Disturbances of heart rhythm produced by 50 Hz leakage currents in dogs.

In healthy dogs and in dogs with experimental myocardial infarct, the smallest current applied through a pacing wire which would produce a disturbance in rhythm was 60 μA. This figure is higher than most recommended standards for earth-free monitoring equipment. Much bigger currents were required to produce a disturbance from a wire in the right atrium, which appears to be a safe location for catheters and pacing wires.