A cardiac rhythm management device includes a dual-chamber pacemaker especially designed for treating congestive heart failure and a defibrillator as a back-up measure. The device incorporates a programmed microcontroller which is operative to adjust the AV delay of the pacemaker to a minimum or maximum...http://www.google.ca/patents/US5334222?utm_source=gb-gplus-sharePatent US5334222 - Cardiac stimulating apparatus and method for heart failure therapy
