Patent ID: 6865414

Claim:
A method for use in a cardiac stimulation device to differentiate between sinus events and ectopic events, comprising: sensing sinus events and ectopic events; automatically determining sensing thresholds of the sinus events; automatically determining sensing thresholds of the ectopic events; storing the sensing thresholds of the sinus events, the sensing thresholds of the ectopic events, and timing relationships that define sinus intervals and ectopic intervals; classifying a sensed cardiac event as a sinus event or an ectopic event based on the proximity of an amplitude of the cardiac event to any of the sensing thresholds of the sinus events or the sensing thresholds of the ectopic events; and classifying a sensed cardiac event as a sinus event or an ectopic event based on the proximity of the sensed cardiac event to a previous average cycle length in a corresponding cardiac chamber.