Pulse wave propagation in a model human arterial network: Assessment of 1-D visco-elastic simulations against in vitro measurements

JOURNAL OF BIOMECHANICS

卷:44

Article

Alastruey, Jordi^1,2  Khir, Ashraf W.³  Matthys, Koen S.³  Segers, Patrick⁴  Sherwin, Spencer J.²  Verdonck, Pascal R.⁴  Parker, Kim H.¹  Peiro, Joaquim² 

[1] Univ London Imperial Coll Sci Technol & Med, Dept Bioengn, London SW7 2AZ, England

[2] Univ London Imperial Coll Sci Technol & Med, Dept Aeronaut, London SW7 2AZ, England

[3] Brunel Univ, Sch Engn & Design, Uxbridge UB8 3PH, Middx, England

[4] Univ Ghent, Cardiovasc Mech & Biofluid Dynam CMBD Res Unit, Inst Biomed Technol, Ghent, Belgium

关键词: Pulse wave propagation;    Experimental modelling;    One-dimensional modelling;    Time-domain formulation;    Voigt-type visco-elasticity;    Systemic arterial tree;   

DOI  :  10.1016/j.jbiomech.2011.05.041

来源: Elsevier

【 摘 要 】

The accuracy of the nonlinear one-dimensional (1-D) equations of pressure and flow wave propagation in Voigt-type visco-elastic arteries was tested against measurements in a well-defined experimental 1:1 replica of the 37 largest conduit arteries in the human systemic circulation. The parameters required by the numerical algorithm were directly measured in the in vitro setup and no data fitting was involved. The inclusion of wall visco-elasticity in the numerical model reduced the underdamped high-frequency oscillations obtained using a purely elastic tube law, especially in peripheral vessels, which was previously reported in this paper [Matthys et al., 2007. Pulse wave propagation in a model human arterial network: Assessment of 1-D numerical simulations against in vitro measurements. J. Biomech. 40, 3476-3486]. In comparison to the purely elastic model, visco-elasticity significantly reduced the average relative root-mean-square errors between numerical and experimental waveforms over the 70 locations measured in the in vitro model: from 3.0% to 2.5% (p < 0.012) for pressure and from 15.7% to 10.8% (p < 0.002) for the flow rate. In the frequency domain, average relative errors between numerical and experimental amplitudes from the 5th to the 20th harmonic decreased from 0.7% to 0.5% (p < 0.107) for pressure and from 7.0% to 3.3% (p < 10(-6)) for the flow rate. These results provide additional support for the use of 1-D reduced modelling to accurately simulate clinically relevant problems at a reasonable computational cost. (C) 2011 Elsevier Ltd. All rights reserved.

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