Abstract: A device for processing spatiotemporal dispersion signals of electrocardiograms. The device comprising a memory configured to receive spatiotemporal dispersion signals of electrocardiograms associated with a time marker and an electrocardiogram track. The device comprising a calculator configured to receive as input an electrogram track identifier and a time marker, to analyse the spatiotemporal dispersion signal of electrocardiograms associated with this electrogram track identifier, analyse a signal extract comprised between the time marker and the first previous time marker whose spatiotemporal dispersion signal value of electrocardiograms indicates a lack of dispersion, derive from this signal extract a flatness value of the signal, and a duration value derived from the duration of the signal extract, and feed back a track priority value calculated from the flatness value and the duration value.