Micra VR
Model MC1VR01 | Medtronic, Inc. | Leadless pacemaker
Models with the same MRI conditions
MC1VR01
The MRI conditions shown are based on the manufacturer's official guidelines.
Do not apply them to models not listed above; search for that model separately. Search models →
MR Conditional
Important alert
- Do not scan patients with a Micra device implanted in a location other than the right ventricle.
- Do not scan patients with abandoned leads.
- Do not scan patients with programmed outputs > 4.5 V.
- Do not scan patients who exhibit diaphragmatic stimulation when the device is pacing asynchronously during the MRI SureScan mode.
1Pre-scan checks
- Do not scan patients with a Micra device implanted in a location other than the right ventricle.
- No abandoned leads are present.
- Do not scan a patient who has an active Micra device without first programming MRI SureScan to On. The SureScan device that is beyond its projected service life is programmed to Device Off.
2MRI scan conditions
1.5 T
| Scanner type | Horizontal field, cylindrical bore, clinical system |
|---|---|
| Spatial gradient | a maximum spatial gradient of ≤ 25 T/m ( 2500 gauss/cm ) |
| Gradient slew rate | Gradient systems with maximum gradient slew rate performance per axis of ≤ 200 Tesla per meter per second (T/m/s) |
| Whole-body SAR | The whole body averaged specific absorption rate (SAR) must be ≤ 4.0 W per kilogram (W/kg). |
| Head SAR | The head SAR must be ≤ 3.2 W/kg. |
| Scan region / position conditions | Patient positioning – There are no patient positioning restrictions relative to the MRI isocenter landmark. |
3.0 T
| Scanner type | Horizontal field, cylindrical bore, clinical system |
|---|---|
| Spatial gradient | a maximum spatial gradient of ≤ 25 T/m ( 2500 gauss/cm ) |
| Gradient slew rate | Gradient systems with maximum gradient slew rate performance per axis of ≤ 200 Tesla per meter per second (T/m/s) |
| Whole-body SAR | The whole body averaged specific absorption rate (SAR) must be ≤ 4.0 W per kilogram (W/kg). |
| Head SAR | The head SAR must be ≤ 3.2 W/kg. |
| Scan region / position conditions | Patient positioning – There are no patient positioning restrictions relative to the MRI isocenter landmark. |
3RF COIL / RF excitation
| RF coil | Use of transmit/receive and receive-only coils – There are no restrictions on the use of local transmit/receive coils for MRI scanning of the head or of the extremities, and there are no restrictions on the placement of receive-only coils. |
|---|
4Monitoring & emergency response
- Proper patient monitoring must be provided during the MRI scan. This includes continuous monitoring of the patient’s hemodynamic function.
- Maintaining continuous visual and verbal contact with the patient.
- Continuous monitoring of the patient’s heart rate using instrumentation such as pulse oximetry (plethysmography) or electrocardiography.
- In the event that patient rescue is required, an external defibrillator must be available during the MRI scan.
- If the patient’s hemodynamic function is compromised during the MRI scan, discontinue the scan, remove the patient from the magnet room, program MRI SureScan to Off, and take the proper measures to restore the patient’s hemodynamic function.
- Monitoring is required whether the device is active, or if the device is programmed to Device Off.
5Post-scan checks
- Do not leave the device in MRI SureScan mode after the scan is complete. Be sure to program MRI SureScan to Off as soon as the scan is complete.
- The device automatically programs MRI SureScan to Off 24 hours after it is programmed to On.
6Other information
- Scanning patients who have multiple MR Conditional devices present is acceptable as long as the MR labeling conditions for all implanted devices can be satisfied.
- Do not bring the Medtronic programmer into the examination room (magnet room). It is MR Unsafe.
- Image artifact and distortion resulting from the presence of the device within the field of view must be considered when selecting the field of view and imaging parameters. These factors must also be considered when interpreting the MRI images.
- It is not recommended to perform MRI scans during the implant maturation period because MRI scans during this period have not been prospectively studied by Medtronic.
- Micra devices can be safely scanned if the device is programmed to Device Off, or if the device has reached End of Service (EOS).
- Scanning patients who have multiple MR Conditional Micra devices is also acceptable when the MR labeling conditions for Micra are satisfied.
These conditions are based on the source document shown below (revision and date). Before scanning, verify the patient's complete system (device, leads, and any other implants) against the latest manufacturer labeling.