 The COMPARE-Adapta study is a randomized, multi-center, prospective study conducted in China. The purpose of the study is to compare the ability of Search AVTM and Managed Ventricular Pacing MVP to reduce ventricular pacing in dual chamber pacemaker-indicated patients. The COMPARE-Adapta study will also observe atrial fibrillation AF burden as demonstrated by Cardiac Compass and the clinical profile Adapta pacemaker patients. 