Search Results
Results 451 - 500 of 1769
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Katsouras Grigorios - - 2006
The coronary sinus (CS) is a complex structure of particular interest to cardiac electrophysiologists. It is exploited as an anatomical reference, a site to record left-sided atrial and ventricular signals and for cardiac resynchronization therapy. Perhaps less appreciated, it may itself serve as a substrate for arrhythmias. It is now ...
Yiğit Fatma - - 2006
OBJECTIVE: The radial approach has been increasingly used as an alternative to femoral access. The purpose of the present study was to assess the feasibility, success, and safety of the transradial approach (TRA) for diagnostic coronary angiography, and to describe the difficulties associated with the technique as compared with transfemoral ...
Kalavakolanu Sharada - - 2006
We report a case of successful radiofrequency catheter ablation of idiopathic aortic cusp tachycardia arising close to right coronary artery ostium performed safely from the right ventricular outflow tract (RVOT) by unconventional superior approach. As both activation mapping and pace mapping of the tachycardia were suboptimal from transfemoral RV endocardial ...
Bhavani Sekar S - - 2006
In most cases ventricular tachycardia is responsive to antiarrhythmic drug therapy. If antiarrhythmic drugs fail, then percutaneous, endocardial ablation guided by electro-anatomical mapping is usually curative. Occasionally neither of these therapies is successful and surgical ablation is required. Challenges encountered in surgical ablation include application of reliable intraoperative real-time electro-anatomical ...
Davis Darryl R - - 2006
OBJECTIVE: Using conventional catheters, ablation of concealed parahisian accessory pathways may be difficult and high risk for heart block. METHODS AND RESULTS: We describe the case of a concealed parahisian accessory pathway with three prior attempts to ablate using conventional methods (RF and cryotherapy). Using a remote magnetic navigation system, ...
Rhee Kyoung-Hoon KH Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. - - 2006
Ventricular premature complexes (VPCs) are known to be one of the most benign cardiac arrhythmias when they occur in structurally normal hearts. We experienced a 32-year old man who presented with dyspnea, palpitations and very frequent VPCs (31% of the total heart beats). Echocardiography revealed a dilated left ventricle (LV ...
Verdino Ralph J - - 2006
The surgical approach to treat atrial fibrillation involves compartmentalizing the atrium. By dividing the atrium into discrete segments, the surgeon prevents the arrhythmia's ability to sustain by decreasing the required atrial substrate for propagation of the fibrillatory wavelets. Endocardial catheter ablation techniques used to replicate the surgical procedure were fraught ...
Abrams Dominic J - - 2006
Arrhythmia is a prevalent complication of the atriopulmonary Fontan procedure, most commonly macro-reentrant tachycardia within the right atrium as a consequence of long-term morphological and haemodynamic changes coupled with surgical intervention. We describe a patient with a long history of supraventricular arrhythmia following the atriopulmonary Fontan procedure identified as atrioventricular ...
Redfearn Damian P - - 2006
OBJECTIVES: We hypothesized an ablation strategy directly targeting muscle bundles might demonstrate functionally distinct "routes" of conduction, potentially shortening ablation times. BACKGROUND: Pathological study demonstrated that the cavotricuspid isthmus is composed of distinct anatomically defined bundles, many with intervening gaps of connective tissue. METHODS: A line was mapped in the ...
Bulava Alan - - 2006
A sixty-year-old man with previous history of coronary artery disease was admitted due to progressive worsening of dyspnoea at exertion (NYHA III functional class) and no angina. Coronary angiography confirmed occlusion of the right coronary artery which was naturally bypassed by homocollaterals with TIMI 3 flow to the peripheral branches. ...
Pedone Chiara - - 2006
Microvascular dysfunction in hypertrophic obstructive cardiomyopathy (HOCM) depends on a complex interplay of functional and anatomic mechanisms. We used myocardial contrast echocardiography in 16 consecutive patients with HOCM (mean age 49 +/- 15 years; 11 men) referred for percutaneous transluminal septal myocardial ablation to assess myocardial perfusion before and 6 ...
Pratola Claudio - - 2006
BACKGROUND: Radiofrequency ablation of fast and unstable left ventricular tachycardia (VT) usually requires non-contact mapping. The procedure is usually performed by a retrograde-transaortic route, requiring a double femoral artery puncture, for the 9F multielectrode catheter and the 7F ablation catheter which are advanced through the aorta and aortic valve into ...
