Radial and axial motion of the initially-tensioned orthotropic arterial wall in arterial pulse wave propagation
Radial and axial motion of the initially-tensioned orthotropic arterial wall in arterial pulse wave propagation
复制标题
动脉脉搏波传播中初始张紧正交各向异性动脉壁的径向和轴向运动
DOI：
10.1115/1.4053863
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
and Hao, Zhili.
中科院分区：
文献类型：
--
作者：
Smith, Sara M.;Marin, Justine;Adams, Amari;West, Keith;and Hao, Zhili.
将动脉壁模拟为初始张紧的薄壁正交各向异性管，本研究旨在分析动脉壁的径向和轴向运动，从而揭示动脉壁的轴向运动和两种初始张力在动脉脉搏波传播中的作用。将相关的临床研究结果与文献中的脉搏波理论相结合，对具有径向和轴向壁运动的动脉脉搏波传播进行了理论研究。由于Young波是由脉动压力激发的，并在临床研究中进行了检查，因此通常测量的Young波中的脉动参数以脉动压力表示，其值是用升主动脉和颈动脉处的周向弹性（Eθ）和初始张力（Tθ0）的公认值以及轴向弹性（Ex）和初始张力（Tx 0）的假设值计算的。排除轴向室壁运动的相应值也进行了计算。通过对包含和排除轴向室壁运动的计算结果进行比较，发现：（1）轴向室壁运动不影响径向室壁运动和其他常用测量的脉动参数，但壁面剪应力除外;（2）轴向室壁运动是由壁面剪应力和径向室壁位移梯度引起的，其因子为（Tx 0-Tθ0），并使轴向功率通过动脉壁传输;（3）径向室壁运动反映Eθ和Tθ0，轴向室壁运动反映Exand（Tx 0-Tθ0）。
With the arterial wall modeled as an initially tensioned thin-walled orthotropic tube, this study aims to analyze radial and axial motion of the arterial wall and thereby reveal the role of axial motion and two initial tensions of the arterial wall in arterial pulse wave propagation. By incorporating related clinical findings into the pulse wave theory in the literature, a theoretical study is conducted on arterial pulse wave propagation with radial and axial wall motion. Since the Young wave is excited by pulsatile pressure and is examined in clinical studies, commonly measured pulsatile parameters in the Young wave are expressed in terms of pulsatile pressure and their values are calculated with the well-established values of circumferential elasticity (Eθ) and initial tension (Tθ0) and assumed values of axial elasticity (Ex) and initial tension (Tx0) at the ascending aorta and the carotid artery. The corresponding values with the exclusion of axial wall motion are also calculated. Comparison of the calculated results between inclusion and exclusion of axial wall motion indicates that (1) axial wall motion does not affect radial wall motion and other commonly measured pulsatile parameters, except wall shear stress; (2) axial wall motion is caused by wall shear stress and radial wall displacement gradient with a factor of (Tx0−Tθ0), and enables axial power transmission through the arterial wall; and (3) while radial wall motion reflects Eθand Tθ0, axial wall motion reflects Exand (Tx0−Tθ0).