著者

安藤 孝弘 田中 義照 佐久間 正明 遠藤 久芳 Takahiro ANDO Yoshiteru TANAKA Masaaki SAKUMA Hisayoshi ENDO 国土交通省船舶技術研究所構造強度部 国土交通省船舶技術研究所機関動力部 国土交通省船舶技術研究所構造強度部 国土交通省船舶技術研究所構造強度部

雑誌

船舶技術研究所総合報告資料

巻号頁・発行日

vol.平成12年度, pp.85-112, 2001-03-31 (Released:2017-04-14)

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Recently, the extensive use of high-tensile steel for ship hull structures has realized the decrease of plate thickness, under the design condition that no members yield for the design loads. However, the post buckling design as well as air planes is required to aim at the further making the most of high-tensile strength. This study had been performed as a designated study of Ship Research Institute for three years, in order to investigate the applicability of the post buckling design for ship structures assembled by welding. The details are as follows: ・Investigation of buckling analysis methods of panel or stiffened panel ・Model tests and numerical analysis of stiffened panel ・fatigue tests of stiffened panel subjected to pulsating compressive and shear load ・Investigation of the applicability of the post buckling design for ship structures

著者

Takahiro ANDO Takatomo WATANABE Saori MATSUO Tomoki SAMEJIMA Junya YAMAGISHI Takanobu BITO Genki NARUSE Akihiro YOSHIDA Shingo MINATOGUCHI Haruhiko AKIYAMA Kazuhiko NISHIGAKI Shinya MINATOGUCHI Hiroyuki OKURA

出版者

Japanese Society of Physical Therapy

雑誌

Physical Therapy Research (ISSN:21898448)

巻号頁・発行日

vol.25, no.1, pp.18-25, 2022-04-20 (Released:2022-04-20)

参考文献数

26

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Objective: To examine the Cardiac Rehabilitation Gifu Network (CR-GNet) feasibility in managing diseases and assisting patients in attaining physical fitness, and its impact on long-term outcomes after acute coronary syndrome (ACS). Methods: In this prospective observational study, we enrolled 47 patients with ACS registered in the CR-GNet between February 2016 and September 2019. 37, 29, and 21 patients underwent follow-up assessments for exercise capacity (peak oxygen uptake) at 3 months, 6 months, and 1 year after discharge, respectively. Major adverse cardiac events (MACE) were compared with controls not registered in the CR-GNet. Results: The coronary risk factors, except blood pressure, improved at 3 and 6 months, and 1 year after discharge. These risk factors in each patient significantly reduced from 2.9 at admission to 1.6, 1.4, and 1.9 at 3 months, 6 months, and 1 year after discharge (p<0.05), respectively. Peak oxygen uptake was significantly higher at 3 months (17.5±4.9 ml/kg/min), 6 months (17.9±5.1 ml/kg/min), and 1 year (17.5±5.5 ml/kg/min) after discharge than that at discharge (14.7±3.6 ml/kg/min) (p<0.05). During follow-up, there was no significant difference; MACE did not occur in any patients in the CR-GNet but occurred in controls. Conclusion: CR-GNet is a feasible option for the long-term management of ACS patients.

著者

Tetsuro Sekine Masatoki Nakaza Mitsuo Matsumoto Takahiro Ando Tatsuya Inoue Shun-Ichiro Sakamoto Mitsunori Maruyama Makoto Obara Olgierd Leonowicz Jitsuo Usuda Shinichiro Kumita

出版者

Japanese Society for Magnetic Resonance in Medicine

雑誌

Magnetic Resonance in Medical Sciences (ISSN:13473182)

巻号頁・発行日

pp.rev.2021-0137, (Released:2022-02-19)

参考文献数

68

被引用文献数

3

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Most cardiac diseases cause a non-physiological blood flow pattern known as turbulence around the heart and great vessels, which further worsen the disease itself. However, there is no consensus on how blood flow can be defined in disease conditions. Especially, in the left atrium, the fact that vortex flow already exists makes this debate more complicated. 3D time-resolved phase-contrast (4D flow) MRI is expected to be able to capture blood flow patterns from multiple aspects, such as blood flow velocity, stasis, and vortex quantification. Previous studies have confirmed that physiological vortex flow is predominantly induced by the higher-volume flow from the superior left pulmonary vein. In atrial fibrillation, 4D flow MRI reveals a non-physiological blood flow pattern, which information may add value to well-established clinical risk factors. Currently, the research target of LA analysis has also widened to lung surgeons, pulmonary vein stump thrombosis after left upper lobectomy. 4D flow MRI is expected to be utilized for many more variable diseases that are currently unimaginable.

