2-4
MRI Scan Procedure Protocol
Pre-Scan Activities
The following features and functions are suspended in MRI Protection Mode:
• PaceSafe RV automatic capture
• PaceSafe RA automatic threshold
• Cardiac sensing
• Daily diagnostics (lead impedance, intrinsic amplitude, pace threshold)
• Motion and respiratory sensors
• Magnet detection
• RF telemetry
• Battery voltage monitoring
The following device conditions will preclude the user from having the option to enter MRI
Protection Mode (see the Reference Guide for the pulse generator for additional information
about these conditions):
• Battery capacity status is Depleted
• Pulse generator is in Storage Mode
• Pulse generator is in Electrocautery Mode
• Pulse generator is in Safety Core operation (Safety Mode)
• Diagnostic test is in progress
• EP test is in progress
WARNING: MRI scanning after Explant status has been reached may lead to premature
battery depletion, a shortened device replacement window, or sudden loss of pacing. After
performing an MRI scan on a device that has reached Explant status, verify pulse generator
function and schedule device replacement.
WARNING: Do not perform an MRI scan on a patient whose device has entered Safety Mode.
Safety Mode pacing is VVI unipolar, which, in the MRI environment, subjects the patient to
increased risk of arrhythmia induction, inappropriate pacing, inhibition of pacing, or irregular
intermittent capture or pacing.
Table 2–1. MRI Protection Parameters
Parameter Programmable Values Nominal
MRI Brady Mode Off; VOO; AOO; DOO DOO for DDD(R), DDI(R), or DOO normal
Brady modes;
VOO for VDD(R), VVI(R), or VOO normal
Brady modes;
AOO for AAI(R) or AOO normal Brady
Mode;
Off for Normal Brady Mode Off
MRI Lower Rate Limit (LRL) ( min
-1
) 30; 35; ...; 100 20 min
-1
above the normal mode LRL
MRI Atrial Amplitude (V) 2.0; 2.1; …; 3.5; 4.0; …; 5.0 5.0 (Tolerance ± 15% or ± 100 mV,
whichever is greater)
a
MRI Ventricular Amplitude (V) 2.0; 2.1; …; 3.5; 4.0; …; 5.0 5.0 (Tolerance ± 15% or ± 100 mV,
whichever is greater)
a
MRI Protection Time-out (hours) Off; 12; 24; 48 24
a. During the transition into the MRI Protection Mode, it may take up to 6 cardiac pacing cycles for the pace amplitude to meet the specified tolerance range.
PRE-SCAN ACTIVITIES
Three activities are required before the MRI scan takes place:
1. Prepare the pulse generator for the scan by programming into MRI Protection Mode ("1.
Programming the Pulse Generator for a Scan" on page 2-5)
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