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Abstract

The invention relates to a device for determining cardiopulmonary volumes and flows of a living being. According to the invention, the evaluation unit (14) of a transpulmonary measurement arrangement, preferably having a central-vein catheter and an arterial catheter (11, 12), is set up, in terms of program technology, for the purpose of taking a possible short-circuit current from the right to the left half of the heart (RL shunt) and/or from the left to the right half of the heart (LR shunt) of the living being into consideration, without the use of a right-heart catheter being required in this connection, or any recourse to pulmonary artery measurement values having to take place at all. In this connection, a model is used as the basis, which contains the function y (system response) corresponding to a dilution curve as the convolution of a disruption function I with several terms that contain characteristic times as model parameters. The terms correspond to ideally mixed volumes or delay elements that are assumed as simplifications for the right atrium (RA), the right ventricle (RV), the pulmonary blood volume (PBV), the extravasal thermal volume (ETV), the left atrium (LA), and the left ventricle (LV).

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First Claim