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4. A Novel Training Method for Endovascular Clot Retrieval Using a Portable Vascular Model and Red Film.

Author

Ioku, Tetsuya, Ohshima, Tomotaka, Kawaguchi, Reo, Matsuo, Naoki, and Miyachi, Shigeru

Subjects
CEREBRAL arteries, THROMBOSIS, STATIONERY, PINK
Abstract

Hands-on training is a crucial part of education in neuroendovascular treatment to ensure safe and rapid acquisition of techniques. However, there is a significant gap between training and actual clinical practice. This study will introduce innovations for more practical thrombus retrieval training that was developed in this process. A Smart Vascular Model 3 in 1 was used. A pink pseudothrombus was inserted into the M1 (horizontal segment of the middle cerebral artery) section of the model. Then, a "red underlay" purchased at a stationery store was placed to cover the proximal part of M1 and beyond so that the pseudothrombus was not visible. The thrombus was retrieved during training by looking for the location of the thrombus based on the behavior and resistance of the tip of the guidewire and deployment of the stent retriever. The participants were required to have detailed observation skills and precise manipulation skills using a red film to prevent the direct visualization of the pseudothrombus. The implementation of this innovation to the previous hands-on training made the training more practical and effective. If the exact thrombus location can be determined by the behavior of the wire tip, the device's capabilities can be maximized, and rapid retrieval can be expected. It could also reduce complications, as unnecessary peripheral guidance of the device could be avoided. [ABSTRACT FROM AUTHOR]

Published
2024
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5. How successful are we in relieving terminal dyspnea in cancer patients? A real-world multicenter prospective observational study

Author

Mori, Masanori, Morita, Tatsuya, Matsuda, Yoshinobu, Yamada, Hirohide, Kaneishi, Keisuke, Matsumoto, Yoshihisa, Matsuo, Naoki, Odagiri, Takuya, Aruga, Etsuko, Watanabe, Hiroaki, Tatara, Ryohei, Sakurai, Hiroki, Kimura, Akira, Katayama, Hideki, Suga, Akihiko, Nishi, Tomohiro, Shirado, Akemi Naito, Watanabe, Toshio, Kuchiba, Aya, Yamaguchi, Takuhiro, and Iwase, Satoru

Published
2020
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8. Relationship between Shape Retention and X-ray Absorption Value of the Tip of Microcatheters in Neuroendovascular Treatment.

Author

Ohshima, Tomotaka, Ato, Fuminori, Kawaguchi, Reo, Matsuo, Naoki, and Miyachi, Shigeru

Subjects
X-ray absorption, VASCULAR catheters, HEAT of formation
Abstract

Objective We noticed that the X-ray absorption value of the tip of each microcatheter used for aneurysm treatment varied from product to product. We hypothesized that the differences were caused by variations in the metal's density braid, which could be related to the ability of the tip to retain its shape. Methods The X-ray absorption value of each microcatheter tip was measured. Next, heat forming was performed using a shaping mandrel at 6 mm and 90 degrees to determine whether there was a correlation between the X-ray absorption value and the forming angle. Next, the optimal mandrel angle for forming each microcatheter at 90 degrees was investigated. We also examined the shape retention after 20 times wire insertions into each microcatheter. Conclusion It was found that the higher the X-ray absorption value, the harder it was for the microcatheter to be formed. The mandrel angle required to form 90 degrees was determined by the X-ray absorption value. The higher the X-ray absorption value, the higher the shape retention of the tip shape. The heat formation and shape-retention conditions of the microcatheter tip were correlated with the X-ray absorption value of the metal braid. Even for unknown microcatheters, the optimum shaping conditions can be inferred from the X-ray absorption value. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Relationship Between Extraction of Arsenic via Ion Solvation and Hansen Solubility Parameters of Extractants.

