Full Text Journal Articles by
Author Kazuo Matsumoto

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Differential Atrial Pacing to Detect Reconnection Gaps After Pulmonary Vein Isolation in Atrial Fibrillation.

Mai Tahara, Ritsushi Kato, Yoshifumi Ikeda, Koji Goto, So Asano, Hitoshi Mori, Shiro Iwanaga, Toshihiro Muramatsu, Kazuo Matsumoto,

High-resolution mapping is useful to identify reconnection gaps in the pulmonary vein after pulmonary vein isolation for atrial fibrillation. However, it is sometimes difficult to differentiate pulmonary vein potentials from far-field potentials because of very low amplitudes. Our purpose was to evaluate the usefulness of a novel differential atrial pacing ... Read more >>

Int Heart J (International heart journal)
[2020, 61(3):503-509]

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A multicenter study on the clinical characteristics and risk factors of in-hospital mortality in patients with mechanical complications following acute myocardial infarction.

Yorihiko Koeda, Tomonori Itoh, Yu Ishikawa, Yoshihiro Morino, Tomohiro Mizutani, Junya Ako, Masataka Nakano, Koichiro Yoshioka, Yuji Ikari, Shu Inami, Masashi Sakuma, Isao Taguchi, Tetsuya Ishikawa, Hiroyuki Sugimura, Keiki Sugi, Kazuo Matsumoto, Takanobu Mitarai, Tomoyuki Kunishima, Yoshihiro J Akashi, Takahiro Nomura, Kei Fukushi, Hideaki Yoshino, ,

Mechanical complications (MCs) following acute myocardial infarction (AMI), such as ventricular septal rupture (VSR), free-wall rupture (FWR), and papillary muscle rupture (PMR), are fatal. However, the risk factors of in-hospital mortality among patients with MCs have not been previously reported in Japan. The purpose of this study was to evaluate ... Read more >>

Heart Vessels (Heart and vessels)
[2020, 35(8):1060-1069]

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Impact of high-density mapping on outcome of the second ablation for atrial fibrillation.

Yoshifumi Ikeda, Ritsushi Kato, Hitoshi Mori, Kenta Tsutsui, Koji Goto, Takahiko Nagase, Sayaka Tanaka, Sou Asano, Mai Tawara, Midori Yukino, Saki Hasegawa, Shintaro Nakano, Shiro Iwanaka, Toshihiro Muramatsu, Kazuo Matsumoto,

PURPOSE:Identification of a conduction gap between the left atrium and pulmonary vein (LA-PV gap) and the circuit of atrial tachycardia after pulmonary vein isolation (PVI) is an important process during the second ablation for atrial fibrillation (AF). The high-density mapping system RHYTHMIA® is useful for identification of an LA-PV gap ... Read more >>

J Interv Card Electrophysiol (Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing)
[2020, :]

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Percutaneous Simple Lead Traction Is a Feasible and Effective Method for Right Ventricular Lead Perforations.

Hitoshi Mori, Ritsushi Kato, Yoshifumi Ikeda, Kenta Tsutsui, Saki Hasegawa, Sayaka Tanaka, Shiro Iwanaga, Shintaro Nakano, Toshihiro Muramatsu, Naokata Sumitomo, Kazuo Matsumoto,

Right ventricular (RV) lead perforations are relatively rare but a potentially life-threatening complication of surgical implantations of cardiac implantable electronic devices (CIEDs). The result of percutaneous simple lead traction after lead perforations in the Japanese population has not been well clarified.We retrospectively studied 1359 patients (pacemakers [PMs], 973 patients; implantable ... Read more >>

Int Heart J (International heart journal)
[2020, 61(1):54-59]

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Influence of various energy settings and overlap ratios on size and continuity of lesions in a laser balloon ablation in vitro model.

