Ryoji Ichijima

681 total citations · 1 hit paper
38 papers, 449 citations indexed

About

Ryoji Ichijima is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Gastroenterology. According to data from OpenAlex, Ryoji Ichijima has authored 38 papers receiving a total of 449 indexed citations (citations by other indexed papers that have themselves been cited), including 24 papers in Surgery, 22 papers in Pulmonary and Respiratory Medicine and 19 papers in Gastroenterology. Recurrent topics in Ryoji Ichijima's work include Gastric Cancer Management and Outcomes (18 papers), Metastasis and carcinoma case studies (10 papers) and Gastrointestinal Tumor Research and Treatment (10 papers). Ryoji Ichijima is often cited by papers focused on Gastric Cancer Management and Outcomes (18 papers), Metastasis and carcinoma case studies (10 papers) and Gastrointestinal Tumor Research and Treatment (10 papers). Ryoji Ichijima collaborates with scholars based in Japan, United States and Taiwan. Ryoji Ichijima's co-authors include Hisatomo Ikehara, Sho Suzuki, Chika Kusano, Takuji Gotoda, Koichi Kawabe, Masashi Kawamura, Hirotaka Ito, Masahiko Ohtaka, Motoki Ohyauchi and Yohei Ogata and has published in prestigious journals such as SHILAP Revista de lepidopterología, Gastroenterology and Gut.

In The Last Decade

Ryoji Ichijima

36 papers receiving 448 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.

Seven-day vonoprazan and low-dose amoxicillin dual therapy as first-line Helicobacter pylori treatment: a multicentre randomised trial in Japan

2020 167 citations Sho Suzuki, Takuji Gotoda et al. Gut profile →

Peers

Ryoji Ichijima

SURGE

GASTR

PRM

SA

ID

Vahid Hosseini Iran

S. M. BURRIDGE United Kingdom

L Hyland Australia

Reo Sato Japan

T T Schubert United States

Antonio Francesco Ciccaglione Italy

Michael K. K. Li China

Chi-Yang Chang Taiwan

Pedro Urruzuno Spain

Vahid Hosseini Iran

Ryoji Ichijima

291 ×0.8

SURGE

125 ×0.6

GASTR

123 ×0.7

PRM

108 ×1.0

SA

14 ×0.3

ID

Citations per year, relative to Ryoji Ichijima Ryoji Ichijima (= 1×) peers Vahid Hosseini

Countries citing papers authored by Ryoji Ichijima

Since Specialization

Citations

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

Fields of papers citing papers by Ryoji Ichijima

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Ryoji Ichijima

This figure shows the co-authorship network connecting the top 25 collaborators of Ryoji Ichijima. A scholar is included among the top collaborators of Ryoji Ichijima 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 Ryoji Ichijima. Ryoji Ichijima 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:

20 of 20 papers shown

1.

Ikehara, Hisatomo, Ryoji Ichijima, Yoji Takeuchi, et al.. (2025). Efficacy and safety of remimazolam for sedation during endoscopic procedures in Japanese: A prospective phase III clinical trial. Digestive Endoscopy. 37(8). 878–887. 1 indexed citations

2.

Ichijima, Ryoji, Hisatomo Ikehara, Daisuke Yamaguchi, et al.. (2025). Comparative Study of Remimazolam and Midazolam During Sedated Upper Gastrointestinal Endoscopy: A Propensity Score Matching Analysis. JGH Open. 9(1). e70100–e70100.

3.

Ichijima, Ryoji, Hisatomo Ikehara, Daisuke Yamaguchi, et al.. (2025). Usefulness and safety of remimazolam in upper gastrointestinal endoscopy: A comparative study between elderly and non‐elderly patients. DEN Open. 5(1). e70057–e70057.

4.

Yamaguchi, Daisuke, Ryoji Ichijima, Hisatomo Ikehara, et al.. (2024). COMPARISON BETWEEN REMIMAZOLAM AND PLACEBO IN JAPANESE PATIENTS UNDERGOING COLONOSCOPY: A PHASE III, INVESTIGATOR-INITIATED, RANDOMIZED, CONTROLLED TRIAL. Gastrointestinal Endoscopy. 99(6). AB613–AB614. 1 indexed citations

5.

Yamaguchi, Daisuke, Ryoji Ichijima, Hisatomo Ikehara, et al.. (2024). COMPARISON BETWEEN REMIMAZOLAM AND PLACEBO IN JAPANESE PATIENTS UNDERGOING COLONOSCOPY: A PHASE III, INVESTIGATOR-INITIATED, RANDOMIZED, CONTROLLED TRIAL. Gastrointestinal Endoscopy. 99(6). AB523–AB524. 1 indexed citations

6.

