CPC A61B 5/363 (2021.01) [A61B 5/361 (2021.01); A61B 5/686 (2013.01); A61N 1/3622 (2013.01); A61N 1/3956 (2013.01); A61B 5/0031 (2013.01); A61B 5/287 (2021.01); A61B 5/316 (2021.01); A61B 5/352 (2021.01); A61B 5/7264 (2013.01); A61N 1/3624 (2013.01)] | 21 Claims |
1. A medical device, comprising:
a sensor configured to sense a cardiac mechanical signal;
a cardiac electrical signal sensing circuit configured to sense ventricular events;
a pulse generator configured to generate ventricular pacing pulses; and
a control circuit coupled to the sensor, the sensing circuit, and the pulse generator, the control circuit configured to:
identify a plurality of ventricular events comprising the ventricular pacing pulses delivered by the pulse generator and ventricular events sensed by the cardiac electrical signal sensing circuit;
determine a first atrial arrhythmia score from the identified plurality of ventricular events;
determine a second atrial arrhythmia score from the cardiac mechanical signal by:
determining ventricular cycle lengths between the identified plurality of ventricular events;
sensing atrial events from the cardiac mechanical signal;
determining a count of the ventricular cycle lengths that include exactly one sensed atrial event during the respective ventricular cycle length; and
determining the second atrial arrhythmia score based on the determined count;
determine a percentage of the identified plurality of ventricular events that are ventricular pacing pulses;
determine that the percentage of the identified plurality of ventricular events that are ventricular pacing pulses is greater than a threshold percentage;
determine that atrial arrhythmia criteria are met based on the first atrial arrhythmia score and the second atrial arrhythmia score; and
in response to the percentage of the identified plurality of ventricular events that are ventricular pacing pulses being greater than the threshold percentage, withhold a detection of atrial arrhythmia when the atrial arrhythmia criteria are met based on the first atrial arrhythmia score and the second atrial arrhythmia score.
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