Patent ID: 7567835

Claim:
A method of detecting an occurrence of intrinsic depolarizations of a heart chamber comprising: obtaining a far-field electrogram (FF EGM) signal comprising a stream of digital sample points; identifying possible intrinsic depolarizations by applying amplitude change criteria to subsets of the stream of digital sample points, the subsets comprising at least 3 digital sample points within the stream; removing, from the identified possible intrinsic depolarizations, possible intrinsic depolarizations that have amplitudes below an amplitude threshold criterion to generate first updated identified possible intrinsic depolarizations; then removing, from the first updated identified possible intrinsic depolarizations, possible intrinsic depolarizations that occur within a blanking interval period immediately after a preceding intrinsic depolarization to generate second updated identified possible depolarizations; and marking the second updated identified possible intrinsic depolarizations as sensed events from the FF EGM signal.