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Contraindications

The most important absolute contraindications for undergoing an MRI exam include the following:

  • Cardiac Pacemaker
  • AICDs (defibrillators)
  • Neurostimulators

Patients with these devices CANNOT undergo an MRI exam.

Other metal objects that are of concern include:

  • Prosthetic valves, in particular old St. Jude prosthetic valves
  • Aneurysm clips, plates, screws, or shunts
  • Possible exposure to metal in your eyes (welding or machining)
  • Ear implants, particularly cochlear implants
  • Prior cardiac or vascular surgery involving metal stents
  • Devices for pain control (tens unit) or nerve stimulator
  • Artificial joints, pins or rods within bone
  • Bullets or shrapnel
  • Intra-uterine devices (IUD)

Other issues of relevance include pregnant patients and patients with claustrophobia. Pregnant patients will have to sign a consent, as the effects of MRI on pregnancy are not known. Patients with claustrophobia will need a prescription for sedation (Valium 10 mg) and will need to arrange for someone to drive them home following the procedure.