Author

Matsuo, Naoki, Ohe, Kaoru, Oshima, Tatsuya, and Yoshizuka, Kazuharu

Subjects
*SOLVATION, *SOLUBILITY, *ARSENIC removal (Water purification), *SOLVENT extraction, *ARSENIC, *ACID solutions, *ORGANIC solvents
Abstract

Extraction of As(III) from hydrochloric acid solution using various solvents on the basis of ion solvation has been reported, but a theoretical framework to describe the suitability of solvents for extraction has not been systematized. In this study, comprehensive extraction tests for As(III) using a variety of organic solvents were conducted to clarify the requirements for solvents to extract As(III). From the results of initial screening tests, various aromatics, ethers, and ketones were rated as candidates for the extraction of As(III) at high HCl concentrations, whereas aliphatic hydrocarbons were excluded. Many solvents showed high extraction capacity for As(III) to give organic fraction concentrations of 150 mM or higher. The logP value (P = partitioning coefficient between n-octanol and water) within a solvent class showed some correlation with extractability of As(III) but the correlation was invalid across solvent types. High correlation was shown between the Hansen solubility parameters of the solvents and As(III) extractability: Twenty of 22 solvents (90.9%) were appropriately classified as valid or invalid for the extraction of As(III) based on the Hansen sphere. 2-Nonanone was recommended as an ideal solvent for As(III) extraction because of its good balance between high extractability and its desirable physical properties for industrial operations. As(III) was quantitatively stripped from 2-nonanone into water with a concentration factor of 22.6. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Predictors of Responses to Corticosteroids for Cancer-Related Fatigue in Advanced Cancer Patients: A Multicenter, Prospective, Observational Study

Author

Matsuo, Naoki, Morita, Tatsuya, Matsuda, Yoshinobu, Okamoto, Kenichiro, Matsumoto, Yoshihisa, Kaneishi, Keisuke, Odagiri, Takuya, Sakurai, Hiroki, Katayama, Hideki, Mori, Ichiro, Yamada, Hirohide, Watanabe, Hiroaki, Yokoyama, Taro, Yamaguchi, Takashi, Nishi, Tomohiro, Shirado, Akemi, Hiramoto, Shuji, Watanabe, Toshio, Kohara, Hiroyuki, Shimoyama, Satofumi, Aruga, Etsuko, Baba, Mika, Sumita, Koki, and Iwase, Satoru

Published
2016
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15. Predictors of response to corticosteroids for dyspnea in advanced cancer patients: a preliminary multicenter prospective observational study

Author

Mori, Masanori, Shirado, Akemi Naito, Morita, Tatsuya, Okamoto, Kenichiro, Matsuda, Yoshinobu, Matsumoto, Yoshihisa, Yamada, Hirohide, Sakurai, Hiroki, Aruga, Etsuko, Kaneishi, Keisuke, Watanabe, Hiroaki, Yamaguchi, Takashi, Odagiri, Takuya, Hiramoto, Shuji, Kohara, Hiroyuki, Matsuo, Naoki, Katayama, Hideki, Nishi, Tomohiro, Matsui, Takashi, and Iwase, Satoru

Published
2017
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16. Predictors of responses to corticosteroids for anorexia in advanced cancer patients: a multicenter prospective observational study

Author

Matsuo, Naoki, Morita, Tatsuya, Matsuda, Yoshinobu, Okamoto, Kenichiro, Matsumoto, Yoshihisa, Kaneishi, Keisuke, Odagiri, Takuya, Sakurai, Hiroki, Katayama, Hideki, Mori, Ichiro, Yamada, Hirohide, Watanabe, Hiroaki, Yokoyama, Taro, Yamaguchi, Takashi, Nishi, Tomohiro, Shirado, Akemi, Hiramoto, Shuji, Watanabe, Toshio, Kohara, Hiroyuki, Shimoyama, Satofumi, Aruga, Etsuko, Baba, Mika, Sumita, Koki, and Iwase, Satoru

Published
2017
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20. A novel remote hands-on training for neuroendovascular-based treatment in the era of the COVID-19 pandemic.

