Patent ID: 6584350
Filing Date: 2003-06-24
Classification: A61N

Abstract:
A method for delivering atrial defibrillation therapy, comprising:detecting an episode of atrial fibrillation or other atrial tachyarrhythmia; detecting ventricular depolarizations (R-waves) with a ventricular sensing channel, wherein R-waves are detected when a sensed ventricular electrogram value exceeds a dynamically varying threshold value; detecting separate events in the ventricular sensing channel with a specified low shock threshold value and a specified high shock threshold value; and, delivering an atrial defibrillation shock pulse synchronously with a detected R-wave when the dynamically varying threshold detects an event, the interval from the last event detected by the low shock threshold to the event presently detected by the low shock threshold or the dynamically varying threshold is greater than a specified minimum shockable time interval, and the high shock threshold also detects an event within a specified maximum time interval from the event detected by the low shock threshold or the dynamically varying threshold.