Search Results
Results 401 - 450 of 1859
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Wang X X - - 2009
This study characterized CXC chemokine receptor 4 (CXCR4) expression in patients with mitral valve disease and chronic atrial fibrillation (AF). Forty-eight patients with chronic AF formed two groups based on whether they were treated with or without renin-angiotensin system (RAS) blockers (AF + RAS group; n = 25, or AF ...
Hindricks Gerhard - - 2009
AIMS: Radiofrequency catheter ablation of typical atrial flutter is one of the most frequent indications for catheter ablation in electrophysiology laboratories today. Clinical utility of electroanatomic mapping systems on treatment results and resource utilization compared with conventional ablation has not been systematically investigated in a prospective multicenter study. METHODS AND ...
Arruda Mauricio S - - 2009
BACKGROUND: Ablation for atrial fibrillation (AF) requires energy delivery in close proximity to the esophagus (Eso) which has accounted for the LA-Eso fistula, a rare but life-threatening complication. PURPOSE: We evaluated an Eso cooling system to protect the Eso during RF ablation. METHODS AND RESULTS: An "in vitro" heart-Eso preparation ...
Michael Kevin A - - 2009
BACKGROUND: Thromboembolic complications during left-sided ablations range between 1.5 and 5.4%. Preprocedural TEE has been used to exclude the presence of left atrial thrombi in order to minimize risk. The use of TEE is empiric and it has not been evaluated in contemporary practice. METHODS AND RESULTS: A multicenter national ...
Chang Shih-Lin - - 2009
INTRODUCTION: Although several studies have reported the benefits of cooled-tip ablation for circumferential pulmonary veins isolation (CPVI), the acute change of substrate property and acute PV reconnection have not been well demonstrated. The aim of this study was to compare the cooled-tip with regular 4-mm-tip catheter in acute substrate change ...
Po Sunny S - - 2009
The intrinsic cardiac autonomic nervous system (ICANS), which forms a neural network, has been shown to be a critical element responsible for the initiation and maintenance of atrial fibrillation (AF). We developed a technique to localize and ablate the ganglionated plexi (GP), which serves as the "integration centers" of the ...
Nair Mohan - - 2009
Complex fractionated atrial electrograms (CFAEs) have shown promise as target sites for ablation of atrial fibrillation (AF); however, the data are limited with regard to patients with a large left atrium (LA) (>5 cm), and/or a permanent AF duration of >2 years. We tested the hypothesis that ablation of user-defined, ...
Pérez Francisco J - - 2009
BACKGROUND: Despite the success of catheter ablation of cavotricuspid isthmus-dependent atrial flutter (AFL), important postablation outcomes are ill-defined. The purpose of our study was to analyze long-term outcomes after catheter ablation of cavotricuspid isthmus-dependent AFL. METHODS AND RESULTS: A meta-analysis was performed of articles reporting clinical outcomes after catheter ablation ...
Joshi Sandeep - - 2009
Following pulmonary vein isolation (PVI) for atrial fibrillation (AF), early recurrences are frequent, benign and classified as a part of a "blanking period." This study characterizes early recurrences and determines implications of early AF following PVI. Seventy-two consecutive patients (59.8 +/- 10.7 years, 69% male) were studied following PVI for ...
Gula Lorne J - - 2009
BACKGROUND: Radiofrequency ablation (RFA) of the cavotricuspid isthmus (CTI) is an established therapy for typical atrial flutter. Previous studies have demonstrated that the CTI is often composed of discrete muscle bundles, and evidence has suggested that these bundles correlate with high-voltage local electrograms in the tricuspid isthmus. This randomized, multicenter ...
Ahmed Mustafa I MI University of Alabama at Birmingham, 1530 3rd Avenue South, CH-19, Ste-219, Birmingham, AL 35294-2041, - - 2009
Atrial fibrillation (AF)-associated poor outcomes in heart failure (HF) are often attributed to older age, advanced disease, and comorbidity burden of HF patients with AF. Therefore, we examined the effect of AF on outcomes in a propensity-matched study in which patients with and without AF were well balanced on all ...
Manusama Randy - - 2009
PURPOSE: Catheter-based cryoablation (cryo) has proven to be as effective as radiofrequency energy (RF) ablation for the treatment of arrhythmias. Nevertheless, the duration of cryoapplications has been reported as being significantly longer than RF applications. METHODS: Thirty-seven consecutive patients (28 men; mean age 59 +/- 14 years) with typical atrial ...
Lönnerholm Stefan - - 2009
BACKGROUND: Cox Maze surgery for atrial fibrillation (AF) has been found to have high efficacy in maintaining sinus rhythm and has been shown to improve quality of life early after surgery, but reports on long-term effects in this respect are lacking. This study was therefore undertaken to evaluate the effect ...
