Patent ID: 7113823

Claim:
A method for operating a cardiac rhythm management device in a patient, comprising: delivering paces to both right and left ventricles in accordance with a programmed biventricular pacing mode, such that the paces are delivered at a programmed biventricular offset interval and after a programmed AV delay interval with respect to an atrial event; switching to LV-only pacing mode and recording an evoked response test electrogram during an LV-only pace with the programmed AV delay interval; comparing the test electrogram to an evoked response template electrogram previously recorded during LV-only pacing when the programmed AV delay interval was known to be matched to the patient's then existing intrinsic AV interval; adjusting the programmed AV delay interval to match the patient's current intrinsic AV interval based upon the comparison of the test and template electrograms; returning to the biventricular pacing mode with the adjusted AV delay interval.