Kenzo Hirao
Tokyo Medical and Dental University
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Publication
Featured researches published by Kenzo Hirao.
Journal of Cardiovascular Electrophysiology | 2007
Hitoshi Hachiya; Kenzo Hirao; Atsushi Takahashi; Yasutoshi Nagata; Kenji Suzuki; Shingo Maeda; Takeshi Sasaki; Mihoko Kawabata; Mitsuaki Isobe; Yoshito Iesaka
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.
Journal of Cardiovascular Electrophysiology | 2015
Shinsuke Miyazaki; Hitoshi Hachiya; Hiroshi Taniguchi; Hiroaki Nakamura; Noboru Ichihara; Eisuke Usui; Akio Kuroi; Takamitsu Takagi; Jin Iwasawa; Kenzo Hirao; Yoshito Iesaka
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).
Journal of Cardiovascular Electrophysiology | 2016
Shinsuke Miyazaki; Hitoshi Hachiya; Hiroaki Nakamura; Hiroshi Taniguchi; Takamitsu Takagi; Kenzo Hirao; Yoshito Iesaka
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.
Journal of Cardiovascular Electrophysiology | 2015
Masateru Takigawa; Atsushi Takahashi; Taishi Kuwahara; Kenji Okubo; Yoshihide Takahashi; Emiko Nakashima; Yuji Watari; Kazuya Yamao; Jun Nakajima; Katsumasa Takagi; Shigeki Kimura; Hiroyuki Hikita; Kenzo Hirao; Mitsuaki Isobe
Paroxysmal atrial fibrillation (AF) is primarily triggered by pulmonary veins (PVs). However, non‐PV AF foci may also trigger AF.
Journal of Cardiovascular Electrophysiology | 2014
Shinsuke Miyazaki; Masateru Takigawa; Shigeki Kusa; Taishi Kuwahara; Hiroshi Taniguchi; Kenji Okubo; Hiroaki Nakamura; Hitoshi Hachiya; Kenzo Hirao; Atsushi Takahashi; Yoshito Iesaka
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.
Journal of Cardiovascular Electrophysiology | 2001
Nobuo Toshida; Kenzo Hirao; Naohito Yamamoto; Michio Tanaka; Fumio Suzuki; Mitsuaki Isobe
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.
Journal of Cardiovascular Electrophysiology | 2000
Hiroko Wakimoto; Naomi Izumida; Yuh Asano; Masayasu Hiraoka; Tokuhiro Kawara; Kazumasa Hiejima; Kenzo Hirao; Fumio Suzuki
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.
Journal of Cardiovascular Electrophysiology | 2015
Shinsuke Miyazaki; Hiroshi Taniguchi; Hiroaki Nakamura; Hitoshi Hachiya; Noboru Ichihara; Makoto Araki; Akio Kuroi; Takamitsu Takagi; Jin Iwasawa; Kenzo Hirao; Yoshito Iesaka
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.
Journal of Cardiovascular Electrophysiology | 2011
Takeshi Sasaki; Hitoshi Hachiya; Kenzo Hirao; Koji Higuchi; Tatsuya Hayashi; Toshiyuki Furukawa; Mihoko Kawabata; Atsushi Takahashi; Mitsuaki Isobe
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.
Journal of Cardiovascular Electrophysiology | 1993
Fumio Suzuki; Tomoo Harada; Tokuhiro Kawara; Kazushi Tanaka; Kenzo Hirao; Kazumasa Hiejima; Michael H. Lehmann
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.