Patients receiving cardio-toxic cytostatic agents are examined by Doppler-echocardiography and acoustic cardiography before, during, and after the cytostatic treatment. Doppler-echocardiography measures ejection fraction, TDI, speckle tracking, and further parameters. Acoustic cardiography (Audicor, Inovise Medical Inc., Portland, USA) simultaneously integrates heart sounds and single-channel electrocardiography input to generate multiple parameters that correlate to established hemodynamic measures. Heart function as assessed by Doppler-echocardiography is then compared to the heart function as assessed by Audicor ECG.