Author

Ohshima, Tomotaka, Koiwai, Megumi, Matsuo, Naoki, and Miyachi, Shigeru

Subjects
COVID-19 pandemic, COVID-19 treatment, INTRACRANIAL aneurysms, ONLINE education, PERSONAL training, THERAPEUTIC embolization
Abstract

The COVID-19 pandemic has demanded a change in learning modalities, which led us to develop a remote personal training system for clinicians performing neuroendovascular procedures. A portable vascular model designed for practicing catheter navigation guidance, thrombus retrieval, and intracranial aneurysm coil embolisation was established. We created an environment that enabled interactive dialogue and communication across long distances using the Internet. The instructor conducted approximately 2 h of hands-on training with two to four trainees at a time. Despite the restrictions enforced by the Government of Japan due to the COVID-19 pandemic, 17 online hands-on training were successfully conducted throughout Japan over 1 year for a total of 48 trainees. The developed remote training programme, to avoid the aggregation of a large number of trainees at a developed time, proved to be at par with the conventional learning system. The training was well-received since the operation time was longer and the question and answer sessions were more fulfilling compared to the conventional format in which a group of trainees had got a brief opportunity to receive actual hands-on experience. [ABSTRACT FROM AUTHOR]

Published
2023
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22. Development of a Force Sensor for a Neuroendovascular Intervention Support Robot System.

Author

Tadauchi, Hiroki, Nagano, Yoshitaka, Miyachi, Shigeru, Kawaguchi, Reo, Ohshima, Tomotaka, and Matsuo, Naoki

Subjects
RADIATION exposure, BLOOD vessels, FLUOROSCOPY, THERAPEUTIC embolization, PROBLEM solving
Abstract

Neuroendovascular catheterization using fluoroscopy poses the problem to operators and staffs of cumulative radiation exposure. To solve this problem, we are developing a remote-controlled master-slave robot. Because a wire-like elongated treatment device is inserted into a blood vessel using a catheter, the robot requires a sensor to detect the insertion force of the wire. The proposed sensor is integrated into a robot installed in an X-ray fluoroscopy room that is remotely controlled from another room. The features of this sensor include measurement of the insertion force with sufficient accuracy, simple wire attachment, and an inexpensive disposable sensor head, rendering it very suitable for practical application. In this paper, we report on these features, as well as the results of a practical test of the sensor using a cerebrovascular model. [ABSTRACT FROM AUTHOR]

Published
2022
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25. Technical analysis of the third biennial update report of Malaysia submitted on 31 December 2020. Summary report by the team of technical experts

Author

ABDEL-AZIZ, Amr Osama, DANILA, Ana-Maria, FEYZIYEV, Toghrul, GLADE, Olia, KHALEEL, Zammath, KINYANJUI, Mwangi James, ORTEGA, Juan Luis Martin, Matsuo, Naoki, OMAMBIA, Anne Nyatichi, SOOKUN, Anand, Umemiya, Chisa, and YU, Vicente Paolo

Subjects
International Climate Regime
Abstract

This summary report presents the results of the technical analysis of the third biennial update report of Malaysia, conducted by a team of technical experts in accordance with the modalities and procedures contained in the annex to decision 20/CP.19.The author at IGES (Chisa Umemiya) served as one of the co-leads.

Published
2021

26. Technical analysis of the first biennial update report of Zambia submitted on 7 December 2020: Summary report by the team of technical experts

Author

ABDEL-AZIZ, Amr Osama, DANILA, Ana-Maria, FEYZIYEV, Toghrul, GLADE, Olia, KHALEEL, Zammath, KINYANJUI, Mwangi James, ORTEGA, Juan Luis Martin, Matsuo, Naoki, OMAMBIA, Anne Nyatichi, SOOKUN, Anand, Umemiya, Chisa, and YU, Vicente Paolo

Subjects
International Climate Regime
Abstract

This technical summary report presents the results of the technical analysis of biennial update reports of Zambia submitted in 2020, conducted by a team of technical experts in accordance with the modalities and procedures contained in the annex to decision 20/CP.19. The author at IGES (Chisa Umemiya) served as one of the co-leads.

