[ECG and hemodynamic changes during the bicycle ergometry of patients following aortic valve prosthesis]

Interrelated ECG and hemodynamic changes were revealed in an analysis of the results of a bicycle ergometry test (BET) with the recording of ECG in 12 accepted leads and simultaneous impedance rheoplethysmography after Kubichek in 60 patients during rehabilitation for 3 yrs after aortic valve replacement. Impedance-measuring investigation of hemodynamics after physical exercise provided valuable information on causes of ECG changes. More frequent development of ischemic changes during rehabilitation and a variety of hemodynamic causes of changes in physical exercise and in the period of restitution necessitated intermittent BET in patients with a prosthesis of the aortic valve. An increase in voltage of the R wave during BET was combined in most cases with other inadequate hemodynamic reactions and was accompanied by an "ischemic" decrease in ST, and could serve as an additional criterion of threshold exercise.