Comparative Measures Of Systolic Ejection During Treadmill Exercise By Impedance Cardiography And Doppler Echocardiography

Patients with chest pain admitted for elective coronary angiography were monitored by simultaneous impedance cardiography and Doppler echocardiography before, during, and after treadmill exercise. Ensemble-averaged ECG, dZ/dt, AZ and Doppler waveforms were analyzed to identify systolic ejection variables. Cardiac impedance signals were well correlated to Doppler indices of systolic event timing and ejection dynamics.