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OBJECTIVES This study investigated the prevalence and electrocardiographic and electrophysiologic characteristics of aortic root ventricular arrhythmias (VAs). BACKGROUND Idiopathic VAs originating from the ostium of the left ventricle may be ablated at the base of the aortic cusps. METHODS We studied 265 patients with idiopathic VAs with an inferior(More)
BACKGROUND We aimed to evaluate the feasibility of an oral direct thrombin inhibitor, dabigatran, as a periprocedural anticoagulant for use with ablation of atrial fibrillation (AF). METHODS Consecutive patients scheduled to undergo an AF ablation were randomly assigned to receive dabigatran (n = 45) or warfarin (n = 45) to compare their clinical(More)
BACKGROUND The summit of the left ventricle (LV) is the most superior portion of the epicardial LV bounded by an arc from the left anterior descending coronary artery, superior to the first septal perforating branch to the left circumflex coronary artery. Ventricular arrhythmias (VAs) originating from this region may present challenges for catheter(More)
BACKGROUND Medical therapy of atrial fibrillation (AF) can be challenging in patients with Brugada electrocardiograms (ECGs). The purpose of this study was to investigate the efficacy of pulmonary vein (PV) isolation (PVI) in AF patients with Brugada ECGs. METHODS AND RESULTS PVI was performed in 6 consecutive patients exhibiting Brugada ECGs (type I in(More)
BACKGROUND AND OBJECTIVES Two new oral anticoagulants, rivaroxaban and dabigatran, with no need for anticoagulation monitoring, are available for patients with atrial fibrillation (AF). We aimed to compare their anticoagulant effects and safety when used during the AF ablation periprocedural period. METHODS Patients undergoing AF ablation were randomly(More)
BACKGROUND Idiopathic ventricular arrhythmias (VAs) can originate from the left ventricular papillary muscles (PAMs). This study investigated the electrophysiological characteristics of these VAs and their relevance for the results of catheter ablation. METHODS AND RESULTS We studied 19 patients who underwent successful catheter ablation of idiopathic VAs(More)
AIMS Managed ventricular pacing (MVP) and Search AV+ are representative dual-chamber pacing algorithms for minimizing ventricular pacing (VP). This randomized, crossover study aimed to examine the difference in ability to reduce percentage of VP (%VP) between these two algorithms. METHODS AND RESULTS Symptomatic bradyarrhythmia patients implanted with a(More)
AIMS The aim of this study was to investigate the change in plasma brain natriuretic peptide (BNP) level after pulmonary vein isolation (PVI) in paroxysmal (PAF), persistent (Pers-AF), and permanent atrial fibrillation (AF) (Perm-AF) patients. METHODS AND RESULTS In 96 lone AF patients (PAF=65, Pers-AF=17, and Perm-AF=14), BNP was measured before and 3(More)
A 65-year-old man with frequent premature ventricular contractions (PVCs) underwent electrophysiological testing. Although an excellent pace map was obtained from the right coronary cusp (RCC), radiofrequency ablation at that site interrupted the PVCs transiently. Successful ablation was achieved in the left coronary cusp with earlier local ventricular(More)
BACKGROUND The left atrial appendage (LAA) is one of the major sources of focal atrial tachycardias (ATs). OBJECTIVE The purpose of this study was to investigate the detailed electrophysiologic characteristics and catheter ablation of focal ATs originating from the LAA. METHODS The study population consisted of 47 consecutive patients with 50 focal ATs(More)