Method for the measurement of the cardiac flow, in which the volume of blood ejected from the left ventricle (LSV) or the volume of blood ejected from the right ventricle (RSV) is espresse and calculated as a function of at least one of the independent contributing factors of the area under the pressure curve recorded by menas o fan appropriate sensor and as a function of the hydraulic impedance, and in which th cardiac flow Q is calcuated according to the relation Q = LSV (or RSV) *HR, where HR = Heart Rate.