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Effects of Different Blood Flow Models on the Determination of Arterial Characteristic Impedance

机译:不同血流模型对动脉特征阻抗测定的影响

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Within the concept of pulse wave analysis, arterial pressure and flow curves over a whole cardiac cycle are analyzed. The ratio of pressure to flow in the frequency domain is called impedance. The characteristic impedance (Z_c) is obtained when pressure and flow waves are not influenced by wave reflection. The aim of this work is to evaluate the effects of different blood flow models on the determination of the characteristic impedance compared to flow curves gained from ultrasound measurements. The simplest model to approximate aortic blood flow is a curve of triangular shape. Another approach is to use an averaged flow curve from readings of different subjects, and recently a new blood flow model based on Windkessel theory was developed (ARCSolver flow model). In a study population of 148 patients for the evaluation of the different models the input impedance and subsequently the characteristic impedance is calculated in the frequency domain. The mean characteristic impedance using flow curves from ultrasound images is 0.22 (0.08 SD) AU. For the triangular flow a mean difference to the ultrasound flow for Z_c of -0.148 (0.097 SD) is found. For the averaged flow a mean difference for Z_c of 0.027 (0.036 SD) AU and for the ARCSolver flow a mean difference of 0.016 (0.039 SD) AU compared to the ultrasound flow is obtained. These results indicate that the characteristic impedance strongly depends on the accuracy of the used flow model. While the averaged and the ARCSolver flow provide good estimates for impedance, the triangular flow curve seems to be too simplistic for getting accurate values.
机译:在脉搏波分析的概念范围内,分析了整个心动周期的动脉压和流量曲线。频域中流动的压力比称为阻抗。当压力和流浪波不受波反射的影响时获得特征阻抗(Z_C)。这项工作的目的是评估不同血流模型对与超声测量中获得的流动曲线相比的特征阻抗的效果。近似主动脉血流的最简单模型是三角形形状的曲线。另一种方法是使用来自不同受试者的读数的平均流量曲线,最近开发了基于Windkessel理论的新血流模型(ArcSolver流程模型)。在148名患者的研究人群中,评估不同模型的输入阻抗,随后在频域中计算特征阻抗。使用来自超声图像的流量曲线的平均特征阻抗是0.22(0.08SD)Au。对于三角形流,发现与-0.148(0.097SD)的Z_C的超声波流的平均差异。对于平均流量,Z_C的平均差异为0.027(0.036 SD)Au和弧光流量的平均差异与超声波流量相比的0.016(0.039SD)Au。这些结果表明,特征阻抗强烈取决于所用流量模型的准确性。虽然平均和ArcSolver流量为阻抗提供了良好的估计,但是三角形流量曲线似乎太简单而无法获得准确的值。

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