The invention relates to a determination system (1) for determining a heart failure risk for a subject (4). The determination system is adapted to provide a cardiogram selected from a group consisting of a ballistocardiogram, a seismocardiogram and an impedance cardiogram of the subject, to detect at least one of a presence of a postextrasystolic potentiation (PESP) and a disturbed force-frequency relation (FFR) based on the provided cardiogram and to determine the heart failure risk based on this detection. By using the detection of the presence of the PESP and/or of a disturbed FFR, the heart failure risk can be reliably determined. In particular, it can be determined that the heart failure risk is relatively large, if a PESP is not present and/or if the FFR is disturbed.
