An active implantable medical device, in particular a cardiac pacemaker defibrillator and / or cardiovertor type, provided with a function of the double chamber stimulation and of a fallback mode

摘要

The device comprises a desynchronization (14) of the ventricular stimuiation when the atrial rhythm exceeds an acceptable level, and of progressive re-synchronization (22) in the case of a return of the atrial rhythm to the permissible level. The resynchronization condition is controlled so as to be initiated and continued if: (a) is detected (18, 26), no disturbance of the atrial rhythm. & br / according to the invention, the resynchronization is initiated and continued only if, in addition to the condition (a), (b) is detected (20), the presence of a sinus rhythm. & br / advantageously, the resynchronization is initiated and continued only if, in addition to the conditions (a) and (b), (c) is determined (16, 24) that the time remaining, during successive cycles during the phase of resynchronization, between the end of the refractory period post - ear and the end of the atrial escape interval is at least equal to a predetermined duration.