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European standards specify that pacemakers (PM) should be resistant to electromagnetic interference (EMI) up to an upper borderline voltage as a function of frequency. Electromagnetic interference fields should either remain below this upper borderline voltage level or be identified and isolated from the general population. Physicians caring for PM patients need to be aware of potential problems relating to EMI. For example, sensitivity should be programmed to avoid sensing EMI below the recommended borderline voltage level. The susceptibility of a pacemaker (PM) to 50 Hz noise is an important parameter of EMI and depends on the programmed sensitivity [sensitivity setting (SS)]. We studied SS and 50 Hz noise thresholds in a large population and determined the borderline SS, defined as the SS below which 50 Hz noise was sensed. Our results should be taken into consideration in programming the SS to protect patients from the adverse effects of EMI.

Pacemaker sensitivity to 50 Hz noise voltages