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MRI Scan Procedure Protocol
1. Programming the Pulse Generator for a Scan
WARNING: Use caution when programming the MRI Protection Mode pacing amplitude for
pacing-dependent patients who have high pacing thresholds (> 2.0 V). Programming pacing
amplitude below 5.0 V is provided as an option in case of extracardiac stimulation (for example,
diaphragmatic stimulation for RV pacing). If pacing amplitude is programmed below 5.0 V, an
appropriate safety margin (2X the pacing threshold + 1.0 V) should be maintained. An inadequate
safety margin may result in loss of capture.
Figure 2–6. Pacing threshold greater than 2.0 V attention message
Pacing Lead Configuration
Upon programming parameters for MRI Protection Mode, the device also checks the pacing lead
configuration to confirm that it is bipolar in chambers where pacing will occur in MRI Protection
Mode. If the lead(s) to be used for pacing while in MRI Protection Mode are programmed to a
unipolar pacing configuration, entry into MRI Protection Mode is denied, since the device does
not meet the Condition of Use related to bipolar pacing (see Table 1–4 Cardiology Conditions/
Patient Conditions on page 1-6). In order to proceed, program any lead that will be used to pace
in the MRI Protection Mode to bipolar or choose a pacing mode of Off.
If threshold tests are within range and the pacing configuration is bipolar in chambers where
pacing will occur in MRI Protection Mode, or if the user elects to continue with MRI Protection
Mode after reviewing the risks of proceeding in the presence of pacing thresholds greater than
2.0 V, the following screen appears, indicating that the device has successfully been
programmed into MRI Protection Mode at the settings indicated (Figure 2–7 MRI Protection
Mode Programmed dialog on page 2-10).
Figure 2–7. MRI Protection Mode Programmed dialog
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