation (AF) is gaining widespread acceptance. However, therapeutic modalities for secondary regular atrial tachycardia are still empiric. METHODS AND RESULTS: After linear atrial cooled-tip radiofrequency ablation (SICTRA) during cardio-surgical procedures to cure permanent AF, patients with regular ...
Yilmaz Bülent - - 2006
Catheter-based epicardial mapping is possible with two access methods: transthoracic access and transvenous access. Transthoracic access requires lengthy sequential mapping procedures and stable arrhythmias. Transvenous access uses the multielectrode (4-to-20 electrodes) catheters placed in the coronary veins, however, leaves most of the epicardium inaccessible to direct measurement. The aim of ...
Barley M E - - 2006
Hemodynamically unstable ventricular arrhythmias are frequently untreatable with radio-frequency ablation due to the difficulty of rapidly and accurately localizing the site of origin of an arrhythmia with current technologies. We demonstrate a new catheter guidance method that will direct the tip of an ablation catheter to the site of origin ...
Ota Takeyoshi - - 2006
OBJECTIVE: Minimally invasive epicardial atrial ablation to cure atrial fibrillation through the use of a percutaneous subxiphoid approach currently has a lack of dedicated technology for intrapericardial navigation around the beating heart. We have developed a novel articulated robotic medical probe and performed preliminary experiments in a porcine preparation. METHODS: ...
Faust A - - 2006
We describe a partial sensory and motor block of the ipsilateral lower limb after interscalene infusion. After and injection of 20 mL of ropivacaine through the needle, the catheter was advanced 5 cm, and an infusion of ropivacaine 0.2% 5 mL/h commenced. Six hours later, the patient reported a left ...
Hirasawa Yasuhiro - - 2005
We report a case of idiopathic left ventricular outflow tract (LVOT) tachycardia that was eliminated by a radiofrequency application from the anterior interventricular coronary vein (AIV). The ECG exhibited QRS complexes with an inferior axis and atypical left bundle branch block pattern with an early transition of the precordial R ...
Otomo Kiyoshi - - 2005
Duodecapolar catheters (DPCs) have been widely used to diagnose isthmus block after ablation in patients with atrial flutters. The purpose of this study was to assess the ability of DPC to diagnose isthmus block utilizing electroanatomical mapping system (CARTO). METHODS: Sixty-two patients with common atrial flutter underwent isthmus ablation during ...
Emkanjoo Z - - 2005
BACKGROUND: Following RF ablation of reentrant supraventricular tachycardia, inappropriate sinus tachycardia may occur. Local parasympathetic denervation is a possible mechanism for these rhythm disturbances. The purpose of this study was to determine the incidence of sinus tachycardia and to determine the relation between endocardial lesions at different ablation sites and ...
Laeseke Paul F - - 2005
A multiple-electrode radiofrequency (RF) system was developed based on switching between electrodes that allows for the simultaneous use of as many as three electrically independent electrodes. The purpose of this study was to determine if each multiple-electrode ablation zone is identical to an ablation zone created with conventional single-electrode mode. ...
McClure Samuel J - - 2005
We wished to test the safety and efficacy of a novel wire control catheter for use during percutaneous coronary intervention. The ability to vary the angulation of the tip of an intravascular guidewire would often be desirable. Previous attempts to produce deflectable-tip guidewire systems have met with limited success. The ...
Gnanalingham Kanna K - - 2005
BACKGROUND: Blockage of the ventricular catheter is the most common reason for shunt malfunction and is usually due to ingrowth of choroid plexus into the catheter lumen. The authors describe a simple technique to unblock the ventricular catheter in situ. METHODS: In children with symptoms and radiological evidence of shunt ...
Bunch T Jared - - 2005
BACKGROUND: Perforation during catheter procedures in either the atrium or ventricle is relatively uncommon, but potentially fatal if tamponade ensues. This study analyzes the occurrence and outcomes of cardiac perforation during catheter-based radiofrequency ablation procedures in the left atrium. METHODS: All patients with a periprocedure perforation who have undergone radiofrequency ...
Holmes David R DR - - 2005
Alcohol septal ablation for the treatment of hypertrophic cardiomyopathy has been the subject of great interest, and the number of procedures performed is increasing despite an absence of randomized trial data. Although straightforward in concept, alcohol septal ablation may be considerably more difficult in actual practice. To optimize the results ...
