SAVEPACe - Search AV Extension and Managed Ventricular Pacing for Promoting Atrio-Ventricular Conduction

Inclusion Criteria: * 18 years of age and older * Willing and able to give informed consent * Willing and able to comply with the study follow-up schedule * Class I/ClassII indications for dual chamber pacing * Initial implant of a Kappa 700, Kappa 900, EnPulse, or EnRhythm dual chamber IPG * Demonstrate 1 to 1 conduction and a QRS interval of \< 120ms at 100 beats per minutes for a period of nine seconds while atrial pacing Exclusion Criteria: * Less than 18 years of age * Unwilling or unable to give informed consent * Unwilling or unable to commit to follow-up schedule * Medical conditions that would preclude the testing required by the protocol or limit study participation * Enrolled or intend to participate in another clinical trial during the course of this study * A life expectancy of less than 2 years * History of continuous atrial fibrillation for the 6 months prior to screen visit * Two or more cardioversions, chemical or electrical, within the past 6 months prior to screen * History of persistent second or third degree atrioventricular block * A prior implant of pacemaker or defibrillator device * A baseline, pre-paced QRS \>120 ms on surface ECG * Failure of the 1 to 1 atrioventricular conduction test * Anticipated major cardiac surgery within the course of the study