Abstract: The present invention is a heart stimulation medical device that is electrically self-sustaining. The present invention uses the patient's body as a battery or source of electric current. The device relates to the functions of a pacemaker and detecting and/or treating cardiac arrest. The present invention may be characterized as at least including a heart sensor for detecting a heartbeat of the patient and for generating a heartbeat signal; a processor for receiving the heart beat signal and for transitioning the medical device between an active state and an inactive state; an electrical pulse output that is electrically connectible to a portion of the patient's heart; and a power harvester that is adapted to harvest electric current from the patient's body and the power harvester is electrically connected to at least the pulse output and the processor so that the medical device is electrically self-sustaining when in an active state.