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Abstract

An active implantable medical device, in particular a pacemaker, defibrillator and/or cardiovertor, able to identify and eliminate the artifacts of the detection of cardiac events. This device detects spontaneous events in a ventricular and/or atrial cavity cardiac; measures the intervals separating the successive detected events collected by the detection circuits; analyzes the cardiac rate of heartbeat, according to the measured values of intervals; and eliminates double detections of the same cardiac event, namely when an event detected is followed of an artifact likely to be also detected. The elimination of double detections is performed by seeking to identify an alternation of short intervals (t1, t3, t5, . . . ) and long intervals (t2, t4, t6, . . . ) in the successive measured intervals (t1, t2, t3, t4, t5, t6, . . . ) separating a series of consecutive events (R1, R'1, R2, R'2, R3, R'3, . . . ) collected by the detection circuits and, in the presence of such a proven and regular alternation, to announce that there was double detection. The elimination of double detections can in particular include statistical analysis of the distribution of the aforesaid successive intervals. The identification of the double detection is then used in the analysis of the heart rate to provide the suitable therapy as appropriate.

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