Koichiro Ejima

1.1k citations

69 papers · 618 indexed · h-index 14

Impact in

Cardiology and Cardiovascular Medicine top 5%
- Cardiac Arrhythmias and Treatments
- Atrial Fibrillation Management and Outcomes
- Cardiac pacing and defibrillation studies
- Cardiac electrophysiology and arrhythmias
- Cardiovascular Function and Risk Factors
- Cardiomyopathy and Myosin Studies
Internal Medicine

Papers in ⓘ

Cardiology and Cardiovascular Medicine 64
- Cardiac Arrhythmias and Treatments 46
- Atrial Fibrillation Management and Outcomes 32
- Cardiac pacing and defibrillation studies 32
- Cardiac electrophysiology and arrhythmias 25
- Cardiovascular Function and Risk Factors 9
- Cardiomyopathy and Myosin Studies 7
- Cardiac Valve Diseases and Treatments 4
Surgery 6

Co-authors: Morio Shoda (64 shared papers)Nobuhisa Hagiwara (51 shared papers)Daigo Yagishita (37 shared papers)Tetsuyuki Manaka (22 shared papers)Kotaro Arai (9 shared papers)Kyomi Ashihara (9 shared papers)Satoshi Higuchi (24 shared papers)Keiko Fukushima (5 shared papers)
Journals: Journal of Cardiovascular Electrophysiology (10 papers)Heart and Vessels (9 papers)EP Europace (5 papers)Pacing and Clinical Electrophysiology (3 papers)The American Journal of Cardiology (3 papers)
Partner nations: Japan United States

In The Last Decade

Koichiro Ejima

65 papers receiving 609 citations

Peers

Countries citing papers authored by Koichiro Ejima

Since Specialization

Citations

This map shows the geographic impact of Koichiro Ejima's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Koichiro Ejima with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Koichiro Ejima more than expected).

Fields of papers citing papers by Koichiro Ejima

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Koichiro Ejima. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Koichiro Ejima. The network helps show where Koichiro Ejima may publish in the future.

Co-authors

The 25 scholars most cited alongside Koichiro Ejima, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Koichiro Ejima Line = papers co-authored together Koichiro Ejima links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

Showing the 20 most-cited of 69 papers — load more, or switch the sort, to bring in the rest.

