System and a computer program for the determination of quantities relating to the circulatory system of a patient

摘要

A system for the determination of quantities relating to the circulatory system of a patient comprises a device for the non-invasive measurement of the qualitative variation over time of the local concentration of an indicator injected into the blood circulation system at a first position, the measurement taking place at a second position of the blood circulation system. Furthermore, an evaluating unit is provided which comprises an input interface for reading in an input value of the cardiac output COe of the patient, and in which there is implemented an evaluating algorithm which transforms the qualitative variation over time of the local concentration of the indicator injected into the blood circulation system into a quantitative variation over time of the local concentration of the indicator injected into the blood circulation system. For the purposes of the transformation, the condition is fulfilled that the cardiac output C0dye calculable from the quantitative variation over time of the local concentration in accordance with a predetermined relationship is equal to the input value of the cardiac output COe. A calibration of the indicator concentration measurement process can be effected by using this system. Amongst others, the circulating volume of blood can be determined using the so obtained quantitative indicator concentration curve.