Patent ID: 7076297
Filing Date: 2006-07-11
Classification: A61N

Abstract:
1. An active implantable medical device comprising: means for detecting spontaneous atrial and ventricular events, including means for detecting an occurrence of ventricular extrasystoles among detected spontaneous ventricular events, means for stimulating the atrium, including means for calculating an atrial escape interval, means for starting to count said calculated atrial escape interval on detection of an atrial event, and means for delivering an atrial stimulation at the end of the counted atrial escape interval if no spontaneous atrial event is detected in said atrial escape interval, means for defining a critical period relative to the end of the calculated atrial escape interval, means for determining, in response to a detected ventricular extrasystole, whether the detected ventricular extrasystole is during said critical period, means for recognizing a risk condition of inappropriate operation and/or false diagnosis of the device based upon the temporal proximity of the detected ventricular extrasystole to the end of the atrial escape interval, and means, responsive to a recognized risk condition, for modifying an operating parameter of the device so as to eliminate said recognized risk condition.