Search Results
Results 551 - 600 of 1767
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Vatasescu Radu - - 2005
Radiofrequency lesions can, theoretically, be the substrate for new persistent arrhythmias. As far as we know, this has never previously been encountered after transcatheter ablation of accessory pathways. A child with Wolff-Parkinson-White syndrome was referred for radiofrequency catheter ablation of a left-sided accessory pathway. After successful ablation of the accessory ...
Traoré Ousmane - - 2005
OBJECTIVE: To compare the rates of positive quantitative culture (PQC) of arterial catheter (AC) and central venous catheter (CVC) tips and of CVC- and AC-related bacteremia in intensive care unit patients undergoing placement of both ACs and CVCs. DESIGN: Prospective, descriptive survey. To control for a difference in the severity ...
Arya Arash - - 2005
The conduction properties of accessory pathways (APs) are independent of location and conduction mode (except in patients with multiple, Mahaim, and slowly conducting APs). Patients with right-sided APs show higher rates of atrial fibrillation and longer arrhythmia cycle length due to slower anterograde conduction over the atrioventricular node during atrioventricular ...
Laham Roger J - - 2005
Effective local delivery to the heart remains an obstacle to successful therapeutic application of a number of drugs and biological agents. This study was designed to study and optimize the delivery characteristics of transendocardial intramyocardial (IM) administration, determine myocardial deposition and retention over time, and compare it to transepicardial IM ...
Bertaglia Emanuele - - 2005
OBJECTIVE: Radiofrequency (RF) ablation at the ostia of the pulmonary veins (PVs) to cure atrial fibrillation (AF) is often followed by early AF recurrence. The aims of this study were to determine the rate of early atrial tachyarrhythmia as recurrence after circumferential anatomical PV ablation; to evaluate whether the early ...
Kilic Ayhan - - 2005
Azygos continuation is seen in 0.6% of patients with congenital heart disease. The major significance of this anomaly lies in its association with complex cardiac defects and the technical difficulty that can accompany cardiac catheterization. We report our experience with successful catheter ablation of a right posteroseptal concealed accessory pathway ...
Petrellis Basilios - - 2005
Accessory pathways are typically located along the left or right atrioventricular junction. Distinct ventricular pre-excitation patterns determined by surface electrocardiography can provide reasonable pathway localization prior to invasive mapping and catheter ablation. We report an accessory pathway producing an unusual electrocardiographic appearance suggestive of ventricular outflow region pre-excitation. Pacing maneuvers ...
Saleem Moeen A - - 2005
OBJECTIVE: To evaluate the safety and efficacy of using a circular multielectrode catheter for mapping and ablation of ventricular tachycardia (VT) or premature ventricular complexes (PVCs) from the right ventricular outflow tract (RVOT). BACKGROUND: Three-dimensional (3D) mapping systems are commonly used for mapping and ablation of RVOT VT and PVCs. ...
Thiagalingam Aravinda - - 2005
OBJECTIVES: To design and test a catheter that could create deeper ablation lesions. BACKGROUND: Endocardial radiofrequency (RF) ablation is unable to reliably create transmural ventricular lesions. We designed an intramural needle ablation catheter with an internally cooled 1.1-mm diameter straight needle that could be advanced up to 14 mm into ...
Agharazii Mohsen - - 2005
BACKGROUND: Although most catheter problems in haemodialysis are related to infection or clotting, bleeding associated with the heparin lock is of clinical importance especially during peri-operative conditions. The objective of this in vitro study is to estimate the volume of heparin that may leak into the circulation immediately after performing ...
Takemoto Masao - - 2005
OBJECTIVES: The present study evaluated clinical benefits of radiofrequency catheter ablation (RFA) for premature ventricular complexes from right ventricular outflow tract (RVOT-PVC) in patients without structural heart disease. BACKGROUND: It is unknown whether PVC causes left ventricular (LV) dilation, which is a well-recognized precursor of LV dysfunction and heart failure, ...
Cabrera José Angel - - 2005
BACKGROUND: Although linear ablation of the right atrial isthmus in patients with isthmus-dependent atrial flutter can be highly successful, recurrences and complications occur in some patients. Our study provides further morphological details for a better understanding of the structure of the isthmus. METHODS AND RESULTS: We examined the isthmic area ...
