Patent ID: 7113826
Filing Date: 2006-09-26
Classification: A61N

Abstract:
1. An active implantable medical device for monitoring cardiac activity in a patient having means for detecting ventricular events, means for detecting atrial events, means for indicating a delivery of a ventricular stimulation pulse and a delivery of an atrial stimulation pulse, means for inhibiting the atrial event detection means from detecting atrial events for a first post-ventricular atrial absolute refractory period in response to a detection of a ventricular event, the atrial event detecting means further comprising a sensitivity and a detection threshold and means for protecting against a detection of atrial signals not corresponding to an atrial event that has actually occurred; wherein the improvement comprises: first means for temporarily raising the detection threshold of the atrial event detecting means by a first increment for a first length of time in response to the ventricular means detecting a ventricular event without the atrial detecting means detecting a preceding atrial event during the same cycle; and second means for temporarily raising the detection threshold by a second increment for a second length of time in response to the ventricular detecting means detecting a ventricular event and the atrial detecting means detecting a preceding spontaneous atrial event during the same cycle.