Yukihiko Yoshida

Idiopathic Ventricular Arrhythmias Originating from the Papillary Muscles in the Left Ventricle: Prevalence, Electrocardiographic and Electrophysiological Characteristics, and Results of the Radiofrequency Catheter Ablation

Idiopathic VAs Originating from the LV Papillary Muscles.u2002Introduction: Idiopathic ventricular arrhythmias (VAs) can originate from the left ventricular (LV) papillary muscles (PAMs). This study investigated the prevalence, electrocardiographic and electrophysiological characteristics, and results of catheter ablation of these VAs, and compared them with other LV VAs.

A Randomized Controlled Trial of Dabigatran versus Warfarin for Periablation Anticoagulation in Patients Undergoing Ablation of Atrial Fibrillation

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).

Idiopathic Left Ventricular Arrhythmias Originating Adjacent to the Left Aortic Sinus of Valsalva: Electrophysiological Rationale for the Surface Electrocardiogram

IVT Arising Adjacent to the Left Sinus of Valsalva. Background: Idiopathic ventricular arrhythmias (VAs) may be amenable to catheter ablation within or adjacent to the left sinus of Valsalva (LSOV). However, features that discriminate these sites have not been defined. The purpose of this study was to determine the electrocardiographic and electrophysiological features of VAs originating within or adjacent to the LSOV.

Does RV Lead Positioning Provide Additional Benefit to Cardiac Resynchronization Therapy in Patients with Advanced Heart Failure

Background and Objectives: The left ventricular (LV) stimulation site is currently recommended to position the lead at the lateral wall. However, little is known as to whether right ventricular (RV) lead positioning is also important for cardiac resynchronization therapy. This study compared the acute hemodynamic response to biventricular pacing (BiV) at two different RV stimulation sites: RV high septum (RVHS) and RV apex (RVA).

Electrophysiologic characteristics of atrial tachycardia originating from the right pulmonary veins or posterior right atrium: Double Potentials obtained from the posterior wall of the right atrium Can be useful to Predict foci of atrial tachycardia in the right pulmonary veins or posterior right atrium

Introduction: The right pulmonary veins (RPVs) and posterior wall of the right atrium (PRA) are anatomically located adjacent to each other. The aim of this study was to demonstrate the electrophysiologic characteristics of atrial tachycardia (AT) originating from the PRA or RPVs.

Non‐Pulmonary Vein Epicardial Foci of Atrial Fibrillation Identified in the Left Atrium after Pulmonary Vein Isolation

Background: Pulmonary vein (PV) isolation (PVI) has been demonstrated to be an effective technique for curing atrial fibrillation (AF). AF foci that cannot be isolated by PVI (non‐PV foci) can become the cause of AF recurrence. The purpose of this study was to investigate the characteristics of non‐PV AF foci.

Renin‐Angiotensin System Blocker Use May Be Associated with Suppression of Atrial Fibrillation Recurrence after Pulmonary Vein Isolation

Introduction: An additional approach may be essential to reduce recurrences of atrial fibrillation (AF) after pulmonary vein isolation (PVI). We examined the efficacy of renin‐angiotensin system blockers (RAS‐B) in suppressing AF recurrences after PVI.

Outcomes of ablation of paroxysmal atrial fibrillation in patients on chronic hemodialysis.

AF Ablation in HD Patients.u2002Introduction: It is not common for patients on chronic hemodialysis (HD) to undergo catheter ablation of atrial fibrillation (AF). We aimed to show the outcomes of AF ablation in the HD patients.

Changes in repolarization properties with long-term cardiac memory modify dispersion of repolarization in patients with Wolff-Parkinson-White syndrome.

Cardiac Memory Modifies Repolarization Dispersion. Introduction: Transient T wave changes after cessation of preexcitation have been attributed to cardiac memory. However, there have been no reports on the effects of long‐term cardiac memory on repolarization dispersion before and after catheter ablation in patients with Wolff‐Parkinson‐White (WPW) syndrome.

A case with a narrow QRS complex tachycardia: is there any preexcitation?

A 34-year-old woman with a documented narrow QRS complex tachycardia was referred for catheter ablation. The tachycardia exhibited a sudden onset and offset and terminated with adenosine. In the electrophysiological study, the baseline atrial-His and His-ventricular intervals were 65 ms and 45 ms, respectively, with a narrow QRS complex (Fig. 1). During the setting of the study, catheter stimulation induced a clinical narrow QRS complex tachycardia with the earliest atrial activation at the posterolateral aspect of the mitral annulus. A definite diagnosis of an orthodromic atrioventricular reciprocating tachycardia (AVRT) was obtained by entrainment pacing from the right ventricle (RV). At the site with the earliest retrograde atrial activation within the coronary sinus (CS) during the AVRT, the ventricular activation never preceded the QRS onset during sinus rhythm after termination of the AVRT by burst pacing from the RV (Fig. 1). Was there any preexcitation in this case?