Technical note: observations of intermittent electromagnetic interference on impedance respiration monitors

The sensitivity of three different types of impedance-respiration recorders (impedance pneumographs) to electromagnetic interference was demonstrated using a dummy subject (loop antenna) and human subjects with transchest electrodes. It was found that the impedance recorders detected electromagnetic energy emitted by sparking thermostat contacts, a soldering gun, a hot-air gun, an electric hair clipper and a fluorescent lamp, all of which were turned on and off to generate the electromagnetic energy.