#	Work
1	Correlation between left atrial appendage morphology and flow velocity in patients with paroxysmal atrial fibrillation European Heart Journal - Cardiovascular Imaging ·Keiko Fukushima, Noritoshi Fukushima, Ken Kato, Koichiro Ejima, Hiroki Sato, Kenji Fukushima, Chihiro Saito, Keiko Hayashi, Kotaro Arai, Tetsuyuki Manaka, Kyomi Ashihara, Morio Shoda, Nobuhisa Hagiwara	2015	76
2	Prevalence and Persistence of Depression in Patients with Implantable Cardioverter Defibrillator: A 2‐year Longitudinal Study Pacing and Clinical Electrophysiology ·Tsuyoshi Suzuki, Tsuyoshi Shiga, Kazue Kuwahara, Sayaka Kobayashi, Shinichi Suzuki, Katsuji Nishimura, Atsushi Suzuki, Koichiro Ejima, Tetsuyuki Manaka, Morio Shoda, Jun Ishigooka, Hiroshi Kasanuki, Nobuhisa Hagiwara	2010	47
3	Impact of an Empiric Isolation of the Superior Vena Cava in Addition to Circumferential Pulmonary Vein Isolation on the Outcome of Paroxysmal Atrial Fibrillation Ablation The American Journal of Cardiology ·Koichiro Ejima, Ken Kato, Yuji Iwanami, Ryuta Henmi, Daigo Yagishita, Tetsuyuki Manaka, Keiko Fukushima, Kotaro Arai, Kyomi Ashihara, Morio Shoda, Nobuhisa Hagiwara	2015	39
4	Impedance drop predicts acute electrical reconnection of the pulmonary vein-left atrium after pulmonary vein isolation using short-duration high-power exposure Journal of Interventional Cardiac Electrophysiology ·Kyoichiro Yazaki, Koichiro Ejima, Miwa Kanai, Shohei Kataoka, Satoshi Higuchi, Daigo Yagishita, Morio Shoda, Nobuhisa Hagiwara	2020	31
5	Left Atrial Appendage Flow Velocity and Time from P‐Wave Onset to Tissue Doppler–Derived A' Predict Atrial Fibrillation Recurrence after Radiofrequency Catheter Ablation Echocardiography ·Keiko Fukushima, Noritoshi Fukushima, Koichiro Ejima, Ken Kato, Yasuto Sato, Shoko Uematsu, Kotaro Arai, Tetsuyuki Manaka, Atsushi Takagi, Kyomi Ashihara, Morio Shoda, Nobuhisa Hagiwara	2014	27
6	Impact of Atrial Remodeling on the Outcome of Radiofrequency Catheter Ablation of Paroxysmal Atrial Fibrillation Circulation Journal ·Koichiro Ejima, Ken Kato, Kotaro Arai, Keiko Fukushima, Noritoshi Fukushima, Tsuyoshi Suzuki, Kentaro Yoshida, Toshiaki Nuki, Shoko Uematsu, H Hoshi, Tetsuyuki Manaka, Kyomi Ashihara, Morio Shoda, Nobuhisa Hagiwara	2014	26
7	Comparison of high‐power and conventional‐power radiofrequency energy deliveries in pulmonary vein isolation using unipolar signal modification as a local endpoint Journal of Cardiovascular Electrophysiology ·Koichiro Ejima, Satoshi Higuchi, Kyoichiro Yazaki, Shohei Kataoka, Daigo Yagishita, Miwa Kanai, Morio Shoda, Nobuhisa Hagiwara	2020	24
8	Impact of diastolic dysfunction on the outcome of catheter ablation in patients with atrial fibrillation International Journal of Cardiology ·Koichiro Ejima, Morio Shoda, Kotaro Arai, Atsushi Suzuki, Daigo Yagishita, Yoshimi Yagishita, Bun Yashiro, Takahiro Sato, Tetsuyuki Manaka, Kyomi Ashihara, Nobuhisa Hagiwara	2011	19
9	Image integration of three-dimensional cone-beam computed tomography angiogram into electroanatomical mapping system to guide catheter ablation of atrial fibrillation EP Europace ·Koichiro Ejima, Morio Shoda, Daigo Yagishita, Keisuke Futagawa, Bun Yashiro, Takahiro Sato, Tetsuyuki Manaka, Takahito Nakajima, Hiroya Ohmori, N Hagiwara	2009	17
10	Methicillin Resistant Staphylococcus Aureus Infection of Implantable Antiarrhythmic Device Circulation ·Toru Satoh, Masataka Shoda, Kohei Tanizaki, Hirotaka Kawarai, Youichi Ajiro, Kenichiro Takahashi, Koichiro Ejima, Noritsugu Hagiwara, H Kasanuki	2005	16
11	Long-term outcome and preprocedural predictors of atrial tachyarrhythmia recurrence following pulmonary vein antrum isolation-based catheter ablation in patients with non-paroxysmal atrial fibrillation Journal of Cardiology ·Koichiro Ejima, Kotaro Arai, Tsuyoshi Suzuki, Ken Kato, Kentaro Yoshida, Toshiaki Nuki, Futoshi Suzuki, Shoko Uematsu, Keiko Fukushima, H Hoshi, Tetsuyuki Manaka, Kyomi Ashihara, Morio Shoda, Nobuhisa Hagiwara	2013	16
12	Comparison of the Efficacy of Empiric Thoracic Vein Isolation for the Treatment of Paroxysmal and Persistent Atrial Fibrillation in Patients Without Structural Heart Disease Journal of Cardiovascular Electrophysiology ·Koichiro Ejima, Ryuta Henmi, Yuji Iwanami, Daigo Yagishita, Morio Shoda, Nobuhisa Hagiwara	2017	16
13	Catheter ablation of atrial fibrillation in patients with severely impaired left ventricular systolic function Heart and Vessels ·Ken Kato, Koichiro Ejima, Noritoshi Fukushima, Makoto Ishizawa, Osamu Wakisaka, Ryuta Henmi, Kentaro Yoshida, Toshiaki Nuki, Kotaro Arai, Bun Yashiro, Tetsuyuki Manaka, Kyomi Ashihara, Morio Shoda, Nobuhisa Hagiwara	2015	14
14	Time interval from left ventricular stimulation to QRS onset is a novel predictor of nonresponse to cardiac resynchronization therapy Heart Rhythm ·Daigo Yagishita, Morio Shoda, Yoshimi Yagishita, Koichiro Ejima, Nobuhisa Hagiwara	2018	14
15	Implantable cardioverter defibrillator therapy and sudden death risk stratification in hypertrophic cardiomyopathy patients with midventricular obstruction: A single-center experience International Journal of Cardiology ·Ryozo Maeda, Yuichiro Minami, Shintaro Haruki, Keigo Kanbayashi, Ryosuke Itani, Atsushi Suzuki, Koichiro Ejima, Tsuyoshi Shiga, Morio Shoda, Nobuhisa Hagiwara	2016	13
16	Targeted endomyocardial biopsy using electroanatomical voltage mapping in the early stage of arrhythmogenic right ventricular cardiomyopathy EP Europace ·Koichiro Ejima, Morio Shoda, Tetsuyuki Manaka, Noritsugu Hagiwara	2009	13
17	Comparison Between Contact Force Monitoring and Unipolar Signal Modification as a Guide for Catheter Ablation of Atrial Fibrillation Circulation Arrhythmia and Electrophysiology ·Koichiro Ejima, Ken Kato, Ayako Okada, Osamu Wakisaka, Ryusuke Kimura, Makoto Ishizawa, Taku Imai, Yuko Toyama, Morio Shoda, Nobuhisa Hagiwara	2019	11
18	Impact of renal dysfunction on appropriate therapy in implantable cardioverter defibrillator patients with non-ischaemic dilated cardiomyopathy EP Europace ·Atsushi Takahashi, Tsuyoshi Shiga, Morio Shoda, Tetsuyuki Manaka, Koichiro Ejima, Nobuhisa Hagiwara	2009	10
19	Long-term clinical course after catheter ablation of atrial fibrillation in patients with hypertrophic cardiomyopathy Heart and Vessels ·Satoshi Higuchi, Koichiro Ejima, Yuichiro Minami, Kenjiro Ooyabu, Yuji Iwanami, Daigo Yagishita, Morio Shoda, Nobuhisa Hagiwara	2018	9
20	Impact of a prolonged interatrial conduction time for predicting the recurrence of atrial fibrillation after circumferential pulmonary vein isolation of persistent atrial fibrillation Heart and Vessels ·Satoshi Higuchi, Koichiro Ejima, Morio Shoda, Eri Yamamoto, Yuji Iwanami, Daigo Yagishita, Nobuhisa Hagiwara	2018	9