Katritsis Demosthenes - - 2006
AIMS: The incidence, clinical significance and optimum treatment of AF ablation-induced proarrhythmia is not entirely known. This report describes the incidence and management of atrial arrhythmias occurring after various techniques for the ablative therapy of atrial fibrillation (AF). METHODS: Five hundred and forty-four patients with paroxysmal atrial fibrillation were subjected ...
Arias Miguel A - - 2006
We report of a patient in whom the presence of a left ventricular accessory pathway plus enhanced AV nodal conduction led to a more physiological ventricular activation sequence than that observed after ablation of the accessory pathway in a patient with baseline left bundle branch block and concealed intra-QRS pre-excitation.
Posan Emoke - - 2006
BACKGROUND: AV node slow pathway conduction can persist following successful ablation for AV node reentrant tachycardia (AVNRT). We hypothesized that careful examination of AV nodal conduction curves before and after effective AVNRT ablation in patients with persistent slow pathway conduction could shed light on this apparent paradox. METHODS AND RESULTS: ...
McLemore Elisabeth C - - 2006
Numerous studies have found no clinically significant benefit to the perioperative use of pulmonary artery catheters (PACs), and peripherally inserted central venous catheters (PICCs) have been reported to measure central venous pressure (CVP) accurately. The objective of this study was to determine whether the dynamic shifts in preload associated with ...
Fujiki Akira - - 2007
INTRODUCTION: We studied three patients who had orthodromic atrioventricular reentrant tachycardia (AVRT) using left lateral accessory pathway (AP), with difficulty in identifying the earliest site of retrograde atrial activation. METHODS AND RESULTS: Electrophysiological studies and radiofrequency ablation were performed in three patients with refractory AVRT (Case 1 was a 42-year-old ...
Burkhardt J David - - 2006
BACKGROUND: Premature ventricular contractions (PVCs) and ventricular tachycardia may arise from the coronary cusps. Navigation, mapping, and ablation in the coronary cusps can be challenging. Remote magnetic navigation may offer an alternative to conventional manually operated catheters. OBJECTIVE: We report a case of left coronary cusp ventricular tachycardia ablation using ...
Pedrote Alonso - - 2006
Radiofrequency catheter ablation of a recurrent orthodromic tachycardia was performed in a 10-year-old child with single ventricle and bidirectional Glenn procedure before a Fontan operation. Identification of a His bundle electrogram was achieved at the postero-inferior atrioventricular (AV) groove by the inferior vena cava route, and electrophysiological demonstration of a ...
Emkanjoo Zahra - - 2007
BACKGROUND: The aim of this study was to investigate the extent of myocardial injury created by radiofrequency (RF) ablation. We assessed the changes in levels of cardiac biochemical markers in patients who underwent RF ablation and we sought to evaluate the utility of cardiac troponin I (cTnI) in detecting minor ...
Kangavari Simon - - 2006
BACKGROUND: In animal models, expression of nerve growth factor (NGF) is increased after necrotic myocardial injury. Whether radiofrequency (RF) catheter ablation increases NGF expression in humans is unclear. OBJECTIVES: The purpose of this study was to determine NGF concentrations in the aorta, coronary sinus, and peripheral veins before and after ...
John Bobby - - 2006
A 13-year-old boy presented with recurrent narrow QRS tachycardia from which he had been suffering for one year. An electrophysiology study revealed a concealed left lateral accessory pathway with inducible orthodromic atrioventricular re-entry tachycardia using the same pathway. The accessory pathway was ablated in January 2004. After the ablation, atrioventricular ...
Engel David J - - 2006
BACKGROUND: The potential therapeutic uses of ultrasound energy in cardiac disease have not been extensively studied. We have developed a means to deliver high-intensity focused ultrasound (HIFU) to myocardial tissue. Unlike other therapy modalities such as radiofrequency catheter ablation, this system has the advantages of not requiring direct tissue contact ...
Hsu J-H - - 2006
BACKGROUND: When implanting a permanent central venous catheter, the usual aim is to place the tip at the superior vena cava/right atrial (SVC/RA) junction. However, data validating radiographic landmarks of the SVC/RA junction are limited. This investigation was undertaken to compare the radiographic landmarks with the SVC/RA junction as determined ...
Mansour Moussa - - 2006
BACKGROUND: Pulmonary vein isolation (PVI) has become one of the primary treatments for symptomatic drug-refractory atrial fibrillation (AF). During this procedure, delivery of ablation lesions to certain regions of the left atrium can be technically challenging. Among the most challenging regions are the ridges separating the left pulmonary veins (LPV) ...
