Masaki Okajima

944 total citations
48 papers, 655 citations indexed

About

Masaki Okajima is a scholar working on Cardiology and Cardiovascular Medicine, Surgery and Physiology. According to data from OpenAlex, Masaki Okajima has authored 48 papers receiving a total of 655 indexed citations (citations by other indexed papers that have themselves been cited), including 19 papers in Cardiology and Cardiovascular Medicine, 8 papers in Surgery and 7 papers in Physiology. Recurrent topics in Masaki Okajima's work include Cardiac electrophysiology and arrhythmias (8 papers), Cardiac Arrest and Resuscitation (7 papers) and Heart Rate Variability and Autonomic Control (5 papers). Masaki Okajima is often cited by papers focused on Cardiac electrophysiology and arrhythmias (8 papers), Cardiac Arrest and Resuscitation (7 papers) and Heart Rate Variability and Autonomic Control (5 papers). Masaki Okajima collaborates with scholars based in Japan, Canada and United States. Masaki Okajima's co-authors include Masayuki Takamura, Takumi Taniguchi, Shuichi Kaneko, Koji Sato, Hiroshi Furusho, Wataru Omi, Hideo Inaba, Shigeo Takata, Toru Noda and Soichiro Usui and has published in prestigious journals such as SHILAP Revista de lepidopterología, The Journal of Physiology and Biochemical and Biophysical Research Communications.

