Koichi Sagara

2.0k citations

67 papers · 1.4k indexed · h-index 22

Impact in

Cardiology and Cardiovascular Medicine top 2%
- Atrial Fibrillation Management and Outcomes
- Cardiac Arrhythmias and Treatments
- Cardiovascular Function and Risk Factors
- Cardiac electrophysiology and arrhythmias
- Heart Failure Treatment and Management
- Acute Myocardial Infarction Research
Internal Medicine top 5%
- Venous Thromboembolism Diagnosis and Management

Papers in ⓘ

Cardiology and Cardiovascular Medicine 62
- Atrial Fibrillation Management and Outcomes 35
- Cardiac Arrhythmias and Treatments 19
- Cardiac electrophysiology and arrhythmias 16
- Cardiovascular Function and Risk Factors 12
- Acute Myocardial Infarction Research 10
- Heart Failure Treatment and Management 9
- Cardiac pacing and defibrillation studies 9
Radiology, Nuclear Medicine and Imaging 11
- Cardiac Imaging and Diagnostics 9

Co-authors: Takeshi Yamashita (61 shared papers)Tadanori Aizawa (54 shared papers)Hitoshi Sawada (49 shared papers)Shinya Suzuki (50 shared papers)Hajime Kirigaya (42 shared papers)Junji Yajima (45 shared papers)Yuji Oikawa (45 shared papers)Kazuyuki Nagashima (43 shared papers)
Journals: Circulation Journal (17 papers)Journal of Cardiology (16 papers)Heart and Vessels (6 papers)Drug Metabolism and Pharmacokinetics (2 papers)Hypertension Research (2 papers)
Partner nations: Japan United States United Kingdom

In The Last Decade

Koichi Sagara

66 papers receiving 1.4k citations

Peers

Countries citing papers authored by Koichi Sagara

Since Specialization

Citations

This map shows the geographic impact of Koichi Sagara'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 Koichi Sagara with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Koichi Sagara more than expected).

Fields of papers citing papers by Koichi Sagara

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Koichi Sagara. 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 Koichi Sagara. The network helps show where Koichi Sagara may publish in the future.

Co-authors

The 25 scholars most cited alongside Koichi Sagara, 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 Koichi Sagara Line = papers co-authored together Koichi Sagara 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 67 papers — load more, or switch the sort, to bring in the rest.

