Ryuichi Kai

1.8k total citations · 1 hit paper
9 papers, 1.3k citations indexed

About

Ryuichi Kai is a scholar working on Cardiology and Cardiovascular Medicine, Radiology, Nuclear Medicine and Imaging and Surgery. According to data from OpenAlex, Ryuichi Kai has authored 9 papers receiving a total of 1.3k indexed citations (citations by other indexed papers that have themselves been cited), including 6 papers in Cardiology and Cardiovascular Medicine, 3 papers in Radiology, Nuclear Medicine and Imaging and 2 papers in Surgery. Recurrent topics in Ryuichi Kai's work include Takotsubo Cardiomyopathy and Associated Phenomena (2 papers), Kawasaki Disease and Coronary Complications (2 papers) and Atrial Fibrillation Management and Outcomes (2 papers). Ryuichi Kai is often cited by papers focused on Takotsubo Cardiomyopathy and Associated Phenomena (2 papers), Kawasaki Disease and Coronary Complications (2 papers) and Atrial Fibrillation Management and Outcomes (2 papers). Ryuichi Kai collaborates with scholars based in Japan. Ryuichi Kai's co-authors include Mafumi Owa, Kazuo Haze, Nobuhiro Ohmura, Takashi Honda, Shunichi Miyazaki, Kazuo Kimura, Hisao Ogawa, Mamoru Hase, Isao Morii and Minoru Yoshiyama and has published in prestigious journals such as Journal of the American College of Cardiology, American Journal of Respiratory and Critical Care Medicine and American Heart Journal.

In The Last Decade

Ryuichi Kai

8 papers receiving 1.2k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Transient left ventricular apical ballooning without coronary artery stenosis: a novel heart syndrome mimicking acute myocardial infarction

2001 1.1k citations Kazufumi Tsuchihashi, Kenji Ueshima et al. Journal of the American College of Cardiology profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Ryuichi Kai Japan	6	1.2k	745	385	132	129	9	1.3k
Rajesh Hiralal Canada	4	1.1k 0.9×	606 0.8×	357 0.9×	165 1.3×	118 0.9×	6	1.2k
Riccardo Ieva Italy	15	790 0.7×	350 0.5×	242 0.6×	39 0.3×	53 0.4×	73	895
Nobuhiro Ohmura Japan	7	1.2k 1.1×	758 1.0×	411 1.1×	131 1.0×	127 1.0×	9	1.3k
Rasmus Borgquist Sweden	18	971 0.8×	234 0.3×	134 0.3×	42 0.3×	31 0.2×	84	1.1k
Bong Gun Song South Korea	13	384 0.3×	163 0.2×	167 0.4×	30 0.2×	32 0.2×	42	486
Hidetoshi Yoshitani Japan	20	1.0k 0.9×	603 0.8×	289 0.8×	20 0.2×	21 0.2×	50	1.2k
Gerardo Ansalone Italy	19	1.6k 1.4×	282 0.4×	261 0.7×	9 0.1×	181 1.4×	66	1.7k
Dong‐In Shin Germany	17	1.2k 1.0×	130 0.2×	110 0.3×	8 0.1×	52 0.4×	91	1.3k
Raymond Tukkie Netherlands	17	1.5k 1.3×	110 0.1×	214 0.6×	8 0.1×	33 0.3×	52	1.7k
Timothy Woods United States	10	286 0.2×	87 0.1×	207 0.5×	16 0.1×	106 0.8×	23	680

Countries citing papers authored by Ryuichi Kai

Since Specialization

Citations

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

Fields of papers citing papers by Ryuichi Kai

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Ryuichi Kai

This figure shows the co-authorship network connecting the top 25 collaborators of Ryuichi Kai. A scholar is included among the top collaborators of Ryuichi Kai 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 Ryuichi Kai. Ryuichi Kai is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

9 of 9 papers shown

1.

Toyofuku, Mamoru, Junichi Tazaki, Tomoya Kimura, et al.. (2025). Validation for the Diagnostic Use of the HEART Score in Patients With Acute Chest Pain in Japan. Circulation Reports. 7(7). 547–553.

2.

Kai, Ryuichi, Hiroshi Imamura, Jun Koyama, et al.. (2006). Temporary inferior vena cava filter for deep vein thrombosis and acute pulmonary thromboembolism: effectiveness and indication. Heart and Vessels. 21(4). 221–225. 9 indexed citations

3.

Kinoshita, Osamu, Takeshi Tomita, Ryuichi Kai, et al.. (2005). Large Saccular Aneurysm in a Coronary Arterial Fistula. Angiology. 56(2). 233–235. 5 indexed citations

4.

Imamura, Hiroshi, Atsushi Izawa, Ryuichi Kai, et al.. (2004). Trends Over the Last 20 Years in the Clinical Background of Young Japanese Patients With Coronary Artery Disease. Circulation Journal. 68(3). 186–191. 22 indexed citations

5.

Hongo, Minoru, Kazuhisa Urushibata, Ryuichi Kai, et al.. (2002). Iodine-123 metaiodobenzylguanidine scintigraphic analysis of myocardial sympathetic innervation in patients with AL (primary) amyloidosis. American Heart Journal. 144(1). 122–129. 39 indexed citations

6.

Tsuchihashi, Kazufumi, Kenji Ueshima, Tatsuro Uchida, et al.. (2001). Transient left ventricular apical ballooning without coronary artery stenosis: a novel heart syndrome mimicking acute myocardial infarction. Journal of the American College of Cardiology. 38(1). 11–18. 1145 indexed citations breakdown →

7.

Kai, Ryuichi, Takanori Yasu, Masashi Fujii, et al.. (2001). [Apical ballooning by transient left ventricular dysfunction (so-called "ampulla" cardiomyopathy) associated with therapy for acute pulmonary thromboembolism: a case report].. PubMed. 38(1). 41–6. 7 indexed citations

8.

Okubo, Yoshio, Ryuichi Kai, Etsuro Sato, et al.. (1995). Adhesion Molecules on Eosinophils in Acute Eosinophilic Pneumonia. American Journal of Respiratory and Critical Care Medicine. 151(4). 1259–1262. 25 indexed citations

9.

Itoh, Atsuko, T. Kasuga, Minoru Hasegawa, et al.. (1995). [123I-MIBG myocardial SPECT in two patients with familial amyloid polyneuropathy].. PubMed. 32(10). 1113–6. 1 indexed citations

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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