Patent ID: 7580740

Claim:
A method for detecting atrial tachyarrhythmia, comprising: detecting a plurality of A-A intervals; selecting A-A intervals from the plurality of A-A intervals based at least in part on one or more events occurring between consecutively sensed atrial depolarizations of the A-A intervals; and using the selected A-A intervals to detect atrial tachyarrhythmia; wherein selecting the A-A intervals comprises: determining if a particular A-A interval is a qualified A-A interval, comprising: determining that the particular A-A interval is a qualified A-A interval if a duration of the particular A-A interval falls outside a predetermined duration range; and determining that the particular A-A interval is a qualified A-A interval based on events occurring between consecutively sensed atrial depolarizations of the particular A-A interval if the duration of the particular A-A interval falls within the predetermined duration range; and wherein using the selected interval comprises using the qualified A-A interval to detect atrial tachyarrhythmia.