Marine Joseph E - - 2005
Since cases were first reported in 1994, catheter ablation of atrial fibrillation has undergone rapid development and expansion. The procedure began as an attempt to recreate the Maze III operation with a catheter technique. Understanding the contribution of the pulmonary veins to the initiation and maintenance of atrial fibrillation led ...
Deneke Thomas - - 2005
INTRODUCTION: Catheter ablation of ventricular tachycardia (VT) in remote myocardial infarction (MI) often requires excessive mapping procedures. Documentation of the electrical substrate via electrogram amplitude may help to identify regions of altered myocardium resembling exit areas of reentrant VTs. METHODS AND RESULTS: A patient with multiple symptomatic monomorphic VTs (biventricular ...
Haïssaguerre Michel - - 2005
BACKGROUND: Catheter ablation of atrial fibrillation (AF) is challenging in patients with long-standing persistent AF. The clinical outcome and subsequent arrhythmia recurrence after using an ablation method targeting multiple left atrial sites with the aim of achieving acute AF termination has not been characterized. METHODS: Sixty patients (mean age: 53 ...
Badhwar Nitish - - 2005
OBJECTIVES: We sought to describe the electrophysiological features and long-term outcome after radiofrequency catheter ablation (RFCA) of atrial tachycardia (AT) arising from the coronary sinus (CS) musculature. BACKGROUND: Atrial tachycardia requiring RFCA deep within the CS has been described in isolated case reports. However, the mechanism and exact site of ...
Thiagalingam Aravinda - - 2005
INTRODUCTION: We hypothesized that automated electrogram analysis might enable rapid localization of ventricular scar. This would allow the delivery of interventions such as radiofrequency ablation or therapeutic agents to critical areas within the scar and scar periphery. METHODS: Substrate mapping was performed on seven sheep 36.5 +/- 32.9 weeks after ...
Emmel M - - 2005
Two patients, a 5 year old boy with progressive hypertrophic obstructive cardiomyopathy and increasing symptoms despite appropriate pharmacologic therapy and an 11 year old girl with symptoms of tiredness and peak instantaneous LVOT gradient of 80 and 90 mmHg respectively were considered for radiofrequency catheter septal ablation, to relieve the ...
Szili-Torok Tamas - - 2005
AIMS: Transcatheter ablation of the atrio-ventricular (AV) node followed by ventricular pacing has been shown to improve symptoms and quality of life (QOL) of patients with permanent atrial fibrillation (AF). In a considerable number of patients, cardiac function deteriorates after AV node ablation. We aimed to determine whether the absence ...
Kumagai Koji - - 2005
BACKGROUND: Radiofrequency catheter ablation (RFCA) can eliminate most idiopathic repetitive monomorphic ventricular tachycardias (RMVTs) originating from the right and left ventricular outflow tracts (RVOT, LVOT). Here, we describe the electrophysiological (EP) findings of a new variant of RMVT originating from the mitral annulus (MAVT). METHODS AND RESULTS: MAVT was identified ...
Bindra Paveljit S - - 2005
Catheter ablation therapy for ventricular tachycardia has evolved over the past 20 years to become the first-line therapy. This development has been facilitated by technology that has allowed better anatomic and electrophysiologic correlations. A better understanding of radiofrequency (RF) ablation has led to safer and more effective treatments, allowing it ...
Joshi Sandeep - - 2005
Ventricular tachycardia (VT) arising from the right ventricular outflow tract (RVOT) in the absence of overt structural heart disease is a common entity. Exclusion of occult structural disease such as arrhythmogenic right ventricular cardiomyopathy is critical as this diagnosis impacts both ablation outcomes and long-term prognosis. VT is most commonly ...
Okuyama Yuji - - 2005
We report a case of atrioventricular nodal reentrant tachycardia coexistent with atresia of the coronary sinus ostium. Radiofrequency current application between the supposed coronary sinus ostium and the tricuspid valve was effective at eliminating the tachycardia. A coronary venogram obtained by left coronary arteriography was useful for guiding the mapping ...
Kolettis Theofilos M - - 2005
We report a case of successful radiofrequency catheter ablation in a patient with dilated cardiomyopathy, who presented with multiple, haemodynamically poorly tolerated episodes of monomorphic ventricular tachycardia, resistant to antiarrhythmic drug treatment. The ablation procedure consisted of focal ablation of three mapped left ventricular sites, using pace and activation mapping. ...
Earley M J - - 2006
To investigate the feasibility of catheter ablation as a treatment for symptomatic patients with longstanding permanent atrial fibrillation (AF). Radiofrequency ablation was applied to encircle all pulmonary veins (PVs) and create lines from the left inferior PV to the mitral valve, along the roof of the left atrium between the ...
