Patent ID: 6343231
Filing Date: 2002-01-29
Classification: A61N

Abstract:
An active implantable medical device having a DDD operating mode and an AAI operating mode and an automatic mode switching operation including:means for detecting spontaneous atrial and ventricular events including an atrio-ventricular conduction; means for determining a heart rate from the detected events; means for providing a programmed atrio-ventricular delay in response to one of an atrial stimulation and a detected spontaneous atrial event; and means for ventricular and atrial stimulation, said ventricular stimulation being applied in response to an absence of a detection of an atrio-ventricular conduction following said provided programmed atrio-ventricular delay, wherein the improvement comprises: means for discriminating between a phase of effort and a phase of rest; means for measuring an atrio-ventricular conduction time separating an atrial event from a consecutive corresponding spontaneous ventricular event, wherein the atrial event is one of a spontaneous and a stimulated event; and means for diagnosing one of a good adaptation and a bad adaptation of the conduction time during the determined effort, including means for evaluating a conduction time variation in relation to a variation of the heart rate during said effort.