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31 results on '"Hasebe, Akiko"'

14. Reduced Workflow Times for Reperfusion Therapy After Acute Ischemic Stroke Using a Visual Task Management Application

Author

Matsumoto, Shoji, primary, Nakahara, Ichiro, additional, Yasuda, Ayuko, additional, Ishii, Akira, additional, Kubo, Michiya, additional, Yamada, Kentaro, additional, Okawa, Masakazu, additional, Nishi, Hidehisa, additional, Miura, Toshiyasu, additional, Koike, Daisuke, additional, Okita, Shinpei, additional, Aoki, Michiru, additional, Tanaka, Koji, additional, Suyama, Yoshio, additional, Morioka, Jun, additional, Hasebe, Akiko, additional, Tanabe, Jun, additional, Suyama, Kenichiro, additional, Watanabe, Sadayoshi, additional, Kuwahara, Kiyonori, additional, Ishihara, Takuma, additional, Koyama, Hiroshi, additional, and Kira, Jun‐ichi, additional

Published
2023
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16. Computational fluid dynamic analysis of the initiation of cerebral aneurysms

Author

Fujimura, Soichiro, primary, Tanaka, Kazutoshi, additional, Takao, Hiroyuki, additional, Okudaira, Takuma, additional, Koseki, Hirokazu, additional, Hasebe, Akiko, additional, Suzuki, Takashi, additional, Uchiyama, Yuya, additional, Ishibashi, Toshihiro, additional, Otani, Katharina, additional, Karagiozov, Kostadin, additional, Fukudome, Koji, additional, Hayakawa, Motoharu, additional, Yamamoto, Makoto, additional, and Murayama, Yuichi, additional

Published
2022
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22. Reduction of thromboembolic complications during the endovascular treatment of unruptured aneurysms by employing a tailored dual antiplatelet regimen using aspirin and prasugrel

Author

Higashiguchi, Saeko, primary, Sadato, Akiyo, additional, Nakahara, Ichiro, additional, Matsumoto, Shoji, additional, Hayakawa, Motoharu, additional, Adachi, Kazuhide, additional, Hasebe, Akiko, additional, Suyama, Yoshio, additional, Omi, Tatsuo, additional, Yamashiro, Kei, additional, Wakako, Akira, additional, Ishihara, Takuma, additional, Kawazoe, Yushi, additional, Kumai, Tadashi, additional, Tanabe, Jun, additional, Suyama, Kenichiro, additional, Watanabe, Sadayoshi, additional, Suzuki, Takeya, additional, and Hirose, Yuichi, additional

Published
2021
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23. Cortical Blood Flow Insufficiency Scores with Computed Tomography Perfusion can Predict Outcomes in Aneurysmal Subarachnoid Hemorrhage Patients: A Cohort Study

Author

Tanabe, Jun, primary, Nakahara, Ichiro, additional, Matsumoto, Shoji, additional, Suyama, Yoshio, additional, Morioka, Jun, additional, Oda, Jumpei, additional, Hasebe, Akiko, additional, Suzuki, Takeya, additional, Watanabe, Sadayoshi, additional, Suyama, Kenichiro, additional, Ohta, Tsuyoshi, additional, Murayama, Kazuhiro, additional, and Hirose, Yuichi, additional

Published
2020
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25. Experimental Analysis of Intra-luminal Pressure by Contrast Injection during Mechanical Thrombectomy: Simulation of Rupture Risk of Hidden Cerebral Aneurysm in Tandem Occlusion with Blind Alley

Author

WATANABE, Sadayoshi, primary, ODA, Jumpei, additional, NAKAHARA, Ichiro, additional, MATSUMOTO, Shoji, additional, SUYAMA, Yoshio, additional, HASEBE, Akiko, additional, SUZUKI, Takeya, additional, TANABE, Jun, additional, SUYAMA, Kenichiro, additional, and HIROSE, Yuichi, additional

Published
2020
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29. Factors influencing early obliteration during flow diverter treatment of cerebral aneurysms: Establishment of an early obliteration inhibition score.

