<qa>  What is a tendency of claustrophobia?21. Had or have an aneurysm clip implanted, intraocular foreign bodies commonly seen in welders, subcutaneous metal shards found in sheet metal workers, or some shrapnel; additionally no cardiac pacemaker, defibrillator, implanted neurostimulater TENS implants some prosthetic heart valve especially mitral valve, cochlear implant or other hearing aide, or has a tendency of claustrophobia. Tattoos that may contain iron-based dyes. 