2018 Volume Annual56 Issue Abstract Pages S315
The beat synchronized control has the advantage of ventricular unloading by increasing pump speed at systolic phase. However this advantage cannot be obtained when the timing is delayed. The aims of this study are to investigate the influence of synchronization delay on ventricular load and to propose the online evaluation method for the lag. In the case that the pump flow was obtained, it was possible to detect the time lag from systole and the instant of pump speed change. From the point of view of the pump model equations, the second order differential value of motor current has the information of the relationship between change in pump flow and speed during ramp-wise change in rotational speed. The experimental results indicated that the lag may be able to be evaluated without pump flow by using the second differential value of motor current while pump speed increased.
