Estimation of the local fraction of cardiac output using a two-phase model of pulsatile hemodynamics

Estimation of the pulsatile component of stroke volume (SV) with thoracic rheography cannot be explained by the existing single-phase model of pulsatile hemodynamics, the theory of passive diastole, but can be satisfactorily explained by a two-phase model, the theory of active diastole. The local fraction of cardiac output, an original rheographic parameter for measuring blood flow in the examined area, is suggested, which can be calculated in the same way as the pulsatile component of SV but by a simpler formula and can be used for any region of the cardiovascular system.