Cardiovascular hemodynamic States supported by a counter-pulsation controlled pulsatile ventricular assist device during arterial fibrillation by using windkessel model

초록

A Phase locked loop(PLL) algorithm for performing counter-pulsation control(CPC) of a Ventricular assist device(VAD) is easy to install in the controller of the VAD. However, Arrhythmia in heart can induce simultaneous pulsation with the VAD and is expected to damage the cardiovascular system. It is necessary to predict and analyze hemodynamic States affected by a CPC-VAD when abrupt tachycardia occurs due to arrhythmia such as Atrial fibrillation(AF) before the application of PLL algorithm. A Windkessel model which reproduced patient's actual blood pressure and flow were used to analysis the patient's hemodynamic States under the condition that the inlet/outlet blood flow of a pulsatile VAD(LibraHeart 1, Cevika Inc., Rep. Of Korea) were same to the measured data from in-vitro experiment, and that patient’s heartbeats were adjusted to the actual electrocardiograms measured from three AF patients. The volume of left ventricle(LV) was predicted and analyzed. The CPC-VAD, which is controlled by PLL during normal beating and AF, decreased the cardiac load by 11.8%~23.9%. Despite the occurrence of failed CPC due to AF, it is expected that the reduction of cardiac load will be maintained, because of the sustaining reduction of LV volume by continuing blood flow from left ventricle into VAD. © 2018 The Korean Society of Mechanical Engineers.

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