If the blocker installed in the heart is made of nickel-titanium alloy, it is possible to do magnetic resonance, and it is recommended to choose the magnetic resonance below 3.0T. However, if it is made of other metal components, it is necessary to consult with the doctor further to see if it is possible to do magnetic resonance examination. In recent years, most of the materials used in heart block surgery are nickel-titanium alloy or ceramic materials. According to the research of the American Heart Association, as long as they are made of these two materials, patients can undergo magnetic resonance examination. However, for safety reasons, it is recommended that the MRI be performed six months after the surgery. It is safer to choose an MRI of less than 3.0T, as the examination will not cause the device to shift. Since the materials of different manufacturers are not exactly the same, if the material of the blocking material is not clear, it is recommended to consult with the surgeon whether the MRI examination can be performed.