Lopes Renato D - - 2009
To assess the incidence and timing of atrial fibrillation (AF), describe antithrombotic therapy use, and evaluate the association of AF with 90 day mortality and other secondary clinical outcomes. We studied 5745 ST-segment elevation myocardial infarction patients treated with primary percutaneous coronary intervention (PCI) in APEX-AMI. Approximately 11% had AF ...
Sawhney Navinder N Division of Cardiology, and Cardiac Electrophysiology Program, University of California, San Diego, California. - - 2009
Most studies evaluating the efficacy of atrial fibrillation (AF) ablation report follow-up periods of 1 year to 2 years, but few report long-term results of > or =5 years after ablation. Therefore, we evaluated the long-term efficacy (i.e., >5 years) of segmental antrum pulmonary vein isolation (PVI) for paroxysmal AF. ...
Marijon Eloi - - 2009
Interventional cardiology in a day-case setting might reduce logistic constraints on hospital resources. However, in contrast with coronary angioplasty, few data support the feasibility and safety of radiofrequency catheter ablation (RCA). The aim of this prospective, multicenter cohort study was to evaluate the feasibility and safety of RCA in 1,342 ...
Han Frederick T - - 2009
BACKGROUND: The Cox Maze procedure for treatment of medically refractory atrial fibrillation (AF) is limited by its complexity and requirement for cardiopulmonary bypass. Long-term follow-up and success using criteria established by the Heart Rhythm Society/European Heart Rhythm Association/European Cardiac Arrhythmia Society consensus statement have not been reported for surgical AF ...
Calkins Hugh - - 2009
BACKGROUND: Although radiofrequency catheter ablation (RFA) has evolved from an experimental procedure to an important treatment option for atrial fibrillation, the relative safety and efficacy of catheter ablation relative to that of antiarrhythmic drug (AAD) therapy has not been established. METHODS AND RESULTS: Two separate systematic reviews were conducted: one ...
Markovic Jovan N - - 2009
The two currently available methods to achieve ablation of incompetent veins using radiofrequency energy are radiofrequency ablation (VNUS Closure Plus(tm)) and radiofrequency powered segmental ablation (VNUS Closure Fast(tm)). Both treatment modalities expose vascular endothelium to high-frequency alternating current. This results in contraction of venous wall collagen with subsequent fibrotic endoluminal ...
Castellanos Eduardo - - 2009
BACKGROUND: In typical counterclockwise atrial flutter (AFL), the route of impulse propagation to anteroinferior right atrium (AIRA) during transient entrainment (TE) from the coronary sinus (CS) is expected to be similar to that during pacing from the same CS site during sinus rhythm (SR) when cavotricuspid isthmus (CTI) block has ...
Zheng Bin - - 2009
OBJECTIVE: Previous studies have shown that angiotensin-converting enzyme inhibitors (ACEIs) and angiotensin II receptor blockers (ARBs) could reverse structural and electrical atria remodelling and decrease atrial fibrillation (AF) onset or recurrence. The aim of this retrospective study was to investigate whether ACEIs/ARBs had beneficial effects on ablation outcome of chronic ...
Doliwa Peter Sobocinski - - 2009
OBJECTIVES: We evaluated a short-term ECG, thumb ECG, for detection of asymptomatic atrial fibrillation (AF) episodes. The aim was to evaluate registration efficacy, sensitivity, specificity, quality and feasibility in patients with special emphasis on asymptomatic AF. DESIGN: One hundred patients registered their cardiac rhythm with 12-lead ECG immediately followed by ...
Lin Yenn-Jiang - - 2009
BACKGROUND: The efficacy of ablation of complex fractionated atrial electrograms (CFEs) in the single ablation procedure for nonparoxysmal atrial fibrillation (AF) patients is not well demonstrated. The aim of this study was to compare the ablation strategies of pulmonary vein isolation (PVI) plus linear ablation with and without additional ablation ...
Gist Katja M - - 2009
OBJECTIVE: To compare the acute success and recurrence rate of cryoablation for left-sided accessory pathways (AP) with controls who underwent radiofrequency ablation (RFA) at the same institution. BACKGROUND: Catheter cryoablation of supraventricular tachycardia (SVT) is considered to be a safer alternative a compared with RFA. At our institution, cryoablation has ...
de Groot Natasja M S - - 2009
BACKGROUND: Catheter ablation has evolved as a possible curative treatment modality for supraventricular tachycardias (SVT) in patients with univentricular heart. However, the long-term outcome of ablation procedures is unknown. We evaluated the procedural and long-term outcome of ablative therapy of late postoperative SVT in patients with univentricular heart. METHODS AND ...
