Atrial tachyarrhythmia detection using selected atrial intervals
Methods and systems are directed to detecting atrial tachyarrhythmia. A plurality of A-A intervals is detected. The detected A-A intervals are selected and used to detect atrial tachyarrhythmia. Selecting A-A intervals may be based on determining that A-A intervals are qualified. Qualified A-A intervals may be determined if a duration of the particular A-A interval falls outside a predetermined duration range, for example. Qualified A-A intervals may also be determined based on events occurring between consecutively sensed atrial events of the particular A-A interval, and whether the duration of the particular A-A interval falls within the predetermined duration range, for example.
1. 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.
2. The method of claim 1 , wherein the duration range is greater than an atrial tachyarrhythmia response interval and less than twice the atrial tachyarrhythmia response interval.
3. 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 selecting an A-A interval based on a timing of a blanking period relative to a point within the A-A interval.
4. The method of claim 3 , wherein the timing of the blanking period relative to the point within the A-A interval comprises a midpoint of the A-A interval that falls within the blanking period occurring between the consecutively sensed atrial depolarizations of the A-A interval.
5. 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 selecting based on one more criterion of a criteria set, the criteria set comprising:
a first selection criterion related to a timing of a blanking period relative to a point within the A-A interval; and
a second selection criterion specifying that the A-A interval is not interrupted by a ventricular event.
6. 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 using the selected A-A intervals to detect the atrial tachyarrhythmia comprises:
operating a counter using qualified A-A intervals; and
detecting the atrial tachyarrhythmia if the counter reaches a predetermined value.