Patent ID: 8649853

Claim:
A system comprising: an implantable medical device (IMD) including: a receiver circuit, configured to be electrically coupled to a conductor comprising a portion of an implantable lead, the receiver circuit configured to receive a response to an excitation signal applied to the conductor of the lead, the response modulated according to a change in an electrical characteristic of at least one conductor in the lead to provide information indicative of a movement of the implantable lead due at least in part to a motion of a heart; and a sensing circuit configured to obtain information indicative of cardiac electrical activity; and a processor circuit configured to construct a template representative of a contraction of the heart, the template constructed using the information indicative of the movement of the implantable lead due at least in part to the motion of the heart during the contraction, and using the information indicative of cardiac electrical activity sensed during the contraction.