Yoshito Iesaka

Clinical implications of reconnection between the left atrium and isolated pulmonary veins provoked by adenosine triphosphate after extensive encircling pulmonary vein isolation.

Introduction: Dormant pulmonary vein (PV) conduction can be provoked by adenosine triphosphate (ATP) after extensive encircling pulmonary vein isolation (EEPVI). However, the clinical implication of reconnection between the left atrium (LA) and isolated PVs provoked by ATP (ATP‐reconnection) remains unknown.

How to Diagnose, Locate, and Ablate Coronary Cusp Ventricular Tachycardia

Catheter Ablation of LVOT VT from a Coronary Cusp. Introduction: Although radiofrequency energy usually is applied to the most favorable endocardial site in patients with outflow tract ventricular tachycardia, there are still some patients in whom the tachycardia can be ablated only from an epicardial site. We established the characteristics and technique of catheter ablation from both the left and right coronary cusps to cure left ventricular outflow tract ventricular tachycardia.

Reentrant tachycardia in pulmonary veins of patients with paroxysmal atrial fibrillation.

Introduction: Although slow automatic pulmonary vein (PV) activity dissociated from the atrium after achievement of PV isolation in patients with atrial fibrillation (AF) has been reported, little is known about dissociated PV tachycardia. The aim of this study was to investigate the inducibility and the mechanism of sustained PV tachycardia (SPVT).

Adenosine-Sensitive Atrial Reentrant Tachycardia Originating from the Atrioventricular Nodal Transitional Area

Adenosine‐Sensitive AT from AVN Area. Introduction: Atrial tachycardia shows wide variations in its electrophysiologic properties and sites of origin. We report an atrial tachycardia with ECG manifestations and electrophysiologic characteristics similar to an atypical form of AV nodal reentrant tachycardia (AVNRT).

Verapamil-Sensitive Left Anterior Fascicular Ventricular Tachycardia: Results of Radiofrequency Ablation in Six Patients

Verapamil‐Sensitive Left Anterior Fascicular VT. Introduction: Verapamil‐sensitive left ventricular tachycardia (VT) with a right bundle branch block (RBBB) configuration and left‐axis deviation bas been demonstrated to arise from the left posterior fascicle, and can be cured by catheter ablation guided by Purkinje potentials. Verapamil‐sensitive VT with an RBBB configuration and right‐axis deviation is rare, and may originate in the left anterior fascicle.

Electrocardiographic Characteristics of Repetitive Monomorphic Right Ventricular Tachycardia Originating Near the His‐Bundle

Introduction: Most idiopathic nonreentrant ventricular tachycardia (VT) and ventricular premature contractions (VPCs) arise from the right or left ventricular outflow tract (OT). However, some right ventricular (RV) VT/VPCs originate near the His‐bundle region. The aim of this study was to investigate ECG characteristics of VT/VPCs originating near the His‐bundle in comparison with right ventricular outflow tract (RVOT)‐VT/VPCs.

Chronic Hemodynamic Effects After Radiofrequency Catheter Ablation of Frequent Monomorphic Ventricular Premature Beats

Introduction: Radiofrequency catheter ablation (RFCA) of severely symptomatic monomorphic ventricular premature beats (VPBs) is reported to be a safe and effective treatment option. However, the chronic hemodynamic effects of these VPBs have not been precisely evaluated.

Idiopathic left ventricular tachycardia originating from the mitral annulus.

Background: Radiofrequency catheter ablation (RFCA) can eliminate most idiopathic repetitive monomorphic ventricular tachycardias (RMVTs) originating from the right and left ventricular outflow tracts (RVOT, LVOT). Here, we describe the electrophysiological (EP) findings of a new variant of RMVT originating from the mitral annulus (MAVT).

Retrograde multiple and multifiber accessory pathway conduction in the Wolff-Parkinson-White syndrome : Potential precipitating factor of atrial fibrillation

Retrograde Multiple Accessory Pathway Precipitating AF. Introduction: The determinants of susceptibility to atrial fibrillation (AF) and the existence of accessory pathway conduction have remained unidentified in the Wolff‐Parkinson‐White (WPW) syndrome. We tested the hypothesis that excitation inputs into the atrium over a retrograde multiple or multifiber accessory pathway during AV reentrant tachycardia (AVRT) could precipitate initiation of AF.

A Case of Catheter Ablation of Accessory Atrioventricular Connection Between the Right Atrial Appendage and Right Ventricle Guided by a Three-Dimensional Electroanatomic Mapping System

Accessory AV Connection Between RAA and RV. A 12‐year‐old girl was referred to our institution because of frequent episodes of AV reciprocating tachycardia. Ventriculoatrial and AV intervals were relatively long along the tricuspid annulus. Earliest retrograde atrial activation was recorded at the mid‐portion of the right atrial appendage. 7 mm from the tricuspid annulus. The CARTO electroanatomic mapping system was very useful for providing accurate spatial orientation of the accessory connection. Complete ablation of this connection required multiple radiofrequency energy applications over an extensive area because of the multicomponent structure of the connection.