Method for determining a risk of cardiac decompensation in a patient

A determination method for determining a risk of cardiac decompensation of a patient, during which a control unit performs a step of processing an accelerometric signal acquired from the patient in order to implement a step of determining a risk of cardiac decompensation based on the study of a plurality of markers including segments of a processed accelerometric signal resulting from said processing step wherein the method of processing the accelerometric signal implemented by the control unit comprises:

• splitting the accelerometric signal into time cycles of a same duration;
• identifying, in each time cycle, segments characteristic of the cardiac sound, with a first search for a first type of segment in a first defined part of the time cycle and a second search for at least a second type of segment and a third type of segment in a second defined part of the time cycle,
• selecting a coherence of the segments identified, at least for the first types of segments and the second types of segments, said selection step consisting of cross-correlating all the segments of the same type identified beforehand in order to be able to deduce a reference segment for this type of segment and to be able, in a second step, to keep only the segments which come closest to the reference segment, which are the coherent segments of each of the types of segment, and
• calculating an average segment of a first type, an average segment of a second type and an average segment of a third type, the average calculation being based on all the segments of a first type selected, respectively all the segments of a second type selected, respectively all the segments of a third type selected,
• wherein the determining step comprises at least one step of determining an increase in the amplitude of the first type of segment relative to data in memory and/or a decrease in the amplitude of the third type of segment relative to data in memory, the control unit being configured to store the average segment of the first type associated with the analysis of the accelerometric signal, and on the other hand, to store the average segment of the second type and the average segment of the third type, associated with the analysis of the accelerometric signal, these average segments representative of the processed accelerometric signal being used for the determining step, during which the changes in the amplitudes of the segments from one signal to the next are analyzed.