MRI safe pacemakers?

Published: December, 2006

Researchers at Johns Hopkins Hospital found that 24 models of pacemakers and implanted defibrillators (see table) seemed to be safe for use in a standard MRI machine. Keep in mind that the Hopkins protocol included temporarily reprogramming implanted devices for the duration of the MRI, turning off defibrillators' shock function, reducing the energy of the MRI, continuous monitoring with an electrocardiogram during the scan, and making sure that equipment for restarting the heart and performing CPR were immediately available. This study does not give a green light for MRIs in everyone with a pacemaker or implanted defibrillator.

Pacemakers and defibrillators that satisfactorily underwent MRI testing at Johns Hopkins Hospital


Model name (model number)


St Jude

Pacesetter AFP (262)

Trilogy (2360)

Entity (5326)

Affinity (5130, 5330)

Integrity (5142, 5342, 5346)

Identity (5172, 5370, 5376, 5380, 5386)


Vigor (1232)

Discovery (1272)

Insignia (1194, 1290)


EnPulse (AT-500, E2SRO1, E2DRO1)

Kappa (701, 901)

Prodigy (7860)

In Sync BiV (8040, 8042)


St Jude

Photon (V-194, V-230, V-232)

Atlas (V-240)

Epic (V-197, V-235, V-239)


Prizm (1850, 1851, 1852, 1860, 1861)

Contak (1823, H119, H170, H175)

Vitality (T125, T135)


Maximo (7232)

Gem-II (7273)

Gem-III (7275)

Marquis (7274)

InSync (7272)

To continue reading this article, you must log in.
  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise

New subscriptions to Harvard Health Online are temporarily unavailable. Click the button below to learn about our other subscription offers.

Learn More »