Patent ID: 8396553

Claim:
A medical device, comprising: a plurality of electrodes sensing cardiac signals; and a microprocessor operably coupled to the plurality of electrodes and configured to determine a cumulative atrioventricular interval (AVI) burden in response to the sensed cardiac signals, and, in response to the determined cumulative AVI burden, to switch operation of the device between a minimal biventricular pacing (MBVP) mode, wherein the MBVP mode comprises scheduling delivery of biventricular pacing in a subsequent cardiac cycle in response to detecting absence of an intrinsic ventricular depolarization in a current cardiac cycle, and a conditional triple chamber pacing (CTCP) mode, wherein the CTCP mode comprises delivering biventricular pacing in the current cardiac cycle in response to detecting an absence of the intrinsic ventricular depolarization in the current cardiac cycle, wherein the cumulative AVI burden comprises a measure of a proportion of atrioventricular intervals exceeding a predetermined threshold.