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Aluminium-containing transdermal patches: a risk of burns.

(1) The waterproof outer layer protecting some transdermal patches is composed of aluminium. This creates a risk of burns, especially when the patient is exposed to electric shocks or intense magnetic fields. (2) External electrical shocks delivered by a defibrillator for example can create electrical arcing between the electrode and the aluminium layer of the patch, potentially causing burns. (3) During Magnetic Resonance Imaging (MRI) the aluminium present in these patches, which is not ferromagnetic, creates electrical resistance (by induction), and can sometimes cause second-degree burns. (4) Patients undergoing MRI or defibrillation should first be examined for patches containing aluminium. Such patches can generally be identified by examining the backing, which is shiny and reflects light if aluminium is present. (5) If in doubt it is best to temporarily remove all transdermal patches before MRI or external defibrillation. (6) Packaging of transdermal patches that contain conductive materials should include more explicit warnings.