Published
2021

27. Technical analysis of the third biennial update report of Thailand submitted on 25 December 2020. Summary report by the team of technical experts

Author

ABDEL-AZIZ, Amr Osama, DANILA, Ana-Maria, FEYZIYEV, Toghrul, GLADE, Olia, KHALEEL, Zammath, KINYANJUI, Mwangi James, ORTEGA, Juan Luis Martin, Matsuo, Naoki, OMAMBIA, Anne Nyatichi, SOOKUN, Anand, Umemiya, Chisa, and YU, Vicente Paolo

Subjects
International Climate Regime
Abstract

This summary report presents the results of the technical analysis of the third biennial update report of Thailand, conducted by a team of technical experts in accordance with the modalities and procedures contained in the annex to decision 20/CP.19.The author at IGES (Chisa Umemiya) served as one of the co-leads.

Published
2021

32. Usefulness of modified pigtail-shaped microguidewire guidance for microcatheter navigation in difficult vasculatures during neuroendovascular interventions

Author

Ohshima, Tomotaka, Shamim Ul Haq Siddiqi, Miyachi, Shigeru, Matsuo, Naoki, Kawaguchi, Reo, Kato, Yoko, and Takayasu, Masakazu

Subjects
endovascular treatment, intracranial aneurysms, shaping, microguidewire, catheterization
Abstract

We previously reported using a microguidewire with a curved, pigtail-shaped tip as an anchor for navigating a microcatheter. However, we considered that the microcatheter could follow even if the tip of wire did not advance so far distally. The present study assessed the usefulness of a modified version of this pigtail-shaped microguidewire for navigating microcatheters to difficult vasculatures during neurointerventions. The microguidewire was repeatedly evaluated using a silicon tube vascular model. We also employed this method as the first choice for some patients. In both the in vitro tests and clinical use, the round curved tip could be used to position the microguidewire at the entry of a sharply angled vessel or aneurysmal neck, and the following catheter could then be advanced gently and easily. This technique allowed navigation of the microcatheter without inserting the guidewire into the distal vasculature.

Published
2018

42. A novel ternary bismuthide, NaMgBi: crystal and electronic structure and electrical properties.

Author

Yamada, Takahiro, Matsuo, Naoki, Enoki, Masanori, and Yamane, Hisanori

Subjects
*ELECTRONIC structure, *CRYSTAL structure, *SPACE groups, *BAND gaps, *SPECIFIC gravity, *SEEBECK coefficient, *TETRAHEDRA
Abstract

A new ternary sodium magnesium bismuthide, NaMgBi, has been synthesized from the constituent metals, and its crystal structure was determined by single-crystal X-ray diffraction. NaMgBi crystallizes in a tetragonal PbFCl-type structure corresponding to the space group P4/nmm, where Z = 2, a = 4.7123(4) and c = 7.8158(7) Å. The structure is composed of layers formed by edge-sharing Bi tetrahedra centered with Mg stacked in the c-axis direction, and these layers sandwich the Na atoms. First-principles computations based on density functional theory calculations have verified that the most stable atomic configuration is the one in which the Na and Mg atoms occupy the 2a and 2c sites, respectively. The electrical resistivity measured for a sintered polycrystalline sample of NaMgBi with a relative density of 70% was found to gradually decrease from 868 to 26.4 mΩ cm upon increasing the temperature from 297 to 506 K, and the Seebeck coefficient decreased from 273 to 180 μV K−1 upon increasing the temperature from 298 to 496 K. Electronic structure calculations have revealed that NaMgBi must be a semiconductor with a small band gap of ∼0.1 eV. [ABSTRACT FROM AUTHOR]

Published
2021
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43. Strengthened Actions towards Decarbonised and Climate Resilient Society

