Magnetic resonance imaging: contraindications and safety
The magnet is always on. Everything that enters the room stays under its influence, including during a resuscitation. This is why the safety check happens before the door, not inside it. Ask about, and document: cardiac pacemaker or defibrillator, cochlear implant, neurostimulator, infusion pump, aneurysm clips, metallic foreign body in the eye, and any recent surgery involving an implant. Many modern devices are conditionally compatible, but compatibility must be verified against the device, not assumed. Before entering: remove all metal, including jewellery, hairpins, hearing aids, dentures with metal parts, medication patches with a metallic backing, and monitoring leads. Verify the pockets. The examination is long, loud and enclosed. Claustrophobia is a real reason for an incomplete examination; naming it in advance allows the team to plan hearing protection, a mirror, a companion in the room or an anxiolytic prescribed for the occasion. Gadolinium contrast is not iodinated contrast, but it also requires a known kidney function before administration.