Takahiko Nagase, So Asano, Midori Yukino, Hitoshi Mori, Koji Goto, Yoshifumi Ikeda, Shiro Iwanaga, Toshihiro Muramatsu, Hisamitsu Mukaida, Ritsushi Kato, Kazuo Matsumoto,

INTRODUCTION:The influence of power (Watt [W]) and total energy (Joule [J]) on lesion size and the optimal overlap ratio remain unclear in laser balloon (LB) ablation for atrial fibrillation. We aimed to evaluate lesion size and visible gaps after LB ablation with various energy settings and different overlap ratios in ... Read more >>

J. Cardiovasc. Electrophysiol. (Journal of cardiovascular electrophysiology)
[2019, 30(8):1330-1338]

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Relationship between the ablation index, lesion formation, and incidence of steam pops.

Hitoshi Mori, Ritsushi Kato, Naokata Sumitomo, Yoshifumi Ikeda, Koji Goto, Sayaka Tanaka, So Asano, Mai Tahara, Takahiko Nagase, Shiro Iwanaga, Toshihiro Muramatsu, Kazuo Matsumoto,

Background:The ablation index (AI) is reported to be useful for a durable pulmonary vein isolation (PVI). However, there have been no studies investigating the relationship between the power, contact force (CF), AI, and steam pops. Methods:Using an in vitro model, ablation energy was delivered until a steam pop occurred and ... Read more >>

J Arrhythm (Journal of arrhythmia)
[2019, 35(4):636-644]

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The effect of contact force during radiofrequency catheter ablation using a vibrating catheter: New cooling method for catheter ablation.

Kaihong Yu, Tetsui Yamashita, Shigeaki Shingyochi, Kazuo Matsumoto, Atsuki Komiya, Makoto Ohta,

BACKGROUND:A new cooling method is proposed for preventing electrode-tissue overheating during cardiac catheter ablation using a vibrating catheter. Previous work has shown that vibration that results from increased flow velocity around the catheter can have a cooling effect on the electrode. OBJECTIVE:Contact force has been shown to be an important ... Read more >>

Technol Health Care (Technology and health care : official journal of the European Society for Engineering and Medicine)
[2019, 27(6):589-601]

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Safety and accuracy of the Rhythmia mapping system in pediatric patients.

Hitoshi Mori, Shota Muraji, Naokata Sumitomo, Ritsushi Kato, Tomohiko Imamura, Akiko Komori, Noriyuki Iwashita, Toshiki Kobayashi, Kazuo Matsumoto,

BACKGROUND:A new mapping system (Rhythmia) using a 64 mini-electrode small basket array (Orion) was developed that enables rapid high-density mapping in a short time. However, there are few reports about the usefulness of this system in pediatric cases. OBJECTIVE:The purpose of this study was to investigate the safety and accuracy ... Read more >>

Heart Rhythm (Heart Rhythm)
[2019, 16(3):388-394]

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Phrenic nerve injury contemporaneous with acute decrease in compound motor action potential during laser balloon pulmonary vein isolation for atrial fibrillation.

Takahiko Nagase, So Asano, Koji Goto, Yoshifumi Ikeda, Ritsushi Kato, Kazuo Matsumoto,

HeartRhythm Case Rep (HeartRhythm case reports)
[2019, 5(2):83-87]

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Analysis of the heart rate variability during cryoballoon ablation of atrial fibrillation.

Hitoshi Mori, Ritsushi Kato, Yoshifumi Ikeda, Koji Goto, Sayaka Tanaka, So Asano, Yuichiro Shiki, Takahiko Nagase, Shiro Iwanaga, Shigeyuki Nishimura, Toshihiro Muramatsu, Kazuo Matsumoto,

Aims:Vagal responses such as marked bradycardia or a rapid blood pressure decrease are often observed during pulmonary vein (PV) isolation of atrial fibrillation (AF) using a cryoballoon (CB). However, the relationship between the marked vagal response and change in the heart rate variability (HRV) as a marker of the autonomic ... Read more >>

Europace (Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology)
[2018, 20(8):1259-1267]

Cited: 1 time

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The influence of the electrodes spacing of a mapping catheter on the atrial voltage substrate map.

