An implantable cardiac stimulation system and method provides an external display of a heart activity signal sensed internally by an implantable cardiac stimulation device which has the appearance of a surface EKG. The heart activity signal is sensed by the implanted device and is processed by the device...http://www.google.com/patents/US7289848?utm_source=gb-gplus-sharePatent US7289848 - Implantable cardiac stimulation device, system and method which provides an electrogram signal having the appearance of a surface electrocardiogram
