Patent ID: 8126552

Claim:
A method comprising: delivering a cardiac pacing therapy that comprises an atrio-ventricular delay (AV or PV) and an interventricular delay (VV); providing a paced propagation delay (PPD) associated with delivery of a stimulus to a ventricle; delivering a stimulus to the ventricle; sensing an event in the other ventricle caused by the stimulus; determining an interventricular conduction delay (IVCD) based on the delivering and the sensing; determining an interventricular delay (Δ sur ) based on the interventricular conduction delay (IVCD) and the paced propagation delay (PPD); and determining one or more cardiac pacing therapy parameters based at least in part on the interventricular delay (Δ sur ) wherein the paced propagation delay (PPD) is a travel time for a wavefront measured from a delivery time of a stimulus to a ventricle to a feature of an evoked response to the stimulus in the ventricle.