Hitoshi Mori, Ritsushi Kato, Yoshifumi Ikeda, Koji Goto, Sayaka Tanaka, So Asano, Yuichiro Shiki, Takahiko Nagase, Mai Tahara, Shiro Iwanaga, Toshihiro Muramatsu, Kazuo Matsumoto,

BACKGROUND:Detailed substrate mapping is important for catheter ablation. However, the influence of the electrode spacing of the mapping catheter on the substrate map has not been well clarified. The aim of this study was to investigate the influence of the electrode spacing of the mapping catheter on the voltage of ... Read more >>

J Cardiol (Journal of cardiology)
[2018, 72(5):434-442]

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AF Sustained in Only a Small Area of SVC.

Takahiko Nagase, Ritsushi Kato, So Asano, Kazuo Matsumoto,

Intern. Med. (Internal medicine (Tokyo, Japan))
[2017, 56(16):2239-2240]

Cited: 1 time

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Safety and Efficacy of Cryoballoon Ablation for Paroxysmal Atrial Fibrillation in Japan - Results From the Japanese Prospective Post-Market Surveillance Study.

Ken Okumura, Kazuo Matsumoto, Yoshinori Kobayashi, Akihiko Nogami, Robert B Hokanson, Fred Kueffer, ,

Outcomes of cryoballoon ablation for paroxysmal atrial fibrillation (PAF) have been reported in the Western countries but not in Japan. The CRYO-Japan PMS study was a single-arm, observational, multicenter, prospective study of the 2nd-generation cryoballoon Arctic Front Advance(TM). We evaluated device- and procedure-related complications and clinical outcomes at 6 months.The ... Read more >>

Circ. J. (Circulation journal : official journal of the Japanese Circulation Society)
[2016, 80(8):1744-1749]

Cited: 4 times

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Identification of Covert Atrial Fibrillation in Cryptogenic Ischemic Stroke: Current Clinical Practice in Japan.

Kazunori Toyoda, Ken Okumura, Yoichiro Hashimoto, Takanori Ikeda, Takashi Komatsu, Teruyuki Hirano, Haruhisa Fukuda, Kazuo Matsumoto, Masahiro Yasaka,

A new insertable cardiac monitor, Reveal LINQ (Medtronic, Dublin, Ireland), was approved for clinical use in Japan in March 2016 for detecting atrial fibrillation in patients who develop ischemic stroke with no clearly definable etiology even after extensive workup, so-called cryptogenic ischemic stroke. Cooperation between a specialist of the Japan ... Read more >>

J Stroke Cerebrovasc Dis (Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association)
[2016, 25(8):1829-1837]

Cited: 3 times

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Regional Differences in Frequency of Warfarin Therapy and Thromboembolism in Japanese Patients With Non-Valvular Atrial Fibrillation - Analysis of the J-RHYTHM Registry.

Hiroshi Inoue, Hirotsugu Atarashi, Eitaro Kodani, Ken Okumura, Takeshi Yamashita, Hideki Origasa, Masayuki Sakurai, Yuichiro Kawamura, Isao Kubota, Kazuo Matsumoto, Yoshiaki Kaneko, Satoshi Ogawa, Yoshifusa Aizawa, Masaomi Chinushi, Itsuo Kodama, Eiichi Watanabe, Yukihiro Koretsune, Yuji Okuyama, Akihiko Shimizu, Osamu Igawa, Shigenobu Bando, Masahiko Fukatani, Tetsunori Saikawa, Akiko Chishaki, ,

The proportion of patients with atrial fibrillation (AF) treated with anticoagulation varies from country to country. In Japan, little is known about regional differences in frequency of warfarin use or prognosis among patients with non-valvular AF (NVAF).In J-RHYTHM Registry, the number of patients recruited from each of 10 geographic regions ... Read more >>

Circ. J. (Circulation journal : official journal of the Japanese Circulation Society)
[2016, 80(7):1548-1555]

Cited: 1 time

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Atypical Fast-Slow Atrioventricular Nodal Reentrant Tachycardia Incorporating a "Superior" Slow Pathway: A Distinct Supraventricular Tachyarrhythmia.

