An implantable device for providing pacing and defibrillating stimuli to a heart, comprises: a power source, at least one electrode electrically connected to said power source, a sensor capable of providing data that can be used to determine a physiological pacing demand, and a control device. The control...http://www.google.de/patents/US5861009?utm_source=gb-gplus-sharePatent US5861009 - Implantable cardiac stimulator with rate-adaptive T-wave detection
