Key result
Lossless branched transmission line model closely simulates aortic and peripheral arterial blood velocities.
Why the study?
The study aimed to simulate blood velocity measurements in the aorta and peripheral arteries of normal subjects using a computer model based on an electrical transmission line.
Electrical analog model may guide aortic hemodynamics research; leaves open clinical validation before any application.
A computer model of the aorta and its branches was made based on a simulation of an electrical transmission line using T elements. The model represented the aorta, with branches to the arms and legs and a branch to the head. The values for the capacitance and inductance of each T element could be specified, and a linearly increasing left ventricular pressure was used to drive the model. Transmission line equations were used to select values for the components, and an attempt was made to simulate the results of measurements of blood velocity in the aorta and peripheral arteries of normal subjects. The values obtained with the model showed a close relation to those in experimental studies. The results support the hypothesis that the arterial bed can be well represented by a "lossless" branched transmission line, with impedances matched at each branch and terminated with resistances that give a reflection coefficient of 0.5. A driving function, in which a linearly increasing left ventricular pressure provided a transient input to an aortic root of relatively low impedance, gave the best simulation of the experimental results.
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McIlroy et al. (1986) studied Normal aortic and peripheral arterial blood velocity. Computer simulation of the aorta using an electrical transmission line model with T elements vs. Experimental measurements of blood velocity in normal subjects was evaluated on Simulation of blood velocity measurements in the aorta and peripheral arteries. A lossless branched transmission line computer model with a terminal reflection coefficient of 0.5 closely simulated experimental aortic and peripheral arterial blood velocity measurements.
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