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Effects of spontaneous breathing on the diaphragm during ventilation by rabbit models of severe lung injury

Research Project

Project/Area Number 22K16626
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Yukiko koyama  大阪大学, 大学院医学系研究科, 助教 (70942423)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2022: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords横隔膜傷害 / 重症肺傷害 / 炎症 / 肺傷害 / 横隔膜 / 人工呼吸関連横隔膜傷害 / 急性肺傷害 / 変性 / diaphragm / ARDS / 強い自発呼吸努力
Outline of Research at the Start

ウサギを用いて急性肺傷害モデルでの自発呼吸努力の違いが横隔膜に与える影響について、呼吸生理学、病理組織学的に解析を行う。今まで行ってきた肺傷害の発生メカニズムを研究する中で、自発呼吸努力を作り出す横隔膜の働きについて着想した。横隔膜が10%以上変化する場合に予後が悪くなることは臨床研究で証明されており、人工呼吸器関連横隔膜傷害とされている。しかし、横隔膜の変化を呼吸生理学と結び付け、さらに病理組織、プロテオミクス解析、遺伝子解析(RNAシーケンス)を行った研究はない。そこで今回、ウサギを用いて実験を行い、組織学的解析とRNAシーケンス解析、及び血清からのプロテオミクス解析、を行うものである。

Outline of Final Research Achievements

A model of severe lung injury was created using rabbits. Rabbits were divided into two groups, one with strong spontaneous respiration and the other without spontaneous respiration, and were placed on ventilatory management; at the end of 0, 4, and 10 hours, the diaphragm of the rabbit was removed and the extent of diaphragm injury was examined. In the group that remained strongly spontaneously breathing, injury to the diaphragm was observed over time. Pathology showed inflammatory cell infiltration, degeneration of the muscle belly, and other changes. In the group without spontaneous breathing, neither inflammatory cell infiltration nor degeneration of the muscle belly was observed. This proves that the diaphragm is inflamed and the muscle belly is degenerated when spontaneous breathing is left strongly. Furthermore, the maximum inspiratory pressure was measured over time, and it peaked at 8 hours and then dropped, suggesting that muscle fatigue had occurred.

Academic Significance and Societal Importance of the Research Achievements

重症肺傷害が起こった際に肺の治療に重点が置かれるが、横隔膜も傷害を受けており、横隔膜傷害によって人工呼吸器離脱が遅れることは以前から言われていた。筋弛緩薬を用いて横隔膜の委縮が生じることについては組織学的に証明されているが、強い自発呼吸努力を残した後に組織学的にどのようなことが起こるのかは証明されていなかった。今回の研究では横隔膜傷害を証明した結果が得られた。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report

URL: 

Published: 2022-04-19   Modified: 2025-01-30  

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