人类大动脉在其长度上的硬度和结构的变化
Ramin Shahbad1, Madihah Kazim1, Sayed Ahmadreza Razian1
1Department of Biomechanics, University of Nebraska Omaha, Omaha, NE, USA.
Scientific reports
|April 1, 2025
概括
人类的大动脉在其远端区域变硬和变薄,弹性质减少. 这些生物机械和结构变异对于理解大动脉功能和开发计算模型至关重要.
科学领域:
- 生物医学工程 生物医学工程
- 心血管研究研究心血管研究
- 材料科学 材料科学 材料科学
背景情况:
- 人类大动脉在机械性质上表现出区域差异,但对其结构和形态异质性的全面理解缺乏.
- 考虑了与年龄相关的变化和捐赠者人口统计 (中年和老年人).
研究的目的:
- 研究人类大动脉机械,结构和形态特征的区域差异.
- 量化特定位置的刚度,弹性质密度,壁厚和残余应力.
- 评估模拟大动脉生物力学的构成模型.
主要方法:
- 在来自10名捐赠者的新鲜人类大动脉组织上进行平面双轴测试.
- 分析了四个区域:下降胸前大动脉 (TA),上大动脉 (SC),下大动脉 (IFR) 和远部腹部大动脉 (dAA).
- 量化弹性质密度,糖氨基甘油的分布,墙壁厚度和无压力配置. 进行了构成模型.
主要成果:
- 远端大动脉区域在生理压力下显著减少拉伸,表明较低的刚性.
- 弹性质密度明显下降,从TA (23.5%) 降至dAA (8.9%),皮层变薄和碎片化.
- 墙壁厚度从TA (3.10毫米) 减少到dAA (2.77毫米);远端段具有更大的残余应力. 一个四纤维模型最好地描述了构成性行为.
结论:
- 人类大动脉在机械,结构和形态特性方面表现出显著的区域异质性.
- 距离区域的特点是降低了度,降低了弹性质含量和改变了残留应力状态.
- 这些定量见解对于推进大动脉疾病的生物力学模型和治疗策略至关重要.
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