Jankovic Z - - 2005
Percutaneous bypass catheters are routinely used for veno-venous bypass (VVBP) during orthotopic liver transplantation (OLT). The recognized risks include bleeding, injury of vascular and nerve structures and lymphatic leakage. We describe a case where there were difficulties during catheterization and the patient suffered a cardiac arrest on commencing VVBP. Post-mortem ...
Wieczorek Marcus - - 2005
Endocardial catheter ablation of accessory pathways is now considered as therapy of first choice in symptomatic patients. Success rates depend on the location of the accessory pathway itself and the operators experience in catheter ablation procedures. In patients with a left-sided pathway the retrograde transaortic catheter approach is used routinely ...
Thal Sergio G - - 2005
Catheter based treatment of arrhythmia has gained significant attention during the last two decades. Due to the explosive development in ablation treatment of atrial fibrillation, huge interest in new tools was born to help in the atrial fibrillation ablation procedures. The aim of this review is to describe the role ...
Wieczorek M - - 2005
We present the case of a 44 year old woman with recurrent episodes of supraventricular tachycardia due to AV-nodal reentry (AVNRT). She was refractory to conventional medical treatment and referred to our hospital with the view to catheter ablation of the slow AV-nodal pathway. AVNRT of the common type was ...
Veldtman Gruschen R - - 2005
Perforating radiofrequency (PRF) energy has been used to obtain percutaneous transseptal left heart access. Contrary to ablative radiofrequency (RF), myocardial tissue responses to PRF thermal injury are incompletely defined. In this study, a newly developed RF catheter system for transseptal left atrial entry was compared with conventional needle puncture. Of ...
Dong Jian-zeng - - 2005
BACKGROUND: Delayed cure had been observed in recurrent cases after index ablation of atrial fibrillation (AF), however, its mechanism and incidence have not been elucidated in detail. This study aims to investigate the impact of different ablation strategies on the incidence of delayed cure and its possible mechanisms after trans-catheter ...
Magnin-Poull Isabelle - - 2005
Postatriotomy atrial tachycardia ablation. INTRODUCTION: In patients without structural heart disease, the most frequently occurring AT is the common atrial flutter. In patients with repaired congenital heart disease other mechanisms of AT may occur, due to the presence of an atriotomy that can provide a substrate for reentry. The aim ...
Baklanov Dmitri V - - 2005
Local delivery of therapeutic agents into the myocardium is limited by suboptimal imaging. We evaluated the feasibility and accuracy of live 3D echo to guide left ventricular endomyocardial injection. An intramyocardial injection catheter was positioned in the left ventricle in five healthy Yorkshire pigs using fluoroscopy. All other catheter manipulations ...
Duboc Véronique - - 2005
The asymmetric positioning of internal organs on the left or right side of the body is highly conserved in vertebrates and relies on a Nodal signaling pathway acting on the left side of the embryo. Whether the same pathway also regulates left-right asymmetry in invertebrates and what is the evolutionary ...
Kubota Satoko - - 2005
So-called unipolar 'PQS pattern' is widely accepted as a hallmark of successful catheter ablation of the left-sided atrioventricular accessory pathway. However, the unipolar nature of the electrogram and the site-dependent appearance of this characteristic pattern are poorly understood. Therefore, unipolar coronary sinus (CS) mapping was performed using a multipolar fine ...
Al-Badr Ahmed - - 2005
We report on a 56-year-old woman with irritative voiding symptoms, which started 4 months after undergoing a TVT procedure for stress incontinence (SI). Evidence of the mesh coming through the left bladder wall did not emerge until cysto-urethroscopic examination 2 years after surgery. Excision was done via transurethral cystoscopy with ...
Cheng Jie - - 2005
BACKGROUND: The anatomic substrate for protected isthmus conduction in the right atrium has been well defined. Little is known of similar substrates in the left atrium (LA). METHODS: Patients (pts) with reentrant tachycardia (AVRT) supported by a single left-sided accessory pathway were studied retrospectively (n = 64) and prospectively (n ...
Fazel Shafie - - 2005
Cellular therapy for acute myocardial infarction and ischemic cardiomyopathy has entered clinical trials across the globe. Early promising results have now provided the justification for larger randomized and blinded trials to address the efficacy of cellular therapy. A variety of fresh or cultured autologous cells have been delivered by catheter-guided ...
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