Here is an essential text for cardiologists, heart surgeons, intensive care specialists and anyone interested in pacing. It is a comprehensive guide to contemporary devices used in the resynchronization of patients’ heartbeats. The treatment of congestive heart failure by implanted biventricular pacemakers, or cardiac resynchronization, has revolutionized the practice of implanting pacemakers and defibrillators. More cardiac resynchronization therapy devices than conventional pacemakers are now being implanted and the numbers are growing worldwide.