Takeyama Hiromitsu - - 2005
OBJECTIVE: Misplacement of subclavian vein catheters has been reported. We assessed the rate of misplacement of a subclavian vein catheter with and without a novel stylet. METHODS: A prospective, randomized, controlled clinical trial was conducted between September 2001 and June 2003 in a university hospital. Two hundred sixteen adult patients ...
Kurzidim Klaus - - 2005
INTRODUCTION: Cryocatheter techniques have been successfully applied to treat supraventricular tachycardia but there are no reports on their value in treating ventricular tachycardia (VT). We present our initial experience with cryocatheter ablation of right ventricular outflow tract (RVOT) tachycardia. METHODS AND RESULTS: Cryocatheter ablation was attempted in 14 patients (13 ...
Gurevitz Osnat T - - 2005
OBJECTIVE: This report describes our experience with noncontact mapping and electroanatomic mapping in complex ablations, which are defined as ablations done after failure of conventional ablation. MATERIAL AND METHODS: Patients were included (N = 68; 49% with structural heart disease) in whom previous ablation failed and in whom a second ...
Avitall Boaz - - 2005
INTRODUCTION: The coronary sinus (CS) can provide access to targets across and within the atrioventricular (AV) junction. METHODS: In 12 dogs (32 +/- 3 Kg), cryo balloons (10-19 mm) were applied to regions of the AV junction for 3 minutes at a temperature of -75.9( composite function) +/- 9(composite function)C ...
Rotter Martin - - 2005
OBJECTIVES: The purpose of this study was to evaluate a possible correlation between atrial ECG amplitude in common atrial flutter (AFL) and radiofrequency (RF) energy required to achieve cavotricuspid isthmus block. BACKGROUND: The amount of RF delivery required for ablation of typical AFL is variable. This variation has been attributed ...
LaBella Gennaro - - 2005
BACKGROUND: Traditionally, Port-A-Caths are placed with the aid of intraoperative fluoroscopy or other localizing devices. Confirmation of catheter placement and location are made intraoperatively, and this practice adds considerable cost to the overall procedure with questionable benefit. We examined the experience of a community surgeon who does not use fluoroscopy ...
Chen Minglong - - 2005
AIM: The reentry circuit of idiopathic left ventricular tachycardia (ILVT) has been demonstrated to be confined to the left posterior Purkinje network. We hypothesized that mapping and linear ablation of the left posterior fascicle (LPF) during sinus rhythm guided by non-contact mapping can effectively modify the arrhythmogenic substrate in patients ...
Unverdorben Martin - - 2005
BACKGROUND: To reduce procedural cost, cardiac centers increasingly use resterilized balloon catheters for percutaneous coronary interventions. Data addressing the procedural and mid-term outcome in a prospective randomized trial comparing new and resterilized balloons are not available. METHODS AND RESULTS: Percutaneous coronary interventions were performed at random in 238 consecutive patients ...
Della Bella Paolo - - 2005
The role of catheter ablation in the treatment of ventricular arrhythmias has been changing in the last decade, and this form of therapy now aims at curing multiple ventricular tachycardia morphologies and complex substrates in patients with structural heart disease (post-infarction and idiopathic dilated cardiomyopathy). Under these circumstances, conventional mapping ...
Sakata Yoshihito - - 2005
Indications for the transseptal approach to the left side of the heart have recently broadened, as it provides a therapeutic access for both left-sided catheter ablation and also percutaneous transvenous valvular intervention. Despite rising demand for transseptal procedures, the technique and device used for this purpose have remained essentially unchanged ...
Pappone Carlo - - 2005
Radiofrequency catheter ablation is currently used widely and successfully to treat a variety of arrhythmias, and ablation for atrial fibrillation represents the frontier of arrhythmia research. Development in many areas will offer to the electrophysiologic community a more rational and effective background upon which select patients for ablation and identify ...
Tada Hiroshi - - 2005
Tissue tracking imaging was performed in 33 patients with idiopathic ventricular arrhythmias before radiofrequency catheter ablation. The site of the arrhythmia origin, defined as the site where the earliest color-coded signal appeared on the myocardium at the onset of the arrhythmia, corresponded to the site of origin as determined on ...
Jongbloed Monique R M - - 2005
OBJECTIVES: The purpose of this study was to perform a head-to-head comparison between multislice computed tomography (MSCT) and intracardiac echocardiography (ICE). BACKGROUND: Different imaging techniques have been used to visualize the pulmonary veins (PV) before radiofrequency ablation of atrial fibrillation. METHODS: The PV and their atrial insertion were evaluated in ...