About Koichiro Ejima

Koichiro Ejima is a scholar working on Cardiology and Cardiovascular Medicine, Surgery, Epidemiology, Pulmonary and Respiratory Medicine and Radiology, Nuclear Medicine and Imaging, having authored 69 papers that have together received 618 indexed citations. Recurring topics across this work include Cardiac Arrhythmias and Treatments (46 papers), Atrial Fibrillation Management and Outcomes (32 papers), Cardiac pacing and defibrillation studies (32 papers), Cardiac electrophysiology and arrhythmias (25 papers), Cardiovascular Function and Risk Factors (9 papers), Cardiomyopathy and Myosin Studies (7 papers), Congenital Heart Disease Studies (4 papers) and Cardiac Valve Diseases and Treatments (4 papers). The work is most often cited by research in Cardiology and Cardiovascular Medicine (572 citations), Internal Medicine (20 citations), Radiology, Nuclear Medicine and Imaging (55 citations), Epidemiology (58 citations) and Pulmonary and Respiratory Medicine (34 citations). Koichiro Ejima has collaborated with scholars based in Japan and United States. Frequent co-authors include Morio Shoda, Nobuhisa Hagiwara, Daigo Yagishita, Tetsuyuki Manaka, Kotaro Arai, Kyomi Ashihara, Satoshi Higuchi, Keiko Fukushima, Noritoshi Fukushima and Yuji Iwanami. Their work appears in journals such as Journal of Cardiovascular Electrophysiology, Heart and Vessels, EP Europace, Pacing and Clinical Electrophysiology and The American Journal of Cardiology.

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