Author

Hasebe A, Nakahara I, Matsumoto S, Morioka J, Tanabe J, Watanabe S, Suyama K, Ishihara T, and Hirose Y

Abstract

Objective: This retrospective study aimed to investigate factors associated with inhibition of early aneurysm obliteration after flow diverter (FD) treatment. We also created the early obliteration inhibition (EOI) score for pre-operative evaluation., Methods: We examined 110 cerebral aneurysms in 104 patients who underwent FD treatment. The following parameters were investigated: age, sex, symptoms, aneurysm location and type, maximum aneurysm diameter, parent vessel diameter, neck diameter, and dome-neck ratio. We also noted aneurysm location relative to the curvature of the parent artery and any branches arising from the aneurysm dome. Procedural factors such as FD diameter and length, number of FDs placed, type of FD, and use of adjunctive coiling were also investigated. Aneurysm obliteration was evaluated using digital subtraction angiography 3 months after the procedure. Adequate obliteration was defined as grade C or D on the O'Kelly-Marotta scale., Results: The following factors inhibited early obliteration: 1) extradural location, 2) saccular aneurysm, 3) aneurysm neck located at the outer convexity of the parent artery, and 4) arterial branch arising from the aneurysm dome. Odds ratios were used to create an EOI score. Receiver operating characteristic curve analysis showed that the optimal cut-off EOI score for adequate obliteration was 1.5 (area under the curve, 0.81; 95% confidence interval, 0.73-0.9; sensitivity, 0.9; specificity, 0.57)., Conclusion: The EOI score, which is based on factors that inhibit early obliteration, may predict early treatment outcomes of FD placement., Competing Interests: One of the authors (I.N.) is a technical advisor for the Terumo Corporation and has a financial relationship with the company. The other authors have no conflicts of interest to declare.

Published
2023
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30. Delays in initial workflow cause delayed initiation of mechanical thrombectomy in patients with in-hospital ischemic stroke.

Author

Suyama K, Matsumoto S, Nakahara I, Suyama Y, Morioka J, Hasebe A, Tanabe J, Watanabe S, Kuwahara K, and Hirose Y

Abstract

Objectives: The benefit of mechanical thrombectomy for acute ischemic stroke is highly time dependent. However, time to treatment is longer for in-hospital stroke patients than community-onset stroke patients. This study aimed to clarify the cause of this difference., Methods: A retrospective single-center study was performed to analyze patients with large vessel occlusion who underwent mechanical thrombectomy between January 2017 and December 2019. Patients were divided into in-hospital stroke and community-onset stroke groups. Clinical characteristics and treatment time intervals were compared between groups., Results: One hundred four patients were analyzed: 17 with in-hospital stroke and 87 with community-onset stroke. Patient characteristics did not significantly differ between groups. Median door (stroke recognition)-to-computed tomography time (36 min vs. 14 min, P<0.01) and door-to-puncture time (135 min vs. 117 min, P=0.02) were significantly longer in the in-hospital stroke group than the community-onset stroke group. However, median computed tomography-to-puncture time (104 min vs. 104 min, P=0.47) and puncture-to-reperfusion time (53 min vs. 38 min, P=0.17) did not significantly differ., Conclusions: Longer door-to-puncture time in in-hospital stroke patients was mostly caused by longer door-to-computed tomography time, which is the initial part of the workflow. An in-hospital stroke protocol that places importance on early stroke specialist consultation and prompt transportation to the computed tomography scanner might hasten treatment and improve outcomes in patients with in-hospital stroke., Competing Interests: The authors declare no conflicts of interest.

Published
2022
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31. Computational fluid dynamic analysis of the initiation of cerebral aneurysms.

Author

Fujimura S, Tanaka K, Takao H, Okudaira T, Koseki H, Hasebe A, Suzuki T, Uchiyama Y, Ishibashi T, Otani K, Karagiozov K, Fukudome K, Hayakawa M, Yamamoto M, and Murayama Y

Abstract

Objective: Relationships between aneurysm initiation and hemodynamic factors remain unclear since de novo aneurysms are rarely observed. Most previous computational fluid dynamics (CFD) studies have used artificially reproduced vessel geometries before aneurysm initiation for analysis. In this study, the authors investigated the hemodynamic factors related to aneurysm initiation by using angiographic images in patients with cerebral aneurysms taken before and after an aneurysm formation., Methods: The authors identified 10 cases of de novo aneurysms in patients who underwent follow-up examinations for existing cerebral aneurysms located at a different vessel. The authors then reconstructed the vessel geometry from the images that were taken before aneurysm initiation. In addition, 34 arterial locations without aneurysms were selected as control cases. Hemodynamic parameters acting on the arterial walls were calculated by CFD analysis., Results: In all de novo cases, the aneurysmal initiation area corresponded to the highest wall shear stress divergence (WSSD point), which indicated that there was a strong tensile force on the arterial wall at the initiation area. The other previously reported parameters did not show such correlations. Additionally, the pressure loss coefficient (PLc) was statistically significantly higher in the de novo cases (p < 0.01). The blood flow impact on the bifurcation apex, or the secondary flow accompanied by vortices, resulted in high tensile forces and high total pressure loss acting on the vessel wall., Conclusions: Aneurysm initiation may be more likely in an area where both tensile forces acting on the vessel wall and total pressure loss are large.

Published
2021
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