著者

Masatoki Nakaza Mitsuo Matsumoto Tetsuro Sekine Tatsuya Inoue Takahiro Ando Masashi Ogawa Makoto Obara Olgierd Leonowicz Shinichiro Kumita Jitsuo Usuda

出版者

Japanese Society for Magnetic Resonance in Medicine

雑誌

Magnetic Resonance in Medical Sciences (ISSN:13473182)

巻号頁・発行日

pp.mp.2020-0170, (Released:2021-03-31)

参考文献数

40

被引用文献数

19

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Purpose: The purpose of the current study was to clarify the blood flow pattern in the left atrium (LA), potentially causing the formation of thrombosis after left upper lobectomy (LUL). The blood flow in the LA was evaluated and compared between LUL patients with and without thrombosis. For the evaluation, we applied highly accelerated 4D flow MRI with dual-velocity encoding (VENC) scheme, which was expected to be able to capture slow flow components in the LA accurately.Methods: Eight volunteers and 18 patients subjected to LUL underwent dual-VENC 4D Flow MRI. Eight patients had a history of thrombosis. We measured the blood flow velocity and stasis ratio (proportion in the volume that did not exceed 10 cm/s in any cardiac phase) in the LA and left superior pulmonary vein (LSPV) stump. For visual assessment, the presence of each collision of the blood flow from pulmonary veins and vortex flow in the LA were evaluated. Each acquired value was compared between healthy participants and LUL patients, and in LUL patients with and without thrombosis.Results: In LUL patients, blood flow velocity near the inflow part of the left superior pulmonary vein (Lt Upp) and mean velocity in the LA were lower, and stasis ratio in the LA was higher compared with healthy volunteers (Lt Upp 9.10 ± 3.09 vs.13.23 ± 14.19 cm/s, mean velocity in the LA 9.81 ± 2.49 vs. 11.40 ± 1.15 cm/s, and stasis ratio 25.28 ± 18.64 vs. 4.71 ± 3.03%, P = 0.008, 0.037, and < 0.001). There was no significant difference in any quantification values between LUL patients with and without thrombosis. For visual assessment, the thrombus formation was associated with no collision pattern (62.5% vs. 10%, P = 0.019) and not with vortex flow pattern (50% vs. 30%, P = 0.751).Conclusion: The net blood flow velocity was not associated with the thrombus formation. In contrast, a specific blood flow pattern, the absence of blood flow collision from pulmonary veins, correlates to the thrombus formation in the LA.

著者

Shingo Minatoguchi Takahiro Ando Toshiki Tanaka Yoshihisa Yamada Hiromitsu Kanamori Masanori Kawasaki Kazuhiko Nishigaki Shinya Minatoguchi

出版者

The Japanese Circulation Society

雑誌

Circulation Reports (ISSN:24340790)

巻号頁・発行日

vol.1, no.1, pp.17-19, 2019-01-10 (Released:2019-01-10)

参考文献数

9

被引用文献数

3

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Background: It is still unclear whether dynamic exercise increases the number of Muse cells, pluripotent stem cells, in the peripheral blood. Methods and Results: The number of Muse cells, SSEA3+ and CD105+ double-positive cells, in the peripheral blood was measured using FACS before and after 40 min of cardiac rehabilitation with dynamic exercise in 6 patients with heart disease. The number of Muse cells significantly increased after cardiac rehabilitation in all patients. Muse cell mobilization may be related to the beneficial clinical outcome of cardiac rehabilitation. Conclusions: Cardiac rehabilitation increases the number of Muse cells in the peripheral blood.