Do transdermal patches pose a risk during MRI?
Transdermal patches may cause skin burns during an MRI scan if they have an aluminium backing or contain other metals.1,2 The metallic component may not be visible, and not all product labels contain a warning about the risk of burns. Patches that contain non-ferrous metals, such as aluminium, can create electrical resistance leading to excessive heating and tissue damage. A shiny backing layer that reflects light generally indicates the presence of aluminium,3 however some patches that appear to be made solely from plastic may contain metal ions.4 If it is unclear whether the patch has any metal components, it should not be worn during the procedure. When referring for an MRI scan, ask all patients if they use any prescription or over-the-counter transdermal patches.5 Give specific examples if necessary (e.g. glyceryl trinitrate patches, nicotine patches). Those using a metal-containing patch should be told to remove it before the scan, and to have a replacement patch ready to apply a
