Nao Ichihara

2.3k total citations
52 papers, 422 citations indexed

About

Nao Ichihara is a scholar working on Surgery, Cardiology and Cardiovascular Medicine and Epidemiology. According to data from OpenAlex, Nao Ichihara has authored 52 papers receiving a total of 422 indexed citations (citations by other indexed papers that have themselves been cited), including 16 papers in Surgery, 13 papers in Cardiology and Cardiovascular Medicine and 11 papers in Epidemiology. Recurrent topics in Nao Ichihara's work include Cardiac, Anesthesia and Surgical Outcomes (7 papers), Frailty in Older Adults (5 papers) and Health Systems, Economic Evaluations, Quality of Life (5 papers). Nao Ichihara is often cited by papers focused on Cardiac, Anesthesia and Surgical Outcomes (7 papers), Frailty in Older Adults (5 papers) and Health Systems, Economic Evaluations, Quality of Life (5 papers). Nao Ichihara collaborates with scholars based in Japan, United States and Thailand. Nao Ichihara's co-authors include Hiroaki Miyata, Yuko Kitagawa, Hideki Endo, Satoshi Umemura, Hiroyuki Yamamoto, Shun Kohsaka, Hiraku Kumamaru, Tomoaki Ishigami, Yoshiki Miyachi and Fusao Ikawa and has published in prestigious journals such as Journal of Clinical Oncology, PLoS ONE and Hypertension.

In The Last Decade

Nao Ichihara

44 papers receiving 413 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Nao Ichihara Japan	12	134	123	93	87	57	52	422
Nageshwara Gullapalli United States	11	87 0.6×	180 1.5×	90 1.0×	58 0.7×	128 2.2×	47	436
Yibo He China	14	97 0.7×	245 2.0×	77 0.8×	115 1.3×	34 0.6×	67	631
Wing Chan United States	14	80 0.6×	303 2.5×	70 0.8×	54 0.6×	41 0.7×	25	620
Atsutoshi Takagi Japan	15	58 0.4×	220 1.8×	62 0.7×	59 0.7×	38 0.7×	25	443
Omair A. Shariq United States	14	263 2.0×	116 0.9×	42 0.5×	60 0.7×	79 1.4×	36	545
Jun Shitara Japan	16	206 1.5×	351 2.9×	76 0.8×	125 1.4×	98 1.7×	68	710
Marek Maciejewski Poland	12	90 0.7×	249 2.0×	48 0.5×	109 1.3×	31 0.5×	56	421
Jacek Niedziela Poland	13	143 1.1×	378 3.1×	95 1.0×	97 1.1×	121 2.1×	62	685
Xiaoqiang Ding China	17	137 1.0×	76 0.6×	70 0.8×	83 1.0×	53 0.9×	39	738
Cheng-Hsueh Wu Taiwan	11	158 1.2×	146 1.2×	53 0.6×	59 0.7×	40 0.7×	22	454

Countries citing papers authored by Nao Ichihara

Since Specialization

Citations

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

Fields of papers citing papers by Nao Ichihara

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Nao Ichihara

This figure shows the co-authorship network connecting the top 25 collaborators of Nao Ichihara. A scholar is included among the top collaborators of Nao Ichihara 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 Nao Ichihara. Nao Ichihara 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

Fukuda, Hitoshi, Kei Kawada, Takatoshi Sorimachi, et al.. (2025). Risk factors of short-term poor functional outcomes and long-term durability of ruptured large or giant intracranial aneurysms. Journal of neurosurgery. 142(6). 1776–1785. 2 indexed citations

Nishikitani, Mariko, et al.. (2025). Career advancement and fertility intention among working women in Japan: a cross-sectional survey study. BMC Women s Health. 25(1). 424–424.

Kunihara, Takashi, et al.. (2025). Impact of the frozen elephant trunk technique in operation for acute type A aortic dissection: from the Japan cardiovascular surgery database. General Thoracic and Cardiovascular Surgery. 74(2). 141–150.

Sato, Hiroyuki, Yukari Uemura, Ayako Mikami, et al.. (2024). How Much More Efficient Are Adaptive Platform Trials Than Multiple Stand‐Alone Trials? A Comprehensive Simulation Study for Streamlining Drug Development During a Pandemic. Clinical Pharmacology & Therapeutics. 115(6). 1372–1382.

