大动脉剖析中的血液动力学:在一个理想化的剖析模型中进行液体-固体相互作用研究,该模型具有虚假的光线侧分支
Amith Balasubramanya1, Lise Gheysen1, Markus U Wagenhäuser2
1Institute of Biomedical Engineering and Technology, Department of Electronics and Information Systems, Ghent University, Belgium.
Journal of biomechanics
|May 31, 2025
概括
在B型大动脉剖析 (TBAD) 中,侧枝 (SB) 会增加真 (TL) 和假 (FL) 中的压力. 在FL中的SBs降低FL喷射率和剖析膜运动,影响TBAD血动力学.
科学领域:
- 心血管力学心血管力学
- 生物医学工程 生物医学工程
- 医学成像和模拟技术
背景情况:
- 在B型大动脉剖析 (TBAD) 中,来自虚假光线 (FL) 的侧枝 (SB) 影响FL的通透性和生长.
- 了解FL血液动力学对于TBAD管理至关重要.
- 液体 - 固体相互作用 (FSI) 模拟为复杂的大动脉剖析机制提供了洞察力.
研究的目的:
- 使用FSI模拟在TBAD中不同SB配置下的FL血动力学进行比较.
- 量化SB存在和位置对TL和FL压力,流量和膜位移的影响.
- 阐明SBs在TBAD病理生理学中的作用.
主要方法:
- 采用了强合的流体-固体相互作用 (FSI) 模拟.
- 模拟了四种场景:没有SB (NSB),SB在FL (SB_FL),SB在FL没有重新进入撕裂 (SB_FL_1T),和SB在TL (SB_TL).
- 脉冲式质量流入口和输出口的Windkessel模型确保了一致的总血管阻力.
主要成果:
- 在TL和FL中,SB的存在增加了缩压,在SB_FL中观察到的最大增加.
- 在FL中的SBs降低了FL喷射率 (FLEF) 和增加了循环平均跨膜压力 (TMP ̄).
- NSB显示了最大的切割膜位移,而SB_FL显示了最小的.
结论:
- 在流速变化之外,SBs显著改变了TBAD的血液动力学,增加了TL和FL的压力.
- SBs,特别是FL中的SBs,影响FL功能和大动脉壁运动.
- 虽然这些发现是基于理想化的几何学,但他们强调了SBs在TBAD中的血液动力学重要性.
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