In an implantable heart-monitoring device and system, and a heart-monitoring method, a control circuit is connected to one or more sensors, a first of which is positionable in the coronary sinus region of a heart and senses at least one blood constituent, and at least one other of the sensors supplying...http://www.google.co.uk/patents/US7389142?utm_source=gb-gplus-sharePatent US7389142 - Heart monitoring device, system and method
