[Evaluation of measurement accuracy in microcatheterization of the heart]

In 192 patients with silicosis the results of the cardiac micro-catheterisation under conditions of rest were compared with those ones of a secondary examination performed two years later. This allows conclusions to the behaviour of the pressure values measured in the period observed as well as to the evidence of an individual cardiac micro-catheterisation. No essential increase of the mean pressure of the pulmonary artery was observed. The dispersion of an individual measurement is 3 Torr. A pulmonary hypertension, which is given from 20 Torr upwards, consequently may be established with a 95% statistical certainty only from an individual measuring value of 26 Torr.