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Active implantable medical devices, also often referred to as electronic implants, can be generally influenced by electric and magnetic fields. In the case of cardiac implants, e.g. pacemakers and cardioverter defibrillators, any interference can have life-threatening consequences. The probability of interference is mainly determined by the strength of the electric and magnetic fields. For protection of persons carrying pacemakers and implantable cardioverter defibrillators, there exist different standards in Germany which define tests and methods to evaluate the probability of interference. The DIN 50527-2-1, annex F states that "interference between high-voltage power-lines and pacemakers can be excluded for most of the used sensitivity settings, with the exception of unipolar pacemakers with the most sensitive settings". However, unipolar systems are not used anymore today. This result has been confirmed by research on pacemakers and implantable defibrillators at the Research Center for Bioelectromagnetic Interaction (femu) of the RWTH Aachen. Femu offers interested implant users an examination into the interference resistance of their devices against electric and magnetic fields.