#	Work
1	Recruitment of Immune Cells Across Atrial Endocardium in Human Atrial Fibrillation Circulation Journal ·Takeshi Yamashita, Akiko Sekiguchi, Yu‐ki Iwasaki, Taro Date, Koichi Sagara, Hiroaki Tanabe, Hisayoshi Suma, Hitoshi Sawada, Tadanori Aizawa	2010	156
2	Incidence of Major Bleeding Complication of Warfarin Therapy in Japanese Patients With Atrial Fibrillation Circulation Journal ·Shinya Suzuki, Takeshi Yamashita, Takeshi Kato, Tadashi Fujino, Koichi Sagara, Hitoshi Sawada, Tadanori Aizawa, Long-tai Fu	2007	79
3	Prevalence and Prognosis of Patients With Atrial Fibrillation in Japan Circulation Journal ·Shinya Suzuki, Takeshi Yamashita, Takayuki Ohtsuka, Koichi Sagara, Tokuhisa Uejima, Yuji Oikawa, Junji Yajima, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, K. OGASAWARA, Hitoshi Sawada, Tadanori Aizawa	2008	78
4	Brachial-ankle pulse wave velocity as a risk stratification index for the short-term prognosis of type 2 diabetic patients with coronary artery disease Hypertension Research ·(unknown), Michinari Nakamura, Takeshi Yamashita, Junji Yajima, Yuji Oikawa, Koichi Sagara, Akira Koike, Hajime Kirigaya, Kazuyuki Nagashima, Hitoshi Sawada, Tadanori Aizawa	2010	71
5	Gender-Specific Relationship Between Serum Uric Acid Level and Atrial Fibrillation Prevalence Circulation Journal ·Shinya Suzuki, Koichi Sagara, Takayuki Otsuka, Shunsuke Matsuno, Ryuichi Funada, Tokuhisa Uejima, Yuji Oikawa, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, Junji Yajima, Hitoshi Sawada, Tadanori Aizawa, Takeshi Yamashita	2011	58
6	Recent mortality of Japanese patients with atrial fibrillation in an urban city of Tokyo Journal of Cardiology ·Shinya Suzuki, Takeshi Yamashita, Takayuki Otsuka, Koichi Sagara, Tokuhisa Uejima, Yuji Oikawa, Junji Yajima, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, K. OGASAWARA, Hitoshi Sawada, Tadanori Aizawa	2011	55
7	Characteristics of Congestive Heart Failure Accompanied by Atrial Fibrillation With Special Reference to Tachycardia-Induced Cardiomyopathy Circulation Journal ·Tadashi Fujino, Takeshi Yamashita, Shinya Suzuki, Hiroaki Sugiyma, Koichi Sagara, Hitoshi Sawada, Tadanori Aizawa, Masaki Igarashi, Junichi Yamazaki	2007	47
8	Usefulness of Frequent Supraventricular Extrasystoles and a High CHADS2 Score to Predict First-Time Appearance of Atrial Fibrillation The American Journal of Cardiology ·Shinya Suzuki, Koichi Sagara, Takayuki Otsuka, Hiroto Kano, Shunsuke Matsuno, Hideaki Takai, Tokuhisa Uejima, Yuji Oikawa, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, Junji Yajima, Hiroaki Tanabe, Hitoshi Sawada, Tadanori Aizawa, Takeshi Yamashita	2013	47
9	Obesity paradox in Japanese patients after percutaneous coronary intervention: An observation cohort study Journal of Cardiology ·Hidehiro Kaneko, Junji Yajima, Yuji Oikawa, Shingo Tanaka, Daisuke Fukamachi, Shinya Suzuki, Koichi Sagara, Takayuki Otsuka, Shunsuke Matsuno, Ryuichi Funada, Hiroto Kano, Tokuhisa Uejima, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, Hitoshi Sawada, Tadanori Aizawa, Takeshi Yamashita	2013	42
10	Clinical characteristics and long-term clinical outcomes of Japanese heart failure patients with preserved versus reduced left ventricular ejection fraction: A prospective cohort of Shinken Database 2004–2011 Journal of Cardiology ·Hidehiro Kaneko, Shinya Suzuki, Junji Yajima, Yuji Oikawa, Koichi Sagara, Takayuki Otsuka, Shunsuke Matsuno, Hiroto Kano, Tokuhisa Uejima, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, Hitoshi Sawada, Tadanori Aizawa, Takeshi Yamashita	2013	39
11	Nine-Year Trend of Anticoagulation Use, Thromboembolic Events, and Major Bleeding in Patients With Non-Valvular Atrial Fibrillation　– Shinken Database Analysis – Circulation Journal ·Shinya Suzuki, Takayuki Otsuka, Koichi Sagara, Hiroaki Semba, Hiroto Kano, Shunsuke Matsuno, Hideaki Takai, Yuko Kato, Tokuhisa Uejima, Yuji Oikawa, Kazuyuki Nagashima, Hajime Kirigaya, Takashi Kunihara, Junji Yajima, Hitoshi Sawada, Tadanori Aizawa, Takeshi Yamashita	2016	39
12	A New Scoring System for Evaluating the Risk of Heart Failure Events in Japanese Patients With Atrial Fibrillation The American Journal of Cardiology ·Shinya Suzuki, Koichi Sagara, Takayuki Otsuka, Shunsuke Matsuno, Ryuichi Funada, Tokuhisa Uejima, Yuji Oikawa, Junji Yajima, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, Hitoshi Sawada, Tadanori Aizawa, Takeshi Yamashita	2012	33
13	Impact of aging on the clinical outcomes of Japanese patients with coronary artery disease after percutaneous coronary intervention Heart and Vessels ·Hidehiro Kaneko, Junji Yajima, Yuji Oikawa, Shingo Tanaka, Daisuke Fukamachi, Shinya Suzuki, Koichi Sagara, Takayuki Otsuka, Shunsuke Matsuno, Ryuichi Funada, Hiroto Kano, Tokuhisa Uejima, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, Hitoshi Sawada, Tadanori Aizawa, Takeshi Yamashita	2013	32
14	Endothelial–mesenchymal transition in human atrial fibrillation Journal of Cardiology ·Takeshi Kato, Akiko Sekiguchi, Koichi Sagara, Hiroaki Tanabe, Masayuki Takamura, Shuichi Kaneko, Tadanori Aizawa, Long-tai Fu, Takeshi Yamashita	2016	32
15	Incidence and Predictors of Rehospitalization of Acute Heart Failure Patients International Heart Journal ·Hidehiro Kaneko, Shinya Suzuki, Masato Goto, Takuto Arita, Yasufumi Yuzawa, Naoharu Yagi, Nobuhiro Murata, Yuko Kato, Hiroto Kano, Shunsuke Matsuno, Takayuki Otsuka, Tokuhisa Uejima, Yuji Oikawa, Koichi Sagara, Kazuyuki Nagashima, Hajime Kirigaya, Hitoshi Sawada, Tadanori Aizawa, Junji Yajima, Takeshi Yamashita	2015	29
16	Effects of statin treatment in patients with coronary artery disease and chronic kidney disease Heart and Vessels ·Hidehiro Kaneko, Junji Yajima, Yuji Oikawa, Shingo Tanaka, Daisuke Fukamachi, Shinya Suzuki, Koichi Sagara, Takayuki Otsuka, Shunsuke Matsuno, Ryuichi Funada, Hiroto Kano, Tokuhisa Uejima, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, Hitoshi Sawada, Tadanori Aizawa, Takeshi Yamashita	2013	26
17	Progression to the Persistent Form in Asymptomatic Paroxysmal Atrial Fibrillation Circulation Journal ·Keitaro Senoo, Shinya Suzuki, Takayuki Otsuka, Koichi Sagara, Shunsuke Matsuno, Hiroto Kano, Tokuhisa Uejima, Yuji Oikawa, Junji Yajima, Kazuyuki Nagashima, Hajime Kirigaya, Hitoshi Sawada, Tadanori Aizawa, Takeshi Yamashita	2014	24
18	Clinical outcome after acute coronary syndrome in Japanese patients: An observational cohort study Journal of Cardiology ·Michinari Nakamura, Takeshi Yamashita, Junji Yajima, Yuji Oikawa, K. OGASAWARA, Koichi Sagara, Hajime Kirigaya, Akira Koike, Kazuyuki Nagashima, Takayuki Ohtsuka, Tokuhisa Uejima, Shinya Suzuki, Hitoshi Sawada, Tadanori Aizawa	2009	23
19	Dabigatran in Clinical Practice for Atrial Fibrillation With Special Reference to Activated Partial Thromboplastin Time Circulation Journal ·Shinya Suzuki, Takayuki Otsuka, Koichi Sagara, Shunsuke Matsuno, Ryuichi Funada, Tokuhisa Uejima, Yuji Oikawa, Junji Yajima, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, Hitoshi Sawada, Tadanori Aizawa, Takeshi Yamashita	2012	23
20	Body Size and Atrial Fibrillation in Japanese Outpatients Circulation Journal ·Shinya Suzuki, Takeshi Yamashita, Takayuki Ohtsuka, Koichi Sagara, Tokuhisa Uejima, Yuji Oikawa, Junji Yajima, Akira Koike, Kazuyuki Nagashima, Hajime Kirigaya, K. OGASAWARA, Hitoshi Sawada, Tsutomu Yamazaki, Tadanori Aizawa	2009	23

