Comparative estimation of central haemodynamics during dynamic load by impedance cardiography and radiocardiography.

77 unselected patients were examined simultaneously by impedance cardiography and radiocardiography in the recumbent position during dynamic exercise (bicycle ergometry). In all cases evaluable impedance curves were registered till the 100 W load. Stroke volume, estimated by impedance cardiography, is at rest and during exercise by about 30% lower compared to its value determined by radiocardiography. However, the percent increase during exercise is not significantly different with the use of either method. The stroke volumes estimated by both methods correlate significantly at rest and during exercise. This fact shows the usefulness of impedance cardiography for estimating central haemodynamics during dynamic exercise.

[Determination of central hemodynamics in dynamic stress using impedance cardiography in comparison to radiocardiography]. / Die Bestimmung der zentralen Hämodynamik unter dynamischer Belastung mittels Impedanzkardiographie im Vergleich zur Radiokardiographie.

77 unselected patients were examined synchronously by impedance and radiocardiography in recumbent position during dynamic exercise. In all cases the load of evaluable impedance curves was possible till 100 watts. Stroke volume, estimated by impedance cardiography, is lower about 30% at rest and during exercise compared to its estimation by radiocardiography. But the percentual increase during exercise is not significantly different between the methods. The stroke volumes, estimated by both methods, correlate significantly at rest and during exercise. This fact shows the usefulness of impedance cardiography for estimating central haemodynamics during dynamic exercise.

[Comparative studies of contractile heart function using impedance, echo-, radio- and apex cardiography]. / Vergleichende Untersuchungen der kontraktilen Herzfunktion mittels Impedanz-, Echo-, Radio- und Apexkardiographie.

89 patients (31 healthy subjects, 31 hypertensives, and 27 patients with coronary heart disease) were examined simultaneously by means of impedance (ICG)-, ultrasonic (UCG)-, radio (RCG)-, and calib. and diff. apex cardiography (cACG). There were found significant correlations between the ICG-, UCG-, and RCG-parameters, all describing the heart function in the auxotonic ejection phase. Whereas there were no significant correlations between the methods mentioned and the cACG. Of all investigated parameters in hypertensives only the quotient A/S of cACG is significantly increased compared with persons with healthy heart and circulation. In patients with coronary heart disease all the parameters of the auxotonic ejection phase are significantly decreased, the isometric contraction time and the quotient A/S are increased.