Objective To investigate the efficacy and safety of the Medtronic magnetic resonance imaging(MRI)–conditional pacemaker system. Methods A3 DR01 was implanted in the study group,and patients who implanted the non-MRI conditional double pacemaker in the same time were enrolled in the control group.The success rates,procedure time,fluoroscopic time and complications were assessed.Evaluation of the pacemaker function was performed before and after MRI scan.MRI-related complication was evaluated. Results Fifty p...