Ichijima, Ryoji, Hisatomo Ikehara, Hiroyuki Ono, et al.. (2024). Randomized Controlled Trial of Remimazolam Compared with Placebo in Japanese Patients Undergoing Colonoscopy: A Phase III, Investigator-Initiated Trial. Digestion. 105(6). 448–456. 3 indexed citations

7.

Ichijima, Ryoji, Hisatomo Ikehara, Daisuke Yamaguchi, et al.. (2024). Randomized controlled trial of remimazolam compared with placebo in Japanese patients undergoing upper gastrointestinal endoscopy: Phase III investigator‐initiated clinical trial. Digestive Endoscopy. 36(9). 995–1002. 7 indexed citations

8.

Esaki, Mitsuru, Ryoji Ichijima, Sho Suzuki, et al.. (2022). Efficacy and timing of gastrografin administration after ileus tube insertion in patients with adhesive small bowel obstruction. Arab Journal of Gastroenterology. 23(1). 45–51. 2 indexed citations

9.

Esaki, Mitsuru, Ryoji Ichijima, Sho Suzuki, et al.. (2022). Self-completion method of endoscopic submucosal dissection using the Endosaber for treating colorectal neoplasms (with video). Scientific Reports. 12(1). 5821–5821. 2 indexed citations

10.

Suzuki, Sho, Ryoji Ichijima, Kanako Ogura, et al.. (2021). Diagnostic Ability of High-definition Imaging Using Ultraslim Endoscopes in Early Gastric Cancer. Journal of the Korean Gastric Cancer Association. 21(3). 246–246. 1 indexed citations

11.

Eto, Hiroyuki, Sho Suzuki, Chika Kusano, et al.. (2021). Impact of body size on first‐line Helicobacter pylori eradication success using vonoprazan and amoxicillin dual therapy. Helicobacter. 26(2). e12788–e12788. 31 indexed citations

12.

Suzuki, Sho, et al.. (2021). The Ideal <b><i>Helicobacter pylori</i></b> Treatment for the Present and the Future. Digestion. 103(1). 62–68. 45 indexed citations

13.

Ichijima, Ryoji, Sho Suzuki, Mitsuru Esaki, et al.. (2021). Efficacy and safety of grasping forceps-assisted endoscopic resection for gastric neoplasms: A multi-centre retrospective study. World Journal of Gastrointestinal Oncology. 13(3). 174–184. 1 indexed citations

14.

Esaki, Mitsuru, Ryoji Ichijima, Shuichi Abe, et al.. (2021). Assistant skill in gastric endoscopic submucosal dissection using a clutch cutter. World Journal of Gastrointestinal Surgery. 13(2). 116–126. 2 indexed citations

15.

Suzuki, Sho, Takuji Gotoda, Chika Kusano, et al.. (2020). Seven-day vonoprazan and low-dose amoxicillin dual therapy as first-line Helicobacter pylori treatment: a multicentre randomised trial in Japan. Gut. 69(6). 1019–1026. 167 indexed citations breakdown →

16.

Ichijima, Ryoji, Mitsuru Esaki, Yosuke Minoda, et al.. (2020). Ex vivo porcine model study on the treatment outcomes of scissor-type knife versus needle-type knife in endoscopic submucosal dissection performed by trainees. BMC Surgery. 20(1). 287–287. 3 indexed citations

17.

Gotoda, Takuji, et al.. (2020). Clinical impact of vonoprazan-based dual therapy with amoxicillin for H. pylori infection in a treatment-naïve cohort of junior high school students in Japan. Journal of Gastroenterology. 55(10). 969–976. 54 indexed citations

18.

Esaki, Mitsuru, Yosuke Minoda, Ryoji Ichijima, et al.. (2019). Self-Completion Method of Endoscopic Submucosal Dissection Using Endosaber without Any Other Device or Assistance: An ex vivo Porcine Model Study. Digestion. 102(2). 139–146. 5 indexed citations

19.

Esaki, Mitsuru, Ryoji Ichijima, & Sho Suzuki. (2019). Endoscopic submucosal dissection with Clutch Cutter using a large cap‐fitted endoscope. Digestive Endoscopy. 31(4). e88–e89. 1 indexed citations

20.

Ichijima, Ryoji, Seiichiro Abe, Ichiro Oda, et al.. (2018). A double-channel cap-assisted closure of a gastric defect after endoscopic submucosal dissection. Annals of Laparoscopic and Endoscopic Surgery. 3(4). 38–38. 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.

Explore authors with similar magnitude of impact