Ishikawa Susumu - - 2005
PURPOSE: The effect of epicardial radiofrequency ablation (RFA) during normal heart beating was experimentally studied in order to establish safe and effective procedures for RFA. METHODS: Seven pigs weighing approximately 30 to 50 kg were used in this study. Fifty-one epicardial RFA lesions were created on both atria using a ...
Tanner Hildegard - - 2005
OBJECTIVES: The aim of this study was to analyze different anatomic mapping approaches for successful ablation of outflow tract tachycardia with R/S transition in lead V(3). BACKGROUND: Idiopathic ventricular tachycardia can originate from different areas in the outflow tract, including the right and left ventricular endocardium, the epicardium, the pulmonary ...
Hachiya Hitoshi - - 2005
BACKGROUND: Detailed information about the topographic distribution of focal left atrial tachycardias (FLATs) is limited. METHODS AND RESULTS: A total of 143 atrial tachycardia (AT) foci were successfully ablated in 140 patients (56 men, mean age 44.6+/-17.9 years). In 36.4% (52/143 ATs), a left atrial (LA) origin of the tachycardia ...
Wu Y - - 2005
Diffusion tensor MRI is emerging as a rapid, nondestructive method to map myocardial fiber organization. A precise biological description of myocardial fiber performance requires knowledge of four variables: length, force, velocity and time. However, study of quantification of myocardial fiber length is lacking. The current study aims to show myocardial ...
Lemery Robert - - 2005
PURPOSE OF REVIEW: Atrial fibrillation can be eliminated by catheter or surgical ablation, using significantly different approaches and end points. The former has mostly been guided by electrophysiologic recordings, whereas the latter uses direct anatomic visualization. RECENT FINDINGS: Rather than focusing only on ablating triggers of atrial fibrillation, such as ...
Kongo Mariko - - 2005
Radiofrequency (RF) catheter ablation of supraventricular tachycardias causes local parasympathetic denervation. This study used heart rate variability (HRV) to evaluate the effects of ablation of atrial tachycardia (AT) arising from the atrioventricular annulus (AVAT) on autonomic function. Ten patients with AVAT were referred for ablation (group AT) and compared with ...
Daubert James P - - 2005
We sought to evaluate prospectively the safety and efficacy of cryothermal energy to ablate typical atrial flutter (AFL). Ablation of cardiac tissue using cryothermal energy has recently been developed as an alternative to radiofrequency energy, which may offer certain advantages in the treatment of AFL. This prospective, multicenter nonrandomized study ...
Dreifus Leonard S - - 2005
Ablation of supraventricular tachycardia in elderly persons presents a challenging problem to electrophysiologists. Friable cardiac structures, prone to catheter perforation, comorbid cardiovascular disease, and the propensity to develop atrial fibrillation and thromboembolic complications, place these patients at high risk. Newer techniques for cardiac mapping and ablation, the establishment of precise ...
Sharada K - - 2005
Non-surgical transpericardial approach for catheter-based epicardial radiofrequency ablation of post-infarction left ventricular tachycardia has been described as an alternative and additive procedure to standard endocardial technique for delivery of radiofrequency energy in difficult situations. We report our initial experience with this approach in three patients of post-infarction recurrent ventricular tachycardia, ...
Pachon Jose C - - 2005
Cardiac neuroablation is a new technique for management of patients with dominantly adverse parasympathetic autonomic influence. The technique is based on radiofrequency (RF) ablation of autonomic connections in the three main ganglia around the heart. Their connections are identified by Fast-Fourier Transforms (FFTs) of endocardial signals: sites of autonomic nervous ...
Friedman Peter L - - 2005
PURPOSE OF REVIEW: The purpose of the review is to provide an update on the safety and efficacy of catheter cryoablation. RECENT FINDINGS: Catheter cryoablation is a safe and clinically effective method for ablation of atrioventricular nodal reentrant supraventricular tachycardia. Although the acute procedural success rate of catheter cryoablation for ...
Takahashi Yoshihide - - 2005
Linear left atrial ablation is performed in combination with pulmonary vein (PV) isolation to improve the clinical results of atrial fibrillation (AF) ablation. These procedures require long procedures and fluoroscopic exposure. The aim of the present study was to evaluate the performance of a new, nonfluoroscopic, real-time, three-dimensional navigation system ...
