Patients who are not pacemaker dependent will have their pacemaker/ICD programmed to AAI/VVI/DDI at 40 beats per minute for the duration of the MRI. Patients who are pacemaker dependent (pacing at programmed lower rate during the pre-scan interrogation) will have their pacemaker/ICD programmed to AOO/VOO/DOO at the programmed lower rate for the duration of the MRI. Emergency equipment, including a MRI compatible defibrillator and transcutaneous pacemaker, will be available throughout the procedure in the event of an adverse clinical event. In addition to radiology staff, a pacemaker technologist or manufacturer clinical representative and an EP tech/RN with current ACLS will be present for the duration of the procedure. An EP physician/advanced practice provider (APP) must be immediately available (i.e., in the hospital) to provide medical intervention, such as placement of a temporary external pacemaker if required. In the event that a code is called by the MRI staff, hospital protocol indicates that ER staff will respond to the code.