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首页> 外文期刊>Journal of Biomechanics >A computational study on the influence of catheter-delivered intravascular probes on blood flow in a coronary artery model.
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A computational study on the influence of catheter-delivered intravascular probes on blood flow in a coronary artery model.

机译:冠状动脉模型中导管输送的血管内探针对血流影响的计算研究。

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摘要

Catheter-delivered intravascular probes are widely used in clinical practice to measure coronary arterial velocity and pressure, but the artefactual effect of the probe on the variables being measured is not well characterised. A coronary artery was simulated with a 180 degrees curved tube 3mm in diameter and the effect of catheters of different diameters was modelled numerically under pulsatile flow conditions. The presence of a catheter increased pressure by 1.3-4.3mmHg depending on its diameter, and reduced velocity-pressure phase-lag. For an ultrasound sample volume 5mm downstream from the probe tip, the underestimation in velocity measurement attributed to catheter blockage is approximately 15-21% for an average inlet velocity of 0.1m/s. The velocity measurement error is lower at higher mean flow velocity. Accuracy of clinical velocity measurements could be improved by moving the sample volume farther downstream from the probe tip, because the centrifugal pressure gradient intrinsic to the curvature promotes re-development of flow.
机译:导管输送的血管内探针在临床实践中被广泛用于测量冠状动脉的速度和压力,但是探针对所测量变量的人为作用尚未得到很好的表征。用直径为3mm的180度弯曲管模拟冠状动脉,并在脉动流动条件下对不同直径的导管的作用进行数值模拟。导管的存在取决于其直径,使压力增加了1.3-4.3mmHg,并降低了速度-压力的相位滞后。对于探头尖端下游5mm处的超声样品量,由于平均入口速度为0.1m / s,在速度测量中由于导管阻塞而造成的低估约为15-21%。在较高的平均流速下,速度测量误差较低。通过将样品体积从探针尖端向下游移动,可以提高临床速度测量的准确性,因为曲率固有的离心压力梯度会促进血流的重新发展。

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