About Koichi Sagara

Koichi Sagara is a scholar working on Cardiology and Cardiovascular Medicine, Radiology, Nuclear Medicine and Imaging, Surgery, Epidemiology and Complementary and alternative medicine, having authored 67 papers that have together received 1.4k indexed citations. Recurring topics across this work include Atrial Fibrillation Management and Outcomes (35 papers), Cardiac Arrhythmias and Treatments (19 papers), Cardiac electrophysiology and arrhythmias (16 papers), Cardiovascular Function and Risk Factors (12 papers), Acute Myocardial Infarction Research (10 papers), Heart Failure Treatment and Management (9 papers), Cardiac Imaging and Diagnostics (9 papers) and Cardiac pacing and defibrillation studies (9 papers). The work is most often cited by research in Cardiology and Cardiovascular Medicine (1.2k citations), Internal Medicine (127 citations), Nephrology (102 citations), Radiology, Nuclear Medicine and Imaging (199 citations) and Geriatrics and Gerontology (25 citations). Koichi Sagara has collaborated with scholars based in Japan, United States and United Kingdom. Frequent co-authors include Takeshi Yamashita, Tadanori Aizawa, Hitoshi Sawada, Shinya Suzuki, Hajime Kirigaya, Junji Yajima, Yuji Oikawa, Kazuyuki Nagashima, Tokuhisa Uejima and Akira Koike. Their work appears in journals such as Circulation Journal, Journal of Cardiology, Heart and Vessels, Drug Metabolism and Pharmacokinetics and Hypertension Research.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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