2016/07/27 by Arthur Ghigo, Ghigo, Arthur, Xiaofei Wang +7
Medicine · Engineering · #Cardiovascular Health and Disease Prevention #Elasticity and Material Modeling #Coronary Interventions and Diagnostics
paper · pdf · doi:10.48550/arxiv.1607.07973
This work deals with the viscoelasticity of the arterial wall and its\ninfluence on the pulse waves. We describe the viscoelasticity by a non-linear\nKelvin-Voigt model in which the coefficients are fitted using experimental time\nseries of pressure and radius measured on a sheep's arterial network. We\nobtained a good agreement between the results of the nonlinear Kelvin-Voigt\nmodel and the experimental measurements. We found that the viscoelastic\nrelaxation time-defined by the ratio between the viscoelastic coefficient and\nthe Young's modulus-is nearly constant throughout the network. Therefore, as it\nis well known that smaller arteries are stiffer, the viscoelastic coefficient\nrises when approaching the peripheral sites to compensate the rise of the\nYoung's modulus, resulting in a higher damping effect. We incorporated the\nfitted viscoelastic coefficients in a nonlinear 1D fluid model to compute the\npulse waves in the network. The damping effect of viscoelasticity on the high\nfrequency waves is clear especially at the peripheral sites.\n