In The Last Decade

Masaki Okajima

44 papers receiving 640 citations

Peers

Countries citing papers authored by Masaki Okajima

Since Specialization

Citations

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

Fields of papers citing papers by Masaki Okajima

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Masaki Okajima

This figure shows the co-authorship network connecting the top 25 collaborators of Masaki Okajima. A scholar is included among the top collaborators of Masaki Okajima based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Masaki Okajima. Masaki Okajima is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	Impact of the COVID-19 pandemic on prehospital characteristics and outcomes of out-of-hospital cardiac arrest among the elderly in Japan: A nationwide study 2023 ·Resuscitation Plus ·Yoshio Tanaka, (unknown), (unknown), Masaki Okajima, Hideo Inaba	4
2	Case Report: Myocarditis Associated With COVID-19 mRNA Vaccination Following Myocarditis Associated With Campylobacter Jejuni 2022 ·Frontiers in Cardiovascular Medicine ·Nobuko Kojima, (unknown), Hirofumi Okada, Shohei Yoshida, Kenji Sakata, Soichiro Usui, Hiroko Ikeda, Masaki Okajima, Masa‐aki Kawashiri, Masayuki Takamura	8
3	Early Detection of Symptom Exacerbation in Patients With SARS-CoV-2 Infection Using the Fitbit Charge 3 (DEXTERITY): Pilot Evaluation 2021 ·JMIR Formative Research ·(unknown), Akihiro Nomura, Mitsuhiro Kometani, Masaya Shimojima, Kenji Sakata, Soichiro Usui, (unknown), Masayuki Takamura, Masaki Okajima, Kazuyoshi Watanabe, Takashi Yoneda	8
4	Immunological and Preventive Effects of Hochuekkito and Kakkonto Against Coronavirus Disease in Healthcare Workers: A Retrospective Observational Study 2021 ·Frontiers in Pharmacology ·Keiko Ogawa‐Ochiai, Hideki Ishikawa, Hongyang Li, (unknown), (unknown), Mitsuyuki Takamura, (unknown), (unknown), Susumu Suzuki, Masaki Okajima, Keita Mori, Masanori Ito, Akiyoshi Takami	4
5	Impact of patient characteristics on the efficacy and safety of landiolol in patients with sepsis-related tachyarrhythmia: Subanalysis of the J-Land 3S randomised controlled study 2020 ·EClinicalMedicine ·Naoyuki Matsuda, Osamu Nishida, Takumi Taniguchi, Masaki Okajima, Hiroshi Morimatsu, Hiroshi Ogura, Yoshitsugu Yamada, (unknown), Akira Ichikawa, Yasuyuki Kakihana	6
6	Severe intoxication caused by sodium-glucose cotransporter 2 inhibitor overdose: a case report 2020 ·BMC Pharmacology and Toxicology ·(unknown), Junya Nakade, Tadashi Toyama, Masaki Okajima, Takumi Taniguchi	5
7	Nafamostat mesylate-induced hyperkalemia in critically ill patients with COVID-19: Four case reports 2020 ·World Journal of Clinical Cases ·Masaki Okajima, Y. Takahashi, (unknown), (unknown), (unknown)	13
8	Sphigosine-1-phosphate receptor 1 promotes neointimal hyperplasia in a mouse model of carotid artery injury 2019 ·Biochemical and Biophysical Research Communications ·(unknown), Soichiro Usui, Shinichiro Takashima, (unknown), (unknown), (unknown), Kazuaki Yoshioka, Masaki Okajima, Shuichi Kaneko, Yoh Takuwa, Masayuki Takamura	13
9	Usefulness of continuous electroencephalography in severe heat stroke complicated with multi-organ failure: a case report 2016 ·(unknown), Masaki Okajima, (unknown), Koji Sato, (unknown), (unknown), (unknown)	1
10	Sodium 4-Phenylbutyrate Attenuates Myocardial Reperfusion Injury by Reducing the Unfolded Protein Response 2016 ·Journal of Cardiovascular Pharmacology and Therapeutics ·(unknown), Soichiro Usui, Masaki Okajima, Shuichi Kaneko, (unknown), Shinichiro Takashima, Daisuke Kobayashi, Hisayoshi Murai, Hiroshi Furusho, Masayuki Takamura	16
11	Landiolol, an ultra-short-acting β1-blocker, is useful for managing supraventricular tachyarrhythmias in sepsis 2015 ·World Journal of Critical Care Medicine ·Masaki Okajima, Masayuki Takamura, Takumi Taniguchi	30
12	Olprinone, phosphodiesterase III inhibitor, is useful for patients with severe acute heart failure due to takotsubo cardiomyopathy accompanied by subarachnoid hemorrhage 2013 ·Acute Medicine & Surgery ·Masaki Okajima, (unknown), Toru Noda, Takumi Taniguchi	1
13	Attitudes toward automated external defibrillator use in Japan in 2011 2013 ·Journal of Anesthesia ·Takumi Taniguchi, Koji Sato, (unknown), Toru Noda, Masaki Okajima	13
14	Magnetic resonance imaging in a patient with an implantable cardiac defibrillator 2012 ·SHILAP Revista de lepidopterología ·Hiroshi Furusho, Takashi Kusayama, (unknown), Daisuke Kobayashi, Hisayoshi Murai, Soichiro Usui, Masaki Okajima, Shuichi Kaneko, Masakazu Yamagishi, Masayuki Takamura	0
15	Attitudes to Bystander Cardiopulmonary Resuscitation in Japan in 2010 2012 ·Circulation Journal ·Takumi Taniguchi, Koji Sato, Takashi Fujita, Masaki Okajima, Masayuki Takamura	42
16	Benidipine reduces ischemia reperfusion-induced systemic oxidative stress through suppression of aldosterone production in mice 2011 ·Hypertension Research ·Keisuke Ohtani, Soichiro Usui, Shuichi Kaneko, Shinichiro Takashima, (unknown), Kanako Yamamoto, Masaki Okajima, Hiroshi Furusho, Masayuki Takamura	10
17	Augmented single‐unit muscle sympathetic nerve activity in heart failure with chronic atrial fibrillation 2011 ·The Journal of Physiology ·Tatsunori Ikeda, Hisayoshi Murai, Shuichi Kaneko, Soichiro Usui, Daisuke Kobayashi, (unknown), Keiko Ikeda, Shinichiro Takashima, Takeshi Kato, Masaki Okajima, Hiroshi Furusho, Masayuki Takamura	22
18	PE-029 Responsiveness to Left Atrial Volume Reduction after Left Atrial Catheter Ablation for Paroxysmal Atrial Fibrillation : Evaluation by 16-MDCT(Arrhythmia, diagnosis/pathophysiology/EPS-7 (A) PE5,Poster Session (English),The 70th Anniversary Annual Scientific Meeting of the Japanese Circulation Society) 2006 ·Japanese Circulation Journal-english Edition ·Hiroshi Furusho, (unknown), (unknown), (unknown), (unknown), Hisayoshi Murai, Masaki Okajima, (unknown), Masayuki Takamura, Shigeo Takata, Satoru Sakagami	4
19	Pathophysiological plasma ET-1 levels antagonize β-adrenergic dilation of coronary resistance vessels in conscious dogs 2004 ·American Journal of Physiology-Heart and Circulatory Physiology ·Masaki Okajima, (unknown), Éric Thorin, Michel Lavallée	4
20	Frequency of premature beats in 715 healthy adult subjects. 1960 ·PubMed ·Masaki Okajima, (unknown), E. Simonson	8

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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