Leung K Y Esther - - 2006
Rupture of vulnerable plaques in coronary arteries is the major cause of acute coronary syndromes. Most vulnerable plaques consist of a thin fibrous cap covering an atheromous core. These plaques can be identified using intravascular ultrasound (IVUS) palpography, which measures radial strain by cross-correlating RF signals at different intraluminal pressures. ...
Trajkov Ivan - - 2006
Atrio-ventricular node reentry (AVNRT) is typically induced with an anterograde block over the fast pathway (FP) and conduction over the slow pathway (SP), with subsequent retrograde conduction over the FP. Rarely, a premature atrial complex (PAC) conducts simultaneously over the FP and SP to induce AVNRT. Previous publications have reported ...
Kawamura Mitsuharu - - 2006
BACKGROUND: Transthoracic epicardial ablation can be an alternative to conventional treatment for critical pathways of ventricular tachycardia located in the epicardium. However, the usefulness and safety of epicardial ablation close to the coronary arteries (CA) is not clear. The purpose of the present experimental animal study was to analyze the ...
Da Costa Antoine - - 2006
AIMS: Radiofrequency ablation (RFA) of cavotricuspid isthmus (CTI)-dependent atrial flutter can be performed using various types of ablation catheters. Recent evaluations comparing externally cooled-tip RFA (ecRFA) catheters and large-tip (8 mm) catheters found that ecRFA catheter may have a higher efficacy for CTI ablation. The aim of this prospective study ...
Sacher Frédéric - - 2006
OBJECTIVES: The purpose of this study was to characterize the occurrence of phrenic nerve injury (PNI) and its outcome after radiofrequency (RF) ablation of atrial fibrillation (AF). BACKGROUND: It is recognized that extra-myocardial damage may develop owing to penetration of ablative energy. METHODS: Between 1997 and 2004, 3,755 consecutive patients ...
Hutson Mary R - - 2006
Morphogenesis of the cardiac arterial pole is dependent on addition of myocardium and smooth muscle from the secondary heart field and septation by cardiac neural crest cells. Cardiac neural crest ablation results in persistent truncus arteriosus and failure of addition of myocardium from the secondary heart field leading to malalignment ...
Ouyang Feifan - - 2006
OBJECTIVES: We sought to investigate electrophysiological characteristics and catheter ablation in patients with focal atrial tachycardia (AT) originating from the non-coronary aortic sinus (AS). BACKGROUND: In patients with failed ablation of focal AT near the His bundle (HB) region, an origin from the non-coronary AS should be considered because of ...
Thornton Andrew S - - 2006
Ablation of idiopathic left ventricular, or fascicular tachycardia can be aided by electroanatomical mapping. The addition of a floppy, magnetically enabled ablation catheter may improve maneuvering as well as decrease mechanically induced arrhythmias and mechanical block. We describe a case of fascicular tachycardia in which both these modalities were used ...
Vaseghi Marmar - - 2006
INTRODUCTION: Thermal damage to coronary arteries during catheter ablation has been previously reported. Coronary artery damage during LV outflow tract ventricular tachycardia is well recognized. However, the relationship of the coronary arteries to the RV outflow tract during catheter ablation has not been delineated. The purpose of this study was ...
Barraza M L - - 2006
Chronic indwelling central vessel catheters provide vascular access for compartmental infusion or sampling. However, complications with catheter patency during the postoperative and/or experimental period often arise. In order to identify physiological occurrences common with such complications, 10 multicatheterized sheep (61.8 +/- 7.8 kg BW), obtained from a previous nutrient flux ...
Bortone Agustín - - 2006
We report the case of a young woman in whom previous ablation of a concealed left-sided accessory pathway (AP) created an iatrogenic mitral block. The mitral block was responsible for a split retrograde atrial activation pattern during orthodromic atrioventricular re-entrant tachycardia (AVRT). The differential diagnoses are discussed. The AP was ...
Quarello Francesco - - 2006
Central venous accesses have become an integral component of vascular access procedures for hemodialysis. Although the DOQI guidelines recommend that less than 10% of chronic hemodialysis patients should be maintained on catheters, in some countries higher prevalences are reported, as in the United States and the United Kingdom (18% and ...
