[Angiocinedensitometry with ECG-controlled injections in patients with healthy kidneys and kidney tumors].

According to the method, the necessary equipment and actual attainment of measurements, the results of cinedensitometric evaluations are discussed. The results are based on angiographic examinations of 80 patients (41 hypernephroma and 39 normal kidneys) who have been studied using X-ray cinedensitometry. It could be proven that with the ECG-triggered injection of contrast-medium, measurements of the pulsatile flow in the renal artery during the various periods of heart-motions could be performed with a high degree of accuracy. Curves of the velocity of the bloodflow are therefore attainable. The average velocities of bloodflow show normal values of 8.5 ml/s in normal kidneys, which means 570 ml/min. In hypernephromas, there were increased velocities of bloodflow measuring up to 1400 ml/min, that is a maximal flow of 760 ml/min. Depending upon the pulsatile flow the curves of the bloodflow velocity are very distinctive. The examples of values of bloodflow velocity in hypertrophic kidneys or in hypervascularized renal tumors support these findings. The lower the measured flow velocity is, the more uniform the pattern of the flow profile will be.