A pacemaker which is provided with an improved automatic regulation circuit which is capable of distinguishing between a fashion beat and loss of capture. The failure to sense an evoked potential following a stimulus may be due to either. The cause is determined by generating a high-energy back-up pulse...http://www.google.com/patents/US4969467?utm_source=gb-gplus-sharePatent US4969467 - Pacemaker with improved automatic output regulation