Amasyali Basri - - 2006
Permanent form of junctional reciprocating tachycardia (PJRT) is an uncommon form of atrioventricular re-entrant tachycardia due to an accessory pathway characterized by slow and decremental retrograde conduction. The majority of accessory pathways in PJRT are localized in the posteroseptal zone. Despite the high success rate, failure may occur during endocardial ...
Yoerger Danita M - - 2006
Fatty acid ethyl esters (FAEEs), nonoxidative metabolites of ethanol, have been implicated in ethanol-induced heart injury. To assess the in vivo production of FAEEs by myocardial tissue, we used a modified ethanol ablation procedure in pigs. A controlled 60-minute ethanol infusion was administered into the distal left anterior descending coronary ...
Al-Ammouri Iyad - - 2006
The distance from the endocardial surface of the atrioventricular valve annulus and adventia of the adjacent coronary artery (CA) has not been delineated and may play an important role in the risk for CA damage during catheter ablation procedures. This distance was measured in 10 normal pediatric heart specimens at ...
Earley Mark J - - 2006
AIMS: To compare the utility of non-fluoroscopic mapping systems (Carto and Ensite NavX) with that of conventional mapping in patients referred for catheter ablation of a wide variety of arrhythmias. METHODS AND RESULTS: Patients referred for catheter ablation (excluding atrial fibrillation, atypical atrial flutter, ventricular tachycardia in structural heart disease, ...
Magnano Anthony R - - 2006
INTRODUCTION: Typical and atypical atrial flutters (AFLs) and atrial tachycardias (ATs) have been reported in patients with prior surgical atrial fibrillation ablation. The underlying mechanisms for this group of atrial tachyarrhythmias have not been well characterized and the efficacy of catheter ablation in their treatment is unknown. METHODS AND RESULTS: ...
Mlcochova Hanka - - 2006
Recent studies have demonstrated that premature ventricular contractions (PVCs) originating from the Purkinje system are responsible for initiation of ventricular fibrillation (VF) in patients with and without structural heart disease. Ablation of the PVCs has been shown to be feasible. We report 2 patients with repetitive VF associated with cardiac ...
Yamada Takumi - - 2006
To avoid fatal complications after extensive pulmonary vein (PV) ablation, it has been proved important to comprehend the anatomic relation between the PVs and the esophagus. In 42 consecutive patients with atrial fibrillation, PV ostial isolation was performed using a basket catheter. The shortest distance and anatomic relation between the ...
Shanmugam N - - 2006
An interesting development in the field of heart failure has been the link between frequent premature ventricular contractions and cardiomyopathy. We report a patient whose frequent ventricular bigeminy resulted in left ventricular impairment that resolved after the use of non-contact mapping during radiofrequency ablation. A review of the literature regarding ...
Zei Paul C - - 2006
Percutaneous entry into the pericardial space allows epicardial catheter mapping and ablation in the electrophysiology laboratory, opening a perspective on cardiac electrophysiology that previously was limited largely to the operating room. Scar-related reentry after myocardial infarction usually involves the subendocardium but in some patients can only be ablated from the ...
Opie Shaun R - - 2006
Autologous skeletal myoblast (ASM) transplantation is being explored as a possible therapy for patients who have suffered a myocardial infarction. Our initial experience with direct injection during coronary artery bypass grafting demonstrated that this method of delivery was both feasible and safe. In addition, proof of concept of the engraftment ...
Ahmed Jameel - - 2006
BACKGROUND: Balloon ablation catheters using various energy sources are being developed to perform pulmonary vein (PV) isolation to treat atrial fibrillation. Prior evaluations of 2D CT/MR images are limited by the frequent elliptical shape of the PV ostia, the nonorthogonal orientation of the PVs to the left atrial (LA) chamber, ...
Vijayaraman Pugazhendhi - - 2006
BACKGROUND: Successful radiofrequency (RF) ablation of typical, isthmus-dependent atrial flutter requires establishment and confirmation of bidirectional conduction block across the cavotricuspid isthmus. Low atrial pacing usually is performed from the bipoles of the 20-pole Halo catheter, septal and lateral to the cavotricuspid isthmus ablation line. However, occasionally this is difficult ...
Lobel Robert M - - 2006
Radiofrequency ablation of complex cardiac arrhythmias has undergone significant evolution in the past decade, with the development of technology enabling better anatomic and electrophysiologic mapping of abnormal cardiac tissue. In this paper, we will discuss the role of pre-procedural and post-procedural multidetector computed tomography, with specific focus on the anatomic ...
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