Study on regurgitation using the coupling model of left ventricular assist device and cardiovascular system

被引：2

作者：

Wang, Fangqun ^{[1
]}

Wu, Zhenhai ^{[1
]}

Jing, Teng ^{[2
]}

Xu, Qing ^{[3
]}

Yao, Jinhao ^{[3
]}

Ji, Jinghua ^{[3
]}

机构：

[1] Department of Biomedical Engineering, School of Electrical and Information Engineering, Jiangsu University, Zhenjiang,Jiangsu,212013, China

[2] Department of Biomedical Engineering, School of Fluid Machinery and Technology, Jiangsu University, Zhenjiang,Jiangsu,212013, China

[3] Department of Electrical Engineering and Automation, School of Electrical and Information Engineering, Jiangsu University, Zhenjiang,Jiangsu,212013, China

来源：

Shengwu Yixue Gongchengxue Zazhi/Journal of Biomedical Engineering | 2017年 / 34卷 / 05期

关键词：

Cardiovascular system - Grading - Speed;

D O I：

10.7507/1001-5515.201702033

中图分类号：

学科分类号：

摘要：

Regurgitation is an abnormal condition happens when left ventricular assist devices (LVADs) operated at a low speed, which causes LVAD to fail to assist natural blood-pumping by heart and thus affects patients' health. According to the degree of regurgitation, three LVAD's regurgitation states were identified in this paper: no regurgitation, slight regurgitation and severe regurgitation. Regurgitation index (RI), which is presented based on the theory of dynamic closed cavity, is used to grade the regurgitation of LVAD. Numerical results showed that when patients are in exercising, resting and sleeping state, the critical speed between slight regurgitation and no regurgitation are 6650 r/min, 7000 r/min and 7250 r/min, respectively, with corresponding RI of 0.401, 0.300 and 0.238, respectively. And the critical speed between slight regurgitation and severe regurgitation are 5500 r/min, 6000 r/min and 6450 r/min, with corresponding RI of 0.488, 0.359 and 0.284 respectively. In addition, there is a negative relation correction between RI and rotational speed, so that grading the LVAD's regurgitation can be achieved by determining the corresponding critical speed. Therefore, the detective parameter RI based on the signal of flow is proved to be able to grade LVAD's regurgitation states effectively and contribute to the detection of LVAD's regurgitation, which provides theoretical basis and technology support for developing a LVADs controlling system with high reliability. Copyright © 2017 by Editorial Office of Journal of Biomedical Engineering.

引用

页码：752 / 759