Automatic thresholds for atrial tachyarrhythmia detection in an implantable medical device

A medical device system for detecting an atrial tachyarrhythmia episode, comprising:

• sensing circuitry configured to receive a cardiac electrical signal from a plurality of electrodes coupled to the sensing circuitry;
• and
• a processor configured to:
• detect a first atrial tachyarrhythmia episode in response to a time duration of the cardiac electrical signal classified as an atrial tachyarrhythmia being greater than or equal to a first detection threshold;
• determine if detection threshold adjustment criteria are met based on at least the detected first atrial tachyarrhythmia episode;
• and
• adjust the first detection threshold to a second detection threshold different than the first detection threshold in response to the detection threshold adjustment criteria being met.

A non-transitory, computer-readable storage medium storing instructions for causing a processor included in a medical device to perform a method for detecting an atrial tachyarrhythmia episode, the method comprising:

• receiving a cardiac electrical signal via a plurality of electrodes coupled to sensing circuitry of the medical device;
• detecting a first atrial tachyarrhythmia episode in response to a time duration of the cardiac electrical signal classified as an atrial tachyarrhythmia being greater than or equal to a first detection threshold;
• determining if detection threshold adjustment criteria are met based on at least the detected first atrial tachyarrhythmia episode;
• and
• adjusting the first detection threshold to a second detection threshold different than the first detection threshold in response to the detection threshold adjustment criteria being met.