Numerical assessment of time-domain methods for the estimation of local arterial pulse wave speed

TY - JOUR

T1 - Numerical assessment of time-domain methods for the estimation of local arterial pulse wave speed

AU - Alastruey, Jordi

PY - 2011/3/15

Y1 - 2011/3/15

N2 - A local estimation of pulse wave speed c, an important predictor of cardiovascular events, can be obtained at arterial locations where simultaneous measurements of blood pressure (P) and velocity (U), arterial diameter (D) and U, flow rate (Q) and cross-sectional area (A), or P and D are available, using the PU-loop, sum-of-squares (Sigma(2)), InDU-loop, QA-loop or new (DP)-P-2-loop methods. Here, these methods were applied to estimate c from numerically generated P. U, D, Q and A waveforms using a visco-elastic one-dimensional model of the 55 larger human systemic arteries in normal conditions. Theoretical c were calculated from the parameters of the model. Estimates of c given by the loop methods were closer to theoretical values and more uniform within each arterial segment than those obtained using the Sigma(2). The smaller differences between estimates and theoretical values were obtained using the (DP)-P-2-loop method, with root-mean-square errors (RMSE) smaller than 0.18 m s(-1), followed by averaging the two c given by the PU- and InDU-loops (RMSE < 2.99 m s(-1)). In general, the errors of the PU-, InDU- and QA-loops decreased at locations where visco-elastic effects were small and nearby junctions were well-matched for forward-travelling waves. The Sigma(2) performed better at proximal locations. 

AB - A local estimation of pulse wave speed c, an important predictor of cardiovascular events, can be obtained at arterial locations where simultaneous measurements of blood pressure (P) and velocity (U), arterial diameter (D) and U, flow rate (Q) and cross-sectional area (A), or P and D are available, using the PU-loop, sum-of-squares (Sigma(2)), InDU-loop, QA-loop or new (DP)-P-2-loop methods. Here, these methods were applied to estimate c from numerically generated P. U, D, Q and A waveforms using a visco-elastic one-dimensional model of the 55 larger human systemic arteries in normal conditions. Theoretical c were calculated from the parameters of the model. Estimates of c given by the loop methods were closer to theoretical values and more uniform within each arterial segment than those obtained using the Sigma(2). The smaller differences between estimates and theoretical values were obtained using the (DP)-P-2-loop method, with root-mean-square errors (RMSE) smaller than 0.18 m s(-1), followed by averaging the two c given by the PU- and InDU-loops (RMSE < 2.99 m s(-1)). In general, the errors of the PU-, InDU- and QA-loops decreased at locations where visco-elastic effects were small and nearby junctions were well-matched for forward-travelling waves. The Sigma(2) performed better at proximal locations. 

KW - Pulse wave propagation

KW - Arterial stiffness

KW - One-dimensional modelling

KW - Voigt-type visco-elasticity

KW - Well-matched bifurcations

U2 - 10.1016/j.jbiomech.2010.12.002

DO - 10.1016/j.jbiomech.2010.12.002

M3 - Article

SN - 0021-9290

VL - 44

SP - 885

EP - 891

JO - Journal of Biomechanics

JF - Journal of Biomechanics

IS - 5

ER -