Yoshiaki Kaneko, Shigeto Naito, Kaoru Okishige, Itsuro Morishima, Takeshi Tobiume, Tadashi Nakajima, Tadanobu Irie, Masaki Ota, Takafumi Iijima, Takashi Iizuka, Mio Tamura, Shuntaro Tamura, Akihiro Saito, Osamu Igawa, Ritsushi Kato, Kazuo Matsumoto, Fumio Suzuki, Masahiko Kurabayashi,

The existence of an atypical fast-slow (F/S) atrioventricular nodal reentrant tachycardia (AVNRT) including a superior (sup) pathway with slow conductive properties and an atrial exit near the His bundle has not been confirmed.We studied 6 women and 2 men (age, 74 ± 7 years) with sup-F/S-AVNRT who underwent successful radiofrequency ... Read more >>

Circulation (Circulation)
[2016, 133(2):114-123]

Cited: 5 times

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Prediction of improvement in left atrial function index after catheter ablation for atrial fibrillation.

Takahiko Nagase, Ritsushi Kato, Shintaro Nakano, Yuichirou Shiki, Sayaka Tanaka, Yoshifumi Ikeda, Shiro Iwanaga, Shigeyuki Nishimura, Kazuo Matsumoto,

Although left atrial function index is reportedly a possible predictor of hospitalization for heart failure and of stroke irrespective of the presence or not of atrial fibrillation (AF), the effects of catheter ablation on left atrial function index have not yet been reported.We performed catheter ablation on 55 patients (age ... Read more >>

J Interv Card Electrophysiol (Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing)
[2015, 44(2):151-160]

Cited: 4 times

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Characteristics and catheter ablation of focal atrial tachycardia originating from the interatrial septum.

Yoshiaki Kaneko, 'Ritsushi Kato, Shiro Nakahara, Takeshi Tobiume, Itsuro Morishima, Kazuhiko Tanaka, Tadashi Nakajima, Tadanobu Irie, Kengo Fukushima Kusano, Shiro Kamakura, Takahiko Nagase, Kan Takayanagi, Kazuo Matsumoto, Masahiko Kurabayashi,

Ablation of focal atrial tachycardia (AT) originating from the interatrial septum (IAS) is challenging because of its complex anatomy.We studied the electrocardiographic and electrophysiologic characteristics of focal, septal AT in seven patients who underwent successful ablation.The site of successful ablation was at the site of earliest activation on the right ... Read more >>

Heart Lung Circ (Heart, lung & circulation)
[2015, 24(10):988-995]

Cited: 1 time

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Non-valvular atrial fibrillation patients with low CHADS2 scores benefit from warfarin therapy according to propensity score matching subanalysis using the J-RHYTHM Registry.

Akiko Chishaki, Naoko Kumagai, Naohiko Takahashi, Tetsunori Saikawa, Hiroshi Inoue, Ken Okumura, Hirotsugu Atarashi, Takeshi Yamashita, Hideki Origasa, Masayuki Sakurai, Yuichiro Kawamura, Isao Kubota, Kazuo Matsumoto, Yoshiaki Kaneko, Satoshi Ogawa, Yoshifusa Aizawa, Masaomi Chinushi, Itsuo Kodama, Eiichi Watanabe, Yukihiro Koretsune, Yuji Okuyama, Akihiko Shimizu, Osamu Igawa, Shigenobu Bando, Masahiko Fukatani, ,

Recently, direct-acting oral anticoagulants (DOACs) have been introduced, with increasing use in patients with non-valvular atrial fibrillation (NVAF). However, warfarin continues to be widely used and the benefits and risks of warfarin in NVAF patients warrant closer inspection.Thromboembolism, major hemorrhage, and total and cardiovascular mortalities were analyzed in 7,406 NVAF ... Read more >>

Thromb. Res. (Thrombosis research)
[2015, 136(2):267-273]

Cited: 1 time

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The lead structure does not always work as designed.

Kazuo Matsumoto, Tatsuo Ogino,

Circ. J. (Circulation journal : official journal of the Japanese Circulation Society)
[2014, 78(12):2834-2835]

Cited: 0 times

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Left atrial appendage wall-motion velocity associates with recurrence of nonparoxysmal atrial fibrillation after catheter ablation.

