A control device (100) for a ventricular assist device (VAD) (50) having a settable velocity level, said control device (100) comprising a ventricular assist device (VAD) (101) configured to receive at least one measurement signal (LVP meas ) relating to a condition, the control device (100) being adapted to receive at least one of the at least one measurement signal (LVP meas ) (EDLVP * ； FG * ) of the at least one characteristic parameter to remove the effect of the physiologically induced variation, but to reduce the effect of the physiologically induced variation, to derive the actual value (EDLVP； FG) -； And an output (105) configured to output an updated set value (n VADset ) for the velocity level, wherein the control device (100) is configured to determine the refined actual value (EDLVP * ； FG * To generate the updated setpoint (n VADset ) based on a point value (EDLVP set ； FG set )； (100). <； / RTI >； In a ventricular assist device (VAD) 50 for heart assistance, the ventricular assist device (VAD) 50 is preferably a non-invasive rotary blood pump, more preferably the blood pump is a catheter- -based). <； / RTI >； CLAIMS What is claimed is: 1. A method for obtaining a refined real value of at least one characteristic parameter of a heart (H), comprising: receiving at least one measurement signal (LVP meas ) related to a physiological condition of a circulatory system of a patient (P)； Deriving an actual value (EDLVP； FG) of at least one characteristic parameter of the heart (H) from one or more of the at least one measurement signal (LVP meas )； (EDLVP； FG) or the at least one measurement signal (LVP meas ) to provide the refined actual value (EDLVP * ； FG * ) where the physiologically induced variation is eliminated or reduced. <； / RTI >； A method of controlling a velocity level of a ventricular assist device (VAD) (50) having a settable velocity level, said method comprising: obtaining said refined actual value of at least one characteristic
