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January 6, 1989

Cochlear Implants Are a Contraindication to MRI

Author Affiliations

Stanford (Calif) University School of Medicine

Stanford (Calif) University School of Medicine

JAMA. 1989;261(1):46. doi:10.1001/jama.1989.03420010056027

To the Editor. —  The National Institutes of Health Consensus Conference report on magnetic resonance imaging1 failed to mention cochlear implants as a contraindication. Since these devices employ a high-strength cobalt samarium magnet that works in conjunction with an external magnet to align and retain a radio frequency transmitter coil on a patient's head, the labeling of the devices, approved by the Food and Drug Administration, includes a specific warning against magnetic resonance imaging; physicians should be aware of this contraindication.