- any contraindication to magnetic resonance imaging: electronically, magnetically and mechanically activated implants such as cardiac pacemakers, automatic cardioverter defibrillators, joint prostheses, surgical/vascular clips/ hearing aids, neurostimulators, infusion pumps etc metallic splinters in the eye ferromagnetic haemostatic clips in the central nervous system cochlear implants lead wires or similar wires prosthetic heart valves, if dehiscence is suspected non-ferromagnetic stapedial implants, hemostatic clips