Author

Kojima, Satoshi, Ikeda, Mariko, Matsuo, Naoki, Koide, Ryu, Tamura, Kentaro, Mitra, Bijon Kumer, Asakawa, Kenji, Suk, Sunhee, Akenji, Lewis, Amellina, Aryanie, Whitley, Shelagh, Thwaites, Joe, Wright, Helena, Ott, Caroline, and Lettenmeier, Michael

Subjects
Climate Change
Abstract

Scientific evidence suggests that cumulative GHG emissions have already caused climate change, which tolled victims all over the world but quite often charged disproportionally high costs to poor segment of the world, and substantial mitigation actions are needed to avoid irreversible catastrophic change in ecosystems that underpin very human survival. As a group of world leading countries, G20 is expected not only to pioneer ambitious actions for transition to low-carbon or decarbonized society but also to lead international cooperation in capacity development of less developed countries for implementing ambitious actions and in financing such actions.

Published
2019

45. Using (1)H(N) amide temperature coefficients to define intrinsically disordered regions: An alternative NMR method

Author

Okazaki, Hiroki, Matsuo, Naoki, Tenno, Takeshi, Goda, Natsuko, Shigemitsu, Yoshiki, Ota, Motonori, and Hiroaki, Hidekazu

Subjects
Intrinsically Disordered Proteins, Methods and Applications, Protein Conformation, Temperature, Protons, Amides, Nuclear Magnetic Resonance, Biomolecular
Abstract

This report describes a cost‐effective experimental method for determining an intrinsically disordered protein (IDP) region in a given protein sample. In this area, the most popular (and conventional) means is using the amide ((1)H(N)) NMR signal chemical shift distributed in the range of 7.5–8.5 ppm. For this study, we applied an additional step: analysis of (1)H(N) chemical shift temperature coefficients ((1)H(N)‐CSTCs) of the signals. We measured (1)H–(15)N two‐dimensional NMR spectra of model IDP samples and ordered samples at four temperatures (288, 293, 298, and 303 K). We derived the (1)H(N)‐CSTC threshold deviation, which gives the best correlation of ordered and disordered regions among the proteins examined (below −3.6 ppb/K). By combining these criteria with the newly optimized chemical shift range (7.8–8.5 ppm), the ratios of both true positive and true negative were improved by approximately 19% (62–81%) compared with the conventional “chemical shift‐only” method.

