ImageReady(TM) MR Conditional Pacing System Clinical Study

Inclusion Criteria: * Subject must have the ImageReady System as their initial (de novo) pacing system implant * Subject has a Class I or II indication for implantation of a single or dual chamber pacemaker according to the ACC/AHA/HRS, or ESC guidelines, as appropriate per geography * Subject is able and willing to undergo an MRI scan without intravenous sedation * Subject is willing and capable of providing informed consent (which can include the use of a legally authorized representative (LAR) for documentation of informed consent) and participating in all testing/ visits associated with this clinical study at an approved clinical study center and at the intervals defined by this protocol * Subject is age 18 or above, or of legal age to give informed consent specific to state and national law Exclusion Criteria: * Subject has or has had any pacing or ICD system implants * Subject has any MR Unsafe implants or devices with an unknown MR status, including MR Unsafe sternal wires, neurostimulators, biostimulator, metals or alloys, per labeling of each implant * Subject has any MR Conditional implants or devices that impact the ability to conduct this protocol * Subject needs or will need another MR scan within 14 weeks of system implant, other than that required by the SAMURAI Study * Subject has a known or suspected sensitivity to dexamethasone acetate (DXA) * Subject has a mechanical tricuspid heart valve * Subject is enrolled in any other concurrent study, with the exception of local mandatory governmental registries and observational studies/registries\* that are not in conflict and do not affect the following: * Schedule of procedures for the SAMURAI Study (i.e. should not cause additional or missed visits); * SAMURAI Study outcome (i.e. involve medications that could affect pacing thresholds); * Conduct of the SAMURAI Study per GCP/ ISO 14155:2011/ local regulations * Subjects with documented permanent or persistent AF where the physician intends to implant a dual chamber pulse generator (single chamber VVIR pulse generators are acceptable) * Subject is currently on the active heart transplant list * Subject has documented life expectancy of less than 12 months * Women of childbearing potential who are or might be pregnant at the time of study enrollment or ImageReady MR Conditional Pacing System implant (method of assessment upon physician's discretion) * Subjects currently requiring dialysis