Ichihara, Nao, et al.. (2023). Global landscape of randomized controlled trials responding to the COVID-19 pandemic: a literature review protocol. F1000Research. 12. 133–133. 1 indexed citations

Kaibori, Masaki, Nao Ichihara, Hiroaki Miyata, et al.. (2022). Surgical outcomes of laparoscopic versus open repeat liver resection for liver cancers: A report from a nationwide surgical database in Japan. Journal of Hepato-Biliary-Pancreatic Sciences. 29(8). 833–842. 5 indexed citations

Maeda, Hiromichi, Hideki Endo, Nao Ichihara, et al.. (2022). Correlation between surgical mortality for perforated peritonitis and days of the week for operations: A retrospective study using the Japanese National Clinical Database. The American Journal of Surgery. 224(1). 546–551. 3 indexed citations

Oya, Soichi, Fusao Ikawa, Nao Ichihara, et al.. (2022). Male sex and presence of preoperative symptoms are associated with early recurrence of WHO grade I meningiomas after surgical resection: analysis from the nationwide Brain Tumor Registry of Japan. Neurosurgical Review. 46(1). 10–10. 1 indexed citations

Maeda, Hiromichi, Hideki Endo, Nao Ichihara, et al.. (2021). Association of day of the week with mortality after elective right hemicolectomy for colon cancer: Case analysis from the National Clinical Database. Annals of Gastroenterological Surgery. 5(3). 331–337. 5 indexed citations

10.

Oya, Soichi, Fusao Ikawa, Nao Ichihara, et al.. (2021). Effect of adjuvant radiotherapy after subtotal resection for WHO grade I meningioma: a propensity score matching analysis of the Brain Tumor Registry of Japan. Journal of Neuro-Oncology. 153(2). 351–360. 15 indexed citations

11.

Takeuchi, Masashi, Masahiro Hashimoto, Nao Ichihara, et al.. (2021). Performance of a deep learning-based identification system for esophageal cancer from CT images. Esophagus. 18(3). 612–620. 38 indexed citations

12.

Yamamoto, Hiroyuki, Eiji Nakatani, Hiraku Kumamaru, et al.. (2020). Real-World Evidence of the Incidence of and Risk Factors for Type 1 Diabetes Mellitus and Hypothyroidism as Immune-Related Adverse Events Associated With Programmed Cell Death-1 Inhibitors. Endocrine Practice. 27(6). 586–593. 13 indexed citations

13.

Kohsaka, Shun, Hiraku Kumamaru, Satoshi Shoji, et al.. (2020). Incidence of adverse cardiovascular events in type 2 diabetes mellitus patients after initiation of glucose‐lowering agents: A population‐based community study from the Shizuoka Kokuho database. Journal of Diabetes Investigation. 12(8). 1452–1461. 14 indexed citations

14.

Endo, Hideki, Nao Ichihara, Arata Takahashi, et al.. (2020). Association between prehospital transfer distance and surgical mortality in emergency thoracic aortic surgery. Journal of Thoracic and Cardiovascular Surgery. 163(1). 28–35.e1. 10 indexed citations

15.

Kunihara, Takashi, Nao Ichihara, Hiroaki Miyata, et al.. (2019). Valve-sparing root replacement and composite valve graft replacement in patients with aortic regurgitation: From the Japan Cardiovascular Surgery Database. Journal of Thoracic and Cardiovascular Surgery. 158(6). 1501–1511.e6. 9 indexed citations

16.

Irie, Hiromasa, Hiroaki Okamoto, Shigehiko Uchino, et al.. (2019). The Japanese Intensive care PAtient Database (JIPAD): A national intensive care unit registry in Japan. Journal of Critical Care. 55. 86–94. 52 indexed citations

17.

Inohara, Taku, Nao Ichihara, Shun Kohsaka, et al.. (2018). The effect of body weight in infants undergoing ventricular septal defect closure: A report from the Nationwide Japanese Congenital Surgical Database. Journal of Thoracic and Cardiovascular Surgery. 157(3). 1132–1141.e7. 6 indexed citations

18.

Ergai, Awatef, Nao Ichihara, Ann D. Smith, et al.. (2015). User-Centered Design of the Clinical Dashboard for the MySafeCare Patient Safety Reporting System.. AMIA. 2 indexed citations

19.

Fujiwara, Akira, Nobuhito Hirawa, Megumi Fujita, et al.. (2014). Impaired nitric oxide production and increased blood pressure in systemic heterozygous ATP2B1 null mice. Journal of Hypertension. 32(7). 1415–1423. 21 indexed citations

20.

Miyazaki, Seiji, Hiroshi Taniguchi, Shigeki Kusa, et al.. (2014). Catheter ablation of atrial tachyarrhythmias causing inappropriate implantable cardioverter-defibrillator shocks. EP Europace. 17(2). 289–294. 5 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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