Patent ID: 8417335

Claim:
A method of cardiac pacing, comprising: delivering the cardiac pacing using a atrioventricular delay; sensing a refractory atrial event during a post ventricular atrial refractory period (PVARP) of a cardiac cycle; initiating an atrial tachyarrhythmia response interval in response to sensing the refractory atrial event; during the atrial tachyarrhythmia response interval, switching to a selective atrial tracking pacing mode, comprising: determining if an atrial event sensed during the atrial tachyarrhythmia response interval occurs within a predetermined time interval of a cardiac cycle within the atrial tachyarrhythmia response interval; if the sensed atrial event occurs during the atrial tachyarrhythmia response interval and within the predetermined time interval, tracking the sensed atrial event during the cardiac cycle including initiating a shortened atrioventricular delay from the sensed atrial event and pacing the ventricular following expiration of the shortened atrioventricular delay; and if the sensed atrial event occurs during the atrial tachyarrhythmia response interval and before the predetermined time interval, not tracking the atrial event during the cardiac cycle.