Patent ID: 8886312

Claim:
A system comprising: a first cardiac signal sensing circuit configured to sense a first cardiac signal segment using a first set of electrodes connectable to the first cardiac signal sensing circuit, wherein the first cardiac signal segment is sensed over a cardiac cycle; a processor circuit communicatively coupled to the first cardiac signal sensing circuit, wherein the processor circuit includes a peak detector circuit configured to: identify, in the first cardiac signal segment, a maximum peak of a cardiac cycle of the first cardiac signal segment, identify, within the same cardiac cycle, a first positive or negative peak having an amplitude that is greater than a specified percentage of the identified maximum peak, and indicate the identified positive or negative peak as a fiducial indicative of ventricular activation that is local to at least one electrode of the first set of electrodes, wherein the processor circuit is configured to provide an indication of local ventricular activation to at least one of a user or process.