Iishi Tatsuhiko - - 2009
The present study was performed to clarify the effect of hypertonic saline infusion into the lung parenchyma on radiofrequency ablation (RFA) of the lungs. A total of 20 ablation zones were created in 3 pigs. The ablation zones were divided into 3 groups. Group 1 (n=6) consisted of ablation zones ...
Macle Laurent - - 2009
Atrial fibrillation (AF) is often triggered by ectopic foci originating from pulmonary veins (PVs), with the posterior left atrium (LA) comprising part of the substrate for maintenance. Catheter ablation strategies targeting PVs and the posterior LA may be further refined by incorporating technology beyond standard fluoroscopy. To prospectively assess the ...
Moubarak Ghassan - - 2009
Radiofrequency ablation is an effective treatment for typical atrial flutter (AFL) but long-term results may be hampered by atrial fibrillation (AF). To determine the incidence and predictors of AF during very long-term follow-up after radiofrequency ablation of typical AFL. From November 1998 to December 2000, patients who underwent successful radiofrequency ...
Wang X - - 2009
AIMS: To compare the efficacy and safety of pulmonary vein (PV) isolation combined with substrate modification for persistent atrial fibrillation (AF) treatment in patients with and without valvular heart disease (VHD). METHODS AND RESULTS: 111 patients with persistent AF were enrolled for catheter ablation: 51 with valvular heart disease (group ...
Shaheen Nicholas J - - 2009
BACKGROUND: Barrett's esophagus, a condition of intestinal metaplasia of the esophagus, is associated with an increased risk of esophageal adenocarcinoma. We assessed whether endoscopic radiofrequency ablation could eradicate dysplastic Barrett's esophagus and decrease the rate of neoplastic progression. METHODS: In a multicenter, sham-controlled trial, we randomly assigned 127 patients with ...
Lan X - - 2009
BACKGROUND: Although amiodarone plus angiotensin II receptor blockers (ARBs) and catheter ablation may improve sinus rhythm maintenance of paroxysmal atrial fibrillation (AF), their clinical efficacies have not been compared. This prospective cohort study was designed to compare clinical efficacy of catheter ablation and amiodarone plus losartan on sinus rhythm maintenance ...
Suissa Laurent - - 2009
BACKGROUND AND PURPOSE: The high risk of recurrence and comorbidity after a stroke associated with atrial fibrillation (AF) justifies an aggressive diagnostic approach so that anticoagulant treatment can be initiated. METHODS: The clinical and paraclinical characteristics of consecutive ischemic stroke patients with and without documented AF were recorded. Independent predictive ...
Chan Ngai Yin - - 2009
AIMS: To compare recurrence rate and other procedural characteristics in patients undergoing atrioventricular nodal re-entrant tachycardia (AVNRT) treatment with catheter cryoablation (CRYO) delivered by 6 mm-tip catheter or radiofrequency (RF) ablation. METHODS AND RESULTS: This is a retrospective case-control study including 80 patients with AVNRT treated with CRYO from March ...
Jons Christian - - 2009
AIMS: No large randomized multicentre trial has evaluated the efficacy of radiofrequency ablation (RFA) vs. anti-arrhythmic drug (AAD) therapy as a first-line treatment of paroxysmal atrial fibrillation (AF). METHODS AND RESULTS: The Medical ANtiarrhythmic Treatment or Radiofrequency Ablation (MANTRA-PAF) trial is a randomized, controlled, parallel group, multicentre study designed to ...
Forleo Giovanni B - - 2009
Controversies exist with regard to the optimal management of atrial fibrillation (AF). Restoration and maintenance of sinus rhythm is a desirable goal in AF patients because the prevention of recurrences may improve cardiac function, relieve symptoms and should reduce the likelihood of adverse events. Pharmacological therapy for AF has been ...
Niwano Shinichi - - 2009
BACKGROUND: Spectral analysis of the fibrillation waves was performed in patients with persistent atrial fibrillation (PAF) to clarify the usefulness of this method of predicting the efficacy of antiarrhythmic agents. METHODS AND RESULTS: The 59 patients with PAF were randomly assigned to pilsicainide (150 mg/day) or bepridil (200 mg/day) therapy ...
Rhim Hyunchul - - 2010
This study was designed to evaluate whether a feasibility scoring system for planning sonography is a reliable predictor of a safe and complete ablation in ultrasonography (US)-guided percutaneous radiofrequency ablation (RFA) of hepatocellular carcinomas (HCCs). We retrospectively evaluated the therapeutic outcomes of 108 consecutive patients (M:F, 78:30; mean age, 57.4 ...
