Kenzo Hirao

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.

Prospective Evaluation of Bilateral Diaphragmatic Electromyograms During Cryoballoon Ablation of Atrial Fibrillation.

Left phrenic nerve injury (PNI) can occur during cryoballoon ablation of the left pulmonary veins (PVs). This study aimed to evaluate the feasibility of monitoring the bilateral phrenic nerve function during cryoballoon ablation of atrial fibrillation (AF).

Pulmonary Vein Isolation Using a Second-Generation Cryoballoon in Patients With Paroxysmal Atrial Fibrillation: One-Year Outcome Using a Single Big-Balloon 3-Minute Freeze Technique.

The second‐generation cryoballoon (CB) has been recently introduced into clinical use for pulmonary vein isolation (PVI). Data on the feasibility, long‐term outcome, and optimal freeze cycle are still limited. We assessed the 1‐year clinical outcome after second‐generation CB ablation with single 3‐minute freeze techniques, and clinical variables associated with AF recurrence.

Impact of Non-Pulmonary Vein Foci on the Outcome of the Second Session of Catheter Ablation for Paroxysmal Atrial Fibrillation

Paroxysmal atrial fibrillation (AF) is primarily triggered by pulmonary veins (PVs). However, non‐PV AF foci may also trigger AF.

Role of arrhythmogenic superior vena cava on atrial fibrillation.

It is well known that superior vena cava (SVC) is one of the important non‐pulmonary vein (PV) foci of atrial fibrillation (AF). However, little is known regarding the role of arrhythmogenic SVC in AF.

Ventricular Echo Beats and Retrograde Atrioventricular Nodal Exits in the Dog Heart: Multiplicity in Their Electrophysiologic and Anatomic Characteristics

Ventricular Echo Beats and Retrograde AV Nodal Exits. Introduction: A single ventricular echo beat frequently is induced in the dog heart by ventricular pacing, but it has not been investigated using a concomitant ablative technique. We studied the effects of ablating the anterior atrial input to the AV node on ventricular echo beats induced in the dog heart to evaluate their electrophysiologic characteristics, the anatomic reentrant circuit, and the retrograde AV nodal exits.

Augmentation of QRS Wave Amplitudes in the Precordial Leads During Narrow QRS Tachycardia

Increase of Precordial QRS Amplitude During SVT. Introduction: QRS morphology during narrow QRS supraventricular tachycardia in patients without ventricular preexcitation generally is considered the same as that seen during sinus rhythm. This study presents a new ECG observation that the QRS amplitude increased significantly in leads V, through V, during tachycardia.

Adenosine Triphosphate Test After Cryothermal Pulmonary Vein Isolation: Creating Contiguous Lesions Is Essential for Eliminating Dormant Conduction

Adenosine triphosphate (ATP) testing reveals dormant pulmonary vein (PV) conduction after electrical PV isolation (PVI). This study aimed to evaluate the incidence of latent PV conduction after cryothermal PVI.

Utility of Distinctive Local Electrogram Pattern and Aortographic Anatomical Position in Catheter Manipulation at Coronary Cusps

Distinctive Electrogram and Aortography of Coronary Cusp.u2002Background: The coronary cusps have recently become target sites for radiofrequency catheter ablation of both outflow tract ventricular arrhythmias originating near the coronary cusps (CC‐VA) and atrial tachyarrhythmias such as focal atrial tachycardia originating near the noncoronary cusp (NCC‐AT). However, the relation between local electrograms recorded at each CC during sinus rhythm and their anatomical position as assessed by aortography has not yet been systematically described.

“Paradoxical” AH Shortening Caused By Proximal Coronary Sinus Stimulation During Orthodromic Reciprocating Tachycardia

AH Shortening During ORT. Introduction: During extrastimulation or entrainment of orthodromic atrioventricular (AV) reciprocating tachycardia (ORT), the atriuni‐His (AH) interval as measured at the His‐bundle recording site is expected to lengthen due to extrastimu‐Lation‐dependent or pacing rate‐dependent slowing of AV nodal conduction by impulses that penetrate the tachycardia circuit. We report 6 patients in whom the AH interval “paradoxically” shortened during ORT in response to extrastimulation and rapid pacing from the proximal coronary sinus.