Patent ID: 7797045

Claim:
An active implantable medical device of a cardiac pacemaker, defibrillator and/or cardioverter type, comprising: means for pacing the ventricle and atrium; means for detecting atrial events (A); means for detecting ventricular events (R, r), operating with the application of a safety window following the delivery of an atrial pacing pulse; means for operating the device in AAI mode with ventricular sensing, or in DDD mode; means for mode commutation conditionally performing commutation from AAI to DDD mode; means for diagnosing an atrio-ventricular conduction disorder by determining the appearance of an atrio-ventricular block based upon a sequence of atrial events (A) not followed, during one atrial escape interval, by the detection of a corresponding ventricular event (R) out of said safety window; means for discriminating ventricular events by detecting the occurrence of at least one ventricular event (r) during the safety window, in the absence of an atrio-ventricular block detected by said means for diagnosing an atrio-ventricular conduction disorder, wherein said means for discriminating ventricular events comprises means for placing in a timing diagram event markers representative of the atrial events and the ventricular events, the means for placing event markers, in case of mode commutation from AAI to DDD mode in the absence of the atrio-ventricular block, positioning a first marker in the timing diagram and associating the first marker to said mode commutation, said first marker being representative of a commutation from AAI mode to DDD mode not related to an atrio-ventricular block; and a memory storing an electrogram (EGM) during a cycle associated with the first marker.