Abstract
The estimation and monitoring system of the cardiovascular dynamics under ventricular assist device (LVAD) pumping has been developed on the basis of a time series model. This system has the functions which can identify the parameters of the cardiovascular dynamics such as peripheral vessel resistance and arterial compliance beat by beat and can estimate the instantaneous value of the cardiac output of the natural heart assisted by the LVAD. The required measurements are only the aortic pressure and the outflow rate from the LVAD measured with an electromagnetic flow meter outside the body. In this system, the parameter identification of the cardiovascular dynamics and the estimation of the flow rate wave form of the cardiac output can be realized in an on-line and real time fashion. Hence, the proposed system is useful for monitoring the hemodynamic behavior of the circulatory system supported by the LVAD and for developing an automatic control system in which the driving conditions are automatically changed on the basis of the estimated cardiac output.
