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Identifying risk factors for the post replacement-related complications following aortic valve replacement in patients with severe aortic valve stenosis with 4D-MRI blood flow dynamics imaging.

Research Project

Project/Area Number 19K17510
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53020:Cardiology-related
Research InstitutionHokkaido University

Principal Investigator

Kamiya Kiwamu  北海道大学, 大学病院, 助教 (60797108)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords大動脈弁狭窄症 / 大動脈弁置換術 / 心不全 / 経カテーテル的大動脈弁留置術 / 磁気共鳴画像
Outline of Research at the Start

本研究は,症候性AS患者でTAVIによる治療を受ける患者を対象に,1)心不全再入院もしくは死亡をアウトカムにして4D-Flowにより得られる血流動態指標(血流速度,渦血流,らせん血流,血流の偏心性,壁ずり応力,エネルギー損失 )との関連を検討する,2)4D-CTを用いて確認される弁血栓の発生をアウトカムにして,4D-Flowにより得られる血流動態指標との関連を検討する。4D-Flowの血流解析により,TAVI弁における人工弁関連合併症予測指標を明らかにする。

Outline of Final Research Achievements

Periprocedural hemodynamic changes, which could adversely affect outcomes after transcatheter aortic valve replacement (TAVR), have not been well investigated. Four-dimensional (4D) flow magnetic resonance imaging (MRI) enables accurate measurement of blood flow dynamics such as flow velocity, flow pattern, wall shear stress (WSS), and energy loss (EL). This study is an initial report evaluating periprocedural blood flow dynamics using 4D flow MRI before and after TAVR. Our analyses revealed that helical flow, WSS and EL in the ascending aorta were significantly decreased and EL was negatively correlated with effective orifice area index after TAVR. Our findings suggest that TAVR improves blood flow dynamics especially when a larger effective orifice area index is obtained.

Academic Significance and Societal Importance of the Research Achievements

経カテーテル的大動脈弁留置術(TAVI)は、重症大動脈弁狭窄(AS)患者に対する低侵襲治療として普及してきている。しかし、TAVI後も心不全の増悪を繰り返す症例が少なからず存在する。四次元(four-dimensional; 4D)血流MRI(4D flow MRI)は、心血管系血流動態の正確な可視化と定量化を可能にする新しい血流イメージング技術である。我々は4D flow MRIを用いてTAVIによる血行動態の変化を詳細に評価した。今回の研究成果により、TAVI治療の更なる成績向上につながる礎となることが期待される。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (7 results)

All 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] 4-Dimensional Flow Cardiovascular Magnetic Resonance Imaging of Changes in Blood Flow Dynamics After Surgery for Discrete Subaortic Stenosis2021

    • Author(s)
      Komoriyama Hirokazu、Kamiya Kiwamu、Kobayashi Yuta、Tsuneta Satonori、Konishi Takao、Sato Takuma、Iwano Hiroyuki、Nagai Toshiyuki、Wakasa Satoru、Kudo Kohsuke、Anzai Toshihisa
    • Journal Title

      Circulation Journal

      Volume: 85 Issue: 6 Pages: 954

    • DOI

      10.1253/circj.CJ-20-1248

    • NAID

      130008043140

    • ISSN
      1346-9843, 1347-4820
    • Year and Date
      2021-05-25
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Four-dimensional flow magnetic resonance imaging visualizes significant changes in flow pattern and wall shear stress in the ascending aorta after transcatheter aortic valve implantation in a patient with severe aortic stenosis2020

    • Author(s)
      Komoriyama Hirokazu、Tsuneta Satonori、Oyama-Manabe Noriko、Kamiya Kiwamu、Nagai Toshiyuki
    • Journal Title

      European Heart Journal - Cardiovascular Imaging

      Volume: 21 Pages: 21-21

    • DOI

      10.1093/ehjci/jez192

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] VISUALIZATION OF PERIPROCEDUAL BLOOD FLOW DYNAMICS WITH FOUR-DIMENSIONAL FLOW MAGNETIC RESONANCE IMAGING IN PATIENTS WITH SEVERE AORTIC STENOSIS UNDERGOING TRANSCATHETER AORTIC VALVE REPLACEMENT2020

    • Author(s)
      Komoriyama Hirokazu、Kamiya Kiwamu、Nagai Toshiyuki、Oyama-Manabe Noriko、Tsuneta Satonori、Kobayashi Yuta、Kato Yoshiya、Omote Kazunori、Konishi Takao、Sato Takuma、Tsujinaga Shingo、Iwano Hiroyuki、Shingu Yasushige、Wakasa Satoru、Anzai Toshihisa
    • Journal Title

      Journal of the American College of Cardiology

      Volume: 75 Issue: 11 Pages: 1639-1639

    • DOI

      10.1016/s0735-1097(20)32266-x

    • Related Report
      2019 Research-status Report
  • [Presentation] 三次元シネ位相コントラスト磁気共鳴画像による経カテーテル的大動脈弁置換術前後における血流動態の検討2021

    • Author(s)
      小森山 弘和, 神谷 究, 永井 利幸, 常田 慧徳, 佐藤 友哉, 竹中 秀, 水口 賢史, 多田 篤司, 小林 雄太, 佐藤 琢真, 小西 崇夫, 岩野 弘幸, 新宮 康栄, 若狭 哲, 安斉 俊久
    • Organizer
      第51回 日本心血管インターベンション治療学会 北海道地方会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 三次元シネ位相コントラスト磁気共鳴画像による経カテーテル的大動脈弁置換術前後における血流動態の検討2021

    • Author(s)
      小森山 弘和, 神谷 究, 永井 利幸, 常田 慧徳, 佐藤 友哉, 竹中 秀, 水口 賢史, 多田 篤司, 小林 雄太, 佐藤 琢真, 小西 崇夫, 岩野 弘幸, 新宮 康栄, 若狭 哲, 安斉 俊久
    • Organizer
      第29回日本心血管インターベンション治療学会; CVIT 2020 学術集会
    • Related Report
      2020 Annual Research Report
  • [Presentation] VISUALIZATION OF PERIPROCEDUAL BLOOD FLOW DYNAMICS WITH FOUR‐DIMENSIONAL FLOW MAGNETIC RESONANCE IMAGING IN PATIENTS WITH SEVERE AORTIC STENOSIS UNDERGOING TRANSCATHETER AORTIC VALVE REPLACEMENT2020

    • Author(s)
      Hirokazu Komoriyama, Kiwamu Kamiya, Toshiyuki Nagai, Noriko Oyama-Manabe, Satonori Tsuneta, Yuta Kobayashi, Yoshiya Kato, Kazunori Omote, Takao Konishi, Takuma Sato, Shingo Tsujinaga, Hiroyuki Iwano, Yasushige Shingu, Satoru Wakasa, Toshihisa Anzai
    • Organizer
      The 69th American College of Cardiology Annual Scientific Session. MAR. 2020. Chicago, USA.
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] VISUALIZATION OF PERIPROCEDUAL BLOOD FLOW DYNAMICS WITH FOUR-DIMENSIONAL FLOW MAGNETIC RESONANCE IMAGING IN PATIENTS WITH SEVERE AORTIC STENOSIS UNDERGOING TRANSCATHETER AORTIC VALVE REPLACEMENT2020

    • Author(s)
      Hirokazu Komoriyama, Kiwamu Kamiya
    • Organizer
      American College of Cardiology(ACC)2020:69th Annual Scientific Session & Expo
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2022-01-27  

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