The Origin of the Variations of Body Impedance Occurring during the Cardiac Cycle
If the trunk is placed between two electrodes of a high frequency circuit, changes in impedance occur during the cardiac cycle. Experiments are presented which show that these variations do not result from the actual volume changes of the heart, as has been suggested in the literature. The changes in impedance are caused by the rhythmic variations in blood content of the vessels.
- © 1952 American Heart Association, Inc.