[Systolic time intervals during sequential ultrafiltration and hemodialysis]

The effects of a forced withdrawal of fluid by ultrafiltration and the influences of a connected haemodialysis on the period of isometric contraction of the heart were recorded by periodical registration during the treatment. A statistically certain decrease of the LVET (-19.2%) and an increase of the PEP (+ 11.1%) were found. Since at least in the period of the isolated ultrafiltration several essential parameters of the interior milieu do not change decisively, as cause for the changes observed of the systolic intervals of the heart period the decrease of the preload is discussed. During the period of ultrafiltration on an average 15.3 +/- 3.3 ml of plasma water were taken per minute.