Static Anisotropic Elastic Properties of the Aorta in Living Dogs
Static Anisotropic Elastic Properties of the Aorta in Living Dogs
复制标题
活体狗主动脉的静态各向异性弹性特性
作者：
D. J. Patel;J. S. Janicki;T. Carew
研究了 14 只活体狗胸主动脉中部的静态各向异性弹性。使用特殊传感器来测量孤立血管段中多个压力下的半径和纵向应力。根据这些数据，计算描述血管壁弹性特性的模量。结果表明：（1）在生理压力为154 cm H2O（周向伸长比为1.52）时，径向、周向和纵向增量弹性模量的平均值分别为5480、7510和10,100 g/cm2； (2)这些模量随着血管内压力的增加而增加； (3)在体外研究血管时纵向模量下降（由于纵向系绳的去除）。
Static anisotropic elasticity was studied in the middle descending thoracic aorta of 14 living dogs. Special transducers were used to measure radius and longitudinal stress at several pressures in situ in an isolated vessel segment. From these data, moduli describing elastic properties of the vessel wall were calculated. Results indicate that (1) at a physiologic pressure of 154 cm H2O (extension ratio of 1.52 circumferentially) the mean values for the incremental elastic moduli in the radial, circumferential, and longitudinal directions were 5480, 7510, and 10,100 g/cm2, respectively; (2) these moduli increased with an increase in intravascular pressure; and (3) the longitudinal modulus decreased when the vessel was studied in vitro (from the removal of longitudinal tethering).