Device for determining a length of a cardiac activation cycle

A device for determining a cardiac activation cycle length comprising a memory arranged so as to store electrogram data having time stamps and associated with a channel, a preparer arranged so as to receive electrogram data associated with a given channel and with a time window of at least 1.5 seconds, to extract therefrom baseline noise and high-frequency noise and to provide pre-processed data, a detector arranged so as to receive the pre-processed data and to detect therein non-overlapping activation segments that each correspond to a window within said time window of at least 1.5 seconds, which detector operates by determining local extrema in the pre-processed data and by grouping them into activation segments, and a computer arranged so as to determine a periodicity condition of the activations by determining in each activation segment a reference time point and by comparing the duration of intervals each defined by two reference time points consecutive to the duration of the time window of at least 1.5 seconds, and, in case of a periodicity condition indicating periodic activation segments, to determine an activation cycle length from the average or the median of the interval durations,

• the detector being arranged so as to perform a post-processing by segmenting the intervals into three groups according to their duration, by searching for local extrema in the electrogram data corresponding to the intervals of the group of longest durations, and, where appropriate, by completing the activation segments with activation segments derived from these extrema.