1. A computer-implemented method of assessing cardiac function within a living subject, comprising: obtaining: (i) acoustic information relating to the cardiac system of said subject, the acoustic information including a heart sound; (ii) electrocardiographic (ECG) information relating to said subject; and (iii) impedance cardiographic (ICG) information relating to said subject; using the ECG information to validate a timing of the heart sound of the acoustic information so as to provide a validated sound event of the acoustic information; using the validated sound event of the acoustic information to detect a fiducial point of the ICG information; and utilizing said acoustic, ECG and ICG information substantially in concert to assess cardiac function.