After introducing heart catheterization especially the right heart catheterization according to Grandjean the direct measurement of right ventricular as well as pulmonary artery pressure has been made possible in a relatively simple manner. Thereby the diagnosis cor pulmonale chronicum can be secured or omitted respectively with high confidence. In this regard the exercise--induced increase in pulmonary artery pressure has evident importance especially in case of clinical uncertainty. But because the right heart catheterization is not available in each patient suffering from a pulmonary disease distinct parameters (PaO2, FEV1, pulmonary residual volume, ECG, heart rate) can be used for recognition of the not yet decompensated state of the pulmonary heart disease considering the clinical situation as well as the correlation calculations pointed out by us. With increasing number of implicated functional parameters the security of diagnosis raises.
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