Patent ID: 8874210

Claim:
An active implantable medical device for stimulation, resynchronization and/or defibrillation of a patient, comprising: means for detecting spontaneous atrial and ventricular events; means for delivering ventricular and atrial stimulation; means for detecting spontaneous ventricular depolarization after an atrial pacing; means for measuring an atrioventricular delay between the atrial pacing and the corresponding ventricular depolarization; means for operating the device in a dual chamber mode with ventricular sensing and ventricular pacing in the absence of spontaneous ventricular depolarization detected after an atrioventricular delay; means for mode switching, to control conditionally, according to a predetermined criteria, the switching of the device between a dual chamber mode and a pacing mode favoring a spontaneous atrioventricular conduction; a hemodynamic sensor having an output signal; means for deriving from the output signal a hemodynamic index representative of a patient's tolerance to the atrioventricular delay, wherein the means for deriving utilizes output data from the hemodynamic sensor associated with a single cardiac cycle to derive the hemodynamic index, wherein the means for deriving the hemodynamic index is configured to derive the hemodynamic index when the atrioventricular delay exceeds a threshold value; and means for inhibiting or forcing said conditional switching of the device to the dual chamber mode based on said hemodynamic index derived from the output data from the hemodynamic sensor associated with the single cardiac cycle.