Patent ID: 7483745
Filing Date: 2009-01-27
Classification: A61N

Abstract:
1. An active implantable medical device, comprising: circuit means for detecting spontaneous atrial and ventricular events; circuit means for providing ventricular and atrial stimulation; and means for automatic mode commutation; means for suspecting a loss of an atrial detection or capture, comprising means for determining a sequence of events having one or more of provided stimulations and detected ventricular and atrial events, and means for analyzing said sequence to detect a condition indicative of a suspected loss of atrial detection, wherein said analyzing means further comprises means for determining an occurrence of a ventricular extrasystole with a coupling interval that is greater than a programmed value, wherein said condition corresponds to one of said ventricular extrasystole being detected in the presence of said greater coupling interval and an occurrence of an atrial detection consecutive to an atrial stimulation over a predetermined number of successive cardiac cycles; and means for avoiding inappropriate switching to a DDD pacing mode when a condition indicative of a suspected loss of atrial detection is detected, comprising increasing means for increasing sensitivity after suspecting the loss of an atrial detection or capture.