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- W2000293844 abstract "Axial-flow blood pumps used as LVAD usually run at a constant speed. Varying venous return can lead to the complete emptying of the left ventricle and suction of myocardial tissue. Adequate control should avoid suction. Principles of suction as well as cardiac interaction with the assist pump have been studied using a non-linear dynamic model of the left ventricle, aorta, cannulation and pump. The volume-dependent contractility of the ventricle interacted with the pump and a varying pulsatility of the pressure head could be simulated, depending on the filling condition and pump speed. Suction was characterized as a repeated transition between emptying, occlusion, refilling and opening of the ventricle. The suction control combines alleviation of acute suction with prophylaxis of suction. An acute suction event is detected by appropriate filtering of the dynamic pressure head signal. Upon detection of a suction spike the rotation speed is greatly reduced and is increased gradually to the original value. Suction prophylaxis is based on the control of the pulsatility of the pressure head, which is related to the ventricular volume. The estimated pulsatility is kept higher than a target value by reducing the speed. Both the model and the effectiveness of the control system have been validated in simulations based on data captured from a group of 10 patients supported by an axial flow pump. Suction control is expected to facilitate the delicate selection of the ideal rotation speed by the physician, thus enhancing the ability to handle higher peak flows without fear of suction." @default.
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- W2000293844 date "2003-03-01" @default.
- W2000293844 modified "2023-09-25" @default.
- W2000293844 title "SUCTION-FREE OPERATION OF AN AXIAL FLOW BLOOD PUMP WITH A MAGNETICALLY SUSPENDED ROTOR" @default.
- W2000293844 doi "https://doi.org/10.1097/00002480-200303000-00064" @default.
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