Miyuki Ariyama, Ritsushi Kato, Makoto Matsumura, Harumi Yoshimoto, Yoshie Nakajima, Shintaro Nakano, Takatoshi Kasai, Jun Tanno, Takaaki Senbonmatsu, Kazuo Matsumoto, Shigeyuki Nishimura,

Catheter ablation (CA) for nonparoxysmal atrial fibrillation (AF) is controversial due to its high recurrence rate. The aim of this study was to assess retrospectively the diagnostic value of preprocedural left atrial appendage (LAA) wall-motion velocity in predicting recurrence of AF within 1 year after CA. We hypothesized that tissue ... Read more >>

Echocardiography (Echocardiography (Mount Kisco, N.Y.))
[2015, 32(2):272-280]

Cited: 2 times

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Impacts of patient characteristics on the effectiveness of landiolol in AF/AFL patients complicated with LV dysfunction: Subgroup analysis of the J-Land study.

Koichiro Kinugawa, Ryozo Nagai, Hiroshi Inoue, Hirotsugu Atarashi, Yoshihiko Seino, Takeshi Yamashita, Wataru Shimizu, Takeshi Aiba, Masafumi Kitakaze, Atsuhiro Sakamoto, Takanori Ikeda, Yasushi Imai, Takashi Daimon, Katsuhiro Fujino, Tetsuji Nagano, Tatsuaki Okamura, Masatsugu Hori, ,

Results from the multicenter trial (J-Land study) of landiolol versus digoxin in atrial fibrillation (AF) and atrial flutter (AFL) patients with left ventricular (LV) dysfunction revealed that landiolol was more effective for controlling rapid HR than digoxin. The subgroup analysis for patient characteristics was conducted to evaluate the impact on ... Read more >>

Adv Ther (Advances in therapy)
[2014, 31(4):426-439]

Cited: 3 times

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[Chapter 4. Transitions in pharmaceutical market, production and sales in Japan (1980-2010)].

Ryuzo Yoshioka, Kazuo Matsumoto,

In this paper, the writers reviewed in detail the pharmaceutical market and the shifts in manufacturing and sales including the trade balance in Japan over a thirty-year period from 1980 to 2010. From the 1980s to the 1990s, many innovative pharmaceutical products were developed and launched in the Japanese market. ... Read more >>

Yakushigaku Zasshi (Yakushigaku zasshi)
[2014, 49(1):64-76]

Cited: 0 times

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[Chapter 2. Transitions in drug-discovery technology and drug-development in Japan (1980-2010)].

Noriko Sakakibara, Ryuzo Yoshioka, Kazuo Matsumoto,

In 1970s, the material patent system was introduced in Japan. Since then, many Japanese pharmaceutical companies have endeavored to create original in-house products. From 1980s, many of the innovative products were small molecular drugs and were developed using powerful medicinal-chemical technologies. Among them were antibiotics and effective remedies for the ... Read more >>

Yakushigaku Zasshi (Yakushigaku zasshi)
[2014, 49(1):39-49]

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Impact of gender on the prognosis of patients with nonvalvular atrial fibrillation.

Hiroshi Inoue, Hirotsugu Atarashi, Ken Okumura, Takeshi Yamashita, Hideki Origasa, Naoko Kumagai, Masayuki Sakurai, Yuichiro Kawamura, Isao Kubota, Kazuo Matsumoto, Yoshiaki Kaneko, Satoshi Ogawa, Yoshifusa Aizawa, Masaomi Chinushi, Itsuo Kodama, Eiichi Watanabe, Yukihiro Koretsune, Yuji Okuyama, Akihiko Shimizu, Osamu Igawa, Shigenobu Bando, Masahiko Fukatani, Tetsunori Saikawa, Akiko Chishaki, ,

Treatment guidelines for atrial fibrillation (AF) used in Western countries describe female gender as a risk factor for thromboembolic events in patients with nonvalvular AF (NVAF). The present study aimed to determine the impact of gender on prognosis of Japanese patients with NVAF. A subanalysis of 7,406 patients with NVAF ... Read more >>

Am. J. Cardiol. (The American journal of cardiology)
[2014, 113(6):957-962]

Cited: 21 times

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