A system for artificial stimulation of the heart of a subject is provided, the system comprising a controller comprising a receiver for receiving signal data, a processor for processing received signal data, and a transmitter for transmitting signal data； a sensing stent for location in the proximal coronary sinus of the subject, the sensing stent electrode comprising a sensing electrode assembly for sensing atrial and/or ventricular signals from the heart of the subject and a transmitting assembly for transmitting signal data to the receiver of the controller； and a stimulation stent for location in a vein of the subject distal of the sensing stent, the stimulation stent comprising a receiver for receiving signal data from the transmitter of the controller and an electrode assembly for providing a stimulating electrical signal to the heart of the subject in response to the data received.
