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Elucidation of the hemodynamics of the vena cava system during inferior vena cava and aorta occlusion

Research Project

Project/Area Number 20K17904
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 55060:Emergency medicine-related
Research InstitutionJichi Medical University

Principal Investigator

Izawa Yoshimitsu  自治医科大学, 医学部, 准教授 (90565699)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2022: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords肝背側下大静脈損傷 / IVC損傷 / 静脈還流 / 大動脈遮断バルーン / REBOA / Phase contrast MRI / IVC遮断 / 下大静脈損傷 / 大静脈循環 / 大静脈系血行動態の変化 / 大動脈遮断 / 下大静脈遮断 / 出血性ショック / Phase Contrast MRI
Outline of Research at the Start

肝背側下大静脈損傷の救命率は非常に低く、これまでの止血方法はいずれも救命率の改善がみられません。このため、大動脈遮断バルーンなどの最近の止血方法を用いた時の大静脈系の血流動態変化を調べることで、有効な止血方法の開発に繋がらないかを調べます。方法としては、全身麻酔下のブタを用いて、MRIによる画像診断を駆使して止血介入時の大静脈系の血行動態変化を解析します。

Outline of Final Research Achievements

Retrohepatic vena cava injury is highly lethal and requires prompt procedures for temporary hemostasis. We used a porcine shock model under general anesthesia to investigate the great venous hemodynamic changes during Resuscitative endovascular aortic balloon occlusion (REBOA) and inferior vena cava (IVC) occlusion. A REBOA was placed in zone one, and Rummel tourniquets were set up at the level of the proximal and distal sides of the liver in the IVC. After drawing 20% of the total blood volume, we measured the superior vena cava and IVC blood flow by phase contrast MRI and vital signs. Vital signs improved with REBOA alone, but venous return did not improve. Vital signs did not improve and the amount of venous return decreased significantly with REBOA and IVC occlusion combined. REBOA can avoid temporary cardiac arrest, but it does not improve venous return. Treatment interventions that do not reduce venous return will be required in conjunction with REBOA.

Academic Significance and Societal Importance of the Research Achievements

これまで出血性ショックに対して行われるREBOAとIVC遮断を同時に行った場合の大静脈の血行動態変化を観察した研究は殆ど見当たらない。本研究の成果は、大静脈系の止血と循環動態の維持を両立する優れた止血方法を切り開くうえで、その基礎をなす外科的介入時の大静脈循環の変化を解明することに学術的な意味がある。
また、肝背側下大静脈損傷による出血に対して下大静脈クランプやREBOA等の外科的止血介入が行われる際に、大静脈系の血行動態や心拍出量の変化を解明することで、肝背側下大静脈損傷に対する有効な止血方法が開発され患者救命に貢献する可能性がある。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (1 results)

All 2023

All Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] Changes of blood flow in the venous system during REBOA and IVC clamping measured by phase contrast MRI in a porcine shock model2023

    • Author(s)
      Yoshimitsu Izawa
    • Organizer
      10th World Society of Emergency Surgery Congress
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

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