Abstract: A method for carrying out hemodynamic measurements on a patient, using a low-directed balloon catheter, which is connected to a measuring unit and is at least provided with a distal measuring lumen and a balloon-inflating lumen, comprising the steps of inserting the catheter by way of a suitable vein and further by way of the right atrium and ventricle into the pulmonary artery until the distal end with the inflated balloon in wedge position is stuck in a branch thereof and closes off the latter. A proximal measuring lumen is provided a few centimeters apart from the distal measuring lumen. Then the pulmonary arterial pressure (PAP) is measured, as long as the catheter has not yet arrived in the wedge position, via both the proximal and distal measuring lumina and the two relevant, virtually identical pressure curves are simultaneously recorded.