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Interference is defined as disturbance generated by an external source that potentially affects the functioning of cardiac implantable electronic devices (CIEDs)—ie cardiac pacemakers (PMs), implantable cardioverter defibrillators (ICDs), cardiac resynchronization therapy (CRT) devices, and implantable loop recorders (ILRs). 1 Energy forms such as radiation, magnetic or electromagnetic fields (EMFs), as well as acoustic signals potentially cause interference due to oversensing (ie signals that are sensed by the device that do not reflect myocardial depolarization) and subsequently temporary suppression or inappropriate delivery of device therapy, programming errors (device reset), or even permanent CIED malfunction (Table 2).