Kantharia Bharat K - - 2005
Atrial tachycardias resulting from recipient-to-donor atrio-atrial conduction after orthotopic heart transplantation are difficult to treat. We present two patients in whom atrial tachycardia originating in the recipient heart were successfully treated by radiofrequency ablation guided by electroanatomical CARTO mapping system. These cases illustrate that such atrial tachycardia are curable by ...
Francis Johnson - - 2005
Arrhythmogenic right ventricular dysplasia/cardiomyopathy is a disorder characterized by frequent ventricular tachycardia originating from the right ventricle and fibro-fatty replacement of right ventricular myocardium. Though the disorder was originally described during surgical ablation of refractory ventricular tachycardia, catheter ablation of tachycardia is one of the options for patients not responding ...
Biswas Abhik K - - 2005
Long-term infusion of benzodiazepines and opioids is strongly associated with dependence and withdrawal syndromes. We report the first case of severe benzodiazepine and opioid withdrawal resulting in transient myocardial ischemia. A 6-month-old female born at 25 weeks gestation with severe opioid and benzodiazepine dependence resulting from multiple operative procedures and ...
Jais P - - 2005
Recent advancements in our understanding of atrial fibrillation have led to the development of catheter ablation techniques that feasibly could achieve a cure for AF.
Reddy Vivek Y - - 2004
OBJECTIVES: In a series of in vitro and in vivo experiments, we evaluated the feasibility of integrating three-dimensional (3D) magnetic resonance imaging (MRI) and electroanatomic mapping (EAM) data to guide real-time left ventricular (LV) catheter manipulation. BACKGROUND: Substrate-based catheter ablation of post-myocardial infarction ventricular tachycardia requires delineation of the scarred ...
Takahashi Saeko - - 2004
A 6 Fr guiding catheter is commonly used in the percutaneous coronary intervention (PCI). However, one of the limitations of the 6 Fr guiding catheter is its weak backup support compared to a 7 or an 8 Fr guiding catheter. In this article, we present a new system for PCI ...
Haghjoo Majid - - 2004
A 45-year-old woman underwent radiofrequency ablation (RFA) for symptomatic idiopathic left ventricular tachycardia (ILVT). The clinical arrhythmias had two different patterns, a wide QRS tachycardia with right bundle branch block (RBBB) and left axis deviation (LAD) and another with RBBB and right axis deviation (RAD). The electrophysiology study localized the ...
Shah Maully J - - 2004
INTRODUCTION: Radiofrequency ablation of some right-sided accessory pathways continues to be challenging. The purpose of this study was to evaluate the efficacy of introducing a multielectrode microcatheter in the right coronary artery to localize accessory pathways when conventional mapping was unsuccessful. METHODS AND RESULTS: A retrospective study was conducted of ...
Kobayashi Satoshi - - 2004
Severe acute liver dysfunction occurred following transjugular intrahepatic portosystemic shunt (TIPS) creation in a patient with massive ascites due to portal hypertension associated with primary myelofibrosis. On US and TIPS venography, we considered that the acute liver ischemia was induced by TIPS. To avoid diffuse hepatic infarction and irreversible liver ...
Sturm M - - 2004
BACKGROUND: Despite the current clinical use of radiofrequency (RF) catheter ablation in infants and children, the late effects of RF current application at immature myocardium remain unclear. The purpose of this study was to investigate incidence and time course of coronary lesions after RF current application at developing myocardium in ...
Thompson Elizabeth J - - 2004
For select individuals with chronic, drug-resistant, paroxysmal atrial fibrillation, who have failed pharmacologic suppression or mechanical cardioversion, radiofreqency ablation of ectopic foci in and around the ostia of the pulmonary veins can restore normal sinus rhythm, prevent recurrence of the arrhythmia, and improve the quality of life. Radiofrequency ablation of ...
Thiagalingam Aravinda - - 2004
BACKGROUND: We assessed the hypothesis that "virtual electrograms" from a noncontact mapping system (EnSite 3000) could be used to localize myocardial scar. METHODS AND RESULTS: Myocardial infarctions were induced in sheep by inflating an angioplasty balloon in the left anterior descending coronary artery for 3 hours. Scar mapping was performed ...
Rappaport C - - 2004
The common condition of atrial fibrillation is often treated by cutting diseased cardiac tissue to disrupt abnormal electrical conduction pathways. Heating abnormal tissue with electromagnetic power provides a minimally invasive surgical alternative to treat these cardiac arrhythmias. Radio frequency ablation has become the method of choice of many physicians. Recently, ...
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