Je Hyung Gon - - 2009
OBJECTIVE: Since the late 1980s, surgical ablation of atrial fibrillation (AF) has been one of the most effective means of curing this arrhythmia. However, about 20% of patients who underwent maze procedures have shown recurrence of AF during the follow-up periods. The aim of this study is to evaluate our ...
Rasekhi A R - - 2009
OBJECTIVE: We investigated the efficacy and safety of radiofrequency ablation on the hematologic parameters in patients with thalassemia intermedia (TI). MATERIALS AND METHODS: Radiofrequency ablation of the spleen was performed in 15 children with TI under general anesthesia using a cool-tip radiofrequency probe. These patients were regarded as the radiofrequency ...
Benussi Stefano - - 2009
PURPOSE: Although it is deemed important, right atrial ablation is not considered feasible with bipolar radiofrequency alone. Normally, unipolar devices are used to complete the tricuspid connecting lines. We describe a simple technique to achieve a complete maze-like set of right ablations using a standard bipolar radiofrequency device. DESCRIPTION: Thirty-four ...
Gammie James S - - 2009
BACKGROUND: Few studies have reported long-term outcomes of surgical atrial fibrillation (AF) correction. We perform the Cox-Maze III lesion set with argon-powered cryoenergy (CryoMaze procedure) on all patients with AF presenting for cardiac operations. This study reports long-term clinical results and heart rhythm status. METHODS: Between July 2002 and November ...
Ricci Renato Pietro - - 2009
AIMS: The aim of the present analysis of the DATAS study was to compare the impact of dual- vs. single-chamber defibrillators on atrial fibrillation (AF) occurrence and AF-related clinical events in patients with Class I indication for implantable cardioverter defibrillators (ICDs) and no indication for dual-chamber pacing. METHODS AND RESULTS: ...
Deneke Thomas - - 2009
INTRODUCTION: Short- and medium-term sinus rhythm (SR) rates after intraoperative radiofrequency ablation to treat permanent atrial fibrillation (AF) are well documented. Is rhythm success stable during a long-term follow-up? METHODS AND RESULTS: A total of 130 patients who had undergone intraoperative radiofrequency cooled-tip endocardial ablation (SICTRA) of permanent AF (mean ...
Park Jeong-Hwan - - 2009
It is known that angiotensin converting enzyme inhibitors and angiotensin II type 1 receptor blockers (ACEIs and ARBs, respectively) are effective in preventing atrial fibrillation (AF) in high-risk patients. However, it is not known whether ACEIs and ARBs are effective in preventing the recurrence of AF after catheter ablation. One ...
- - 2009
BACKGROUND: Atrial fibrillation is the most common cardiac arrhythmia, and no current therapy is ideal for control of this condition. Experimental studies suggest that angiotensin II-receptor blockers (ARBs) can influence atrial remodeling, and some clinical studies suggest that they may prevent atrial fibrillation. METHODS: We conducted a large, randomized, prospective, ...
Iliuta Luminita - - 2009
In this study, we tried to compare the efficacy and safety of betaxolol vs. metoprolol immediately postoperatively in coronary artery bypass grafting (CABG) patients and to determine whether prophylaxy for atrial fibrillation (AF) with betaxolol could reduce hospitalization and economic costs after cardiac surgery. Our trial was open-label, randomized, multicentric ...
Alcaraz Raúl - - 2009
Electrical cardioversion (ECV) has become a mainstay of therapy for the treatment of persistent atrial fibrillation (AF), which is an arrhythmia that affects up to 1% of the general population. The procedure is initially effective, but it is also characterized by a high rate of AF recurrence. As a consequence, ...
Miyanaga Satoru - - 2009
AIMS: The efficacy of catheter-based pulmonary vein isolation (PVI) for paroxysmal atrial fibrillation (AF) and prolonged sinus pauses [bradycardia-tachycardia syndrome (BTS)] has been already described. However, the effects of PVI on autonomic modulation in BTS patients remain to be determined. We, therefore, examined the alteration in the autonomic modulation through ...
Roberts-Thomson Kurt C - - 2009
BACKGROUND: The posterior left atrium (LA) is involved in the initiation and maintenance of atrial fibrillation (AF). OBJECTIVE: The purpose of this study was to compare conduction patterns on the posterior LA in patients with mitral regurgitation (MR), with and without AF. METHODS: Epicardial mapping of the posterior LA was ...
Fontes Manuel L - - 2009
OBJECTIVE: To better understand the relationship between humoral and cellular markers of inflammation and postoperative atrial fibrillation (AF). DESIGN: A prospective and descriptive study. SETTING: Academic institution. PARTICIPANTS: Sixty adult patients > or = 60 years of age presenting for elective coronary artery bypass surgery with cardiopulmonary bypass (CPB). INTERVENTIONS: ...
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