A Model Study of Stroke Volume Values Calculated from Impedance and Their Relation to the Waveform of Blood Flow

By means of a computer simulation, cardiac stroke volume measured with Kubicek's impedance method (SVz) was evaluated against aortic flow waveform. SVz varied remarkably with the change in the shape of aortic flow-wave whose stroke volume was held constant. SVz was equal to the stroke volume only when the flow-wave was square.