- 著者
- Susumu Fujiwara Hiroaki Nakamura Haolun Li Hisanori Miyanishi Tomoko Mizuguchi Takuo Yasunaga Takao Otsuka Yuji Hatano Shinji Saito
- 出版者
- Japan Society for Simulation Technology
- 雑誌
- 日本シミュレーション学会英文誌 (ISSN:21885303)
- 巻号頁・発行日
- vol.6, no.1, pp.94-99, 2019 (Released:2019-03-15)
- 参考文献数
- 9
- 被引用文献数
- 3 8
We propose a computational strategy for investigating structural change of tritium-substituted macromolecules. Effects of radiation on macromolecules such as polymeric materials and DNA are classified into three categories: (1) direct action, (2) indirect action, and (3) decay effect. In this study, we focus on the decay effect exclusively. After a beta decay of substituted tritium in macromolecules to helium-3, the generated inert helium-3 is assumed to be deleted quickly. To get an insight into the decay effect to the damage of macromolecules, we perform molecular dynamics simulations of tritium-deleted macromolecules and analyze their structural change. Preliminary simulation results of decay effect on polymeric materials and DNA are presented.
- 著者
- Mitsuhiko Ikebuchi Yoichi Ohta Yukihide Minoda Akiko Toki Tamotsu Nakatsuchi Hidetomi Terai Hiroaki Nakamura Ryoichi Kato Sigeyoshi Nakajima
- 出版者
- The Japanese Association of Rehabilitation Medicine
- 雑誌
- Progress in Rehabilitation Medicine (ISSN:24321354)
- 巻号頁・発行日
- vol.8, pp.20230027, 2023 (Released:2023-09-13)
- 参考文献数
- 21
Objectives: Patients with severe coronavirus disease 2019 (COVID-19) who develop pneumonia face the risk of ventilatory muscle disuse in the acute phase, which can result in persistent respiratory impairments in the subacute phase. Although rehabilitation during the acute phase is considered effective, there are limited reports on this topic. Therefore, this study aimed to investigate the effectiveness of acute-phase rehabilitation in patients with severe COVID-19.Methods: The study included 57 patients (45 men and 12 women; mean age: 63.2±12.1 years) admitted between April and June 2021, all of whom required intubation for respiratory management. Among them, 34 patients underwent acute-phase rehabilitation interventions based on the early goal-directed mobilization protocol. The primary objectives were to assess the occurrence of medical accidents related to acute-phase rehabilitation and evaluate their impact on survival and mobility upon hospital discharge. Statistical techniques and machine learning algorithms were employed for data analysis.Results: Remarkably, no medical accidents occurred during the acute-phase rehabilitation among the patients. Furthermore, our findings indicated that acute-phase rehabilitation did not influence survival outcomes. However, it did have a positive impact on the mobility of patients upon hospital discharge.Conclusions: Acute-phase rehabilitation can be safely administered to patients with severe COVID-19 by following an early goal-directed mobilization protocol. This approach may also contribute to improved activities of daily living after discharge.
- 著者
- Yuji Hatano Hiroto Shimoyachi Tatsuya Asano Takahiro Kenmotsu Takuro Wada Yasuhisa Oya Hiroaki Nakamura Susumu Fujiwara
- 出版者
- Japan Society for Simulation Technology
- 雑誌
- 日本シミュレーション学会英文誌 (ISSN:21885303)
- 巻号頁・発行日
- vol.9, no.1, pp.198-205, 2022 (Released:2022-06-17)
- 参考文献数
- 12
- 被引用文献数
- 1
The goal of this study is to establish a simple experimental system to examine the rate of double strand breaks (DSBs) of genome-sized DNA molecules under irradiation of β-rays from tritium under well-controlled conditions for the validation of computer simulation on interactions of biomolecules and ionizing radiation. Irradiation effects were insignificant at tritium concentration of 1300 Bq/cm3, indicating that the effects of β-rays were far smaller than those of oxidation and/or thermal motion at the low dose rate (4.3 μGy/h). Clear increase in DSB rate was observed at tritium concentrations of 3.0—4.0 MBq/cm3. The temperature dependence of DSB rate was examined by using the high concentration tritiated water.
- 著者
- Koji Tamai Hidetomi Terai Akinobu Suzuki Hiroaki Nakamura Masaomi Yamashita Yawara Eguchi Shiro Imagama Kei Ando Kazuyoshi Kobayashi Morio Matsumoto Ken Ishii Tomohiro Hikata Shoji Seki Masaaki Aramomi Tetsuhiro Ishikawa Atsushi Kimura Hirokazu Inoue Gen Inoue Masayuki Miyagi Wataru Saito Kei Yamada Michio Hongo Kenji Endo Hidekazu Suzuki Atsushi Nakano Kazuyuki Watanabe Junichi Ohya Hirotaka Chikuda Yasuchika Aoki Masayuki Shimizu Toshimasa Futatsugi Keijiro Mukaiyama Masaichi Hasegawa Katsuhito Kiyasu Haku Iizuka Kotaro Nishida Kenichiro Kakutani Hideaki Nakajima Hideki Murakami Satoru Demura Satoshi Kato Katsuhito Yoshioka Takashi Namikawa Kei Watanabe Kazuyoshi Nakanishi Yukihiro Nakagawa Mitsunori Yoshimoto Hiroyasu Fujiwara Norihiro Nishida Masataka Sakane Masashi Yamazaki Takashi Kaito Takeo Furuya Sumihisa Orita Seiji Ohtori
- 出版者
- The Japanese Society for Spine Surgery and Related Research
- 雑誌
- Spine Surgery and Related Research (ISSN:2432261X)
- 巻号頁・発行日
- vol.1, no.4, pp.179-184, 2017-10-20 (Released:2017-11-27)
- 参考文献数
- 26
- 被引用文献数
- 3 3
Introduction: With an aging population, the proportion of patients aged ≥80 years requiring cervical surgery is increasing. Surgeons are concerned with the high incidence of complications in this population, because "age" itself has been reported as a strong risk factor for complications. However, it is still unknown which factors represent higher risk among these elderly patients. Therefore, this study was conducted to identify the risk factors related to surgical complications specific to elderly patients by analyzing the registry data of patients aged ≥80 years who underwent cervical surgery.Methods: We retrospectively studied multicenter collected registry data using multivariate analysis. Sixty-six patients aged ≥80 years who underwent cervical surgery and were followed up for more than one year were included in this study. Preoperative patient demographic data, including comorbidities and postoperative complications, were collected from multicenter registry data. Complications were considered as major if they required invasive intervention, caused prolonged morbidity, or resulted in prolongation of hospital stay. Logistic regression analysis was performed to analyze the risk factors for complications. A p-value of <0.05 was considered as statistically significant.Results: The total number of patients with complications was 21 (31.8%), with seven major (10.6%) and 14 minor (21.2%) complications. Multivariate logistic regression analysis, after adjusting for age, revealed two significant risk factors: preoperative cerebrovascular disorders (OR, 6.337; p=0.043) for overall complications and cancer history (OR, 8.168; p=0.021) for major complications. Age, presence of diabetes mellitus, and diagnosis were not significant predictive factors for complications in this study.Conclusions: Preoperative cerebrovascular disorders and cancer history were risk factors for complications after cervical surgery in patients over 80 years old. Surgeons should pay attention to these specific risk factors before performing cervical surgery in elderly patients.