Published
2018

48. Abstracts of selected papers presented at the 78th general meeting of the Japanese Society of Gastroenterology

Author

Kusano, Motoyasu, Sekiguchi, Toshikazu, Hanyu, Nobuyoshi, Aoki, Teruaki, Matsushima, Yasuhiro, Okamoto, Eizo, Takeda, Yasuo, Takeda, Ryoyu, Miyachi, Masahiko, Nimura, Yuji, Arai, Taidoh, Masuda, Jun, Tanaka, Masao, Ogawa, Yoshiaki, Ura, Kazuhide, Matsumoto, Teiji, Taniyama, K., Kurosawa, Susumu, Owyang, Chung, Baba, Hiroshi, Fujimura, Masaki, Hamada, Eiji, Shimada, Tadahito, Kabemura, Teppei, Chijiiwa, Yoshiharu, Sato, T., Koito, K., Matsuda, Hiroko, Kawasaki, Tsunehisa, Obara, Katsutoshi, Kasukawa, Reiji, Miyoshi, Hirofumi, Matsumoto, Akio, Yamamoto, Manabu, Ohmasa, Ryouji, Kokubu, Shigehiro, Shibata, Hisao, Tajiri, Takashi, Onda, Masahiko, Hashizume, Makoto, Sugimachi, Keizo, Kobayashi, Kenji, Shiozaki, Hitoshi, Fujisaki, Junko, Shimoda, Tadakazu, Hase, Satoshi, Tsukamoto, Yoshihisa, Atsumi, M., Konishi, H., Nakajo, Shinobu, Fujiyama, Yoshihide, Taruishi, Masaki, Ayabe, Tokiyoshi, Morise, Kimitomo, Yamaguchi, Takeo, Makiyama, Kazuya, Itsuno, Minoru, Matsui, T., Okabe, N., Okabe, Nobuo, Matsui, Toshiyuki, Sakatani, Arata, Koizumi, Koichi, Imai, Yutaka, Sugino, Yoshinori, Masaki, Tadahiko, Sawada, Toshio, Nishigami, Takashi, Satomi, Masamichi, Hatada, Yasumasa, Saito, Hiroshi, Kobayshi, Kiyonori, Katsumata, Tomoe, Sugimoto, Kenji, Itabashi, Tsukasa, Kitagawa, Motoji, Hayakawa, Tetsuo, Okazaki, Kazuichi, Yamamoto, Yasuro, Funakoshi, Akihiro, Miyasaka, Kyoko, Soejima, Kazuhiko, Kanda, Mikio, Sugiyama, Masanori, Kuroda, Akira, Inoue, Hisayuki, Bamba, Tadao, Hamanaka, Y., Suzuki, T., Suzuki, Mamoru, Hanyu, Fujio, Tamura, Katsuhiro, Nakase, Akira, Noguchi, M., Hiwatashi, N., Murata, Yuhji, Suzuki, Kazuo, Ohtani, Haruo, Watanabe, Yoshihisa, Zeniya, Mikio, Aizawa, Yoshio, Masumoto, T., Onji, M., Hamasaki, Keisuke, Nakata, Keisuke, Fukui, Hiroshi, Tsujii, Tadasu, Yamashiki, Masayoshi, Nishimura, Akira, Tsutsui, Hiroko, Mizoguchi, Yasuhiro, Kimura, Fumio, Miyazaki, Masaru, Kiyota, Keisuke, Inokuchi, Hideto, Yamamoto, Yoshihiro, Oka, Hiroshi, Horikoshi, Tsutomu, Sekiguchi, Toshikazu, Takayasu, H., Shirai, T., Hongo, Michio, Okuno, Yo, Okano, H., Aoyama, N., Ohsuki, Masao, Maeda, Kenji, Haruma, Ken, Sumii, Koji, Nakai, Yoshihide, Fukunaga, Mikihiko, Kaneko, Hiroshi, Morise, Kimitomo, Okumura, Toshikatsu, Uehara, Akira, Fukuda, Yoshihiro, Satomi, Masamichi, Joh, Takashi, Itoh, Makoto, Kitagawa, Yuko, Kitajima, Masaki, Iwao, Tadashi, Toyonaga, Atsushi, Nakamura, Masahiko, Oda, Masaya, Kawamura, Yukimitsu, Dohden, Kenji, Kamiyama, Yasuhiko, Matsuno, Seiki, Hirano, Morihisa, Otsuka, Sachio, Ito, Masahiro, Sekine, Ichiro, Ogihara, Tatsuo, Sato, Nobuhiro, Uehara, Akira, Namiki, Masayoshi, Sugiura, Nobuyuki, Ebara, Masaaki, Matsuo, Naoki, Uchida, Hideo, Okada, Shuichi, Okazaki, Nobuo, Tsujii, Hirohiko, Ohsuga, Toshiaki, Abe, M., Nagata, Y., Yamasaki, Susumu, Kosuge, Tomoo, Kitamoto, Mikiya, Nakanishi, Toshio, Ichikawa, Yuzo, Mizoguchi, Yasuhiro, Ohtake, Yoshio, Hirasawa, Hiroyuki, Sugihara, Junichi, Muto, Yasutoshi, Yasunaga, Mitsuru, Okita, Kiwamu, Ukida, Minoru, Tsuji, Takao, Isai, Hideya, Uchino, Junichi, Suzuki, Katsuhiko, Komatsu, Kanji, Ohtomo, Yumiko, Idezuki, Yasuo, Sakuramachi, Shunji, Kimura, Taizo, Kitano, Seigo, Sugimachi, Keizo, Moriyama, Masaaki, Yazaki, Yasuyuki, and Saito, Takashige

Published
1993
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