MRI Compatibility of Pacemakers

Pre-MRI Considerations

The European Society of Cardiology recommends verifying the specific MRI-conditional status of a pacemaker directly with the manufacturer's technical specifications or device manual before proceeding with an MRI scan 1, 2
Conventional pacemakers carry significant risks during MRI, including radiofrequency-induced heating of lead tips, pacing inhibition or dysfunction, and induction of atrial or ventricular tachyarrhythmias, and should not be used without confirmed MRI-conditional status 1, 2, 4

The device must be implanted for at least 6 weeks to ensure lead maturation and position stabilization, as recommended by the European Heart Journal 1, 2, 3
Patients with abandoned or epicardial leads should be excluded from MRI due to the risk of dangerous heating, according to the European Heart Journal 1, 2, 5
Baseline device parameters, including lead impedance, capture threshold, P/R wave amplitude, and battery voltage, should be recorded before MRI, as suggested by the European Heart Journal 1, 2, 5

Qualified personnel must monitor the patient throughout the entire MRI scan with continuous ECG monitoring, as recommended by the European Heart Journal 1, 2
The manufacturer's specific programming instructions should be followed, which typically involve automatic mode switching via external physician-activated device, according to the European Heart Journal 1, 2
For pacemaker-dependent patients, the device should be programmed to asynchronous mode (VOO/DOO) to prevent inappropriate inhibition, as suggested by the European Heart Journal 1, 5
For non-pacemaker-dependent patients, the device should be programmed to inhibited mode (VVI/DDI), according to the European Heart Journal 1, 5

All device variables should be immediately re-checked and compared with baseline measurements after MRI, as recommended by the European Heart Journal 1, 2
The original programming settings should be restored after MRI, according to the European Heart Journal 1, 5

The European Society of Cardiology gives a Class IIb recommendation for performing MRI on conventional pacemakers at 1.5T, indicating a less favorable benefit-risk ratio, and consultation with an electrophysiology specialist is mandatory before proceeding 1, 2
Alternative imaging modalities, such as CT or echocardiography, should be strongly considered before proceeding with MRI on a conventional pacemaker, as suggested by the European Heart Journal 1, 2

Never assume MRI compatibility based on device age or manufacturer alone, and each specific model must be verified, as recommended by the European Heart Journal 1, 2
No data exists for MRI at field strengths >1.5T for most devices, even those labeled MRI-conditional, though some newer systems have 3T data, according to the European Heart Journal 2
The closer the scanning area is to the pacemaker system, the higher the risk of complications, as suggested by the European Heart Journal 2, 5
MRI should not be performed within 6 weeks of implantation due to the risk of lead dislodgement, as recommended by the European Heart Journal 1, 2, 3