Patent ID: 8175707

Claim:
A method implemented by an implantable cardiac resynchronization therapy device, the method comprising: delivering a cardiac resynchronization therapy that comprises an atrio-ventricular delay and an interventricular delay; monitoring patient activity level; optimizing the atrio-ventricular delay and the interventricular delay for a plurality of patient activity levels including a rest state to generate a plurality of optimal atrio-ventricular delays and a plurality of optimal interventricular delays, each atrio-ventricular delay and each interventricular delay corresponding to a unique activity level; storing the optimal atrio-ventricular delays and the optimal interventricular delays in association with the corresponding patient activity levels; detecting a change in patient activity level including a change to the rest state; adjusting an atrial pacing rate in response to the detected change in patient activity level based at least in part on a heart failure status; and automatically adjusting the atrio-ventricular delay and the interventricular delay, in response to the detected change in patient activity level including to the rest state, wherein the adjusting comprises using a stored optimal atrio-ventricular delay that corresponds to the patient activity level and a stored optimal interventricular delay that corresponds to the patient activity level.